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Sample records for asphalt pavements

  1. Asphalt in Pavement Maintenance.

    Science.gov (United States)

    Asphalt Inst., College Park, MD.

    Maintenance methods that can be used equally well in all regions of the country have been developed for the use of asphalt in pavement maintenance. Specific information covering methods, equipment and terminology that applies to the use of asphalt in the maintenance of all types of pavement structures, including shoulders, is provided. In many…

  2. USE OF RECLAIMED ASPHALT PAVEMENT WITH MILLED ROAD PAVEMENT LAYERS

    OpenAIRE

    Andrzej Plewa; Marta Wasilewska; Władysław Gardziejczyk; Paweł Gierasimiuk

    2015-01-01

    The article presents the results of research on the functional properties of asphalt mixes using RAP obtained from milling asphalt road pavements. Asphalt concrete AC 22P with 0%, 10%, 15% and 20% addition of RAP used for base course of road pavements were designed. It was found that asphalt mixes with RAP characterized by comparable and in some cases better functional properties compared to the asphalt mixes without RAP (0%). One should notice the influence of RAP on the performance and ...

  3. Asphalt for draining pavement; Haisuisei hosoyo asphalt

    Energy Technology Data Exchange (ETDEWEB)

    Yamamori, H.; Nakamura, Y. [Mitsubishi Oil Co. Ltd., Tokyo (Japan)

    1994-12-28

    The effect and functions of draining pavement with a superb performance as a paved road were introduced. In the draining pavement, a porous asphalt mixture was used for the surface and base layers of the road and the remaining layers are not in water penetration property. It is necessary that void continues to prevent water film from being generated when rain falls and resistance against water flow is small but durability has problems when the void rate is large. According to the balance, the void rate ranges from 20 to 23 % for execution, thus preventing water splash on a rainy day, hydroplaning, and dazzlement, etc. due to reflection of light. The noise during driving due to the tire of an automobile is reduced by 5 to 6 dB owing to draining pavement. Also, engine noise is reduced to 40 - 60 % since the surface is porous. In the draining pavement, a high-viscosity asphalt is used for a binder and the void rate is large, thus preventing temperature to rise easily due to heat release and achieving an improved flow behavior. 6 refs., 11 figs., 14 tabs.

  4. USE OF RECLAIMED ASPHALT PAVEMENT WITH MILLED ROAD PAVEMENT LAYERS

    Directory of Open Access Journals (Sweden)

    Andrzej Plewa

    2015-07-01

    Full Text Available The article presents the results of research on the functional properties of asphalt mixes using RAP obtained from milling asphalt road pavements. Asphalt concrete AC 22P with 0%, 10%, 15% and 20% addition of RAP used for base course of road pavements were designed. It was found that asphalt mixes with RAP characterized by comparable and in some cases better functional properties compared to the asphalt mixes without RAP (0%. One should notice the influence of RAP on the performance and durability of the asphalt mixtures, as compared to virgin asphalt mixtures (without RAP.

  5. Modeling Recycling Asphalt Pavement Processing Technologies in Asphalt Mixing Plants

    OpenAIRE

    Simonas Tamaliūnas; Henrikas Sivilevičius

    2011-01-01

    The article presents reclaimed asphalt pavement (RAP) processing technologies and equipment models used in the asphalt mixing plant (AMP). The schematic model indicating all possible ways to process RAP in AMP is shown. The model calculating the needed temperature of mineral materials used for heating RAP is given and an example of such calculation is provided.Article in Lithuanian

  6. Modeling Recycling Asphalt Pavement Processing Technologies in Asphalt Mixing Plants

    Directory of Open Access Journals (Sweden)

    Simonas Tamaliūnas

    2011-04-01

    Full Text Available The article presents reclaimed asphalt pavement (RAP processing technologies and equipment models used in the asphalt mixing plant (AMP. The schematic model indicating all possible ways to process RAP in AMP is shown. The model calculating the needed temperature of mineral materials used for heating RAP is given and an example of such calculation is provided.Article in Lithuanian

  7. Porous Flame-retarded Asphalt Pavement for Highway Tunnel

    Institute of Scientific and Technical Information of China (English)

    HU Shuguang; HUANG Shaolong; Ding Qingjun

    2008-01-01

    A new way to improve the tunnel fire protection by using flame-retarded porous asphalt pavement containing ATH powders was introduced. Based on the miniature burning test designed and conducted, the burning time and temperature of porous asphalt (PA) and flame-retarded porous asphalt (FRPA) were studied comparing with cement concrete pavement, dense-graded HMA and S MA. Results of burning test and pavement performance test indicate that FRPA is appropriate and suitable as the pavement material of highway tunnel.

  8. The improvement of pavement performance using asphalt rubber hot mixes

    OpenAIRE

    Pais, Jorge C.; Pereira, Paulo A. A.

    2007-01-01

    The need of a better pavement performance has led researchers to develop new road materials, mainly for the asphalt layers, where the modification of the asphalt is the main example. This modification usually forces the use of polymers and fibers and, more recently, the use of crumb rubber from ground tires, where the modified asphalt is known as asphalt rubber. This asphalt rubber used in asphalt mixtures produces a superior performance if compared to the asphalt mixtures with...

  9. Full-Depth Asphalt Pavements for Parking Lots and Driveways.

    Science.gov (United States)

    Asphalt Inst., College Park, MD.

    The latest information for designing full-depth asphalt pavements for parking lots and driveways is covered in relationship to the continued increase in vehicle registration. It is based on The Asphalt Institute's Thickness Design Manual, Series No. 1 (MS-1), Seventh Edition, which covers all aspects of asphalt pavement thickness design in detail,…

  10. Full-Scale Accelerated Pavement Testing of Warm-Mix Asphalt (WMA) for Airfield Pavements

    Science.gov (United States)

    2014-01-01

    ER D C/ G SL T R -1 4 -3 Full-Scale Accelerated Pavement Testing of Warm-Mix Asphalt (WMA) for Airfield Pavements G eo te ch n ic al...2014 Full-Scale Accelerated Pavement Testing of Warm-Mix Asphalt (WMA) for Airfield Pavements Mariely Mejías-Santiago, Jesse D. Doyle, and John F... asphalt (WMA) mixtures designed for airfield pavements. Three WMA mixtures were evaluated and compared to a control hot-mix asphalt (HMA) mixture. Data

  11. Research on Alkaline Filler Flame-Retarded Asphalt Pavement

    Institute of Scientific and Technical Information of China (English)

    HU Shuguang; ZHANG Houji; WANG Jiaolan

    2006-01-01

    Used as flame retardant of tunnel asphalt pavement, organic bromides produce a large amount of poisons and smoke in construction and flame retardation stage. The alkaline filler was found to replace mineral filler, and the flame-retarded asphalt mixtures were produced. Experimental results show that these asphalt mixtures are smoke restrained; the performances and construction technology of asphalt pavement are not influenced; also the alkaline filler is of low-price. So this kind of flame-retarded asphalt mixtures is suitable for tunnel pavement.

  12. Effects of reclaimed asphalt pavement on indirect tensile strength test of conditioned foamed asphalt mix

    Science.gov (United States)

    Yati Katman, Herda; Rasdan Ibrahim, Mohd; Yazip Matori, Mohd; Norhisham, Shuhairy; Ismail, Norlela

    2013-06-01

    This paper presents the results of Indirect Tensile Strength (ITS) Test for samples prepared with reclaimed asphalt pavement (RAP). Samples were conditioned in water at 25°C for 24 hours prior to testing. Results show that recycled aggregate from reclaimed asphalt pavement performs as well as virgin aggregate.

  13. Mechanical Properties of Asphalt Pavement Structure in Highway Tunnel

    Institute of Scientific and Technical Information of China (English)

    SHI Chun-xiang; GUO Zhong-yin

    2008-01-01

    A linear full 3D finite element method (FEM) was performed in order to present the key design parameters of highway tunnel asphalt pavement under double-wheel load on rectangular loaded area considering horizontal contact stress induced by the acceleration/deceleration of vehicles. The key design parameters are the maximum horizontal tensile stresses at the surface of the asphalt layer, the maximum horizontal tensile stresses at the bottom of the asphalt layer and the maximum vertical shear stresses at the surface of the as- phalt layer were calculated. The influencing factors such as double-wheel weight; asphalt layer thickness; base course stiffness modulus and thickness; and the contact conditions among the structure layers on these key design parameters were also examined separately to propose construction procedures of highway tunnel asphalt pavement.

  14. Detection of asphalt pavement cracks using remote sensing techniques

    Science.gov (United States)

    Mettas, Christodoulos; Agapiou, Athos; Themistocleous, Kyriacos; Neocleous, Kyriacos; Hadjimitsis, Diofantos G.

    2016-10-01

    Deterioration of asphalt road pavements is inevitable throughout its life cycle. There are several types of deterioration that take place on these surfaces, like surface defects and deformations. One of the most common asphalt defects is cracking. Fatigue, transverse, longitudinal, reflective, edge, block and slippage are types of cracking that can be observed anywhere in the world. Monitoring and preventative/periodic maintenance of these types of wears are two very important actions that have to take place to avoid "costly" solutions. This paper aims to introduce the spectral characteristics of uncracked (healthy) and cracked asphalt surfaces which can give a new asphalt crack index. This is performed through remote sensing applications in the area of asphalt pavements. Multispectral images can be elaborated using the index to enhance crack marks on asphalt surfaces. Ground spectral signatures were acquired from both uncracked and cracked asphalted areas of Cyprus (Limassol). Evaluation separability indices can be used to identify the optimum wavelength regions that can distinguish better the uncracked and cracked asphalt surfaces. The results revealed that the spectral sensitivity for the enhancement of cracked asphalt was detected using the Euclidean, Mahalanobis and Cosine Distance Indices in the Vis range (approximately at 450 nm) and in the SWIR 1 range (approximately at 1750 nm).

  15. An Approach for Nonlinear Fatigue Damage Evaluation in Asphalt Pavements

    Science.gov (United States)

    Rajbongshi, Pabitra; Thongram, Sonika

    2016-09-01

    Fatigue due to vehicular loads is one of the primary distress mechanisms in asphalt pavements. It happens primarily due to deterioration in asphalt material with load repetitions. Degradation of asphalt material may be evaluated using different parameters. In view of degradation, the incremental damage in a given pavement section would be different for different repetitions, even with same loadings. Therefore, the damage progression becomes nonlinear with repetitions. Accounting such nonlinearity in damage accumulation, and based on different damage evaluation parameters, this paper presents an equivalent approach for fatigue damage evaluation in asphalt pavements. Traditional fatigue equation adopted in mechanistic-empirical pavement design has been used in the present work. Four different criteria, namely number of load repetitions, asphalt stiffness reduction, strain enhancement and fatigue life reduction with repetitions are considered for damage estimation. The proposed approach could estimate same value of nonlinear damage, irrespective of the criteria used. The simplest form of criterion i.e. the number of load repetitions can be used for fatigue performance evaluation. Probabilistically, the damage propagation is also correlated and assessed with the failure probability.

  16. Thermal stability analysis under embankment with asphalt pavement and cement pavement in permafrost regions.

    Science.gov (United States)

    Junwei, Zhang; Jinping, Li; Xiaojuan, Quan

    2013-01-01

    The permafrost degradation is the fundamental cause generating embankment diseases and pavement diseases in permafrost region while the permafrost degradation is related with temperature. Based on the field monitoring results of ground temperature along G214 Highway in high temperature permafrost regions, both the ground temperatures in superficial layer and the annual average temperatures under the embankment were discussed, respectively, for concrete pavements and asphalt pavements. The maximum depth of temperature field under the embankment for concrete pavements and asphalt pavements was also studied by using the finite element method. The results of numerical analysis indicate that there were remarkable seasonal differences of the ground temperatures in superficial layer between asphalt pavement and concrete pavement. The maximum influencing depth of temperature field under the permafrost embankment for every pavement was under the depth of 8 m. The thawed cores under both embankments have close relation with the maximum thawed depth, the embankment height, and the service time. The effective measurements will be proposed to keep the thermal stabilities of highway embankment by the results.

  17. Survival Analysis of Fatigue and Rutting Failures in Asphalt Pavements

    Directory of Open Access Journals (Sweden)

    Pabitra Rajbongshi

    2016-01-01

    Full Text Available Fatigue and rutting are two primary failure mechanisms in asphalt pavements. The evaluations of fatigue and rutting performances are significantly uncertain due to large uncertainties involved with the traffic and pavement life parameters. Therefore, deterministically it is inadequate to predict when an in-service pavement would fail. Thus, the deterministic failure time which is known as design life (yr of pavement becomes random in nature. Reliability analysis of such time (t dependent random variable is the survival analysis of the structure. This paper presents the survival analysis of fatigue and rutting failures in asphalt pavement structures. It is observed that the survival of pavements with time can be obtained using the bathtub concept that contains a constant failure rate period and an increasing failure rate period. The survival function (S(t, probability density function (pdf, and probability distribution function (PDF of failure time parameter are derived using bathtub analysis. It is seen that the distribution of failure time follows three parametric Weibull distributions. This paper also works out to find the most reliable life (YrR of pavement sections corresponding to any reliability level of survivability.

  18. Laboratory Measurements of Particulate Matter Concentrations from Asphalt Pavement Abrasion

    Science.gov (United States)

    Fullová, Daša; Đurčanská, Daniela

    2016-12-01

    The issue of emissions from road traffic is compounded by the fact that the number of vehicles and driven kilometres increase each year. Road traffic is one of the main sources of particulate matter and traffic volume is still increasing and has unpleasant impact on longevity of the pavements and the environment. Vehicle motions cause mechanical wearing of the asphalt pavement surface - wearing course by vehicle tyres. The contribution deals with abrasion of bituminous wearing courses of pavements. The asphalt mixtures of wearing courses are compared in terms of mechanically separated particulate matter. The samples of asphalt mixtures were rutted in wheel tracking machine. The particulate matter measurements were performed in laboratory conditions. The experimental laboratory measurements make it possible to sample particulates without contamination from exhaust emissions, abraded particles from vehicles, resuspension of road dust and climate affects. The contribution offers partial results of measurements on six trial samples of asphalt mixtures with different composition. It presents particulate matter morphology and the comparison of rutted asphalt samples in terms of PM mass concentrations and chemical composition.

  19. Laboratory Measurements of Particulate Matter Concentrations from Asphalt Pavement Abrasion

    Directory of Open Access Journals (Sweden)

    Fullová Daša

    2016-12-01

    Full Text Available The issue of emissions from road traffic is compounded by the fact that the number of vehicles and driven kilometres increase each year. Road traffic is one of the main sources of particulate matter and traffic volume is still increasing and has unpleasant impact on longevity of the pavements and the environment. Vehicle motions cause mechanical wearing of the asphalt pavement surface - wearing course by vehicle tyres. The contribution deals with abrasion of bituminous wearing courses of pavements. The asphalt mixtures of wearing courses are compared in terms of mechanically separated particulate matter. The samples of asphalt mixtures were rutted in wheel tracking machine. The particulate matter measurements were performed in laboratory conditions. The experimental laboratory measurements make it possible to sample particulates without contamination from exhaust emissions, abraded particles from vehicles, resuspension of road dust and climate affects. The contribution offers partial results of measurements on six trial samples of asphalt mixtures with different composition. It presents particulate matter morphology and the comparison of rutted asphalt samples in terms of PM mass concentrations and chemical composition.

  20. Numerical Analysis of Asphalt Pavements under Moving Wheel Loads

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    The responses of the pavement in service are the basis for the design of the semi-rigid base course asphalt pavement.Due to the dynamic characteristics of wheel loads and the temperature loads,the dynamic response analysis is very significant.In this article, the dynamic analysis of asphalt pavement under moving wheel loads is carried out using finite element method coupled with non-reflective boundary method.The influences of the base modulus, thickness, the vehicle velocity, the tire pressure, and the contact condition at the interface are studied using parametric analysis.The results of numerical analysis show that it is not appropriate to simply increase the base modulus or thickness in the design.It would be beneficial if the base design is optimized synthetically.The increase of damping is also beneficial to the pavements because of the surface deflection and the stresses declination.Furthermore, the good contact condition at the interface results in good performance because it combines every layer of the pavement to work together.As overload aggravates the working condition of the pavement, it is not allowed.

  1. Fatigue behavior of asphalt mixtures colombian with addition recycled pavement asphalt to 100 %

    Directory of Open Access Journals (Sweden)

    Neidy Betssey Patiño Boyacá

    2015-01-01

    Full Text Available This research was conducted in order to establish the fatigue behavior of asphalt mixtures with gradations MD20 Instituto de Desarrollo Urbano (IDU and MDC 2 of The Instituto Nacional de Vías (INVIAS, with addition of recycled granular flexible pavement (RAP with asphalt of penetration 60/70 and 80/100. The first step was to characterize the asphalt and RAP as well as calculate the optimum percentage of asphalt to be added to 100 % RAP mixtures. Then samples were fabricated with different trapezoidal gradations and asphalt, to be tested finally fatigue at different deformations. Among the results found, it was determined that the tested mixtures have a high stiffness; although, it varies depending on the asphalt mix used and that the best fatigue life with respect to those studied is the MDC-2 with bitumen 80/100.

  2. Load Response Analysis of Asphalt Pavement

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    Xiao Zhijun

    2016-01-01

    Full Text Available Based on the filed data of Fuzhou test road, load response regulation of nonlinear pavement structure was analyzed in this paper; Mechanics software was adopted to analyze linear elastic and nonlinear of the pavement structure, analyzed results and road filed data were compared, and determine the correlation between them and the field data.

  3. Representative volume element of asphalt pavement for electromagnetic measurements

    Directory of Open Access Journals (Sweden)

    Terhi Pellinen

    2015-02-01

    Full Text Available The motivation for this study was to investigate the representative volume element (RVE needed to correlate the nondestructive electromagnetic (EM measurements with the conventional destructive asphalt pavement quality control measurements. A large pavement rehabilitation contract was used as the test site for the experiment. Pavement cores were drilled from the same locations where the stationary and continuous Ground Penetrating Radar (GPR measurements were obtained. Laboratory measurements included testing the bulk density of cores using two methods, the surface-saturated dry method and determining bulk density by dimensions. Also, Vector Network Analyzer (VNA and the through specimen transmission configuration were employed at microwave frequencies to measure the reference dielectric constant of cores using two different footprint areas and therefore volume elements. The RVE for EM measurements turns out to be frequency dependent; therefore in addition to being dependent on asphalt mixture type and method of obtaining bulk density, it is dependent on the resolution of the EM method used. Then, although the average bulk property results agreed with theoretical formulations of higher core air void content giving a lower dielectric constant, for the individual cores there was no correlation for the VNA measurements because the volume element seizes deviated. Similarly, GPR technique was unable to capture the spatial variation of pavement air voids measured from the 150-mm drill cores. More research is needed to determine the usable RVE for asphalt.

  4. Decision of National and Provincial Highway Asphalt Pavement Structure Based on Value Engineering

    Directory of Open Access Journals (Sweden)

    Yingwei Ren

    2014-01-01

    Full Text Available It is important that decision of asphalt pavement structure requires overall considerations of the performance and financial investment. To have asphalt pavement structure fulfilling good reliability, the asphalt pavement structure decision was researched based on value engineering theory. According to the national and provincial highway investigation data in Shandong Province during the last decade, the asphalt pavement performance attenuation rules of traffic levels and asphalt layer thicknesses were developed, and then the road performance evaluation method was presented. In addition, the initial investments, the costs of road maintenance, and middle-scale repair in a period were analyzed. For the light traffic and medium traffic example, using the value engineering method, the pavement performance and costs of which thickness varies from 6 cm to 10 cm were calculated and compared. It was concluded that value engineering was an effective method in deciding the asphalt pavement structure.

  5. Performance of Recycled Asphalt Pavement as Coarse Aggregate in Concrete

    Directory of Open Access Journals (Sweden)

    Fidelis O. OKAFOR

    2010-12-01

    Full Text Available Recycled asphalt pavement (RAP is the reclaimed and reprocessed pavement material containing asphalt and aggregate. Most RAP is recycled back into pavements, and as a result there is a general lack of data pertaining to the mechanical properties for RAP in other possible applications such as Portland cement concrete. In the present study, some mechanical properties of Portland cement concrete containing RAP as coarse aggregate were investigated in the laboratory. Six concrete mixes of widely differing water/cement ratios and mix proportions were made using RAP as coarse aggregate. The properties tested include the physical properties of the RAP aggregate, the compressive and flexural strengths of the concrete. These properties were compared with those of similar concretes made with natural gravel aggregate. Results of the tests suggest that the strength of concrete made from RAP is dependent on the bond strength of the “asphalt-mortar” (asphalt binder-sand-filler matrix coatings on the aggregates and may not produce concrete with compressive strength above 25 MPa. However, for middle and low strength concrete, the material was found to compare favorably with natural gravel aggregate.

  6. Rutting Prediction in Asphalt Pavement Based on Viscoelastic Theory

    Directory of Open Access Journals (Sweden)

    Nahi Mohammed Hadi

    2016-01-01

    Full Text Available Rutting is one of the most disturbing failures on the asphalt roads due to the interrupting it is caused to the drivers. Predicting of asphalt pavement rutting is essential tool leads to better asphalt mixture design. This work describes a method of predicting the behaviour of various asphalt pavement mixes and linking these to an accelerated performance testing. The objective of this study is to develop a finite element model based on viscoplastic theory for simulating the laboratory testing of asphalt mixes in Hamburg Wheel Rut Tester (HWRT for rutting. The creep parameters C1, C2 and C3 are developed from the triaxial repeated load creep test at 50°C and at a frequency of 1 Hz and the modulus of elasticity and Poisson’ s ratio determined at the same temperature. Viscoelastic model (creep model is adopted using a FE simulator (ANSYS in order to calculate the rutting for various mixes under a uniform loading pressure of 500 kPa. An eight-node with a three Degrees of Freedom (UX, UY, and UZ Element is used for the simulation. The creep model developed for HWRT tester was verified by comparing the predicted rut depths with the measured one and by comparing the rut depth with ABAQUS result from literature. Reasonable agreement can be obtained between the predicted rut depths and the measured one. Moreover, it is found that creep model parameter C1 and C3 have a strong relationship with rutting. It was clear that the parameter C1 strongly influences rutting than the parameter C3. Finally, it can be concluded that creep model based on finite element method can be used as an effective tool to analyse rutting of asphalt pavements.

  7. Effects of reclaimed asphalt pavement on indirect tensile strength test of foamed asphalt mix tested in dry condition

    Science.gov (United States)

    Yati Katman, Herda; Rasdan Ibrahim, Mohd; Yazip Matori, Mohd; Norhisham, Shuhairy; Ismail, Norlela

    2013-06-01

    Indirect tensile strength (ITS) test was conducted to analyse strength of the foamed asphalt mixes incorporating reclaimed asphalt pavement. Samples were tested for ITS after cured in the oven at 40°C for 72 hours. This testing condition known as dry condition or unconditioned. Laboratory results show that reclaimed asphalt pavement (RAP) contents insignificantly affect the ITS results. ITS results significantly affected by foamed bitumen contents.

  8. Research on the relationship between water stability and aggregate gradation of asphalt pavement

    OpenAIRE

    Zhao Bing; Zhao Bo

    2015-01-01

    In the early destruction of asphalt pavement, water damage is the most major form.In this paper, experimental study was conducted on the composition of asphalt concrete,Marshall specimens were made in different types of aggregate gradation with the same kind of asphalt. Water immersion tests were conducted in order to analysis the relationship between the water stability and aggregate gradation of asphalt pavement.

  9. Research on the relationship between water stability and aggregate gradation of asphalt pavement

    Directory of Open Access Journals (Sweden)

    Zhao Bing

    2015-05-01

    Full Text Available In the early destruction of asphalt pavement, water damage is the most major form.In this paper, experimental study was conducted on the composition of asphalt concrete,Marshall specimens were made in different types of aggregate gradation with the same kind of asphalt. Water immersion tests were conducted in order to analysis the relationship between the water stability and aggregate gradation of asphalt pavement.

  10. The effect of aggregate density on pavement performance of SMA-13 asphalt mixture

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    Qiao Yinping

    2016-05-01

    Full Text Available This paper chooses the top layer SMA-13 asphalt mixture material as the research object. Basalt was selected as pavement material, and modified SBS asphalt was used as a cementing material. Two basalt aggregates with different densities were used to carry out standard Marshall test in the laboratory.Aimed at the volume parameters of the asphalt mixture carry on anaiysis,and obtian the effect of aggregate density on pavement performance of SMA-13 asphalt mixture, which is that the density of aggregate has a significant effect on the void ratio, saturation, and the gap rate of the aggregate, thus affecting the pavement performance of the asphalt mixture

  11. Structural Design of Asphalt Pavement for Low Cost Rural Roads

    Institute of Scientific and Technical Information of China (English)

    Yuan Goulin; Chen Rongshen

    2006-01-01

    On the basis of the equivalent axle load action frequency, the traffic classifications of rural roads as well as their corresponding types are classified. The asphalt pavement structure, road surface types and thickness of the rural roads are suggested for the various action frequency of the equivalent axle load. Furthermore, the roadbase thickness graphs are provided according to different equivalent axle load action frequency with different roadbed modulus and road surface modulus taken into account.

  12. The Research on the Cracks of the Asphalt Pavement

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    OuYangZiqiang

    2015-07-01

    Full Text Available The cracking is one of the common diseases of the asphalt pavement. According to the shape and the forming reasons, the cracks can be divided into two categories. Each categories can be divided into several types. Through the comparison and the analysis of the causes of different cracks, the prevention and the treatments are proposed in the respects of the structural design, material design and construction

  13. Recent rubber crumb asphalt pavement projects in Alberta

    Energy Technology Data Exchange (ETDEWEB)

    Soleyman, H.R. [Alberta Univ., Edmonton, AB (Canada). Dept. of Civil and Environmental Engineering; Pulles, B.C.M.; Treleaven, L.B. [EBA Engineering Consultants Ltd., Edmonton, AB (Canada)

    2003-07-01

    Several countries around the world have been using rubber crumb (RC) for pavement applications for more than 20 years. The performance of asphalt pavements is enhanced by the use of recycled tires, which has the added advantage of solving the problem of tire disposal. In 2002, the Tire Recycling Management Association of Alberta (TRMA) and Alberta Transportation (AT) evaluated the feasibility and performance of an overlay using asphalt rubber (AR) pavement in Alberta. A partnership in the project was formed by AT, the City of Calgary, the City of Edmonton, and Strathcona County, where each one paved one section of a road with AR in conjunction with a section using conventional or other asphalt mixture types. The roads selected were: (1) 112 Avenue North West in Calgary, (2) 17 Street and Baseline Road in Strathcona County, (3) 137 Avenue in Edmonton, and (4) highway 630 in the vicinity of North Cooking Lake (Alberta Transportation). Two different AR pavement thicknesses were used to study the effects of overlay thicknesses on the performance of the overlay. The structural and functional factors were monitored before, during and after the construction of all sections. The preliminary evaluation of the application of AR in Alberta was presented, along with a summary of test results and performances of AR pavement sections. A full freeze-thaw cycle is required (Spring 2003) before the results of the analysis of the testing are known. The reduced thickness AR sections performed in a similar manner to those with full thickness AC sections. 10 refs., 5 tabs., 3 figs.

  14. Assessment of low temperature cracking in asphalt pavement mixes and rheological performance of asphalt binders

    Science.gov (United States)

    Sowah-Kuma, David

    Government spends a lot of money on the reconstruction and rehabilitation of road pavements in any given year due to various distresses and eventual failure. Low temperature (thermal) cracking, one of the main types of pavement distress, contributes partly to this economic loss, and comes about as a result of accumulated tensile strains exceeding the threshold tensile strain capacity of the pavement. This pavement distress leads to a drastic reduction of the pavement's service life and performance. In this study, the severity of low temperature (thermal) cracking on road pavements selected across the Province of Ontario and its predicted time to failure was assessed using the AASTHO Mechanistic-Empirical Pavement Design Guide (MEPDG) and AASHTOWARE(TM) software, with inputs such as creep compliance and tensile strength from laboratory test. Highway 400, K1, K2, Y1, Sasobit, Rediset LQ, and Rediset WMX were predicted to have a pavement in-service life above 15 years. Additionally, the rheological performance of the recovered asphalt binders was assessed using Superpave(TM) tests such as the dynamic shear rheometer (DSR) and bending beam rheometer (BBR). Further tests using modified standard protocols such as the extended bending beam rheometer (eBBR) (LS-308) test method and double-edge notched tension (DENT) test (LS-299) were employed to evaluate the failure properties associated with in service performance. The various rheological tests showed K1 to be the least susceptible to low temperature cracking compared to the remaining samples whiles Highway 24 will be highly susceptible to low temperature cracking. X-ray fluorescence (XRF) analysis was performed on the recovered asphalt binders to determine the presence of metals such as zinc (Zn) and molybdenum (Mo) believed to originate from waste engine oil, which is often added to asphalt binders. Finally, the severity of oxidative aging (hardening) of the recovered asphalt binders was also evaluated using the

  15. Asphalt Pavement Aging and Temperature Dependent Properties Using Functionally Graded Viscoelastic Model

    Science.gov (United States)

    Dave, Eshan V.

    2009-01-01

    Asphalt concrete pavements are inherently graded viscoelastic structures. Oxidative aging of asphalt binder and temperature cycling due to climatic conditions being the major cause of non-homogeneity. Current pavement analysis and simulation procedures dwell on the use of layered approach to account for these non-homogeneities. The conventional…

  16. Sensitivity analysis of longitudinal cracking on asphalt pavement using MEPDG in permafrost region

    OpenAIRE

    Chen Zhang; Hainian Wang; Zhanping You; Biao Ma

    2015-01-01

    Longitudinal cracking is one of the most important distresses of asphalt pavement in permafrost regions. The sensitivity analysis of design parameters for asphalt pavement can be used to study the influence of every parameter on longitudinal cracking, which can help optimizing the design of the pavement structure. In this study, 20 test sections of Qinghai–Tibet Highway were selected to conduct the sensitivity analysis of longitudinal cracking on material parameter based on Mechanistic-Empiri...

  17. Assessment of porous asphalt pavement performance: hydraulics and water quality

    Science.gov (United States)

    Briggs, J. F.; Ballestero, T. P.; Roseen, R. M.; Houle, J. J.

    2005-05-01

    The objective of this study is to focus on the water quality treatment and hydraulic performance of a porous asphalt pavement parking lot in Durham, New Hampshire. The site was constructed in October 2004 to assess the suitability of porous asphalt pavement for stormwater management in cold climates. The facility consists of a 4-inch asphalt open-graded friction course layer overlying a high porosity sand and gravel base. This base serves as a storage reservoir in-between storms that can slowly infiltrate groundwater. Details on the design, construction, and cost of the facility will be presented. The porous asphalt pavements is qualitatively monitored for signs of distress, especially those due to cold climate stresses like plowing, sanding, salting, and freeze-thaw cycles. Life cycle predictions are discussed. Surface infiltration rates are measured with a constant head device built specifically to test high infiltration capacity pavements. The test measures infiltration rates in a single 4-inch diameter column temporarily sealed to the pavement at its base. A surface inundation test, as described by Bean, is also conducted as a basis for comparison of results (Bean, 2004). These tests assess infiltration rates soon after installation, throughout the winter, during snowmelt, after a winter of salting, sanding, and plowing, and after vacuuming in the spring. Frost penetration into the subsurface reservoir is monitored with a frost gauge. Hydrologic effects of the system are evaluated. Water levels are monitored in the facility and in surrounding wells with continuously logging pressure transducers. The 6-inch underdrain pipe that conveys excess water in the subsurface reservoir to a riprap pad is also continuously monitored for flow. Since porous asphalt pavement systems infiltrate surface water into the subsurface, it is important to assess whether water quality treatment performance in the subsurface reservoir is adequate. The assumed influent water quality is

  18. Greenhouse Gas Emissions from Asphalt Pavement Construction: A Case Study in China.

    Science.gov (United States)

    Ma, Feng; Sha, Aimin; Lin, Ruiyu; Huang, Yue; Wang, Chao

    2016-03-22

    In China, the construction of asphalt pavement has a significant impact on the environment, and energy use and greenhouse gas (GHG) emissions from asphalt pavement construction have been receiving increasing attention in recent years. At present, there is no universal criterion for the evaluation of GHG emissions in asphalt pavement construction. This paper proposes to define the system boundaries for GHG emissions from asphalt pavement by using a process-based life cycle assessment method. A method for evaluating GHG emissions from asphalt pavement construction is suggested. The paper reports a case study of GHG emissions from a typical asphalt pavement construction project in China. The results show that the greenhouse gas emissions from the mixture mixing phase are the highest, and account for about 54% of the total amount. The second highest GHG emission phase is the production of raw materials. For GHG emissions of cement stabilized base/subbase, the production of raw materials emits the most, about 98%. The GHG emission for cement production alone is about 92%. The results indicate that any measures to reduce GHG emissions from asphalt pavement construction should be focused on the raw materials manufacturing stage. If the raw materials production phase is excluded, the measures to reduce GHG emissions should be aimed at the mixture mixing phase.

  19. The Effect of Joint Width on Structural Performance of Asphalt Block Pavements

    Directory of Open Access Journals (Sweden)

    Ahmed Abdelgalil

    2014-02-01

    Full Text Available Asphalt blocks have been occasionally used around the world as a road pavement, but there have been very limited studies being done to evaluate the effect of joint width (spacing between the blocks on the structural performance of asphalt paving blocks. This study explains the experimental study to assess the performance and properties of asphalt paving blocks laid with different joint widths between the blocks i.e., 0, 2 and 3 mm, respectively. A total of 250 asphalt paving blocks was manufactured and tested in the laboratory to ascertain the density, air voids, the compressive strength and the rut depth and displacement occurred in asphalt paving block. The design compressive load of single asphalt paving block is 166 kN. The test results showed that the joint width plays a vital role on the performance of asphalt block pavement. Asphalt paving blocks were laid as closely in contact as possible (0 mm yields the best structural performance.

  20. Evaluation of Warm-Mix Asphalt Technologies for Use on Airfield Pavements

    Science.gov (United States)

    2013-12-01

    Auburn, AL: National Center for Asphalt Technology. Cooley Jr., L. A. 2003. Evaluation of Pavement Permeability in Mississippi. Auburn, AL: National...ER D C/ G SL T R -1 2 -3 Evaluation of Warm-Mix Asphalt Technologies for Use on Airfield Pavements G eo te ch n ic al a n d S tr u ct...default. ERDC/GSL TR-12-3 February 2012 (Revised December 2013) Evaluation of Warm-Mix Asphalt Technologies for Use on Airfield Pavements

  1. Research on nonlinear constitutive relationship of permanent deformation in asphalt pavements

    Institute of Scientific and Technical Information of China (English)

    PENG; Miaojuan; XU; Zhihong

    2006-01-01

    To predict correctly the rut depths in asphalt pavements,a new nonlinear viscoelastic-elastoplastic constitutive model of permanent deformation in asphalt pavements is presented.The model combines a generalized Maxwell model with an elastoplastic one.Then from the creep theory,the linear and nonlinear constitutive equations of the generalized Maxwell model are obtained.From the nonlinear finite element method for the rutting of the asphalt pavement,the rut depths of 4 asphalt-aggregate mixtures are obtained.And the results are compared with the ones from the finite element method by SHRP and the experiments by SWK/UN.The results in this paper are better than the ones by SHRP,and agree with the ones of the experiment by SWK/UN.This shows that the nonlinear viscoelastic-elastoplastic constitutive model,which is presented in this paper for the rutting of the asphalt pavement,is effective.The properties,such as nonlinear elasticity,plasticity,viscoelasticity and nonlinear viscoelasticity,which affect the rutting of an asphalt pavement,can be shown in the model.And the characteristics of the permanent deformation of the asphalt pavement can be presented entirely in the model.

  2. Use of Reclaimed Asphalt Pavement in Conjunction with Ground Improvement: A Case History

    OpenAIRE

    Foye, Kevin C.

    2011-01-01

    The use of Reclaimed Asphalt Pavement (RAP) in lieu of virgin crushed stone aggregate is becoming a widely accepted practice for a number of construction applications, particularly pavement base courses. A number of laboratory RAP studies have considered the mechanical properties of RAP bases in order to support pavement designs incorporating RAP. These studies have revealed a number of interesting relationships between RAP moisture content, compaction, and stiffness. This paper discusses the...

  3. Evaluation of Warm Mix Asphalt Technologies and Recycled Asphalt Pavements in Truckee Meadows, Nevada

    Science.gov (United States)

    Diaz Montecino, Cristian

    This study evaluated the properties and laboratory-performance of Hot Mix Asphalt (HMA) and Warm Mix Asphalt (WMA) mixtures with different levels of Recycled Asphalt Pavements (RAP) content: none for control mixtures, around 15% by dry weight of aggregates, and more than 30% by dry weight of aggregates. The rheological properties were evaluated for virgin and recovered RAP asphalt binders. The target amount of RAP in the mixtures was determined by using Blending Charts and Mortar Experiments. The mixtures are design through the guidelines established in Marshall Mix Design Method considering additional modifications for RAP and WMA from Superpave Mix Design. The mixtures are evaluated for their resistance to moisture damage by means of measuring the Dynamic Modulus |E*| after three freeze/thaw cycles and the indirect tensile strength after one and three freeze/thaw cycles. The resistance of the mixtures to permanent deformation was also evaluated by using the Asphalt Mixture Performance Tester (AMPT) to measure the flow number (FN). For this study, it was determined that the resistance to moisture damage decreases as the number of freeze/thaw cycles increases for most of the evaluated mixtures. Mixtures exhibited an increase in dynamic modulus as the RAP percentage increased. A decrease in the resistance to moisture damage was detected with the increase in RAP content for most of the mixtures. HMA mixtures exhibited a better performance in rutting than the WMA mixtures. An increase in rutting resistance was observed with the increase in RAP percentage for HMA mixtures whereas an inconsistent trend was observed for WMA mixtures. Further study is needed to validate the use of the high percentage of RAP in Washoe County.

  4. Comparing Production and Placement of Warm-Mix Asphalt to Traditional Hot-Mix Asphalt for Constructing Airfield Pavements

    Science.gov (United States)

    2013-08-01

    pressure cells ( EPC ), single depth deflectometers (SDD), and asphalt strain gauges (ASG) are indicated by symbols denoted on the figures. Further...gauges, I-buttons, ASGs, SDDs, and EPCs to measure the pavement response to simulated aircraft loading. The asphalt concrete strain gauges (Figure 55...gauge in backscatter mode. The type of roller used for each pass is indicated on each figure. The contractor determined how many roller passes to use

  5. Criteria for asphalt-rubber concrete in civil airport pavements: Mixture design

    Science.gov (United States)

    Roberts, F. L.; Lytton, R. L.; Hoyt, D.

    1986-07-01

    A mixture design procedure is developed to allow the use of asphalt-rubber binders in concrete for flexible airport pavement. The asphalt-rubber is produced by reacting asphalt with ground, scrap tire rubber to produce the binder for the asphalt-rubber concrete. Procedures for laboratory preparation of alsphalt-rubber binders using an equipment setup that was found by researchers to produce laboratory binders with similar properties to field processes are included. The rubber-asphalt concrete mixture design procedure includes adjustments to the aggregate gradation to permit space for the rubber particles in the asphalt-rubber binder as well as suggested mixing and compaction temperatures, and compaction efforts. While the procedure was used in the laboratory to successfully produce asphalt-rubber concrete mixtures, it should be evaluated in the field to ensure that consistent results can be achieved in a production environment.

  6. The Development of Recycling Agent for Asphalt Pavement

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    A type of recycling agent was developed and its use for modifying used asphalt is described.The results show that the viscosity and three main properties of the aged asphalt were remarkably improved.With 5%-7% content of recycling agent, the main properties of recycled asphalt comported with China GB asphalt standard AH-70 and the recycled asphalt concrete could be used as high-grade highway.Furthermore,the recycling mechanism of the aged asphalt is discussed.

  7. A hybrid strategy in selecting diverse combinations of innovative sustainable materials for asphalt pavements

    Directory of Open Access Journals (Sweden)

    Baron Colbert

    2016-04-01

    Full Text Available This project integrates recent innovations of recycled materials used in designing and building sustainable pavements. An increasing environmental awareness and the demand for improving economic and construction efficiencies, through measures such as construction warrantees and goals to reduce air pollution under the Kyoto Protocol, have increased the efforts to implement sustainable materials in roadways. The objective of this research is to develop a systematic approach toward selecting optimum combinations of sustainable materials for the construction of asphalt pavements. The selected materials, warm mix asphalt (WMA, recycled asphalt shingles (RAS, and reclaimed asphalt pavement (RAP were incorporated in this study. The results of this research are intended to serve as guidelines in the selection of the mixed sustainable materials for asphalt pavements. The approach developed from this project draws upon previous research efforts integrating graphical modeling with optimizing the amount of sustainable materials based on the performance. With regard to moisture susceptibility and rutting potential test results, as well as the MIM analysis based on a 95% confidence interval, the rutting performance and moisture susceptibility of asphalt mixtures are not significantly different regardless of the percentages of RAS, RAP, or WMA. The optimum mixture choices could be made by the plant emission rankings with consideration of the optimal WMA types, percentages of RAS/RAP, and WMA production temperatures. The WMA mixtures prepared with 75% RAP and Advera® WMA have produced the lowest CO2 emissions among the investigated mixture types.

  8. Analytical prediction and field validation of transient temperature field in asphalt pavements

    Institute of Scientific and Technical Information of China (English)

    陈嘉祺; 李亮; 汪浩

    2015-01-01

    This work presented the development and validation of an analytical method to predict the transient temperature field in the asphalt pavement. The governing equation for heat transfer was based on heat conduction radiation and convection. An innovative time-dependent function was proposed to predict the pavement surface temperature with solar radiation and air temperature using dimensional analysis in order to simplify the complex heat exchange on the pavement surface. The parameters for the time-dependent pavement surface temperature function were obtained through the regression analysis of field measurement data. Assuming that the initial pavement temperature distribution was linear and the influence of the base course materials on the temperature of the upper asphalt layers was negligible, a close-form analytical solution of the temperature in asphalt layers was derived using Green’s function. Finally, two numerical examples were presented to validate the model solutions with field temperature measurements. Analysis results show that the solution accuracy is in agreement with field data and the relative errors at a shallower depth are greater than those at a deeper one. Although the model is not sensitive to dramatic changes in climatic factors near the pavement surface, it is applicable for predicting pavement temperature field in cloudless days.

  9. An Optimization Model for Design of Asphalt Pavements Based on IHAP Code Number 234

    Directory of Open Access Journals (Sweden)

    Ali Reza Ghanizadeh

    2016-01-01

    Full Text Available Pavement construction is one of the most costly parts of transportation infrastructures. Incommensurate design and construction of pavements, in addition to the loss of the initial investment, would impose indirect costs to the road users and reduce road safety. This paper aims to propose an optimization model to determine the optimal configuration as well as the optimum thickness of different pavement layers based on the Iran Highway Asphalt Paving Code Number 234 (IHAP Code 234. After developing the optimization model, the optimum thickness of pavement layers for secondary rural roads, major rural roads, and freeways was determined based on the recommended prices in “Basic Price List for Road, Runway and Railway” of Iran in 2015 and several charts were developed to determine the optimum thickness of pavement layers including asphalt concrete, granular base, and granular subbase with respect to road classification, design traffic, and resilient modulus of subgrade. Design charts confirm that in the current situation (material prices in 2015, application of asphalt treated layer in pavement structure is not cost effective. Also it was shown that, with increasing the strength of subgrade soil, the subbase layer may be removed from the optimum structure of pavement.

  10. The design and analysis on asphalt concrete pavement%沥青混凝土路面设计分析

    Institute of Scientific and Technical Information of China (English)

    王星茹

    2016-01-01

    This paper introduced the design process of urban road asphalt pavement,discussed the material and type of asphalt concrete pave-ment,from the pavement structure combination design,pavement design index,pavement structure layer calculation and other aspects,elabora-ted the design method of asphalt concrete pavement,made the asphalt pavement meet the structure strength and stability requirements.%介绍了城市道路沥青路面设计的流程,论述了沥青混凝土面层的材料与类型,从路面结构组合设计、路面设计指标、路面结构层计算等方面,阐述了沥青混凝土路面的设计方法,使沥青路面满足结构强度和稳定性的要求.

  11. Research on segregation evaluation methods of asphalt pavement based on air voids distribution

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    Eye observation was used to evaluate the segregation degree of asphalt pavement, which was not much creditable. To the asphalt pavement, road surface texture measuring method which has appeared recently can identify gradational segregation; but it can't reflect the influence of the temperature segregation. However,using infrared temperature detector to evaluate the segregation must be taken during paving, which brings much inconvenience. In this paper, measuring the air voids distribution using non-nuclear density gauge to evaluate asphalt pavement segregation was introduced. Result shows that this method can directly reflect the comprehensive results of the two types of segregation in a high efficient and accurate way. Moreover, using the sketch map of segregation area can help to analyze the segregation reason visually.

  12. Viscoroute 2.0: a tool for the simulation of moving load effects on asphalt pavement

    CERN Document Server

    Chabot, Armelle; Deloffre, Lydie; Duhamel, Denis

    2010-01-01

    As shown by strains measured on full scale experimental aircraft structures, traffic of slow-moving multiple loads leads to asymmetric transverse strains that can be higher than longitudinal strains at the bottom of asphalt pavement layers. To analyze this effect, a model and a software called ViscoRoute have been developed. In these tools, the structure is represented by a multilayered half-space, the thermo-viscoelastic behaviour of asphalt layers is accounted by the Huet-Sayegh rheological law and loads are assumed to move at constant speed. First, the paper presents a comparison of results obtained with ViscoRoute to results stemming from the specialized literature. For thick asphalt pavement and several configurations of moving loads, other ViscoRoute simulations confirm that it is necessary to incorporate viscoelastic effects in the modelling to well predict the pavement behaviour and to anticipate possible damages in the structure.

  13. Analysis on durability of asphalt pavement%沥青路面耐久性分析

    Institute of Scientific and Technical Information of China (English)

    车守忠

    2011-01-01

    简要介绍了我国沥青混凝土路面使用现状,针对沥青路面的损坏问题进行了分析,分别阐述了影响沥青路面耐久性的内部因素和外部因素,从原材料、配合比、防水设计等方面入手提出了耐久性改善措施,以期指导实践。%This paper briefly introduced the current situation of asphalt concrete pavements in our country,according to the damage problems of asphalt pavement made analysis,elaborated separately the internal factors and external factors which affect the durability of asphalt pavement,put forward durability improvement measures from raw materials,mixing ratio,waterproof design and other aspects,in order to guide practice.

  14. Development of a Full-Depth Wheel Tracking Test for Asphalt Pavement Structure: Methods and Performance Evaluation

    Directory of Open Access Journals (Sweden)

    Hui Wang

    2016-01-01

    Full Text Available The rutting performance of asphalt pavement structure relies on the high temperature properties of asphalt mixture as well as the pavement structure and thickness. In order to investigate the influence of the structure and thickness, a full-depth wheel tracking test is developed in this research by improving the conventional wheel tracking test apparatus. The newly proposed test method is capable of varying its load speed and load size, controlling its specimen temperature gradient, and simulating the support conditions of actual asphalt pavement. The full-depth wheel tracking test based rutting performance evaluation of different asphalt pavement structures indicates that it is not reasonable to explain the rutting performance of asphalt pavement structure from the point of view of single-layer asphalt mixture rutting performance. The developed full-depth wheel tracking test can be used to distinguish rutting performance of different asphalt pavement structures, and two of five typical asphalt pavement structures commonly used in Shanxi Province were suggested for use in practical engineering.

  15. A Review on Using Crumb Rubber in Reinforcement of Asphalt Pavement

    Directory of Open Access Journals (Sweden)

    Nuha Salim Mashaan

    2014-01-01

    Full Text Available An immense problem affecting environmental pollution is the increase of waste tyre vehicles. In an attempt to decrease the magnitude of this issue, crumb rubber modifier (CRM obtained from waste tyre rubber has gained interest in asphalt reinforcement. The use of crumb rubber in the reinforcement of asphalt is considered as a smart solution for sustainable development by reusing waste materials, and it is believed that crumb rubber modifier (CRM could be an alternative polymer material in improving hot mix asphalt performance properties. In this paper, a critical review on the use of crumb rubber in reinforcement of asphalt pavement will be presented and discussed. It will also include a review on the effects of CRM on the stiffness, rutting, and fatigue resistance of road pavement construction.

  16. A review on using crumb rubber in reinforcement of asphalt pavement.

    Science.gov (United States)

    Mashaan, Nuha Salim; Ali, Asim Hassan; Karim, Mohamed Rehan; Abdelaziz, Mahrez

    2014-01-01

    An immense problem affecting environmental pollution is the increase of waste tyre vehicles. In an attempt to decrease the magnitude of this issue, crumb rubber modifier (CRM) obtained from waste tyre rubber has gained interest in asphalt reinforcement. The use of crumb rubber in the reinforcement of asphalt is considered as a smart solution for sustainable development by reusing waste materials, and it is believed that crumb rubber modifier (CRM) could be an alternative polymer material in improving hot mix asphalt performance properties. In this paper, a critical review on the use of crumb rubber in reinforcement of asphalt pavement will be presented and discussed. It will also include a review on the effects of CRM on the stiffness, rutting, and fatigue resistance of road pavement construction.

  17. Field Performance of Asphalt Pavements with New Technologies in Northern Nevada

    Science.gov (United States)

    Faeth, Benjamin Michael

    The Regional Transportation Commission (RTC) of the Washoe Valley Area has been tasked to determine if three advanced asphalt pavement technologies and one modified aggregate gradation are suitable for implementation within Reno, Stead, and Sparks Nevada. This was accomplished through research and test roads and Intersections to determine if Recycled Asphalt Pavement (RAP), Warm Mix Asphalt (WMA), Polymer-Modified Asphalt Binder, and the Type 2-R aggregate gradation were succeeding in their design plans. Over the course of several years the streets being used by RTC to test the technologies are succeeding within their design lifespans, and the Intersections being used to test the Type 2-R aggregate gradation are showing significant resistance to rutting. Due to the roads and Intersections not being more than 10 years old, these conclusions are subject to change over time.

  18. Feasibility of using 100% Recycled Asphalt Pavement mixtures for road construction

    Science.gov (United States)

    Carlson, Russell Edgar, IV

    Recycled Asphalt Pavement (RAP) is the largest recycled good in the United States and 80 million tons are recycled yearly, saving taxpayers about $1.5 billion dollars. This paper explores the possibility of utilizing 100% RAP materials in asphalt pavement. Asphalt mixtures are produced at 135°C in a typical asphalt plant. However, at 135°C, not all binder from RAP materials may not become effective for coating aggregates. The main objective of the study is to determine the amount of effective binder available from RAP in the asphalt plant. The 100% RAP mixes have aged binder that can alter mix designs and interaction with virgin binder. In this study, to determine low temperature cracking resistance and fatigue performance, samples were prepared using a 100% RAP mix with no virgin binder and a 100% RAP mix with virgin asphalt binder to achieve the optimum binder content of the mix. Second, to determine the effectiveness of binder from RAP materials, compaction tests were performed by heating RAP materials at various temperatures. It was found that 100% RAP mixes cannot be feasible for field use if additional virgin binder is added to reach the optimum asphalt content. Based on limited test results, the low temperature grade was not within proper limits but the beam fatigue testing results were acceptable. Based on compaction test results, additional heating is needed to increase the effectiveness of asphalt binder from RAP materials.

  19. Thermal behavior of an asphalt pavement in the laboratory and in the parking lot.

    Science.gov (United States)

    Martinkauppi, J B; Mäkiranta, A; Kiijärvi, J; Hiltunen, E

    2015-01-01

    The urban, constructed areas are full of buildings and different kinds of pavements and have a noticeable lack of trees and flora. These areas are accumulating the heat from the Sun, people, vehicles, and constructions. One interesting heat collector is the asphalt pavement. How does the heat transfer to different layers under the pavement or does it? What are the temperatures under the pavement in Finland where the winter can be pretty hard? How can those temperatures be measured accurately? These are the main questions this paper gives the preliminary answers to. First the thermal behavior of asphalt and the layers beneath are researched in the laboratory and then the measurement field is bored and dug in the parking in the Western coast of Finland, 63°5'45'' N. Distributed temperature sensing method was found to be a good choice for temperature measurements. Thermal behavior of pavement has been monitored in different layers and the preliminary results have been published here. The goal of this research is to assess the applicability of asphalt pavements for heat energy collection.

  20. Thermal Behavior of an Asphalt Pavement in the Laboratory and in the Parking Lot

    Directory of Open Access Journals (Sweden)

    J. B. Martinkauppi

    2015-01-01

    Full Text Available The urban, constructed areas are full of buildings and different kinds of pavements and have a noticeable lack of trees and flora. These areas are accumulating the heat from the Sun, people, vehicles, and constructions. One interesting heat collector is the asphalt pavement. How does the heat transfer to different layers under the pavement or does it? What are the temperatures under the pavement in Finland where the winter can be pretty hard? How can those temperatures be measured accurately? These are the main questions this paper gives the preliminary answers to. First the thermal behavior of asphalt and the layers beneath are researched in the laboratory and then the measurement field is bored and dug in the parking in the Western coast of Finland, 63°5′45′′ N. Distributed temperature sensing method was found to be a good choice for temperature measurements. Thermal behavior of pavement has been monitored in different layers and the preliminary results have been published here. The goal of this research is to assess the applicability of asphalt pavements for heat energy collection.

  1. Stormwater quality of spring-summer-fall effluent from three partial-infiltration permeable pavement systems and conventional asphalt pavement.

    Science.gov (United States)

    Drake, Jennifer; Bradford, Andrea; Van Seters, Tim

    2014-06-15

    This study examined the spring, summer and fall water quality performance of three partial-infiltration permeable pavement (PP) systems and a conventional asphalt pavement in Ontario. The study, conducted between 2010 and 2012, compared the water quality of effluent from two Interlocking Permeable Concrete Pavements (AquaPave(®) and Eco-Optiloc(®)) and a Hydromedia(®) Pervious Concrete pavement with runoff from an Asphalt control pavement. The usage of permeable pavements can mitigate the impact of urbanization on receiving surface water systems through quantity control and stormwater treatment. The PP systems provided excellent stormwater treatment for petroleum hydrocarbons, total suspended solids, metals (copper, iron, manganese and zinc) and nutrients (total-nitrogen and total-phosphorus) by reducing event mean concentrations (EMC) as well as total pollutant loadings. The PPs significantly reduced the concentration and loading of ammonia (NH4(+)+NH3), nitrite (NO2(-)) and organic-nitrogen (Org-N) but increased the concentration and loading of nitrate (NO3(-)). The PP systems had mixed performances for the treatment of phosphate (PO4(3-)). The PP systems increased the concentration of sodium (Na) and chloride (Cl) but EMCs remained well below recommended levels for drinking water quality. Relative to the observed runoff, winter road salt was released more slowly from the PP systems resulting in elevated spring and early-summer Cl and Na concentrations in effluent. PP materials were found to introduce dissolved solids into the infiltrating stormwater. The release of these pollutants was verified by additional laboratory scale testing of the individual pavement and aggregate materials at the University of Guelph. Pollutant concentrations were greatest during the first few months after construction and declined rapidly over the course of the study.

  2. HOW TO OBTAIN ECONOMICALLY EFFICIENT ASPHALT CONCRETE MIXTURES FOR CONSTRUCTIVE AUTOMOBILE ROAD AND STREET PAVEMENTS

    Directory of Open Access Journals (Sweden)

    V. A. Verenko

    2009-01-01

    Full Text Available The paper describes a methodology for evaluation of technical and economic efficiency of asphalt concrete mixture components. The method allows to perform a directed search for new materials which are used for mixture preparation and it also provides an efficient use of monetary funds. Firstly, it is possible to obtain this result due to optimum price-quality ratio of asphalt mixture which is determined by its service life in a pavement; secondly, it is possible to obtain this result due to  exclusion of errors while selecting components of the asphalt mixture out of the whole range applied presently in the world practice.

  3. Building Asphalt Pavement with SBS-based Compound Added Using a Dry Process in Greenland

    DEFF Research Database (Denmark)

    Lee, Hosin; Kim, Yongjoo; Geisler, Nivi

    2009-01-01

    heavy traffic and severe weather conditions in Greenland. Based on the initial set of strain data collected under the slow-moving loader right after construction, the highest strain value was observed from the test section with the highest amount of SBS-based compound. The increased amount of SBS......-based compound seemed to affect the asphalt mix to become more flexible under the heavy loads. By adding SBS-based compound to asphalt mixtures using a “dry” process, it is expected that the pavement would become more resistant to rutting than a typical asphalt mixture used in Greenland while enduring its arctic...... weather....

  4. Modification of local asphalt with epoxy resin to be used in pavement

    Directory of Open Access Journals (Sweden)

    A.M.M. Abd El Rahman

    2012-12-01

    Full Text Available The durability of asphalt pavement is greatly influenced by the environmental changes during the year. In this paper, we prepared asphalt modified by mixing asphalt 60/70 with epoxidized natural rubber (ENR in different percentages (5, 10 and 15%, which was achieved using preformed peracetic acid (aqueous solution 59% at 60–80 °C, then molten cross-linker maleic anhydride (MA was added to modified asphalt until homogenous blends are achieved. Marshall test was used to evaluate the asphalt pavement performance depending on the curing time and hardener concentration. To measure marshall test, the pervious mixture was stirred with aggregate jop formula mix (JMF and 40% MA at 150–170 °C for 20 h and 1600 rpm. From the obtained data, it was found that asphalt mixed with 15% of ENR + 40% MA achieves a high stability (16,632 Newton, air voids of 2.5%, flow of 2.9 mm and mineral voids of 14.6%. While, the stability of the unmodified asphalt was (11,500 Newton, the flow 3.2 mm, the suitable air void value was 3.7% at 5.5% with the same conditions.

  5. Use of Reclaimed Asphalt Pavement in Conjunction with Ground Improvement: A Case History

    Directory of Open Access Journals (Sweden)

    Kevin C. Foye

    2011-01-01

    Full Text Available The use of Reclaimed Asphalt Pavement (RAP in lieu of virgin crushed stone aggregate is becoming a widely accepted practice for a number of construction applications, particularly pavement base courses. A number of laboratory RAP studies have considered the mechanical properties of RAP bases in order to support pavement designs incorporating RAP. These studies have revealed a number of interesting relationships between RAP moisture content, compaction, and stiffness. This paper discusses the experiences of a design-build contractor integrating a geosynthetic ground improvement program with a RAP base during the reconstruction of a 1.95 ha asphalt parking lot. Field observations of base course construction with RAP explore some of the implications of laboratory findings. A number of interesting observations on the technical, construction, and economic issues resulting from the project challenges and the use of RAP are presented.

  6. Dynamic response of concrete pavement structure with asphalt isolating layer under moving loads

    Directory of Open Access Journals (Sweden)

    Jianmin Wu

    2014-12-01

    Full Text Available A three-dimensional finite element model (3D FEM is built using ABAQUS to analyze the dynamic response of a concrete pavement structure with an asphalt isolating layer under moving loads. The 3D model is prepared and validated in the state of no asphalt isolating layer. Stress and deflection at the critical load position are calculated by changing thickness, modulus of isolating layer and the combination between the isolating layer and concrete slab. Analysis result shows that the stress and deflection of the concrete slab increase with the increase of thickness. The stress and deflection of the concrete slab decrease with the increase of combination between the isolating layer and concrete slab. The influence of changing the isolating layer modulus to the stress and deflection of the concrete slab is not significant. From the results, asphalt isolating layer design is suggested in concrete pavement.

  7. Numerical modeling of inelastic structures at loading of steady state rolling. Thermo-mechanical asphalt pavement computation

    Science.gov (United States)

    Wollny, Ines; Hartung, Felix; Kaliske, Michael

    2016-05-01

    In order to gain a deeper knowledge of the interactions in the coupled tire-pavement-system, e.g. for the future design of durable pavement structures, the paper presents recent results of research in the field of theoretical-numerical asphalt pavement modeling at material and structural level, whereby the focus is on a realistic and numerically efficient computation of pavements under rolling tire load by using the finite element method based on an Arbitrary Lagrangian Eulerian (ALE) formulation. Inelastic material descriptions are included into the ALE frame efficiently by a recently developed unsplit history update procedure. New is also the implementation of a viscoelastic cohesive zone model into the ALE pavement formulation to describe the interaction of the single pavement layers. The viscoelastic cohesive zone model is further extended to account for the normal pressure dependent shear behavior of the bonding layer. Another novelty is that thermo-mechanical effects are taken into account by a coupling of the mechanical ALE pavement computation to a transient thermal computation of the pavement cross-section to obtain the varying temperature distributions of the pavement due to climatic impact. Then, each ALE pavement simulation considers the temperature dependent asphalt material model that includes elastic, viscous and plastic behavior at finite strains and the temperature dependent viscoelastic cohesive zone formulation. The temperature dependent material parameters of the asphalt layers and the interfacial layers are fitted to experimental data. Results of coupled tire-pavement computations are presented to demonstrate potential fields of application.

  8. Development of a Full-Depth Wheel Tracking Test for Asphalt Pavement Structure: Methods and Performance Evaluation

    OpenAIRE

    Hui Wang; Zepeng Fan; Jiupeng Zhang

    2016-01-01

    The rutting performance of asphalt pavement structure relies on the high temperature properties of asphalt mixture as well as the pavement structure and thickness. In order to investigate the influence of the structure and thickness, a full-depth wheel tracking test is developed in this research by improving the conventional wheel tracking test apparatus. The newly proposed test method is capable of varying its load speed and load size, controlling its specimen temperature gradient, and simul...

  9. Dynamic Properties of Footbridges: Influence of Asphalt Pavement and Support Conditions

    Directory of Open Access Journals (Sweden)

    Weber Benedikt

    2015-01-01

    Full Text Available Natural frequencies and damping ratios are important parameters in the design of footbridges against vibrations. Although not normally considered in calculations, non-structural elements such as the asphalt pavement and the supports can have a significant influence on the dynamic properties. In this article we present results from vibration tests conducted on four footbridges over the last few years covering a wide range of asphalt temperatures. The experiments show that both the natural frequencies and the damping ratios can change significantly with temperature. In one particular case, a variation in natural frequency of 25% has been observed between high and low asphalt temperatures. An additional damping of around 1% due to the asphalt pavement has been detected. To more clearly understand the experimental results, the bridges were also analysed numerically using a visco-elastic material for the asphalt. The analysis of the experimental results also revealed that other non-structural elements can have a large influence on dynamic properties of bridges. In two cases, the supports did not perform as expected and lead to surprising results.

  10. Certification Tests on Cold Patch Asphalt Repair Materials for Use in Airfield Pavements

    Science.gov (United States)

    2010-06-01

    was then applied for 60 sec to the specimens, and the deviator stress of 90 psi was applied. The test was terminated when 4% strain was reached or... pavements . ERDC-GSL TR-05-07. Vicksburg, MS: U.S. Army Engineer Research and Development Center. U.S. Air Force. 2008a. Testing protocol for rigid spall...ER D C/ G SL T R- 10 -1 4 Certification Tests on Cold Patch Asphalt Repair Materials for Use in Airfield Pavements G eo te ch ni

  11. Sustainable asphalt pavement: Application of slaughterhouse waste oil and fly ash in asphalt binder

    Science.gov (United States)

    Sanchez Ramos, Jorge Luis

    Increasing energy costs, lack of sufficient natural resources and the overwhelming demand for petroleum has stimulated the development of alternative binders to modify or replace petroleum-based asphalt binders. In the United States, the petroleum-based asphalt binder is mainly used to produce the Hot Mix Asphalt (HMA). There are approximately 4000 asphalt plants that make 500 million tons of asphalt binder valued at roughly 3 billion/year. The instability of the world's oil market has pushed oil prices to more than 80 per barrel in 2012, which increased the cost of asphalt binder up to $570 per ton. Therefore, there is a timely need to find alternative sustainable resources to the asphalt binder. This paper investigates the possibility of the partial replacement of the asphalt binder with slaughterhouse waste and/or fly ash. In order to achieve this objective, the asphalt binder is mixed with different percentages of waste oil and/or fly ash. In order to investigate the effect of these additives to the performance of the asphalt binder, a complete performance grade test performed on multiple samples. The results of the performance grade tests are compared with a control sample to observe how the addition of the waste oil and/or fly ash affects the sample. Considering the increasing cost and demand of asphalt, the use of slaughterhouse waste oil and/or fly ash as a partial replacement may result in environmental and monetary improvements in the transportation sector.

  12. Work Plan for: "Investigation of Noise, Durability, Permeability and Friction Performance Trends for Asphaltic Pavement Surface Types," PPRC Strategic Plan Item 4.16

    OpenAIRE

    Harvey, John T

    2005-01-01

    The central purpose of this research is to support the Caltrans Quiet Pavement Pilot Program. The research conforms with FHWA guidance provided to State DOTs that conduct tire/pavement noise research. The broader purpose of this research is to support the Caltrans Quieter Pavements Road Map and Work Plan, with goals and objectives that address quiet as well as permeable asphalt surfaces for pavements. Results from this research will identify best practice for selecting asphaltic surf...

  13. Study of the Raveling Resistance of Porous Asphalt Pavements Used in Sustainable Drainage Systems Affected by Hydrocarbon Spills

    Directory of Open Access Journals (Sweden)

    Jorge Rodriguez-Hernandez

    2015-12-01

    Full Text Available Permeable pavements are one of the most commonly-used sustainable drainage systems (SuDS in urban areas for managing stormwater runoff problems. Porous asphalt is widely used in surface layers of permeable pavement systems, where it can suffer from accidental oil spills from vehicles. Oil spills affect bituminous mixes through the solvent action of the hydrocarbons on the bitumen, reducing the raveling resistance of asphalt pavements. In order to assess the raveling resistance in porous asphalt pavements, the Cantabro abrasion test was performed on 200 test samples after applying controlled oil spills. Three different types of binders were used: conventional bitumen, polymer-modified bitumen and special fuel-resistant bitumen. After analyzing the results, it was concluded that the most suitable bitumen to protect against oil leakages is the polymer-modified one, which is far better than the other two types of bitumen tested.

  14. Energy consumption comparison for different asphalt pavements rehabilitation techniques used in Chile

    Energy Technology Data Exchange (ETDEWEB)

    Thenoux, Guillermo; Dowling, Rafael [School of Engineering, Universidad Catolica de Chile, Vicuna Mackenna 4860 Macul, Santiago (Chile); Gonzalez, Alvaro [Department of Civil Engineering, University of Canterbury, Private Bag 4800, Christchurch 8020 (New Zealand)

    2007-02-15

    In developing countries without the availability of reliable pavement management systems, recycling techniques may offer the best alternative for pavement structural rehabilitation. However, for many government officials and contractors there is a clear understanding of the technical advantages of recycling but not a clear perspective of cost saving. Since cost is a relative value among different regions of any country the following work makes an energy analysis of the construction process of the three different rehabilitation techniques available in Chile. Three different structural pavement rehabilitation alternatives were studied and compared using an energy consumption methodology: circle Asphalt overlay; circle Reconstruction; circle Cold in place recycling with foamed asphalt. The methodology considers different project scenarios by combining expected traffic and soil support values. For each rehabilitation technique and scenario, the construction processes were analyzed and the design layers were transformed to equivalent energy units (MJ/m{sup 2}). Results show that cold in place recycling utilizes the lowest amount of energy compared with reconstruction or an asphalt overlay in all the scenarios studied, producing more differences when rehabilitating roads for less trafficked roads. The study also concludes that aggregate haulage distance is the most sensitive factor on total energy consumption when comparing the three alternatives. (author)

  15. Strain transfer analysis of optical fiber based sensors embedded in an asphalt pavement structure

    Science.gov (United States)

    Wang, Huaping; Xiang, Ping

    2016-07-01

    Asphalt pavement is vulnerable to random damage, such as cracking and rutting, which can be proactively identified by distributed optical fiber sensing technology. However, due to the material nature of optical fibers, a bare fiber is apt to be damaged during the construction process of pavements. Thus, a protective layer is needed for this application. Unfortunately, part of the strain of the host material is absorbed by the protective layer when transferring the strain to the sensing fiber. To account for the strain transfer error, in this paper a theoretical analysis of the strain transfer of a three-layered general model has been carried out by introducing Goodman’s hypothesis to describe the interfacial shear stress relationship. The model considers the viscoelastic behavior of the host material and protective layer. The effects of one crack in the host material and the sensing length on strain transfer relationship are been discussed. To validate the effectiveness of the strain transfer analysis, a flexible asphalt-mastic packaged distributed optical fiber sensor was designed and tested in a laboratory environment to monitor the distributed strain and appearance of cracks in an asphalt concrete beam at two different temperatures. The experimental results indicated that the developed strain transfer formula can significantly reduce the strain transfer error, and that the asphalt-mastic packaged optical fiber sensor can successfully monitor the distributed strain and identify local cracks.

  16. Design tool for the thermal energy potential of asphalt pavements

    NARCIS (Netherlands)

    Loomans, M.G.L.C.; Oversloot, H.P.; Bondt, A. de; Jansen, R.; Rij, H. van

    2003-01-01

    This paper describes the development of a design tool for the calculation of the thermal energy potential of a so-called asphalt collector. Two types of numerical models have been developed and validated against experimental results from a full-scale test-site. The validation showed to be a tedious

  17. Sulfur extended asphalt pavement evaluation in the State of Washington: SR 270 highway pavement performance report

    Science.gov (United States)

    Mahoney, J. P.; Terrel, R. L.; Cook, J. C.

    1982-11-01

    The placement and performance of sulfur extended asphalt (SEA) paving mixtures at a highway test site (SR 270) near Pullman, Washington is summarized. The mixture and structural designs and construction details are included. This is followed by a discussion of the data collection and analysis accomplished over a three year evaluation period (1979-1982). A major experimental feature of the study was the use of 0.100 (conventional asphalt concrete), 30/70 and 40/60 SEA binder ratios (sulfur/asphalt ratios are expressed as weight percents in the experimental paving mixtures.

  18. The Quality Control of Asphalt Pavement Construction%沥青路面施工质量控制

    Institute of Scientific and Technical Information of China (English)

    2013-01-01

    The quality control of asphalt pavement constru-ction is an important link in the construction of highway proj-ect, is the key to the construction engineering quality. The aut-hor had more time in ten years to engage in the work of the qu-ality control of asphalt pavement construction, realized our cu-rrent level of quality control in asphalt pavement construction is also difficult to adapt to requirements of the design of asph-alt pavement structure, stil need to be improved. Through this article the author discusses how to improve the construction q-uality control of asphalt pavement.%  沥青路面施工质量控制是公路工程施工中的一个重要环节,是决定工程建设质量的关键。笔者十多年来有较多时间从事沥青路面施工质量控制工作,体会到我们目前沥青路面施工的质量控制水平还难以适应沥青路面结构设计要求,还有待提高。笔者通过本文浅谈如何提高沥青路面的施工质量控制工作。

  19. Sensitivity analysis of longitudinal cracking on asphalt pavement using MEPDG in permafrost region

    Directory of Open Access Journals (Sweden)

    Chen Zhang

    2015-02-01

    Full Text Available Longitudinal cracking is one of the most important distresses of asphalt pavement in permafrost regions. The sensitivity analysis of design parameters for asphalt pavement can be used to study the influence of every parameter on longitudinal cracking, which can help optimizing the design of the pavement structure. In this study, 20 test sections of Qinghai–Tibet Highway were selected to conduct the sensitivity analysis of longitudinal cracking on material parameter based on Mechanistic-Empirical Pavement Design Guide (MEPDG and single factorial sensitivity analysis method. Some computer aided engineering (CAE simulation techniques, such as the Latin hypercube sampling (LHS technique and the multiple regression analysis are used as auxiliary means. Finally, the sensitivity spectrum of material parameter on longitudinal cracking was established. The result shows the multiple regression analysis can be used to determine the remarkable influence factor more efficiently and to process the qualitative analysis when applying the MEPDG software in sensitivity analysis of longitudinal cracking in permafrost regions. The effect weights of the three parameters on longitudinal cracking in descending order are air void, effective binder content and PG grade. The influence of air void on top layer is bigger than that on middle layer and bottom layer. The influence of effective asphalt content on top layer is bigger than that on middle layer and bottom layer, and the influence of bottom layer is slightly bigger than middle layer. The accumulated value of longitudinal cracking on middle layer and bottom layer in the design life would begin to increase when the design temperature of PG grade increased.

  20. Respirable crystalline silica exposures during asphalt pavement milling at eleven highway construction sites.

    Science.gov (United States)

    Hammond, Duane R; Shulman, Stanley A; Echt, Alan S

    2016-07-01

    Asphalt pavement milling machines use a rotating cutter drum to remove the deteriorated road surface for recycling. The removal of the road surface has the potential to release respirable crystalline silica, to which workers can be exposed. This article describes an evaluation of respirable crystalline silica exposures to the operator and ground worker from two different half-lane and larger asphalt pavement milling machines that had ventilation dust controls and water-sprays designed and installed by the manufacturers. Manufacturer A completed milling for 11 days at 4 highway construction sites in Wisconsin, and Manufacturer B completed milling for 10 days at 7 highway construction sites in Indiana. To evaluate the dust controls, full-shift personal breathing zone air samples were collected from an operator and ground worker during the course of normal employee work activities of asphalt pavement milling at 11 different sites. Forty-two personal breathing zone air samples were collected over 21 days (sampling on an operator and ground worker each day). All samples were below 50 µg/m(3) for respirable crystalline silica, the National Institute for Occupational Safety and Health recommended exposure limit. The geometric mean personal breathing zone air sample was 6.2 µg/m(3) for the operator and 6.1 µg/m(3) for the ground worker for the Manufacturer A milling machine. The geometric mean personal breathing zone air sample was 4.2 µg/m(3) for the operator and 9.0 µg/m(3) for the ground worker for the Manufacturer B milling machine. In addition, upper 95% confidence limits for the mean exposure for each occupation were well below 50 µg/m(3) for both studies. The silica content in the bulk asphalt material being milled ranged from 7-23% silica for roads milled by Manufacturer A and from 5-12% silica for roads milled by Manufacturer B. The results indicate that engineering controls consisting of ventilation controls in combination with water-sprays are

  1. Assessment of the aging level of rejuvenated hot mixed asphalt concrete pavements

    Science.gov (United States)

    McGovern, Megan; Buttlar, William G.; Reis, Henrique

    2016-04-01

    The efficacy of asphalt rejuvenator on restoring the properties of oxidatively aged asphalt was tested via a non-collinear ultrasonic subsurface wave mixing technique modified for field use. Longitudinal transducers were mounted on angle wedges to generate subsurface dilatational waves to allow for pavement evaluation when there is only access to one side. Because in the field the asphalt concrete (AC) pavement properties (i.e., ultrasonic velocities and attenuations) are unknown, a pre-determined fixed incident angle (based on the AC mixture type) was used, which allows for practical implementation in the field. Oxidative aged AC specimens were coated with rejuvenator (10% by weight of the binder) and left to dwell for varying amounts of time. Once the dwell time reached the desired amount, the specimen was immediately ultrasonically tested. The frequency ratio, f2/f1, at which the interaction took place and the normalized nonlinear wave generation parameter, β/β0, were recorded and compared against a reference plot. It was observed that the rejuvenator had the effect of restoring the nonlinear properties to those corresponding to a virgin sample after a sufficient amount of dwell time. The ability of the rejuvenator to fully penetrate and act on the binder was observed to be dependent on the porosity and aggregate structure, and thus varied for each specimen. As a result, some portions of the binder were restored to a greater extent than others. This non-uniform nature was captured via the nonlinear ultrasonic technique.

  2. Effects of Asphalt Mix Design Properties on Pavement Performance: A Mechanistic Approach

    Directory of Open Access Journals (Sweden)

    Ahmad M. Abu Abdo

    2016-01-01

    Full Text Available The main objective of this study was to investigate the effects of hot mix asphalt material properties on the performance of flexible pavements via mechanistic approach. 3D Move Analysis software was utilized to determine rutting and cracking distresses in an asphalt concrete (AC layer. Fourteen different Superpave mixes were evaluated by utilizing results of the Dynamic Modulus (|E⁎| Test and the Dynamic Shear Modulus (|G⁎| Test. Results showed that with the increase of binder content, the tendency of rutting in AC layer increased. However, with the increase of binder content, the cracking of AC layer lessened. Furthermore, when different binder grades were evaluated, results showed that with the increase of the upper binder grade number, rutting decreased, and with the increase of the lower binder grade number, rutting increased. Furthermore, analysis showed that with the increase of the lower binder grade number, higher percent of bottom up cracks would result. As a result of the analysis, binder grade should not be solely considered for cracking in AC layer; binder content and aggregate structure play a big role. Finally, results illustrated that the mechanistic approach is a better tool to determine the performance of asphalt pavement than commonly used methods.

  3. 高速公路沥青路面病害分析%Analysis on highway asphalt pavement disease

    Institute of Scientific and Technical Information of China (English)

    李宏伟

    2012-01-01

    针对高速公路沥青路面中常见的沉陷、水毁、裂缝等病害进行了分析,阐述了各种病害产生的原因,指出沥青路面产生病害既有设计方面的原因,也有施工方面的原因,所以应优化设计,并加强施工管理,以提高沥青路面使用性能。%This article analyzes the settlement,water damage,and cracks and other diseases on highway asphalt pavement,describes causes of diseases,and points out the causes of asphalt pavement diseases in both design and construction aspect.So the design should be optimized,and the construction management should be enhanced,so as to improve the asphalt pavement performance.

  4. On the Conservation and Recycled Asphalt Pavement%论沥青路面的养护与再生

    Institute of Scientific and Technical Information of China (English)

    韩建忠

    2014-01-01

    简要论述了沥青路面养护和再生的方法,并介绍了国内外沥青路面的养护和再生情况,以期为相关单位提供较为全面的参考。%This paper discusses the asphalt pavement maintenance and regeneration methods, and describes the conservation and regeneration of asphalt pavement at home and abroad, in order to provide a more comprehensive reference for relevant units.

  5. Cause Analysis of Asphalt Concrete Pavement Disease%沥青路面病害的成因分析

    Institute of Scientific and Technical Information of China (English)

    高雪

    2013-01-01

    From raw materials selection, structure design and construction of asphalt concrete pavement, the article made a detailed description on disease types, causes and prevention measures of the asphalt concrete pavement.%  文章从沥青混凝土路面的原材料选择、结构设计、施工等方面入手,对沥青混凝土路面病害的类型、发生原因及防治措施进行详细说明。

  6. Full-Depth Pavement Reclamation with Foamed Asphalt: First-Level Analysis Report on HVS Testing on State Route 89

    OpenAIRE

    Theyse, Hecter; Long, Fenella; Jones, David; Harvey, John T

    2006-01-01

    This report focuses on the HVS testing of a foamed asphalt treated, reclaimed asphalt pavement (RAP) on State Route 89 near Sierraville. The report discusses the expected behavior of the HVS test sections, presents the results from field surveys done during June 2003, October 2003 and May 2004 as well as the 1st level analysis of HVS results from the test site. Results from field surveys done prior to, during and after HVS testing show that the pavement structure of the HVS test sections on S...

  7. Performance Evaluation of Crumb Rubber Modified Stone Mastic Asphalt Pavement in Malaysia

    Directory of Open Access Journals (Sweden)

    Nuha Salim Mashaan

    2013-01-01

    Full Text Available To prevent pavement distresses there are various solutions such as adopting new mix designs or utilisation of asphalt additives. The primary aim of this study was to investigate the effect of adding crumb tyre rubber as an additive to SMA mixture performance properties. This study investigated the essential aspects of modified asphalt mixtures in order to better understand the influence of CRM modifiers on volumetric, mechanical, and stiffness properties of SMA mixture. In this study, virgin bitumen 80/100 penetration grade was used, modified with crumb rubber (CRM at five different modification levels, namely, 6%, 12%, 16%, and 20%, respectively, by weight of the bitumen. The appropriate amount of the added CRM was found to be 12% by weight of bitumen. This percentage results in the maximum level of stability. The resilient modulus (Mr of modified SMA samples including different percentages of CRM was obviously higher in comparison with that of unmodified samples.

  8. Road Performance of Drainage Asphalt Pavement%排水沥青路面的路用性能

    Institute of Scientific and Technical Information of China (English)

    连艳霞

    2014-01-01

    Drainage asphalt pavement has features such as drainage, anti-slip and noise reduction. It can greatly improve driving safety and reduce the incidence of traffic accidents. In order to study its road per-formance, contrast tests on road performance of mixtures with different types of gradation, different as-phalt as well as same gradation types, different asphalt are conducted. The result shows that polymer modi-fied asphalt has better high temperature performance and dynamic viscosity than asphalt A and drainage asphalt pavement has excellent road performance than OGFC asphalt mixture.%排水沥青路面具有排水、防滑和降噪等功能,可提高行车安全性,降低交通事故率。为研究其路用性能,通过进行不同级配类型、不同沥青和相同级配类型、不同沥青的混合料路用性能的对比试验,结果表明,聚合物复合改性沥青的高低温性能及动力黏度优于高黏沥青A,排水沥青路面混合料路用性能优于开级配OGFC混合料的路用性能。

  9. Artificial intelligence modeling to evaluate field performance of photocatalytic asphalt pavement for ambient air purification.

    Science.gov (United States)

    Asadi, Somayeh; Hassan, Marwa; Nadiri, Ataallah; Dylla, Heather

    2014-01-01

    In recent years, the application of titanium dioxide (TiO₂) as a photocatalyst in asphalt pavement has received considerable attention for purifying ambient air from traffic-emitted pollutants via photocatalytic processes. In order to control the increasing deterioration of ambient air quality, urgent and proper risk assessment tools are deemed necessary. However, in practice, monitoring all process parameters for various operating conditions is difficult due to the complex and non-linear nature of air pollution-based problems. Therefore, the development of models to predict air pollutant concentrations is very useful because it can provide early warnings to the population and also reduce the number of measuring sites. This study used artificial neural network (ANN) and neuro-fuzzy (NF) models to predict NOx concentration in the air as a function of traffic count (Tr) and climatic conditions including humidity (H), temperature (T), solar radiation (S), and wind speed (W) before and after the application of TiO₂ on the pavement surface. These models are useful for modeling because of their ability to be trained using historical data and because of their capability for modeling highly non-linear relationships. To build these models, data were collected from a field study where an aqueous nano TiO₂ solution was sprayed on a 0.2-mile of asphalt pavement in Baton Rouge, LA. Results of this study showed that the NF model provided a better fitting to NOx measurements than the ANN model in the training, validation, and test steps. Results of a parametric study indicated that traffic level, relative humidity, and solar radiation had the most influence on photocatalytic efficiency.

  10. 沥青砼路面裂缝预防措施%Prevention Measures on the Asphalt Concrete Pavement Crevices

    Institute of Scientific and Technical Information of China (English)

    贾陇春

    2014-01-01

    文章简单介绍了沥青砼路面裂缝的集中类型,对沥青砼路面产生裂缝的原因进行了分析,着重提出了相应的沥青砼路面裂缝预防措施。希望能进一步延长沥青砼路面的使用寿命,提升路面服务质量,为工程技术人员提供一定的参考和借鉴。%This paper briefly introduces the main types of asphalt concrete pavement crevices and analyzed the causes of crevices, focusing on corresponding prevention measures. By this, the author hoped to further extend the service life of asphalt concrete pavement and improved the pavement quality, providing a reference for engineering and technical personnel.

  11. 分析沥青路面的再生利用%Analysis of the Recycled Asphalt Pavement

    Institute of Scientific and Technical Information of China (English)

    谭杨武

    2013-01-01

    This article mainly analyzes the application status of old asphalt pavement recycling and elaborates the principl-e, then makes some discussion on the asphalt recycling techno-logy to provide some asphalt pavement recycling worth learn-ing approaches for the sake of our country.%本文主要分析了旧沥青路面再生的应用现状,并且阐述了沥青路面再生的原理,从而对沥青再生技术进行了一些讨论,为求给我国的沥青路面再生提供一些值得借鉴的方法。

  12. Performances and Durability of Asphalt Mixtures Made with Reclaimed Asphalt Pavement

    OpenAIRE

    Noferini, Luca

    2016-01-01

    According to most recent surveys, 265 mil tonnes of asphalt for road applications were produced in the European area in 2014. In the same year, the amount of available RAP was more than 50 mil tonnes. The use of RAP in new blended mixes reduces the need of neat bitumen, making RAP recycling economically attractive. In spite of its economic and environmental benefits, the use of RAP is often subjected to restrictive policies pursued by agencies due to uncertainty related to RAP mixes field per...

  13. Effects of asphalt rejuvenator on thermal and mechanical properties on oxidized hot mixed asphalt pavements

    Science.gov (United States)

    Farace, Nicholas A.; Buttlar, William G.; Reis, Henrique

    2016-04-01

    The utilization of asphalt rejuvenator, and its effectiveness for restoring thermal and mechanical properties was investigated via Disk-shaped Compact Tension (DC(T)) and acoustic emission (AE) testing for determining mechanical properties and embrittlement temperatures of the mixtures. During the DC(T) testing the fracture energies and peak loads were used to measure the resistance of the rejuvenated asphalt to low temperature cracking. The AE testing monitored the acoustic emission activity while the specimens were cooled from room temperature to -40 °C to estimate the temperature at which thermal cracking began (i.e. the embrittlement temperature). First, a baseline response was obtained by obtaining the mechanical and thermal response of virgin HMA samples and HMA samples that had been exposed to oxidative aging for 36 hours at 135°C. The results showed the virgin samples had much higher peak loads and fracture energies than the 36 hours aged samples. Acoustic Emission showed similar results with the virgin samples having embrittlement temperatures 10 °C cooler than the 36 hours aged specimens. Then, overaged for 36 hours specimens were treated different amounts of rejuvenator (10%, 15%, and 20% by weight of binder content) and left to dwell for increased amount of time periods varying from one to eight weeks. It was observed that the AE results showed an improvement of embrittlement temperature with increasing with the dwell times. The 8 weeks specimens had cooler embrittlement temperatures than the virgin specimens. Finally, the low temperature effects on fracture energy and peak load of the rejuvenated asphalt was investigated. Rejuvenator was applied (10% by weight of binder) to specimens aged 36 hours at 135 °C, and the dwell time was varied from 1 to 4 weeks. The results showed that the peak loads were restored to levels of the virgin specimens, and the fracture energies improved to levels beyond that of the virgin specimens. The results also showed a

  14. Research on Structure Combination of Long Life Asphalt Pavement%长寿命沥青路面结构组合分析

    Institute of Scientific and Technical Information of China (English)

    高曙光; 武庆锋

    2012-01-01

    The paper advanced 3 indexes for the design of long life asphalt pavements: maximal tension strain at the bottom of asphalt pavement, maximal compression strain at the top of subgrade and rutting depth of asphalt pavements. Afterwards, it analyzed 5 long We asphalt pavement structures, including long life asphalt pavements with flexible base and long life asphalt pavements with semi-rigid base, and real parameters were used in the analysis. Finally, checking computations of the design indexes were done based on the results. The analysis indicated that, the location of maximum tension strain of long life asphalt pavements with semi-rigid base is near the top of asphalt pavement, but the location of maximum tension strain of long life asphalt pavements with flexible base is at the bottom of asphalt pavement; and the shear stress distribution is also different in the 2 kinds of pavements.%提出了寿命沥青路面的设计指标:沥青层底最大拉应变、土基顶面最大压应变及考虑路面抗剪能力的路面结构车辙深度;同时采用三维有限元方法对半刚性基层及柔性基层两种形式的长寿路面结构进行分析,分析中材料参数采用路面各结构层的实测结构模量,最后根据力学分析结果对拟定结构的设计指标进行验算.分析结果表明,半刚性基层长寿路面最大拉应变发生在沥青层硕面附近,而柔性基层路面最大拉应变出现在沥青层底面,剪应力在两种形式长寿路面中的分布形式也有很大差别.

  15. 论沥青路面早期损坏的预防措施%Discussion on prevention measures of early damages of asphalt pavement

    Institute of Scientific and Technical Information of China (English)

    汪香莲

    2011-01-01

    Combining with the present asphalt concrete pavement construction and caused pavement early damages,this paper analysed the reasons and preventive measures of pavement early damages from pavement structure layer,mixing ratio design,raw materials,construction control and other aspects,in order to reduce the early damage of asphalt pavement,prolong the service life of pavement.%结合当前沥青混凝土路面施工及产生的路面早期破坏,从路面结构层、配合比设计、原材料、施工控制等方面分析了路面早期破坏的原因及预防措施,以减少沥青路面早期损坏,延长路面使用寿命。

  16. Laboratory and field evaluation of hot mix asphalt with high contents of reclaimed asphalt pavement

    Science.gov (United States)

    Van Winkle, Clinton Isaac

    Currently in Iowa, the amount of RAP materials allowed for the surface layer is limited to 15% by weight. The objective of this project was to develop quality standards for inclusion of RAP content higher than 15% in asphalt mixtures. To meet Superpave mix design requirements, it was necessary to fractionate the RAP materials. Based on the extensive sieve-by-sieve analysis of RAP materials, the optimum sieve size to fractionate RAP materials was identified. To determine if the higher percentage of RAP materials than 15% can be used in Iowa's state highway, three test sections with 30.0%, 35.5% and 39.2% of RAP materials were constructed on Highway 6 in Iowa City. The construction of the field test sections was monitored and the cores were obtained to measure field densities of test sections. Field mixtures collected from test sections were compacted in the laboratory in order to test the moisture sensitivity using a Hamburg Wheel Tracking Device. The binder was extracted from the field mixtures with varying amounts of RAP materials and tested to determine the effects of RAP materials on the PG grade of a virgin binder. Field cores were taken from the various mix designs to determine the percent density of each test section. A condition survey of the test sections was then performed to evaluate the short-term performance.

  17. Performance of RAP in the System of Cold Inplace Recycling of Asphalt Pavement

    Institute of Scientific and Technical Information of China (English)

    MA Baoguo; WANG Haifeng; WEI Dingbang

    2011-01-01

    The property of reclaimed asphalt pavement(RAP) mixture will be affected mainly by composition of old asphalt/soil and cement content in CIR system.We studied the relationship between A/S and cementitious materials.It showed that if there was no soil in RAP,the unconfined compressive strength was only from 0.18 MPa to 1.07 MPa even if adding cement was from 2% to 6%,and RAP samples collapsed during conserving in water.The optimum water content rose from 6.5% to 11% with the declining of A/S from S=0 to A/S=1/5.Five RAP samples all got the maximum compressive strength when A/S=5/5,and the maximum compressive strength of the samples adding 6% cement was 3.17 MPa.It showed that the capacity of RAP was not only affected by A/S,but also by the content of cement.The dynamic modulus of RAP will increase with the rise of loading frequency and decrease with the temperature rising.SEM test showed that C-S-H interlacing formed the netted structure,and it enwrapped the aggregate and improved the strength of RAP.

  18. Recycled asphalt pavement - fly ash geopolymers as a sustainable pavement base material: Strength and toxic leaching investigations.

    Science.gov (United States)

    Hoy, Menglim; Horpibulsuk, Suksun; Rachan, Runglawan; Chinkulkijniwat, Avirut; Arulrajah, Arul

    2016-12-15

    In this research, a low-carbon stabilization method was studied using Recycled Asphalt Pavement (RAP) and Fly Ash (FA) geopolymers as a sustainable pavement material. The liquid alkaline activator (L) is a mixture of sodium silicate (Na2SiO3) and sodium hydroxide (NaOH), and high calcium FA is used as a precursor to synthesize the FA-RAP geopolymers. Unconfined Compressive Strength (UCS) of RAP-FA blend and RAP-FA geopolymer are investigated and compared with the requirement of the national road authorities of Thailand. The leachability of the heavy metals is measured by Toxicity Characteristic Leaching Procedure (TCLP) and compared with international standards. The Scanning Electron Microscopy (SEM) analysis of RAP-FA blend indicates the Calcium Aluminate (Silicate) Hydrate (C-A-S-H) formation, which is due to a reaction between the high calcium in RAP and high silica and alumina in FA. The low geopolymerization products (N-A-S-H) of RAP-FA geopolymer at NaOH/Na2SiO3=100:0 are detected at the early 7days of curing, hence its UCS is lower than that of RAP-FA blend. The 28-day UCS of RAP-FA geopolymers at various NaOH/Na2SiO3 ratios are significantly higher than that of the RAP-FA blend, which can be attributed to the development of geopolymerization reactions. With the input of Na2SiO3, the highly soluble silica from Na2SiO3 reacted with leached silica and alumina from FA and RAP and with free calcium from FA and RAP; hence the coexistence of N-A-S-H gel and C-A-S-H products. Therefore, the 7-day UCS values of RAP-FA geopolymers increase with decreasing NaOH/Na2SiO3 ratio. TCLP results demonstrated that there is no environmental risk for both RAP-FA blends and RAP-FA geopolymers in road construction. The geopolymer binder reduces the leaching of heavy metal in RAP-FA mixture. The outcomes from this research will promote the move toward increased applications of recycled materials in a sustainable manner in road construction.

  19. Utilize Cementitious High Carbon Fly Ash (CHCFA) to Stabilize Cold In-Place Recycled (CIR) Asphalt Pavement as Base Coarse

    Energy Technology Data Exchange (ETDEWEB)

    Wen, Haifang; Li, Xiaojun; Edil, Tuncer; O' Donnell, Jonathan; Danda, Swapna

    2011-02-05

    The purpose of this study was to evaluate the performance of cementitious high carbon fly ash (CHCFA) stabilized recycled asphalt pavement as a base course material in a real world setting. Three test road cells were built at MnROAD facility in Minnesota. These cells have the same asphalt surface layers, subbases, and subgrades, but three different base courses: conventional crushed aggregates, untreated recycled pavement materials (RPM), and CHCFA stabilized RPM materials. During and after the construction of the three cells, laboratory and field tests were carried out to characterize the material properties. The test results were used in the mechanistic-empirical pavement design guide (MEPDG) to predict the pavement performance. Based on the performance prediction, the life cycle analyses of cost, energy consumption, and greenhouse gasses were performed. The leaching impacts of these three types of base materials were compared. The laboratory and field tests showed that fly ash stabilized RPM had higher modulus than crushed aggregate and RPM did. Based on the MEPDG performance prediction, the service life of the Cell 79 containing fly ash stabilized RPM, is 23.5 years, which is about twice the service life (11 years) of the Cell 77 with RPM base, and about three times the service life (7.5 years) of the Cell 78 with crushed aggregate base. The life cycle analysis indicated that the usage of the fly ash stabilized RPM as the base of the flexible pavement can significantly reduce the life cycle cost, the energy consumption, the greenhouse gases emission. Concentrations of many trace elements, particularly those with relatively low water quality standards, diminish over time as water flows through the pavement profile. For many elements, concentrations below US water drinking water quality standards are attained at the bottom of the pavement profile within 2-4 pore volumes of flow.

  20. 沥青路面冷再生技术在路面维修中的应用%Application of Cold Recycling Technology of Asphalt Pavement in the Pavement Repair

    Institute of Scientific and Technical Information of China (English)

    冯国龙

    2014-01-01

    This paper analyzed several main causes of the damage of asphalt pavement and simply introduced the main techniques of the cold recycling technology of asphalt pave-ment. The author also introduced the concrete applying meth-ods of the cold regeneration technique of asphalt pavement in pavement repair.%本文针对沥青路面出现损坏的几个主要原因进行了分析,简单介绍了沥青路面冷再生技术的主要工艺,并且介绍了沥青路面冷再生技术在路面维修中的具体使用方法。

  1. 半刚性基层沥青路面常见病害分析%Analysis of semi-rigid base asphalt pavement diseases

    Institute of Scientific and Technical Information of China (English)

    李晗

    2011-01-01

    半刚性基层沥青路面是国内应用最广泛的路面类型。沥青路面受施工水平、路基强度、温度变化、水损害、交通量增长及超限车辆等因素的影响,易出现多种病害。本文分析了沥青路面常见病害及其形成原因,并提出了减少沥青路面病害的预防措施,为沥青路面养护提供决策依据。%Asphalt pavement with semi-rigid base is the most national widely used type of pavement. Subgrade of asphalt pavement many occur many diseases under the influence of construction level, strength, temperature changes, moisture damage, traffic growth and oversize vehicles. This article analyses the common diseases of asphalt pavement and its causes, and suggests reducing asphalt pavement disease prevention measures for asphalt pavement maintenance decision-making basis.

  2. Evaluation of the Pavement Quality Indicator (PQI for the on-site density measurement of asphalt emulsion mixes

    Directory of Open Access Journals (Sweden)

    Martínez-Echevarría, M. J.

    2013-03-01

    Full Text Available The Pavement Quality Indicator (PQI is a non-nuclear gauge used for the on-site density measurement of asphalt pavements without the need to extract core samples. Previous studies of hot asphalt mixes found that PQI density readings were very similar to laboratory density measurements of pavement cores. This paper describes the first stage of a research project whose objective is to analyze PQI density measurements of mixes manufactured with an asphalt emulsion binder. The PQI density variability for such mixes was verified and compared with the results obtained with other on-site methods for measuring pavement density.

    El equipo Pavement Quality Indicator es un dispositivo para la determinación de densidad in situ en pavimentos asfálticos sin extracción de testigos. Las experiencias con este equipo en mezclas bituminosas en caliente, recogidas en diferentes fuentes bibliográficas, muestran que las densidades medidas in situ con el PQI son muy similares a las obtenidas mediante la extracción de testigos. En este artículo se expone la primera etapa de un proyecto de investigación que tiene por objeto analizar los resultados de mediciones efectuadas con PQI en mezclas bituminosas donde se utiliza emulsión asfáltica como ligante. Se comprueba la variabilidad de la densidad obtenida con el equipo para este tipo de mezclas, y se comparan los resultados con otros métodos de medida de densidad in situ.

  3. Discussion on the Construction Technology of Asphalt Pavement of Municipal Engineering%市政工程沥青路面施工技术之我见

    Institute of Scientific and Technical Information of China (English)

    李明

    2014-01-01

    The asphalt pavement has high strength, stable pro- perty, rough surface and other characteristics, so it is a kind of pavement types often used in our country road. This paper fo- cuses on the existing problems in the asphalt pavement const- ruction, and puts forward the measures to improve the const- ruction technology of asphalt pavement.%沥青路面具有强度高、性质稳定、表面平整等特点,是我国道路中较常采用的一种路面类型。本文重点研究了城市沥青路面施工中存在的问题,并提出了提高沥青路面施工技术的措施。

  4. 沥青稳定碎石基层对沥青路面力学的特性影响分析%Asphalt Macadam Mechanical Properties of Asphalt Pavement Impact Analysis

    Institute of Scientific and Technical Information of China (English)

    陈勇军

    2012-01-01

    Asphalt stabilized gravel base course can significantly reduces the number of early damage to asphalt pavement. Through using three-dimensional finite element method, the mechanical performance of asphalt pavement structure added asphalt stabilized gravel base is analyzed, and stress and strain of asphalt pavement structure is also analyzed. Performance requirement of drainage base materials is proposed from the point of structural, and the structure design recommendation of semi-rigid base of the asphalt pavement added asphalt stabilized gravel base course is put forward.%沥青稳定碎石基层可以显著减少沥青路面一些早期损害,通过采用ABAQUS三维有限元方法,对设置沥青稳定碎石基层的沥青路面结构进行力学性能分析,分析路面结构应力和应变的影响.从结构角度提出对沥青稳定碎石基层材料的性能的要求,并且对设置排水基层的半刚性基层沥青路面结构设计提出相应建议.

  5. 钢桥面沥青铺装层设计要点分析%Analysis of the Notes about Design of the Steel Bridge Asphalt Pavement

    Institute of Scientific and Technical Information of China (English)

    2013-01-01

      本文根据笔者多年的工作经验,从钢桥面沥青铺装设计的技术要求、桥面沥青铺层的结构和大跨径钢桥面沥青铺装三个方面,探讨了钢桥面沥青铺装层的设计要点。%In this article bases on years of work experience, discusses the design points of steel bridge asphalt pavement fr-om three aspects of the technical requirements of steel bridge asphalt pavement design, the structure of bridge asphalt over-lay and the large span steel bridge asphalt pavement.

  6. Measurements of the Stiffness and Thickness of the Pavement Asphalt Layer Using the Enhanced Resonance Search Method

    Directory of Open Access Journals (Sweden)

    Nur Mustakiza Zakaria

    2014-01-01

    Full Text Available Enhanced resonance search (ERS is a nondestructive testing method that has been created to evaluate the quality of a pavement by means of a special instrument called the pavement integrity scanner (PiScanner. This technique can be used to assess the thickness of the road pavement structure and the profile of shear wave velocity by using the principle of surface wave and body wave propagation. In this study, the ERS technique was used to determine the actual thickness of the asphaltic pavement surface layer, while the shear wave velocities obtained were used to determine its dynamic elastic modulus. A total of fifteen locations were identified and the results were then compared with the specifications of the Malaysian PWD, MDD UKM, and IKRAM. It was found that the value of the elastic modulus of materials is between 3929 MPa and 17726 MPa. A comparison of the average thickness of the samples with the design thickness of MDD UKM showed a difference of 20 to 60%. Thickness of the asphalt surface layer followed the specifications of Malaysian PWD and MDD UKM, while some of the values of stiffness obtained are higher than the standard.

  7. Advanced self-healing asphalt composites in the pavement performance field: mechanisms at the nano level and new repairing methodologies.

    Science.gov (United States)

    Agzenai, Yahya; Pozuelo, Javier; Sanz, Javier; Perez, Ignacio; Baselga, Juan

    2015-01-01

    In an effort to give a global view of this field of research, in this mini-review we highlight the most recent publications and patents focusing on modified asphalt pavements that contain certain reinforcing nanoparticles which impart desirable thermal, electrical and mechanical properties. In response to the increasing cost of asphalt binder and road maintenance, there is a need to look for alternative technologies and new asphalt composites, able to self-repair, for preserving and renewing the existing pavements. First, we will focus on the self-healing property of asphalt, the evidences that support that healing takes place immediately after the contact between the faces of a crack, and how the amount of healing can be measured in both the laboratory and the field. Next we review the hypothetical mechanisms of healing to understand the material behaviour and establish models to quantify the damage-healing process. Thereafter, we outline different technologies, nanotechnologies and methodologies used for self-healing paying particular attention to embedded micro-capsules, new nano-materials like carbon nanotubes and nano-fibres, ionomers, and microwave and induction heating processes.

  8. Test of Microstructur Permeable Asphalt Pavement Used Domato Stone (Quarsite Dolomite As Course Agregate for Surface Layer of Road Pavement

    Directory of Open Access Journals (Sweden)

    Firdaus Chairuddin

    2014-06-01

    Full Text Available The experiment works was dividing into two phases, for phase one was developed to investigate the properties of aggregates and straight asphalt qualities. The experiment work for phase two was developed to design the porous asphalt mix. In this phase Japan’s method and Binamarga’s method was used to define optimum asphalt content. In this phase, has result cantabro loss weight 77.10 for asphalt quality 3% and loss weight 9.70 for asphalt quality 5%. asphalt flow down, air void and density values. The experiment work for phase two was developed to investigate the qualities of porous asphalt. In this phase, wheel tracking machine test was used to investigate the dynamic stability of mixes.

  9. A study of sound absorption by street canyon boundaries and asphalt rubber concrete pavement

    Science.gov (United States)

    Drysdale, Graeme Robert

    A sound field model, based on a classical diffusion equation, is extended to account for sound absorption in a diffusion parameter used to model sound energy in a narrow street canyon. The model accounts for a single sound absorption coefficient, separate accommodation coefficients and a combination of separate absorption and accommodation coefficients from parallel canyon walls. The new expressions are compared to the original formula through numerical simulations to reveal the effect of absorption on sound diffusion. The newly established analytical formulae demonstrate satisfactory agreement with their predecessor under perfect reflection. As well, the influence of the extended diffusion parameter on normalized sound pressure levels in a narrow street canyon is in agreement with experimental data. The diffusion parameters are used to model sound energy density in a street canyon as a function of the sound absorption coefficient of the street canyon walls. The acoustic and material properties of conventional and asphalt rubber concrete (ARC) pavement are also studied to assess how the crumb rubber content influences sound absorption in street canyons. The porosity and absolute permeability of compacted specimens of asphalt rubber concrete are measured and compared to their normal and random incidence sound absorption coefficients as a function of crumb rubber content in the modified binder. Nonlinear trends are found between the sound absorption coefficients, porosity and absolute permeability of the compacted specimens and the percentage of crumb rubber in the modified binders. The cross-sectional areas of the air voids on the surfaces of the compacted specimens are measured using digital image processing techniques and a linear relationship is obtained between the average void area and crumb rubber content. The measured material properties are used to construct an empirical formula relating the average porosity, normal incidence noise reduction coefficients and

  10. Technology Research and Engineering Practice of Asphalt Rubber Low-noise Asphalt Pavement%降噪环保沥青路面技术研究与工程实践

    Institute of Scientific and Technical Information of China (English)

    张志祥; 刘伟; 李小燕

    2011-01-01

    对橡胶沥青绿色降噪环保路面技术进行了研究,包括材料选择、配合比设计方法、性能验证等设计要点,采用复合车辙试验进行高温性能验证,提出了橡胶沥青降噪路面的设计方法流程;并通过自行开发的车载式轮胎/路面噪声测试仪,对各种路面类型的噪声进行了测试,验证了降噪路面的降噪效果。%In this paper,the application of asphalt rubber in porous low-noise asphalt pavement was studied,including materials selection,gradation selection,performance verification,also high-temperature performance was also verified using complex rutting test,and a design process of rubber asphalt low-noise asphalt pavement mixture was put forward.The tire/pavement noise of many kinds of pavement was tested with self developed OBSI,and the advantage of low-noise asphalt pavement was verified.

  11. Simulation Study of Rainwater Infiltration on Permeable Asphalt Pavement%透水性沥青路面雨水入渗模拟研究

    Institute of Scientific and Technical Information of China (English)

    黄小兰; 熊俊; 黄敏; 喻超

    2011-01-01

    Permeable asphalt pavement becomes the important trend of pavement development due to its many advantages such as rapid drainage,skid resistance,rain mist reduction,reflection reduction and noise reduction.In this paper,the paving characteristics of permeable asphalt pavement are discussed.Based on the structural characteristics of permeable asphalt pavement applied in Japan,water head distribution for permeable asphalt pavement and common dense-graded asphalt pavement under rainfall are separately analyzed through numerical simulation,and thus the drainage ability of permeable asphalt pavement under strong rainfall is studied.%透水性沥青路面由于具有迅速排水、抗滑、降低雨天水雾、减少雨后反光、降低噪声等许多优点,而成为道路路面发展的重要方向。讨论了透水性沥青路面在铺装结构上的特点,并基于日本使用的透水性沥青路面结构特征,通过数值模拟,对比分析了降雨条件下透水性沥青路面与普通密级配沥青路面的水头分布变化情况,研究了透水性沥青路面在强降雨期的排水性能。

  12. Evaluation on High-temperature Adhesion Performance of Hot-applied Sealant for Asphalt Pavement

    Institute of Scientific and Technical Information of China (English)

    LI Feng; LI Tinggang; SHI Xiaopei

    2014-01-01

    In order to investigate the high-temperature performances of the asphalt pavement hot-applied sealant, as well as to reduce failures of the sealant pullout, the softening point test and the flow test (two existing methods for evaluating high-temperature performances) were conducted. It was found that both tests could not accurately reflect the adhesion performances of the sealant at high temperatures. For this purpose, the adhesion test for PSAT (pressure sensitive adhesive tape) has been taken as a reference to develop a device that is suitable for evaluating the adhesion performances, by modifying relevant test parameters according to the road conditions at high temperatures. Thirteen common sealants were tested in the modified adhesion test, softening point test and flow test. The experimental results show that no significant correlation (p>0.05) exists between the adhesion value, softening point, adhesion value and flow value;while a significant correlation (p<0.05) exists between the softening point and flow value. The modified adhesion test is efficient in distinguishing the high-temperature adhesion performances of different sealants, and can be used as a standard method for evaluating such performances.

  13. The Construction Technology of Asphalt Concrete Pavement Joints%浅议沥青混凝土路面接缝施工技术

    Institute of Scientific and Technical Information of China (English)

    2013-01-01

    Along with the pavement construction technology continues to improve, asphalt concrete pavement has become the current preferred highway bridge pavement. And the pave-ment joint is an important link in the construction of asphalt pavement, and its construction quality directly affects the app-earance and performance of pavement. This paper briefly desc-rybes and analyzes the joint construction technique in asphalt pavement construction.%  随着路面施工技术的不断提高,沥青混凝土路面已成为当前公路道桥工程路面的首选。而路面接缝是沥青路面施工中的重要环节,其施工质量的好坏直接影响着路面的外观及其工作性能。本文针对沥青路面施工中的接缝施工技术方法进行了简要阐述和分析。

  14. Comparative Study of Asphalt Layer Temperature Field of Combined Type Pavement and Asphalt Pavement with Semi -Rigid Base Course%复合式路面与半刚性基层沥青路面的沥青层温度场对比研究

    Institute of Scientific and Technical Information of China (English)

    王锐

    2012-01-01

    The comparative Study of asphalt layer temperature field of combined type pavement and asphalt pavement with semi -rigid base course could provide support for design and construction of asphalt layer of com- bined type pavement or "change white to black" pavement (paving asphalt surface on old cement concrete pave- ment). Taking the asphalt layer as 2 -3 layers with not totally same thickness and material, each layer is studied and analyzed one after one. The result shows that the temperature field of asphalt layer of the two pavement struc- ture is very similar and the design and construction of asphalt layer of combined type pavement affected by tempera- ture could take that of asphalt pavement with semi - rigid base course as a reference.%通过对复合式路面与半刚性基层沥青路面的沥青层温度场对比研究,可为复合式路面或"白改黑"路面(旧水泥混凝土路面加铺沥青面层)沥青层的设计及施工提供技术支持。将沥青层看作是厚度和材料不全相同的2~3层,然后逐层研究分析,结果表明两种路面结构沥青层的温度场非常相似,认为温度作用下复合式路面沥青层的设计及施工经验可借鉴半刚性基层沥青路面。

  15. 沥青路面渗水性能测试研究%Study on Permeability Test of Asphalt Pavement

    Institute of Scientific and Technical Information of China (English)

    但汉成; 李亮; 何要超; 赵炼恒; 王峰

    2009-01-01

    In order to study the permeability of pavement, an improved method for testing the infiltration coefficient of pavement was adopted into a section of expressway under construction in Hunan province. According to the test result and with combination of the evaluation method, the permeability of each surface course in asphalt pavement was evaluated and analyzed. The differences of permeability of different asphalt mixtures for asphalt pavement were obtained. On this basis, the suggested guidelines of different maximum nominal sizes of aggregate for asphalt pavement permeability test were put forward. Finally, the differences of permeability of different surface courses were analyzed qualitatively. The result shows that (1) the permeabilities of different surface courses exhibit a great variability and coarse aggregate asphalt mixture infiltrates easily than medium aggregate asphalt mixture; (2) the permeability of coarse aggregate asphalt mixture which is incorporated with anti-rut agent will decrease slightly; (3) the permeability coefficient increases with the increasing of thickness of surface course; (4) the transverse distribution of infiltration coefficient on pavement is non-uniform which results from the construction variability and the infiltration coefficient of passing lane is higher than that of driving lane.%采用改进的渗水系数测试试验对湖南省在建高速公路沥青路面进行渗水系数测试.根据测试结果结合沥青路面渗水性能的评价方法对沥青路面各面层的渗水性能进行评价分析,得出了沥青路面不同沥青混合料类型的渗水性能差异,提出了沥青混合料不同公称最大粒径的沥青混合料路面检验用的建议指标.最后对路面结构层的透水性能的差异性进行了定性分析,分析表明:沥青路面各面层的渗水性表现出很大的变异性;粗粒式沥青混合料类型更易渗水;粗粒式沥青混合料掺入抗车辙剂其渗水性能会有所降低;

  16. 道路工程沥青路面施工质量控制措施%The Construction Quality Control Measures of Road Asphalt Pavement

    Institute of Scientific and Technical Information of China (English)

    杨国清

    2014-01-01

    With the development of modern traffic as wel as urban and rural road project, the asphalt pavement widely used in urban and rural road construction project because of the as-phalt pavement has laid the simple and easy maintenance, and many other advantages. Unreasonable engineering constructi-on and management leads to hard to guarantee the quality of as-phalt pavement.%随着现代交通及城乡道路工程的发展,由于沥青路面具有铺设简易、维护方便等诸多优点,因此被广泛运用于城乡道路建设工程。不合理工程施工与管理,导致沥青路面质量难以保证。

  17. Analysis of the Highway Asphalt Pavement Cracks Causes%对高速公路沥青路面裂缝成因的探析

    Institute of Scientific and Technical Information of China (English)

    徐创奇

    2014-01-01

    The asphalt surface crack is a prominent disease problem, which mainly impact on the mechanical properties of asphalt and construction undeserved. This paper carries on the classification asphalt pavement cracks types and carries on the causes, which has certain reference significance for the hig-hway asphalt pavement design and construction of China.%沥青路面的裂缝是一项比较突出的病害问题,主要受到沥青的力学特性和施工不当的影响。本文对沥青路面裂缝产生的类型进行了分类,并对其成因进行了探析,对于我国高速公路沥青路面设计及施工具有一定的参考意义。

  18. Discussion on main technical points of highway asphalt pavement construction%谈公路沥青路面施工技术要点

    Institute of Scientific and Technical Information of China (English)

    雷慧萍

    2016-01-01

    介绍了沥青路面的常见病害类型,从沥青材料选择、运输、摊铺等方面,阐述了沥青路面施工的技术要点,并探讨了沥青路面压实成型与接缝处理的注意事项,有利于确保公路沥青路面的施工质量,从而提高车辆行驶的安全性与舒适度.%The paper introduced the common disease types of asphalt pavement,from the asphalt material selection,transportation,paving and other aspects,elaborated the main technical points of asphalt pavement construction,and discussed the matters needing attention of asphalt pave-ment compaction molding and joint attention,to ensure that the construction quality of highway asphalt pavement,so as to improve the vehicle safety and comfortable.

  19. Concentrations of polycyclic aromatic hydrocarbons (PAHs) and azaarenes in runoff from coal-tar- and asphalt-sealcoated pavement

    Science.gov (United States)

    Mahler, Barbara J.; Van Metre, Peter C.; Foreman, William T.

    2014-01-01

    Coal-tar-based sealcoat, used extensively on parking lots and driveways in North America, is a potent source of PAHs. We investigated how concentrations and assemblages of PAHs and azaarenes in runoff from pavement newly sealed with coal-tar-based (CT) or asphalt-based (AS) sealcoat changed over time. Samples of simulated runoff were collected from pavement 5 h to 111 d following application of AS or CT sealcoat. Concentrations of the sum of 16 PAHs (median concentrations of 328 and 35 μg/L for CT and AS runoff, respectively) in runoff varied relatively little, but rapid decreases in concentrations of azaarenes and low molecular weight PAHs were offset by increases in high molecular weight PAHs. The results demonstrate that runoff from CT-sealcoated pavement, in particular, continues to contain elevated concentrations of PAHs long after a 24-h curing time, with implications for the fate, transport, and ecotoxicological effects of contaminants in runoff from CT-sealcoated pavement.

  20. Concentrations of polycyclic aromatic hydrocarbons (PAHs) and azaarenes in runoff from coal-tar- and asphalt-sealcoated pavement.

    Science.gov (United States)

    Mahler, Barbara J; Van Metre, Peter C; Foreman, William T

    2014-05-01

    Coal-tar-based sealcoat, used extensively on parking lots and driveways in North America, is a potent source of PAHs. We investigated how concentrations and assemblages of PAHs and azaarenes in runoff from pavement newly sealed with coal-tar-based (CT) or asphalt-based (AS) sealcoat changed over time. Samples of simulated runoff were collected from pavement 5 h to 111 d following application of AS or CT sealcoat. Concentrations of the sum of 16 PAHs (median concentrations of 328 and 35 μg/L for CT and AS runoff, respectively) in runoff varied relatively little, but rapid decreases in concentrations of azaarenes and low molecular weight PAHs were offset by increases in high molecular weight PAHs. The results demonstrate that runoff from CT-sealcoated pavement, in particular, continues to contain elevated concentrations of PAHs long after a 24-h curing time, with implications for the fate, transport, and ecotoxicological effects of contaminants in runoff from CT-sealcoated pavement.

  1. Analysis on classification and application of asphalt pavement recycling technology%沥青路面再生技术的分类及应用分析

    Institute of Scientific and Technical Information of China (English)

    王勇

    2015-01-01

    结合我国路面快速恶化的现状,阐述了沥青路面材料循环利用的意义,并对沥青路面再生技术进行了分析,着重研究了不同类别的沥青路面再生技术的优缺点及其适用范围,以合理选用路面材料循环利用技术,形成可靠耐久、经济合理的路面再生设计方案。%Combining with domestic pavement rapidly deteriorating conditions,the thesis describes the meaning for asphalt pavement material re-cycling and utilization,analyzes asphalt pavement recycling technology,mainly studies advantages and disadvantages and application scope of dif-ferent asphalt pavement recycling technology,with a view to rationally select pavement material recycling technology and form durable and eco-nomic pavement recycling design scheme.

  2. Key Technology of Asphalt Pavement Hot-In-Place Recycling%沥青路面就地热再生关键技术

    Institute of Scientific and Technical Information of China (English)

    游新宇

    2014-01-01

    沥青路面就地热再生技术已成为沥青路面维修改造的主要方法之一。以就地热再生技术为研究对象,结合室内试验与实际工程,对原路面调查与评价、回收沥青以及再生剂的选择、新旧沥青的掺配性能试验、马歇尔配合比的设计等关键技术进行了研究,所得研究成果可有效指导沥青路面就地热再生技术的应用。%The hot-in-place recycling technology of asphalt pavement has been one of the main methods for asphalt pavement reconstruction. Taken the hot-in-place recycling technology as the research ob-ject, the article studies the key technologies such as the survey and evaluation of the original road, as-phalt recovery and regeneration agent selection, the old and new asphalt mixing performance test, Mar-shall asphalt mixture design, and so on. Combined with laboratory tests and practical projects,the results can guide the hot-in-place recycling technology application of asphalt pavement effectively.

  3. Using Pyrolized Carbon Black (PCB) from Waste Tires in Asphalt Pavement (Part 1, Limestone Aggregate)

    OpenAIRE

    Park, Taesoon; Lovell, C. W.

    1996-01-01

    This study presents the viability of using PCB as an additive in hot mix asphalt concrete. Different ratios of PCB (5%, 10%, 15%, and 20% by weight of asphalt) were blended with two grades of asphalt (AC-10 and AC-20). The complete behaviors of the PCB modified asphalt concrete were investigated by comprehensive laboratory testing and evaluation. The Marshall method was used to determine the optimum binder content and the mechanical properties and void relationships were investigated by th...

  4. Rapid Detection Methods for Asphalt Pavement Thicknesses and Defects by a Vehicle-Mounted Ground Penetrating Radar (GPR System

    Directory of Open Access Journals (Sweden)

    Zehua Dong

    2016-12-01

    Full Text Available The thickness estimation of the top surface layer and surface layer, as well as the detection of road defects, are of great importance to the quality conditions of asphalt pavement. Although ground penetrating radar (GPR methods have been widely used in non-destructive detection of pavements, the thickness estimation of the thin top surface layer is still a difficult problem due to the limitations of GPR resolution and the similar permittivity of asphalt sub-layers. Besides, the detection of some road defects, including inadequate compaction and delamination at interfaces, require further practical study. In this paper, a newly-developed vehicle-mounted GPR detection system is introduced. We used a horizontal high-pass filter and a modified layer localization method to extract the underground layers. Besides, according to lab experiments and simulation analysis, we proposed theoretical methods for detecting the degree of compaction and delamination at the interface, respectively. Moreover, a field test was carried out and the estimated results showed a satisfactory accuracy of the system and methods.

  5. Rapid Detection Methods for Asphalt Pavement Thicknesses and Defects by a Vehicle-Mounted Ground Penetrating Radar (GPR) System.

    Science.gov (United States)

    Dong, Zehua; Ye, Shengbo; Gao, Yunze; Fang, Guangyou; Zhang, Xiaojuan; Xue, Zhongjun; Zhang, Tao

    2016-12-06

    The thickness estimation of the top surface layer and surface layer, as well as the detection of road defects, are of great importance to the quality conditions of asphalt pavement. Although ground penetrating radar (GPR) methods have been widely used in non-destructive detection of pavements, the thickness estimation of the thin top surface layer is still a difficult problem due to the limitations of GPR resolution and the similar permittivity of asphalt sub-layers. Besides, the detection of some road defects, including inadequate compaction and delamination at interfaces, require further practical study. In this paper, a newly-developed vehicle-mounted GPR detection system is introduced. We used a horizontal high-pass filter and a modified layer localization method to extract the underground layers. Besides, according to lab experiments and simulation analysis, we proposed theoretical methods for detecting the degree of compaction and delamination at the interface, respectively. Moreover, a field test was carried out and the estimated results showed a satisfactory accuracy of the system and methods.

  6. 沥青层厚度对沥青路面车辙的影响研究%Research on Influences of Asphalt Layer Thickness on Asphalt Pavement Ruts

    Institute of Scientific and Technical Information of China (English)

    毛磊; 周建山

    2014-01-01

    Based on the elastic layer system theory and by means of ABAQUS finite element software, this paper performs numerical simulation for asphalt pavement structures, and analyzes the influences of asphalt pavement thickness on permanent deformation of asphalt pavement. The analysis shows very remarkable influences of asphalt layer thickness on compaction type ruts, and the depth of ruts increases with asphalt layer thickness, but the tendency of increase gradually reduces from original 10% to 4%;the depth of the maximum shear stress in asphalt layer does not change with asphalt layer thickness and appears at 4 ~6 mm under road surface, therefore, the influence of asphalt layer thickness on shear flow deformation is not significant.%基于弹性层状体系理论,利用ABAQUS有限元软件对沥青路面结构进行数值模拟,分析沥青层厚度对沥青路面永久变形的影响。分析表明:沥青层厚度对压密型车辙的影响非常显著,车辙深度随着沥青层厚度的增加而增大,但是随着沥青层厚度的增加,增长趋势逐渐减少,由最初的10%的增长量减少到4%;沥青层内最大剪应力出现的深度不随沥青层厚度的变化而变化,均出现在路表下4~6 cm处,因此沥青层厚度对剪切流动变形的影响不是很大。

  7. Permeability Test of Asphalt Pavement and countermeasures%沥青路面渗水试验检测与防治对策

    Institute of Scientific and Technical Information of China (English)

    李伟

    2015-01-01

    〗沥青路面渗水的原因主要包括水力冲刷、置换作用等。工程运营前要严格按照规范要求进行渗水试验,计算并整理渗水系数。同时还要合理选择面层结构、重视施工质量控制、提高沥青与集料的结合性能、改善排水设施,对渗水路面也要及时采取措施处理。从而实现对渗水现象的有效预防,确保沥青路面工程质量。%The reasons of asphalt pavement seepage mainly include the hydraulic erosion and replace-ment effect.Before the engineering operations,asphalt pavement should be strictly tested in accord-ance with the requirements of the specification of Permeability test.It is necessary to select the struc-ture of the surface,pay attention to the construction quality control,improve the combination of as-phalt and aggregate,improve the drainage facilities,as well as the seepage pavement,so as to realize the effective prevention of the seepage phenomenon and ensure the quality of asphalt pavement engi-neering.

  8. Discussion on maintenance of asphalt concrete pavement in the rural highway%论农村公路沥青混凝土路面养护方法

    Institute of Scientific and Technical Information of China (English)

    邹海洋

    2013-01-01

    Asphalt concrete pavement with many excellent properties is widely used in road construction.But the asphalt concrete pavement in the use of the process will still exist all kinds of diseases,these diseases will have a very negative impact on the road quality and traffic safety.This paper expounds the importance of rural highway maintenance,then introduces the diseases and causes of asphalt concrete pavement,at last puts forward maintenance measures of asphalt concrete pavement of rural highway.%沥青混凝土路面具备很多优良的性能,在道路建设中应用非常广泛。但是沥青混凝土路面在使用过程中,还是会存在各种各样的病害,这些病害对公路质量水平和行车安全会产生十分不利的影响。文章阐述了农村公路养护的重要性,介绍了沥青混凝土路面的病害和成因,并提出了农村公路沥青混凝土路面养护措施。

  9. Analysis of Maximum Shear Stress of Asphalt Pavement%沥青路面最大剪应力分析

    Institute of Scientific and Technical Information of China (English)

    陈光伟; 费国新; 陈荣生

    2012-01-01

    Factors and variation of the maximum shear stress of the typical semi-rigid asphalt pavement and bridge deck pavement in Jiangsu were calculated and analyzed using ABAQUS software. The maximum shear stress distribution was consistent with the semi-rigid asphalt pavement and bridge deck pavement and the maximum shear stress level was close under the level. The maximum shear stress showed a positive correlation with the verticaland horizontal vehicle loads and was significantly affected by the loads. The maximum shear stress decreased as the pavement thickness and modulus increase, and increased as the semi-rigid base thickness and modulus increase, but the increase value was small. Thereby these analysis above would provides an academic basis for solving the rutting problem.%采用ABAQUS软件对典型半刚性基层沥青路面及桥面铺装层中最大剪应力影响因素及变化规律进行了计算与分析。分析表明:半刚性基层沥青路面与水泥混凝土桥面铺装层最大剪应力分布与变化规律基本一致,在相同荷载条件作用下,最大剪应力水平亦接近;最大剪应力与车辆垂直荷载和水平荷载作用呈正比关系,最大剪应力受其影响显著;最大剪应力随着面层或铺装层厚度、模量的增加而相应地变小,随着半刚性基层厚度与模量的增加而变大。以上抗剪影响因素及变化规律的研究为解决车辙问题提供了一定的理论基础。

  10. 浅谈高速沥青混凝土路面施工接缝处理%Discuss the Joint Treatment of Highway Asphalt Concrete Pavement Construction

    Institute of Scientific and Technical Information of China (English)

    樊琳琳

    2014-01-01

    针对高速沥青混凝土路面施工接缝处理,本文主要探讨了路面施工接缝处理和施工接缝碾压工艺等技术。为了提高高速沥青混凝土路面实施接缝处理技术,需要提出有效的合理的措施。%In view of the joint treatment of highway asphalt concrete pavement construction, this article mainly discusses the technologies of pavement construction joint treatment and construction joint compaction craft. In order to improve the i-mplementation of joint treatment technology in highway asph-alt concrete pavement, people need put forward effective and reasonable measures.

  11. Discussion on crack problems of asphalt concrete pavement%沥青混凝土路面裂缝问题的探讨

    Institute of Scientific and Technical Information of China (English)

    李泽林

    2012-01-01

    分析了公路沥青混凝土路面裂缝的类型、形成原因及影响因素,阐述了裂缝对路面的危害,提出了对沥青路面裂缝的预防措施与处治方法,并分别作了具体介绍,以期指导实践。%This paper analysed the crack types, formation causes and influence factors of highway asphalt concrete pavement, elaborated the harm of cracks to pavement, proposed to the prevention measures and treatment methods to asphalt pavement cracks, and made detailed introduction, in order to guide practice.

  12. 公路旧沥青砼路面冷再生施工技术分析%Analysis of Construction Technology of Highway Asphalt Pavement Cold Recycling

    Institute of Scientific and Technical Information of China (English)

    房兴华

    2014-01-01

    本文介绍了沥青路面冷再生的技术原理、特点与用途,我国沥青路面冷再生技术的应用现状和趋势,并介绍了其施工技术要点和良好的社会效益。本文的研究可以作为路面施工过程的参考。%This paper introduces the technical principle, char-acteristics and application of asphalt pavement cold regener-ation, application status and trend of the technology of cold recycling of asphalt pavement in our country, and introduces the main points of construction technology and good social benefit. The research of this paper can be used as reference for pavement construction process.

  13. Influence of limestone fillers on combustion characteristics of asphalt mortar for pavements

    DEFF Research Database (Denmark)

    Ke, Wu; Kai, Zhu; Wu, Hao;

    2014-01-01

    Asphalt materials will be ignited and release significant toxic fumes within tunnel fires. Thus, combustion characteristics of asphalt materials used in road tunnel should be studied in order to limit such an adverse effect. In the present work we study the influence of limestone fillers...... on combustion characteristics of asphalt mortar by thermogravimetric and kinetic analysis. It is shown that the combustion of asphalt mortar is not just a linear superposition of asphalt and limestone. The limestone will increase the ignition point and the activation energy of the primary volatile release......, and will catalyze the char formation from the primary volatile release. Kinetic analysis shows that the primary volatile release stage of asphalt mortar combustion can be explained by a three-dimensional diffusion model, the secondary volatile release and char combustion stage can be explained by a model under...

  14. 高模量沥青面层合理结构形式的有限元研究%Definite Element Study on Reasonable Structure Form of High Modulus Asphalt Pavement

    Institute of Scientific and Technical Information of China (English)

    王先伟

    2012-01-01

    本文根据以往的经验提出了三种高模量沥青路面的结构形式,并从应力、应变和弯沉值的角度对高模量沥青面层结构进行分析,从而得出了高模量沥青混凝土路面的合理结构形式,为相关的沥青路面设计提供了一个新的分析方法。%This article provides three type of high modulus asphalt pavement structure form based on previous experience. It analyses high modulus asphalt pavement structure form from stress, strain and deflection value. A reasonable structure form of high modulus asphalt pavement is given, which also provides a new method to design asphalt pavement.

  15. 海南省沥青路面水损坏的原因及防治措施分析%Analysis of the Cause and Preventive Measures of Water Damage of Asphalt Pavement in Hainan Province

    Institute of Scientific and Technical Information of China (English)

    周容; 蒋必凤

    2013-01-01

      水损坏对沥青路面危害极大,已成为海南省沥青路面早期破坏的主要形式之一。本文结合海南省特点,从原材料、降水、设计、施工、养护管理几方面探讨沥青路面产生水损坏的原因,并提出相应措施。%The water damage of asphalt pavement done great harm to the asphalt pavement, has become one of the main forms of Hainan asphalt pavement damage. This article combining the characteristics of Hainan Province, discussed the cause of water damage of asphalt pavement from raw materials, rainfall, design, construction, road maintenance and operations management,then proposed several corresponding measures.

  16. Monitoring Hot Mix Asphalt Temperature to Improve Homogeneity and Pavement Quality

    NARCIS (Netherlands)

    Huerne, ter H.L.; Doree, A.G.; Miller, S.R.; Santagata, E.

    2009-01-01

    This paper describes how controlled compaction practices lead to better quality asphalt. Therefore, it is important that during compaction operations the mixture is at a suitable temperature in order to achieve the specified degree of compaction. The University of Twente’s Asphalt Paving Research an

  17. Initial analysis on early destruction of asphalt pavement%沥青路面早期损坏原因浅析

    Institute of Scientific and Technical Information of China (English)

    姜金节

    2009-01-01

    The author analyzes the early destruction of the asphalt pavement, discusses on it from aspects of pavement design, foundation con-struction, raw material and mixture and mixture design, construction control, maintenance management and other aspects, gets research on all kinds of parameters on pavement early destruction, reaches the effect of preventing pavement early destruction.%对沥青路面的早期损坏进行了分析,从路面设计、基层施工、原材料及混合料设计、施工控制、养护管理及其他方面进行了论述,进行了各种因素对路面早期损坏的研究,达到了预防路面早期损坏的效果.

  18. 高性能沥青混凝土机场道面结构%Airfield pavement with high performance asphalt concrete

    Institute of Scientific and Technical Information of China (English)

    钱振东; 孟凡奇; 曾靖

    2015-01-01

    To improve the anti-rutting performance of airfield pavement, a high performance airfield pavement based on a new type of epoxy asphalt concrete was proposed.With the new type of epoxy asphalt concrete EAC20 as the middle surface course, SMA13 asphalt concrete as the first surface course, and AC20 asphalt concrete as the base surface course, the SEA airfield pavement was built up.The mechanical responses of the SEA airfield pavement under the static loads of the aircraft A380 were analyzed.The permanent deformation tests of the asphalt concrete in different airfield pavement layers were carried out.The creep parameters of the asphalt concrete in each layer were obtained by using the multiple linear regression method to simulate the permanent deformation of the SEA airfield pavement.The results demonstrate that taking the new type of epoxy asphalt concrete as the middle surface course can reduce the strain of the airfield pavement.The maximum tensile strain and the maximum compressive strain on the bottom of the asphalt surface course are respectively about 68%and 72%those of the traditional airfield pavement.Under 1 ×105 loads, the permanent deformation of the SEA airfield pavement is only 6 mm, which is about 42.9%that of the traditional SAA airfield pavement.%为增强机场沥青道面的抗轮辙性能,提出了一种基于新型环氧沥青混凝土的高性能机场道面结构.将新型环氧沥青混凝土EAC20作为机场道面的中面层,SMA13型沥青混凝土作为上面层,AC20型沥青混凝土作为下面层,由此构成SEA机场道面结构.分析了新一代大型客机A380荷载作用下SEA机场道面结构的力学响应,针对机场道面各层沥青混凝土进行永久变形试验,并采用多元线性回归得到各层材料的蠕变参数,以模拟SEA机场道面结构的永久变形.研究结果表明,将新型环氧沥青混凝土作为中面层应用于机场道面,可以减小机场道面结构的应变,沥

  19. Study on Hot In-Place Recycling Technology of Asphalt Pavement%沥青路面就地热再生技术研究

    Institute of Scientific and Technical Information of China (English)

    徐安花; 房建宏

    2015-01-01

    As a kind of regenerative preventative maintenance technology ,hot in -place recycling technolo‐gy of asphalt pavement ,is effective on performance recovery of asphalt pavement .By using this technology ,as‐phalt pavement can be repaired rapidly and continuously .In this paper ,technical principles and attentions of hot in-place recycling technology of asphalt pavement are clarified in terms of suitability ,material design etc ., w hich provides references on the application of hot in -place recycling technology .%沥青路面就地热再生技术是一种可有效恢复沥青路面路用性能的再生型预防性养护技术,可实现沥青路面面层的快速、连续修复。从就地热再生的适应性、再生原理、材料设计等方面阐释了沥青路面就地热再生的技术原理及注意事项,为就地热再生技术的推广应用提供技术借鉴。

  20. 纳米改性沥青混合料路用性能%Pavement performance of nanomaterial modified asphalt mixture

    Institute of Scientific and Technical Information of China (English)

    孙璐; 辛宪涛; 任皎龙

    2013-01-01

    The high temperature stability,the low temperature crack resistance and the water stability of nano-SiO2 modified asphalt mixture,bentonite modified asphalt mixture,nano-SiO2/bentonite complex modified asphalt mixture and nano-SiO2/bentonite/SBS complex modified asphalt mixture are studied by laboratory experiments in comparison with matrix asphalt mixture and SBS modified asphalt.The results show that compared with matrix asphalt mixture,the high temperature stability and the water stability of nano-SiO2 modified asphalt mixture,bentonite modified asphalt mixture and nano-SiO2/bentonite complex modified asphalt mixture increase 56% to 77% and 3% to 7%,respectively,while there are no obvious differences when compared with SBS modified asphalt mixture.The high temperature stability and the water stability of nano-SiO2/bentonite/SBS complex modified asphalt mixture are the highest in the six kinds of asphalt,and they are 86% and 3% higher than those of SBS modified asphalt mixture respectively.The low temperature performance of nanoSiO2 modified asphalt mixture,bentonite modified asphalt mixture and nano-SiO2/bentonite complex modified asphalt mixture decreases slightly,but it still satisfies the requirement of the low temperature crack resistance on asphalt pavement.Therefore,the nanomaterial modified asphalt mixture has excellent pavement performance and it is suitable for the application of asphalt modified technology.%通过室内试验研究了纳米SiO2改性沥青混合料、膨润土改性沥青混合料、纳米SiO2/膨润土复合改性沥青混合料、纳米SiO2/膨润土/SBS复合改性沥青混合料的高温稳定性、低温抗裂性和水稳定性,并与基质沥青混合料和SBS改性沥青混合料进行对比.结果表明,纳米SiO2改性沥青混合料、膨润土改性沥青混合料、纳米SiO2/膨润土复合改性沥青混合料的高温稳定性较基质沥青提高了56% ~77%,水稳定性提高了3% ~7%,与SBS改

  1. Determination of the heating temperature of potholes surface on road pavement in the process of repairs using hot asphalt concrete mixes

    Directory of Open Access Journals (Sweden)

    Giyasov Botir Iminzhonovich

    2014-12-01

    Full Text Available In the process of roads construction the necessary transport and operational characteristics should be achieved, which depend on the quality of the applied, material and technologies. Under the loads of transport means and the influence of weather conditions on the road pavement deformations and destructions occur, which lead to worsening of transport and operational characteristics, decrease of operational life of the road and they are often the reason of road accidents. According to the data of the Strategic Research Center of "Rosgosstrah" more than 20 % of road accidents in Russia occur due to bad quality of road pavement. One of the main directions in traffic security control and prolongation of operational life for road pavement of non-rigid type is road works, as a result of which defects of pavement are eliminated and in case of timely repairs of high quality the operational life of the road increases for several years. The most widely used material for non-rigid pavement repairs is hot road concrete mixes and in case of adherence to specifications they provide high quality of works. The authors investigate the problems of hot asphalt concrete mixes for repairs of road surfaces of non-rigid type. The results of the study hot asphalt concrete mix’s temperature regimes are offered in case of repair works considering the temperature delivered to the work site and the ambient temperature depending on the type of mix and class of bitumen.

  2. 温再生沥青混合料路用性能的试验研究%Research on the pavement performance of warm- recycled asphalt mixture

    Institute of Scientific and Technical Information of China (English)

    张德豪; 刘岩

    2015-01-01

    温再生沥青混合料是一种基于温拌沥青技术的新型再生沥青混合料,实现了旧沥青混合料(RAP)循环利用和节能减排的双重目标。本文通过与热再生沥青混合料的对比试验,研究了不同旧料掺量下温再生沥青混合料的路用性能。结果表明:温再生沥青混合料各项指标均已接近或达到了热再生沥青混合料的性能,而且旧料的掺配率可以提高10%左右;旧料掺量为20~30%时,温再生混合料的性能良好,可用于城市道路沥青路面的建设。%Warm-recycled asphalt mixture is a new type of pavement material that can realize the RAP recycling and energy saving and emission reduction. Trough the comparative test of hot-recycled asphalt mixture, the article studied the comprehensive pavement performance of warm-recycled asphalt mixture with the addition of different reclaimed asphalt pavement(RAP) admixture amount. The results showed that: all indicators of the warm- recycled asphalt mixture were close to or reached the performance of hot-recycled asphalt mixture,and the admixture amount of RAP can be improved about 10%. The RAP content should be among 20~30% when the WMA recycled mixture used in high grade highway construction.

  3. 浅析G206国道景德镇段白改黑路面改造设计与施工%Design and Construction of Pavement Asphalt Transformation in Jingdezhen Section of G206 National Highway

    Institute of Scientific and Technical Information of China (English)

    程曦; 施璐

    2014-01-01

    This paper combines with an example to analyze the importance of the design and construction of pavement asphalt transformation by rubblization in old cement pavement.%本文结合实例浅析老水泥路面采用碎石化进行白改黑改造设计与施工的要点。

  4. 橡胶沥青路面的结构类型及应用%The structure type and application of rubber asphalt pavement

    Institute of Scientific and Technical Information of China (English)

    赵评宏

    2015-01-01

    This paper discussed two kinds of production technology of rubber asphalt,analyzed the technical advantages of rubber asphalt,intro-duced the main structure types of rubber asphalt applied in pavement,and discussed the characteristics of gap gradation rubber asphalt concrete, rubber asphalt stone mastic,rubber asphalt stress absorbing layer,put forward the research direction improvement of rubber asphalt performance.%论述了橡胶沥青的两种生产工艺,分析了橡胶沥青具有的技术优势,介绍了橡胶沥青应用于路面的主要结构类型,并对断级配橡胶沥青混凝土、橡胶沥青玛脂碎石、橡胶沥青应力吸收层的特性进行了探讨,提出了完善橡胶沥青性能的研究方向。

  5. Overlaying Design of Lianguang Road Old Asphalt Pavement%联广路旧沥青路面加铺设计

    Institute of Scientific and Technical Information of China (English)

    陈燕飞

    2013-01-01

    Through the Lianguang road pavement reconstruction project, this paper introduced the assessment of asphalt pavement surface distress situation and proposed the different overlaying designs for different road damage situation.%  通过联广路路面改造项目,介绍沥青路面破损状况分析评定,针对不同的路面破损情况提出不同的旧路加铺设计方案。

  6. Sensitivity analysis of asphalt-pavement structure dynamic responses under heavy load

    Directory of Open Access Journals (Sweden)

    ZHANG Lijuan

    2015-04-01

    Full Text Available With the 3-Dimensional finite-element dynamic model,the influence of axis-load,axis-speed,and pavement structure parameters on dynamic performance of pavement structure is studied.The results show that with the increase in load,the dynamic response of pavement is nearly proportional to axis-load and increases noticeably;Axis-speed influences the dynamic response to some extent.With the increase of axis-speed,dynamic response of pavement structure increases firstly.With axis-speed further increasing,dynamic response of pavement structure then decreases gradually.For fatigue failure,the influence of heavy-load with common moving speed is much greater than that of static load.Among the pavement structure parameters,thickness of surface-layer has a significant effect on shear stress and the compression stress at road surface.Subgrade modulus has a significant effect on road surface deflection,tensile stress at the bottom of subbase,and compression-strain at the top of subgrade.

  7. Construction Techniques of Asphalt Concrete Pavement%浅析沥青混凝土路面施工技术

    Institute of Scientific and Technical Information of China (English)

    席晓彬

    2012-01-01

    随着我国公路建设事业的发展,沥青混凝土路面由于具有表面平整、行车舒适、耐磨、噪音小、施工周期短、养护维修简便等优点,无扬尘、无振动,还具有良好的抗滑性,因而被越来越多地应用到公路建设中。因此,只有对施工组织设计以及每道工序严格地控制,才能保证沥青混凝土路面的质量。%With the development of highway construction in China,asphalt concrete pavement is widely used for its advantages of smooth surface,comfortable driving,abrasion resistance,low noise,short construction period and easy maintenance and repair,and its non-dust and non-vibration construction with better slip resistance.Therefore,every procedure in construction and design should be strictly controlled to guarantee the quality of the pavement.

  8. Problems of Asphalt Pavement Design Method%沥青路面设计方法中存在的问题探析

    Institute of Scientific and Technical Information of China (English)

    索函军

    2014-01-01

    简单阐述了经验法和力学-经验法等国外沥青路面设计方法和国内的设计要求,分析我国现行的沥青路面设计方法中存在的问题,提出设计标准和材料参数等方面的建议。%This paper briefly describes the foreign asphalt pavement methods as empirical method and me-chanical-empirical method, together with the domestic design requirements, analyzes issues existing in China’ s current asphalt pavement design method, and gives some suggestions in the aspects of design standards and material parameters.

  9. Experimental study of the effect of the thermal conductivity of EAF slag aggregates used in asphaltic concrete of wearing courses on the durability of road pavements

    OpenAIRE

    Barra Bizinotto, Marilda; Aponte Hernández, Diego Fernando; Vázquez Ramonich, Enric; Méndez Candelario, Braulio Aquilino; Miró Recasens, José Rodrigo; Valls del Barrio, Susanna

    2017-01-01

    Electric Arc Furnace (EAF) steel slag is the basic material used to obtain good quality aggregates in different layers of road pavements. Many scientific papers have reported on the high frictional and abrasion resistance of this material. EAF slag aggregates are hard, dense, chemically stable and have good adhesion with bitumen, all characteristics related with its high alkaline character. These properties are important in hot mix asphalt for wearing courses where high wear is present and op...

  10. Design and Application of Anti Rutting in Asphalt Pavement in Long and steep sections%长大纵坡路段抗车辙沥青路面的设计及应用

    Institute of Scientific and Technical Information of China (English)

    王玲

    2015-01-01

    针对沥青路面特别是长大纵坡路段车辙的成因,分析抗车辙沥青路面设计对策,包括沥青路面结构层设计和沥青混合料设计。实际应用表明,通过加大沥青层厚度,优化沥青混合料性能,能确保沥青路面良好的抗车辙性能,促进路面使用性能提升。%This paper introduces the causes of asphalt pavement rutting,especially in long and steep sections,pavement design and analysis of anti rutting asphalt,mainly including the asphalt pavement structure layer design and asphalt mixture design.Application results show that the addition of Dali green layer thickness and optimization of asphalt mixture performance can ensure good performance of anti rutting of asphalt pavement,and improve pavement performance.

  11. 浅析长寿命沥青路面的发展现状及设计理念%Initial analysis on development situation and design idea of asphalt pavement with long service life

    Institute of Scientific and Technical Information of China (English)

    王莉华; 藏芝树

    2009-01-01

    According to the review on the corresponding material, the paper mainly introduces the development current situation and structural design characteristics of the asphalt pavement with long service life, and points out that compared with traditional asphalt pavement, the as-phalt pavement with long service life can avoid early destruction effectively, improve the service life of the pavement greatly and its mainte-nance is economical and convenient.%通过对相关资料的概括,主要介绍了长寿命沥青路面的发展现状及结构设计特点,并指出与传统的沥青路面相比,长寿命沥青路面能够有效地避免早期破坏,并且能大幅度地提高路面使用寿命且维修经济简便.

  12. Comparative Evaluation of Pavement Crack Detection Using Kernel-Based Techniques in Asphalt Road Surfaces

    Science.gov (United States)

    Miraliakbari, A.; Sok, S.; Ouma, Y. O.; Hahn, M.

    2016-06-01

    With the increasing demand for the digital survey and acquisition of road pavement conditions, there is also the parallel growing need for the development of automated techniques for the analysis and evaluation of the actual road conditions. This is due in part to the resulting large volumes of road pavement data captured through digital surveys, and also to the requirements for rapid data processing and evaluations. In this study, the Canon 5D Mark II RGB camera with a resolution of 21 megapixels is used for the road pavement condition mapping. Even though many imaging and mapping sensors are available, the development of automated pavement distress detection, recognition and extraction systems for pavement condition is still a challenge. In order to detect and extract pavement cracks, a comparative evaluation of kernel-based segmentation methods comprising line filtering (LF), local binary pattern (LBP) and high-pass filtering (HPF) is carried out. While the LF and LBP methods are based on the principle of rotation-invariance for pattern matching, the HPF applies the same principle for filtering, but with a rotational invariant matrix. With respect to the processing speeds, HPF is fastest due to the fact that it is based on a single kernel, as compared to LF and LBP which are based on several kernels. Experiments with 20 sample images which contain linear, block and alligator cracks are carried out. On an average a completeness of distress extraction with values of 81.2%, 76.2% and 81.1% have been found for LF, HPF and LBP respectively.

  13. COMPARATIVE EVALUATION OF PAVEMENT CRACK DETECTION USING KERNEL-BASED TECHNIQUES IN ASPHALT ROAD SURFACES

    Directory of Open Access Journals (Sweden)

    A. Miraliakbari

    2016-06-01

    Full Text Available With the increasing demand for the digital survey and acquisition of road pavement conditions, there is also the parallel growing need for the development of automated techniques for the analysis and evaluation of the actual road conditions. This is due in part to the resulting large volumes of road pavement data captured through digital surveys, and also to the requirements for rapid data processing and evaluations. In this study, the Canon 5D Mark II RGB camera with a resolution of 21 megapixels is used for the road pavement condition mapping. Even though many imaging and mapping sensors are available, the development of automated pavement distress detection, recognition and extraction systems for pavement condition is still a challenge. In order to detect and extract pavement cracks, a comparative evaluation of kernel-based segmentation methods comprising line filtering (LF, local binary pattern (LBP and high-pass filtering (HPF is carried out. While the LF and LBP methods are based on the principle of rotation-invariance for pattern matching, the HPF applies the same principle for filtering, but with a rotational invariant matrix. With respect to the processing speeds, HPF is fastest due to the fact that it is based on a single kernel, as compared to LF and LBP which are based on several kernels. Experiments with 20 sample images which contain linear, block and alligator cracks are carried out. On an average a completeness of distress extraction with values of 81.2%, 76.2% and 81.1% have been found for LF, HPF and LBP respectively.

  14. Performance Review of Permeable Asphalt Pavement%透水性沥青路面路用性能研究综述

    Institute of Scientific and Technical Information of China (English)

    高岩; 郑丹丹; 朱坤佳; 王兴国

    2013-01-01

    近年来,透水性沥青路面在国内外得到了越来越多的应用.介绍了透水性沥青路面结构特点及原材料选择原则,重点介绍了国内外渗透系数的测试方法及目标空隙率的确定;同时,对透水性沥青路面降温、降噪、抗车辙等路用性能的研究现状做了详细的论述;并提出施工中存在的问题和建议,为透水性沥青路面的进一步推广提供参考价值.%In recent years,the permeable asphalt pavement has been wildly used at home and abroad.Its structure characteristics and raw materials selection principles are introduced in this paper and mainly described the test device of permeability coefficient and the relation between permeability coefficient and percentage of voids.Meanwhile,the road performance of asphalt pavement about cooling,noise reduction,anti-rutting and many aspects have been made a detailed elaboration,and also been put forward the existing problems and suggestions in the process of construction.It will be a reference for the further popularization of the permeable asphalt pavement.

  15. 道路设计中的沥青路面结构组合要点%The combination key points of asphalt pavement structure in road design

    Institute of Scientific and Technical Information of China (English)

    张琳

    2014-01-01

    主要对道路设计中沥青路面结构组合类型选择时需遵循的因地制宜原则、方便施工与养护原则、综合排水设计原则及增加路面结构层功能性原则进行了阐述,并对沥青路面结构组合的类型以及各层次之间的影响作了分析,以提高路面结构的稳定性。%This paper mainly elaborated the followed act according to circumstances principle,convenient construction and maintenance princi-ple,comprehensive drainage design principle and increase pavement structure layer functional principles of asphalt pavement structure combina-tion type selection in road design,and analyzed the types of asphalt pavement structure combination and the influence of each level,in order to improve the stability of pavement structure.

  16. The Comprehensive Application of Nanometer Titanium Dioxide in Asphalt Pavement%纳米二氧化钛在沥青路面中的综合应用

    Institute of Scientific and Technical Information of China (English)

    赵路; 钱国平

    2013-01-01

    In the asphalt pavement application, titanium dioxide nanoparticles as a catalyst be used to degrade automobile exhaust, and improve the mechanical properties and durability of asphalt pavement in a certain extent. This paper summarizes the application of nanometer titanium dioxide in asphalt and asphalt mixture in the above two aspects, and prospect the development of nano titanium dioxide in the direction of the two study.%  纳米二氧化钛可以很好地催化降解汽车尾气,并在一定程度上改善沥青路面的力学性能和耐久性。本文从以上两方面归纳了纳米二氧化钛在沥青和沥青混合料中的中的应用,最后对纳米二氧化钛在这两个研究方向的发展进行了展望。

  17. 探讨沥青路面车辙产生原因及其防治措施%Discussion on the causes and preventive measures of asphalt pavement rutting

    Institute of Scientific and Technical Information of China (English)

    景运峰

    2014-01-01

    This paper introduced simply the mechanism and types of rutting production, analyzed the influence of asphalt mixture, filler and as-phalt ratio, aggregate, filler, asphalt surface layer thickness to rutting, and proposed corresponding prevention measures, in order to reduce the asphalt pavement diseases, prolong the service life of asphalt pavement.%对车辙产生的机理及类型作了简单介绍,分析了沥青混合料、粉胶比、集料、沥青面层厚度对车辙产生的影响,并提出了针对性的防治措施,以减少沥青路面病害的产生,延长沥青路面的使用寿命。

  18. Multifractal Characteristics of Asphalt Concrete Pavement Macrotexture%沥青混凝土路面宏观纹理的多重分形特征

    Institute of Scientific and Technical Information of China (English)

    苗英豪; 宋萍萍

    2013-01-01

    为深入分析沥青混凝土路面表面宏观纹理特征,在12条不同等级的道路上,选取了包含沥青混凝土(AC)、沥青玛蹄脂碎石(SMA)、开级配抗滑磨耗层(OGFC)、微表处(MS)和稀浆封层(SS)等路面类型的35个测试点,利用激光断面仪开展了路面表面宏观纹理断面的现场测试.分析表明,沥青混凝土路面表面宏观纹理断面具有典型的多重分形特征,多重分形谱呈向右的钩形,多重分形谱的分布宽度(△a)反映了路面断面起伏幅度的变化范围,与路面表面平均断面深度(MPD)之间有较为显著的相关性.最小概率子集与最大概率子集的分形维数差(△f(a))表征了路面表面纹理不同起伏幅度的分布情况,从一个新的角度描述了路面表面断面的特征,丰富了对路面表面宏观纹理特征的描述.%To deeply understand the features of asphalt concrete pavement macrotexture, field tests are conducted using laser profile tester at 35 test sites in 12 sections with 5 pavement types including Asphalt Concrete (AC), Stone Matrix Asphalt (SMA), Open Graded Friction Course (OGFC), Micro-Surfacing (MS) , and Slurry Seal (SS). It is shown that profile of asphalt concrete pavement macrotexture has significant multifractal property. All multifractal spectrums are like a hook facing right. The width of multifractal spectrum (△a) indicates the variation range of profile amplitude, which has significant correlation-ship with the Mean Profile Depth (MPD). Fractal dimension difference between the subset with minimum probability and the subset with maximum probability (△f(a)) describes the distribution of profile amplitude which characterizes the pavement macrotexture from another view and is a new choice for asphalt concrete pavement macrotexture charecterization.

  19. Effect of Coupling Interval of Heavy Lorry on Asphalt Pavement%重型货车联轴间距对沥青路面的影响

    Institute of Scientific and Technical Information of China (English)

    丁和平; 何杰; 陈一锴; 刘霞

    2011-01-01

    Different coupling intervals can affect characteristic of asphalt pavement. A 3D FEA model of semi-rigid base asphalt pavement was established with ANSYS software, and a dynamic model of a brand of truck was established with Adams software to analyze the dynamic response of asphalt pavement under non-uniform dynamic load and different coupling intervals of double-axle truck. The results show that the road surface deflection, the bottom stress of asphalt surface layer, the bottom stress of base layer and the bottom normal strain of the asphalt surface layer are smaller when the coupling interval of the truck model is 1 440 mm. So there is an "optimal distance" makes the minimum damage of the asphalt pavement, thus the effect of coupling interval on the damage of road could be considered in the design of heavy lorry.%车辆联轴间距的不同会对路面造成影响,采用ANSYS软件建立半刚性基层沥青路面的三维有限元分析模型,采用Adams软件建立某品牌重型货车的车辆动力学模型,分析非均布动载荷下双联轴货车联轴间距不同时路面的动态响应特性.结果表明,该车型在联轴间距为1440mm时,路表动态弯沉、沥青面层层底应力、基层层底应力以及沥青面层层底正应变较小.可见,存在一个对于路面的“最优间距”使得车辆对路面的破坏最小,故在重型货车设计时可以兼顾联轴间距对道路的损伤.

  20. 信息动态%A Research on the Pavement Performance of Warm Mix Buton Mastic Asphalt

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    Compositing modified asphalt mixture is a kind of asphalt mixture which uses Buton Mastic Asphalt(BMA) and warm modifier compound modification. It is proved that the composite modified asphalt mixture technology can greatly reduce the mixing temperature, save energy and protect the environment, and can guarantee good road performance. Employing Buton Mastic Asphalt as modifier can obviously increase the high temperature stability of asphalt mixture, with little impact on low temperature performance.

  1. Investigation of Self Consolidating Concrete Containing High Volume of Supplementary Cementitious Materials and Recycled Asphalt Pavement Aggregates

    Science.gov (United States)

    Patibandla, Varun chowdary

    The use of sustainable technologies such as supplementary cementitiuous materials (SCMs), and/or recycled materials is expected to positively affect the performance of concrete mixtures. However, it is important to study and qualify such mixtures and check if the required specifications of their intended application are met before they can be implemented in practice. This study presents the results of a laboratory investigation of Self Consolidating concrete (SCC) containing sustainable technologies. A total of twelve concrete mixtures were prepared with various combinations of fly ash, slag, and recycled asphalt pavement (RAP). The mixtures were divided into three groups with constant water to cementitiuous materials ratio of 0.37, and based on the RAP content; 0, 25, and 50% of coarse aggregate replaced by RAP. All mixtures were prepared to achieve a target slump flow equal to or higher than 500 mm (24in). A control mixture for each group was prepared with 100% Portland cement whereas all other mixtures were designed to have up to 70% of portland cement replaced by a combination of supplementary cementitiuous materials (SCMs) such as class C fly ash and granulated blast furnace slag. The properties of fresh concrete investigated in this study include flowability, deformability; filling capacity, and resistance to segregation. In addition, the compressive strength at 3, 14, and 28 days, the tensile strength, and the unrestrained shrinkage up to 80 days was also investigated. As expected the inclusion of the sustainable technologies affected both fresh and hardened concrete properties. Analysis of the experimental data indicated that inclusion of RAP not only reduces the ultimate strength, but it also affected the compressive strength development rate. Moreover, several mixes satisfied compressive strength requirements for pavements and bridges; those mixes included relatively high percentages of SCMs and RAP. Based on the results obtained in this study, it is not

  2. 丹通高速公路沥青路面新材料、新工艺的应用%Application of New Material and New Technology of Asphalt Pavement of Dantong Expressway

    Institute of Scientific and Technical Information of China (English)

    刘立安

    2012-01-01

    Several new ideas adopted in Dantong Expressway pavement design are introduced, including rubber asphalt, flame retardant asphalt, warm mix asphalt, large grain size asphalt macadam and cement stabilized macadam base course in the type of closed skeleton compaction.%介绍了丹通高速路面设计采用的一些新的材料和新的工艺,包括橡胶沥青、阻燃沥青、温拌沥青、大粒径沥青碎石以及紧密嵌挤骨架密实型水泥稳定碎石基层。

  3. Composition of abraded dust from asphalt pavement produced using ferrochromium smelter slag (OKTO-aggregate)

    OpenAIRE

    Makowska, Michalina; Leveinen, Jussi; Pellinen, Terhi; Marjamaa, Riikka

    2015-01-01

    This report describes an investigation that took place at Aalto University commissioned by the Finnish Transport Agency about asphalt dust containing OKTO-aggregate. In the fall of 2013, Finnish newspaper headlines began to raise the issue of the occurrence of damaged timing belts in the Oulu region. It seemed to only concern certain models and was found in the form of a dust. The press reasoned that this "mysterious" dust must have originated from the aggregates abraded from the local Oulu r...

  4. 重载交通下不同基层类型沥青路面结构应力分析%Analysis for Structural Stress of Asphalt Pavement of Different Types of Basecourses under Heavy Load Traffic

    Institute of Scientific and Technical Information of China (English)

    伍祥松

    2012-01-01

    基于我国沥青路面设计理论及标准,参考实际沥青路面结构,选取不同的沥青路面结构与材料参数,如结构层厚度、模量和泊松比等,采用BISAR3.0路面力学计算程序计算分析不同基层类型对沥青混凝土路面结构内部应力状态的影响.结果表明,柔性基层路面与半刚性基层路面的破坏机理存在明显差异,为了实现2种路面的优势互补,应将柔性基层与半刚性基层的结构进行合理的优化组合,以弥补柔性基层和半刚性基层沥青路面的缺陷.%Based on design theories and standards for asphalt pavement in China and by reference to actual structures of asphalt pavement, this paper selects different structure and material parameters of asphalt pavement, such as thickness, modulus and Poisson' s Ratio of structural layers, etc. , calculates and analyzes influences of different basecourse types on internal stress states of asphalt concrete pavement structures by means of BISAR3. 0 mechanical calculation program for pavement. The results show that significant differences exist in failure mechanisms of flexible basecourse pavement and semi - rigid basecourse pavement, to realize complementary advantages of two pavements, the structures of flexible basecourse and semi - rigid basecourse should be optimized and combined in a reasonable way to make up defects of flexible basecourse and semi - rigid basecourse pavements.

  5. Evaluation of Permeability of Asphalt Pavement Based on Differential Thermal Infrared of Pavement Surface%基于路表红外差热的沥青混凝土路面渗水性能评价

    Institute of Scientific and Technical Information of China (English)

    李志栋; 黄晓明; 赵洁雯; 郭辉; 许涛; 陈广秀

    2012-01-01

    因离析、荷载、自然等因素的影响,沥青混凝土路面产生密实性不均一以及渗水性能表面差异性,为了改变目前渗水仪检测效率低、代表性差等现状,能够快速、多剖面对其渗水性能进行检测评价.首先,通过试验与有限元方法分析了沥青混凝土路面表面温度及其差异度与其渗水性能的相关性;同时,优选了路表温度差异度的最佳检测方法.研究表明:路表温度差异度与渗水性能相关系数达到0.9747,与传统渗水仪的渗水系数相关性达0.8272,建立了通过红外识别路表温度差异度来检测沥青混凝土路面渗水性能的方法和相应评价标准.另外,开发了连续测速达100 km/h的沥青混凝土路面渗水性红外检测仪,与传统渗水仪相比,检测范围由点变面,效率提高80倍,费用节约58%,并与处治透水的雾封层技术实现数据信息共享.%Because of synthesis effect of the segregation, loads and climate, the densification and permeability of the surface of asphalt concrete pavement is different. To change the status that the detecting efficiency and veracity of permeability detector at present is low and the permeability can be detected quickly and multi-section,firstly, the relativity between the surface temperature difference degree and permeability of asphalt concrete pavement is analyzed by the laboratory experiments and ABAQUS elements, and the detecting way of temperature difference degree optimized. It proved that relativity of the surface temperature difference degree and permeability of asphalt concrete pavement or permeability coefficient by the permeability detector arrived to 0. 974 7 or 0. 827 2, and detecting way of asphalt concrete pavement permeability is established based on the surface temperature difference degree identified by the infrared technology. At the same time, based on this principle the first continuous infrared detector reached l00km/h ,of asphalt concrete pavement

  6. 渗透型养护剂在 BRT 沥青路面的应用研究%Application research of infiltration maintenance agent in asphalt pavement of BRT

    Institute of Scientific and Technical Information of China (English)

    林云腾

    2015-01-01

    本文研究了渗透型沥青路面养护剂对既有沥青路面路用性能的改善效果。以某既有BRT沥青路面为试验路段进行实际工程施工应用试验研究,对比有、无喷洒养护剂的沥青路面前后路用性能变化情况。试验研究表明:在既有沥青路面喷洒一定量的渗透型养护剂后,与未喷洒养护剂的沥青路面相比,沥青路面渗水能力明显降低,沥青混合料的粘结性能有较大的提高,抗滑性能变化不大,高温稳定性有明显提高。%The improvement results for aged asphalt pavement of an infiltration maintenance agent were studied in this paper.Based on the BRT asphalt pavement road section in Fujian province, the experiments in engineering construction application were conducted to compare the performance of asphalt pavement with or without the maintenance agent.The experimental results show that, compared with no spraying maintenance agent, spraying the ration of the infiltration maintenance agent in aged asphalt pavement can result in the dramatically decrease in permeability coefficient of asphalt pavement, greatly improvement in bonding properties of asphalt mixtures, little effect on the depth of pavement structure and significantly enhancement in stability at high temperatures.

  7. 城市道路地下管道对沥青路面结构影响的力学分析%Mechanical analysis of asphalt pavement structure affected by underground pipeline of urban road

    Institute of Scientific and Technical Information of China (English)

    方诗圣; 李宏卓; 李贺才

    2011-01-01

    This paper establishes a three-dimensional finite element model of typical asphalt pavement structure for numerical simulation. Under the asphalt pavement weight and the vehicle load, the laws that the underground pipeline depth and backfill modulus change affect the asphalt pavement are analyzed. Under the asphalt pavement weight, the existence of underground pipelines and trenches changes the local stiffness of the asphalt pavement structure and causes the surface differential settlement.While under the vehicle load, the laws that the different underground pipeline depth and backfill modulus affect the surface settlement and internal forces are revealed. The study provides a theoretical reference for designing and constructing the municipal asphalt pavement structure on the top of the underground pipelines.%文章通过典型沥青路面结构的三维有限元数值模拟,分别计算了在路面重力和车辆荷载作用下,地下管道埋深以及回填土模量变化对沥青路面的影响规律.在沥青路面自重荷载作用下,由于地下管道和沟槽的存在改变了道路结构的局部刚度,路表产生了差异沉降;在车辆荷载的作用下,分析了不同管道埋深和回填土模最对路面沉降和内力的影响规律,为市政道路管道上方路面设计和施工提供了理论参考.

  8. Testing of asphalt mixture thermal conductivity and its influences on asphalt pavement temperature field%沥青路面导热系数测试及其对路面温度场影响的模拟

    Institute of Scientific and Technical Information of China (English)

    李彦伟; 张倩; 谢来斌; 何勇海; 刘建

    2012-01-01

    沥青路面温度场是沥青路面车辙计算和沥青混合料粘弹性分析的重要参数,路面温度场的精确预估涉及到面层各层材料热物理参数的精确测试,因此沥青混合料热物理参数的准确测试变得越来越重要.基于对测试结果重现性和可比性的考虑,采用瞬态热线法进行沥青混合料导热系数的测试,选取几种有代表性的混合料进行了导热系数测试,分析了影响导热系数的因素.基于ABAQUS模拟计算路面温度场分布,通过改变路面上、中、下面层的导热系数,计算路面温度场分布变化的情形,对计算结果的分析发现,上面层导热系数对面层温度场分布的影响更显著,可以预期通过改变上面层导热系数能达到主动改善沥青路面工作温度的目的.%Accurate temperature field estimation is crucial to asphalt mixture's visco-elastic analysis and rutting depth calculation. Temperature filed estimation is closely related to pavement layers' thermal physical parameters. Therefore, precise testing of asphalt mixture physical parameters becomes more and more important. A-mong the thermal physical parameters, testing of thermal conductivity is given special attention because it's one of the most commonly used parameters of asphalt mixture. Hot wire method is considered a suitable method in testing HMA thermal conductivity coefficient and its testing principle is introduced. Thermal conductivities of four types of asphalt mixtures with different gradation are tested using transient hot wire method. And its influencing factors are analyzed. An asphalt pavement structure is modeled and its temperature field distribution was calculated using finite element software ABAQUS. Based on the calculation, it is found that asphalt pavement temperature field distributioVi changes with the change of thermal conductivities of the top layer, mid layer and bottom layer. It can be seen from the simulation result that thermal

  9. Numerical Analysis on Multi-scale Structure of Asphalt Concrete Pavement%沥青路面多尺度结构的荷载响应分析

    Institute of Scientific and Technical Information of China (English)

    陈俊; 黄晓明

    2012-01-01

    In order to explore the stress and strain relation in the pavement layers under traffic load from a meso-structural perspective, the single-scale discrete element model of asphalt pavement structure was built using discrete element method (DEM). The stress and strain at the bottom of the asphalt concrete layer under vertical load were calculated. The validation of discrete element model of asphalt pavement structure was conducted by the comparison of discrete element prediction with the results from the classical program. The distribution and volumetric fraction of coarse aggregate, asphalt mastic and air voids were taken into consideration at the bottom of the asphalt layer in the validated discrete element model to build the multi-scale structure of asphalt concrete pavement. The tensile stress and strain in asphalt mastics and interface between aggregate and mastic were obtained and compared with the results from the single-scale model. Results show that the stress and strain in multi-scale structure is heterogeneous distribution. The tensile stress at the interface between aggregate and mastic is much higher than that in mastic. The ratio of stress at interfaces to the stress in mastics increases as the mastic stiffness decreases. The pavement design based on single-scale model may underestimate the tensile stress at interface between aggregate and mastic and overestimate the tensile stress in mastic.%为了从材料细观结构角度研究沥青路面结构的荷载响应,采用离散元方法,建立了柔性基层沥青路面典型结构模型,并进行了竖向荷载作用下沥青混凝土层应力和应变的计算,通过与经典路面响应程序计算结果的比较,验证了路面结构离散元模型和离散元计算方法的正确性.以验证过的路面结构模型为基础,采用较小的细观尺度描述了沥青混凝土结构层底部位置处粗集料、沥青砂浆和空隙的分布和体积大小,从而建立了路面结构的多尺度模

  10. Mechanics Analysis of Asphalt Treated Permeable Base Pavement%沥青稳定碎石排水基层沥青路面结构力学行为分析

    Institute of Scientific and Technical Information of China (English)

    付军明; 孔令伟; 柯昌波; 党高峰

    2014-01-01

    开级配沥青稳定碎石排水基层沥青路面结构受力特性与传统半刚性基层沥青路面不同,应用基于多层弹性层状体系理论的 BISAR软件通过改变各个结构层的厚度和模量两个因素,计算得到了路面层底应力、最大剪应力和弯沉等力学指标的变化规律,对确定合理沥青稳定碎石排水基层沥青路面结构具有一定指导意义。%The mechanical characteristics of Asphalt treated permeable base (ATPB )is different from one of the traditional semi-rigid base asphalt pavement.Through the range of pavement thickness and modulus the Pavement stresses,Maximum shear stress and deflection are calculated by BISAR.The change law of mechanical characteristics of ATPB asphalt pavement is obtained in this paper.It can be re-fer to determine the ATPB asphalt pavement structure parameter.

  11. Research on Influencing Factors for Compaction Performance of Asphalt Concrete Pavement%沥青混凝土路面压实性能影响因素分析

    Institute of Scientific and Technical Information of China (English)

    韩树峰

    2013-01-01

    The compaction quality of an asphalt concrete pavement has a pivotal role on the long-term performance of the pavement. Focusing on the main influencing factors such as the material composition of asphalt mixture, pavement structure, natural environment conditions, compaction machinery and so on, the impact mode and impact extent on the compaction performance of asphalt pavement are explored and discussed here in detail. The research results could provide some references for the design of asphalt pavement materials, structure and construction.%沥青混凝土路面的压实质量对路面的长期性能具有举足轻重的作用.重点从沥青混合料的组成材料因素、路面结构、自然环境条件、压实机械设备等方面探讨其对沥青路面压实性能的影响方式和影响程度.研究成果可为沥青路面材料和结构设计及施工等方面提供一定的参考价值.

  12. Laboratory performance of asphalt rubber mixtures

    OpenAIRE

    Fontes, Liseane; Trichês, Glicério; Pais, Jorge; Pereira, Paulo; Minhoto, Manuel

    2009-01-01

    Asphalt rubber mixtures are one of the most promising techniques to extend the service life of asphalt pavement overlays. Asphalt rubber binder is composed of crumb rubber from reclaimed tires and conventional asphalt. The asphalt rubber binder can be obtained through wet process in two different systems: tire rubber modified asphalt binder (produced at industrial plants) and continuous blending (produced in asphalt plants). This study presents a laboratory evaluation of asphalt rubber mixtur...

  13. 浅析沥青路面裂缝%Ways to Control the Cracks in the Asphalt Pavement in Municipal Construction

    Institute of Scientific and Technical Information of China (English)

    伏修传

    2012-01-01

    结合工作实践,总结分析了城市道路沥青路面裂缝的形成、危害及裂缝的种类、产生原因,并提出对裂缝的预防和处理措施。%Based on many years of practices,the paper summarizes the causes of cracks in the asphalt pavement of urban roads and the influences of raw materials,design and construction,analyzes the forming,hazards,causes and types of the cracks and proposes some preventive and controlling measures.

  14. 新型改性环氧沥青混合料的性能研究%Study on pavement performance of new type modified epoxy asphalt concrete

    Institute of Scientific and Technical Information of China (English)

    张昭; 李璐; 盛兴跃

    2012-01-01

    This paper manufactured a new type modified epoxy asphalt concrete by laboratory experiments. By comparing it' s Marshall performance, high-low temperature performance, and fatigue performance with American epoxy asphalt concrete, we found that the compatibility of new type modified epoxy asphalt concrete was very good, and it' s pavement performance and flexibility was better than American epoxy asphalt concrete, so it is worth being further extended.%通过室内试验,研制出了一种新型改性环氧沥青混合料,并将其马歇尔性能、高低温性能以及疲劳性能与同类进口产品美国环氧沥青混凝土进行了对比分析,发现所研制的新型环氧沥青混合料不仅相容性好,而且具有更优异的路用性能和柔韧性,值得推广应用。

  15. Mechanism of Fume Suppression and Performance on Asphalt of Expanded Graphite for Pavement under High Temperature Condition

    Institute of Scientific and Technical Information of China (English)

    HUANG Gang; HE Zhaoyi; HUANG Yangcheng; ZHOU Chao; YUAN Xiaoya

    2014-01-01

    Fume suppression mechanisms and the effect of expanded graphite on the performance of asphalt were studied by applying infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and comprehensive thermal analysis (TG, DSC). The experimental results confirm that asphalt which is mixed with expandable graphite will expand in the process of hot mix, and the expanded graphite layer will swell by the light component in the asphalt. The light component in the asphalt and PAHs adsorption on expanded graphite surface or part of the plug in the expanded graphite layer between plates made nucleation crystallization growth. And the Van der Waals force and the bonding of the lattice can effectively restrain the asphalt fume release. Meanwhile, the expanding agent with oxidative can spread into the asphalt, leading to asphalt oxygenated and plastic abate, while the ductility decreases. Expanded graphite, SBS modifier and environment- friendly plasticizers are used to composite modified asphalt. According to asphalt fume release experiment, normal test of asphalt performance, Brookfield viscosity test, RTFOT test and asphalt mixture tests (high temperature stability, low temperature stability, water stability), it has been proven that the modified asphalt’s performance is better than that of matrix asphalt and equivalent to that of SBS modified asphalt. Furthermore, it has good fume suppression effect.

  16. Application of a bio-binder as a rejuvenator for wet processed asphalt shingles in pavement construction

    OpenAIRE

    2015-01-01

    This paper investigates the merits of application of bio-binder to enhance rheological properties of asphalt binder in the presence of wet processed recycled asphalt shingles (RAS). It will further examine the performance and workability of asphalt designed with and without a specified percentage of a bio-binder produced from swine manure and RAS. Bio-binder was introduced to liquid asphalt binder modified with four different percentages of RAS; the high and low temperature properties of each...

  17. A FEASIBILITY STUDY ON USE OF GENERIC MOBILE LASER SCANNING SYSTEM FOR DETECTING ASPHALT PAVEMENT CRACKS

    Directory of Open Access Journals (Sweden)

    X. Chen

    2016-06-01

    Full Text Available This study aims to automatically detect pavement cracks on urban roads by employing the 3D point clouds acquired by a mobile laser scanning (MLS system. Our method consists of four steps: ground point filtering, high-pass convolution, matched filtering, and noise removal. First, a voxel-based upward growing method is applied to construct Digital Terrain Model (DTM of the road surface. Then, a high-pass filter convolutes the DTM to detect local elevation changes that may embed cracking information. Next, a two-step matched filter is applied to extract crack features. Lastly, a noise removal process is conducted to refine the results. Instead of using MLS intensity, this study takes advantages of the MLS elevation information to perform automated crack detection from large-volume, mixed-density, unstructured MLS point clouds. Four types of cracks including longitudinal, transvers, random, and alligator cracks are detected. Our results demonstrated that the proposed method works well with the RIEGL VMX-450 point clouds and can detect cracks in moderate-to-severe severity (13 - 25 mm within a 200 m by 30 m urban road segment located in Kingston, Ontario, at one time. Due to the resolution capability, small cracks with slight severity remain unclear in the MLS point cloud.

  18. a Feasibility Study on Use of Generic Mobile Laser Scanning System for Detecting Asphalt Pavement Cracks

    Science.gov (United States)

    Chen, Xinqu; Li, Jonathan

    2016-06-01

    This study aims to automatically detect pavement cracks on urban roads by employing the 3D point clouds acquired by a mobile laser scanning (MLS) system. Our method consists of four steps: ground point filtering, high-pass convolution, matched filtering, and noise removal. First, a voxel-based upward growing method is applied to construct Digital Terrain Model (DTM) of the road surface. Then, a high-pass filter convolutes the DTM to detect local elevation changes that may embed cracking information. Next, a two-step matched filter is applied to extract crack features. Lastly, a noise removal process is conducted to refine the results. Instead of using MLS intensity, this study takes advantages of the MLS elevation information to perform automated crack detection from large-volume, mixed-density, unstructured MLS point clouds. Four types of cracks including longitudinal, transvers, random, and alligator cracks are detected. Our results demonstrated that the proposed method works well with the RIEGL VMX-450 point clouds and can detect cracks in moderate-to-severe severity (13 - 25 mm) within a 200 m by 30 m urban road segment located in Kingston, Ontario, at one time. Due to the resolution capability, small cracks with slight severity remain unclear in the MLS point cloud.

  19. Performance Evaluation of Asphalt Modified with Municipal Wastes for Sustainable Pavement Construction

    Directory of Open Access Journals (Sweden)

    Muhammad Nasir Amin

    2016-09-01

    Full Text Available The severe hot temperature and high traffic loadings in the Kingdom of Saudi Arabia (KSA are causing distress in flexible pavements within a few years of service. Secondly, the conventional bitumen extracted from Saudi oil refineries have a performance grade of 64-10 (PG 64-10, which does not meet the SuperPave performance grade requirement for most of the KSA’s regions. In order to improve the performance grade of bitumen, different percentages of municipal wastes (plastic and crumb rubber were used as bitumen additives. The performance of bitumen at low, intermediate, and high temperatures was evaluated. This is important as the waste production is rising significantly due to the fast urbanization and high population growth in the KSA. Particularly, when there are very few ways of recycling these wastes (municipal, as well as industrial, which in fact have great impact on the environment. High-density polyethylene (HDP, low-density polyethylene (LDP, and crumb rubber (CR with 5%, 10%, and 15% by weight of bitumen, were mixed with the base bitumen (PG 64-10. Rotational viscometer (RV, dynamic shear rheometer (DSR, and bending beam rheometer (BBR were used to evaluate the viscosity, rutting, fatigue, and low-temperature behavior of base and modified binders. The test results indicated that the rutting (permanent deformation and fatigue resistance were significantly improved in modified binders due to the improvement in the visco-elastic properties.

  20. Research on the Cold Recycling Construction Technology of Asphalt Pavement%沥青路面冷再生施工工艺研究

    Institute of Scientific and Technical Information of China (English)

    王超平

    2014-01-01

    Asphalt pavement cold recycling construction tech-nology is one of new construction technology in local traffic road. In our existing system of highway construction, more th-an 60%are asphalt roads, and in some old road reconstruction and repair process, the most commonly used method is to dis-card the old pavement, this method is not only a serious waste of resources and has damage to the environment.%沥青路面冷再生施工工艺是基层交通路面施工的新型工艺之一。在我国现有的公路建设体系中,60%以上都是沥青公路,而在一些旧路改造和修补过程中,最常用的手段是把破旧路面丢弃,这种方法不仅严重浪费资源而且会对环境造成损害。

  1. 不同结构类型沥青路面的吸放热特性研究%Studies of Asphalt Pavement for Different Structural Types on Suction Exothermic Properties

    Institute of Scientific and Technical Information of China (English)

    吕振北; 荣丽娟; 韩之栋; 范文东

    2012-01-01

    The paper Studies on Suction and exothermic law of asphalt absorb for reducing temperature of asphalt pavement and improving rutting-resistance of asphalt pavement have important strategic significance. This paper studies the suction and exothermic regular pattern of existing three types,five kinds of asphalt pavement structure. It turns out that there are differences in suction and exothermic characteristics of different types of pavement structure. Suspension close -grained type structure has higher adiabatic heating; gap-type skeleton has faster speed of suction and exothermic) and dense skeleton has more total quantity of heat storage.%研究沥青混合料吸放热规律,对降低沥青路面温度提高抗车辙能力具有重要的战略意义.文中通过对现有3种类型、5种结构沥青路面吸放热规律进行研究,结果显示,不同类型路面结构吸放热特性存在差异:悬浮密实型结构绝热升温高;骨架空隙型吸、放热速度高;骨架密实型总储热量大.

  2. 柔性基层和半刚性基层沥青路面有限元对比分析%Finite Element Comparative Analysis for Asphalt Pavement with Flexible Base Course and Semi-rigid Base Course

    Institute of Scientific and Technical Information of China (English)

    刘鹏飞; 杨刚; 梁乃兴

    2013-01-01

    Based on graded gravel bearing plate test this paper establishes formulae of constitutive model of nonlinear bearing capacity of base course materials of graded gravel and builds planar model of typical structure of asphalt pavement with flexible base course by means of ANSYS universal finite element software.The paper analyzes structural stress of asphalt pavement with aggregate base course and semirigid base course,including propagation laws of stress and strain of asphalt pavement with flexible base course under different stress conditions and propagation differences of stress and strain from asphalt pavement with semi-rigid base course.%通过级配碎石承载板试验建立级配碎石基层材料的非线性承载力本构模型公式,利用ANSYS通用有限元软件建立柔性基层沥青路面典型结构平面模型.对粒料基层沥青路面和半刚性基层沥青路面结构受力进行分析,包括柔性基层沥青路面在不同受力条件下应力、应变的传播规律以及与半刚性基层沥青路面之间的应力、应变传播差异.

  3. 走出沥青路面设计误区的哲学思考%Philosophical Thought about Stepping Out of the Misleading Area of Asphalt Pavement Design

    Institute of Scientific and Technical Information of China (English)

    吴传海

    2012-01-01

    In the view of philosophy, this paper analyzes the dialectical rules in the asphalt pavement design in China. It also explores the conception of asphalt pavement design in our country, as well as the methodology of design and some indexes about it. It points out the misleading areas in the combination design of asphalt pavement structure and the composition design of materials. It, to some extent, provides illumination and guidance to the scientific design of asphalt pavement.%从哲学的角度剖析了我国沥青路面设计中的辩证规律,探讨了我国沥青路面设计理念、设计方法和指标,以及沥青路面结构组合设计和材料组成设计中存在的一些“误区”,为科学地进行沥青路面设计提供了一定的启发和参考作用。

  4. 南京铁心桥钢桥面热拌环氧混凝土铺装工艺研究%Hot-mixing Epoxy Asphalt Concrete Pavement Technology for Steel BridgeDeck Pavement of Tiexin Bridge in Nanjing City

    Institute of Scientific and Technical Information of China (English)

    潘军; 杨文

    2016-01-01

    Based on the steel bridge deck pavement engineering of Tiexin bridge in Nanjing city,the pavement technologies of hot mixing epoxy asphalt concrete using on steel deck were studied,inclu-ding the pavement structure design,mix design,pavement performance evaluation and construction technology.The difference of pavement construction between hot mixing and warm mixing epoxy as-phalt were also introduced in this paper.Research results show that hot mixing epoxy asphalt is suit-able for steel deck pavement due to its high stability,excellent high temperature performance and con-venient workability.%结合南京铁心桥钢桥面环氧铺装实体工程,对热拌环氧沥青混凝土铺装结构形式、热拌环氧沥青性能与混合料配合比设计、路用性能评价,以及施工工艺进行了系统研究,全面比较了热、温拌环氧沥青铺装施工工艺的区别。结果表明,热拌环氧沥青混凝土具有高强度、出色的高温稳定性,以及便捷的施工可操作性,非常适用于大跨钢桥铺装工程。

  5. Discussion on Quality Control Standard of Asphalt Pavement Compaction Degree%沥青路面压实度的质量控制标准探讨

    Institute of Scientific and Technical Information of China (English)

    穆秀雯; 龚莉; 张锦生

    2011-01-01

    以依七高速公路沥青路面施工为依托,对沥青混凝土路面压实度的质量控制标准进行了探讨。结果表明:采用马歇尔标准密度和最大理论相对密度双重标准进行控制,能够真实、有效的反映路面实际压实情况。当芯样空隙率大于设计空隙率4.12%时,以马歇尔试件为标准密度计算的压实度值可能出现超百假象,此时试件不能真实的反映沥青路面的压实状态,因此建议按照两项质量控制标准相一致的原则,通过数理统计的方法对K1值进行线性回归,用回归后的压实K′2度表示此时的压实度。%Based on the asphalt pavement construction of Yi-lan and Qi tai-he highway, quality control standards on compaction degree of asphalt concrete pavement was discussed. Results show that, with double standards of Marshall standard density and the theoretical maximum relative density, the actual compaction condition of pavement can be truly and effectively reflected. When a core sample porosity is 4. 12% greater than design porosity, the compaction degree value calculated by Marshall specimens may shows a false illusion of over one hundred, which can not truly reflect the real compaction state of the asphalt pavement. Therefore, it is recommended to calculate the compaction degree with the principle of two quality control standards be consistent with each other. Through the method of mathematical statistics, linear regression can be conducted to K1 , and the compaction degree of K′2 after regression is the real value.

  6. Experimental Research on Surface Characteristics of Epoxy Asphalt Concrete Pavement%环氧沥青混凝土铺装表面特性试验研究

    Institute of Scientific and Technical Information of China (English)

    罗桑; 钱振东

    2012-01-01

    To evaluate the surface characteristics of epoxy asphalt concrete pavement,the permeability test,dynamic friction test,Cantabro test,Hamburg test,and laser texture scanning test were conducted.Results show that the coefficient of water permeability of epoxy asphalt concrete is zero,the british pendulum number is 83.6,the mass abrasion rate is 12.5%,the mean profile depth is 0.305 mm,and the estimated texture depth is 0.432 mm.Results show that the water is held into steel deck,because the waterproof performance of epoxy asphalt concrete pavement is excellent.The skid resistance is qualified for the design of bridge deck pavements,but skid of a vehicle occurs when the speed of the vehicle is high on rainy days.Raveling happens under high-temperature water and tire contact loading.The smoothness of epoxy asphalt concrete pavement is good.The surface characteristics of epoxy asphalt concrete pavement satisfy design requirement.However,skid and raveling occur under adverse weather conditions.%为了解环氧沥青混凝土铺装的表面特性,采用渗透性试验、摆式摩擦系数试验、动态摩擦系数试验、肯塔堡飞散试验、汉堡车辙试验和激光纹理扫描试验,对环氧沥青混凝土铺装的渗水性能、抗滑性能、抗松散性能以及表面纹理特征等表面特性进行了试验评价.试验结果显示,环氧沥青混凝土铺装的渗水系数基本为0,摆式摩擦系数为83.6,飞散损失率为12.5%,轮廓深度平均值为0.305 mm,纹理深度估计值为0.432 mm.研究表明,环氧沥青混凝土铺装密水性好,能有效阻止雨水侵蚀钢桥面板;抗滑性能满足设计要求,但在雨天车辆行驶速度高时,易出现车辆打滑现象;抗松散能力较好,但在高温水浴和钢轮轮载的双重作用下,混合料会出现松散和剥落情况;环氧沥青混凝土铺装表面平整度好.环氧沥青混凝土铺装层表面特性符合钢桥面铺装层的设计使用要求,但在不利天气条件下,

  7. Material Requirements and Mix Design of Permeable Asphalt Pavement%透水沥青混凝土路面材料要求及配合比设计

    Institute of Scientific and Technical Information of China (English)

    宋春晖

    2015-01-01

    透水沥青混凝土路面具有快速排水、防滑、降噪、环保等多重功能,得到广大公路建设者的普遍重视。本文从透水沥青混凝土路面的分类、适用范围出发,重点论述了透水沥青混凝土路面材料组成及要求、路面及基层的配合比设计以及路面结构厚度的验算方法。%Permeable asphalt pavement has many functions, such as rapid drainage, skid resistance, noise reduction, environmental protection, and so on. The article starts from the classification of permeable as-phalt pavement, and scope of application, and puts an emphasis on the permeable asphalt pavement material composition and requirement, pavement and base with the calculation method of design and pavement struc-ture thickness.

  8. Problems Should Pay Attention to in the Asphalt Pavement Design Method%浅析沥青路面设计方法中应注意的问题

    Institute of Scientific and Technical Information of China (English)

    郝有斌

    2013-01-01

    The design of asphalt pavement is complex system engineering, and it is very difficult to design pavement structu-re reasonable. This paper mainly discusses the measures to sol-ve the problem, and many problems in the design of asphalt p-avement, the current application process. It is helpful to the de-sign of asphalt pavement and cement concrete pavement desi-gn for quality improvement, which can be used for reference.%  沥青路面的设计是一个较为复杂的系统工程,而且很难设计出经济合理的路面结构。本文主要讨论解决这一问题的措施,以及在现行的沥青路面设计、应用过程中的诸多问题。它有助于沥青路面设计和混凝土路面设计质量的提升,可供同行参考。

  9. 冷拌冷铺技术在农村公路沥青路面修补中的应用%Application of Cold Mix and Cold Pavement Patching. of Laid Technology in Asphalt Rural Highway

    Institute of Scientific and Technical Information of China (English)

    李曙光

    2012-01-01

    Through a large number of indoor and outdoor experimental researches, road performance of cold mix asphalt and cold mix and cold laid asphalt mixture is analyzed. The results show that cold mix and cold laid technology can meet the requirements of rural highway pavement maintenance. The construction technology is sim- ple and practicable, which is worthy of being applied in asphalt pavement maintenance of rural highway.%通过大量的室内外试验研究,对冷拌沥青及冷拌冷铺沥青混合料的路用性能进行研究,结果冷拌汽铺技术能够满足农村公路路面维修养护的需求,且施工工艺简单易行,值得在农村公路沥青路面养护中推广应用。

  10. 含盐高湿环境下沥青混合料耐久性%Durability of Asphalt Pavement Under Salty and Humid Environment

    Institute of Scientific and Technical Information of China (English)

    张争奇; 王志祥; 李志宏; 郭寒萍

    2015-01-01

    In order to study the rutting performance of asphalt pavement under salty and humid environment, tests on the condition of different temperatures and different salt solution concentrations were conducted applying laboratory Hamburg rutting test, by which the different types of durability of the asphalt mixture were compared. The Origin 8.0 was used to analyze the correlation of the results from plate and cylindrical specimens. Not only the cylindrical specimen rutting test conditions were determined, but also the salty humidity environment durability test conditions and the evaluation index were put forward. At last the erosion mechanism of salty and humid environment on the asphalt pavement was analyzed. The results show that modified asphalt binder can significantly improve the salt durability of the asphalt mixture under high humidity environment. It has poorer durability for the ordinary AC mixture than that of other. However, the durability of SMA mixture is better than that of other types of mixture under high humidity environment; cylindrical specimen immersion rutting deformation rate under the temperature of 60 ℃, 70 ℃ can be used to evaluate the durability of asphalt pavement and detection index. High temperature, salt, water, and the coupling effects are the main reasons for decreasing the durability of asphalt mixture.%为了研究含盐高湿环境下沥青混合料的耐久性,以不同温度和不同质量浓度盐溶液模拟含盐高湿环境进行汉堡车辙试验,并通过试验比较不同类型沥青混合料在含盐高湿环境下的耐久性,使用Origin 8.0对板状和圆柱形的车辙试验结果进行非线性指数拟合,提出含盐高湿环境沥青混合料耐久性的试验评价指标和检测方法,最后分析含盐高湿环境对沥青混合料的侵蚀机理.结果表明:采用改性沥青作结合料可以显著提高含盐高湿环境下沥青混合料的耐久性;含盐高湿环境下,普通AC混合料

  11. Calculation of the temperature of asphalt concrete at making the joints of multilane road pavement of non-rigid type

    OpenAIRE

    Giyasov Botir Iminzhonovich; Kupriyanov Roman Valer’evich; Andrianov Konstantin Anatol’evich; Zubkov Anatoliy Fedorovich

    2015-01-01

    The construction quality of road surface of non-rigid type essentially depend on providing the temperature regimes in the process of laying and packing of hot asphalt concrete mixtures. In order to provide the required characteristics of asphalt concrete due to the surface width it is necessary to provide the temperature regimes of hot asphalt concrete mixture in the zones of lane connection. The hot mixture is promptly cooling right after laying within several minutes, which results, accordi...

  12. Dynamic Response Analysis with 3D Finite Element Method for Two Typical Kinds of Asphalt Concrete Pavements with Saturated Asphalt Layer%两种典型沥青混凝土路面结构沥青层饱水状态动力响应三维有限元分析

    Institute of Scientific and Technical Information of China (English)

    任瑞波; 祁文洋; 徐强

    2011-01-01

    水和动态荷载耦合作用是沥青混凝土路面发生水损害的主要原因.首先基于多孔介质理论,假定路面结构中的沥青混凝土材料为完全饱水的多孔介质材料,对两种典型路面结构--半刚性沥青混凝土路面、具有柔性基层的半刚性沥青混凝土路面分别建立了三维有限元模型;而后对比分析了两种路面结构在动态荷载作用下的竖向应力、竖向应变、孔隙水压力的空间分布情况以及时程变化规律.结果表明:具有柔性基层的半剐性沥青混凝土路面结构具有较好的抗水损害性能,半刚性沥青混凝土路面结构则表现出较差的抗水损害性能.%The coupled moisture-loading action is the primary factor of initial failure for asphalt concrete pavement. At first, based on the porous media theory , assuming the asphalt concrete as saturated porous media material,two three-dimensional finite element models are established for two typical kinds of asphalt concrete pavements which included the semi-rigid base asphalt concrete pavement, the semi-rigid base asphalt concrete pavement with flexible base. Then the comparison and analysis of the spatial distribution and time change regulation for asphalt concrete pavement between the two kinds of structures are carried out which included vertical stress, vertical strain, and pore pressure. The result indicates that the semi-rigid asphalt concrete pavement stucture with flexible base shows the best performance of resisting the moisture damage, relatively the semi-rigid asphalt pavement structure gives the worse performance.

  13. Analysis of Mechanical Response of Wheel Load on Semi -rigid Base Asphalt Pavement Structure%车轮荷载对半刚性基层沥青路面结构的力学响应分析

    Institute of Scientific and Technical Information of China (English)

    徐伟杰

    2012-01-01

    Based on the theory and standards of the asphalt pavement design, typical semi - rigid asphalt pavement structure and material parameters were chosen. To calculate the stress, strain, displacement of the pavement structure under different loads BISAR3.0 software was adopted and analyzed the impact of the mechanical indicator on the pavement structure. The results show that the impact of different load patterns on the pavement structure is quite large, which can provide a useful reference for further explaining the pavement damage phenomenon of the%基于我国的沥青路面设计理论及标准,选取典型半刚性基层路面结构及材料参数,采用BISAR3.0软件对不同荷载作用下的路面结构应力、应变和位移进行计算,并分析了各力学指标对道路结构的影响。结果显示:不同荷载模式对路面结构的影响相当大,这对进一步解释路面面层的一些破坏现象提供了有益的参考。

  14. Structural Design and Mechanical Analysis of Full-Depth High Modulus Asphalt Concrete Pavement%全厚式高模量沥青混凝土路面结构设计及力学分析

    Institute of Scientific and Technical Information of China (English)

    李涛; 刘宁; 张涛

    2013-01-01

    The pavement special program PADS is used to calculate the three kinds of asphalt concrete pavement structure thickness which are full-depth high modulus, full-depth ordinary and semi-rigid base asphalt concrete pavement, respectively. The 3-D element model of asphalt concrete pavement structure is built based on the elastic mechanics to evaluate the design bottom stress state under loads. The rutting of the three kinds of pavement is determined by using asphalt concrete pavement permanent deformation prediction method in MEPDG of the United States. Also, their fatigue life is calculated. The results show that the full-depth high modulus asphalt concrete pavement structure is able to effectively decrease the thickness of the pavement structure, at the same time exhibits the best overall performance in rutting resistance and fatigue properties.%利用路面专用程序PADS计算全厚式高模量、全厚式普通和半刚性基层3种沥青混凝土路面结构厚度;根据弹性层状理论体系,建立了上述3种沥青混凝土路面结构三维有限元模型,对路面结构在荷载作用下的设计层层底应力状态进行对比分析;应用美国MEPDG推荐的沥青混凝土路面永久变形预估方法对沥青混凝土路面结构进行车辙预估,并对其疲劳寿命进行了计算.结果表明,全厚式高模量沥青混凝土路面结构能够有效减薄路面结构厚度,是抗车辙性能及疲劳性能综合最优的路面结构类型.

  15. On influence of equivalent modulus of original pavement on design for large-scale repair for asphalt roadbeds%原路面当量模量对沥青路面大修设计的影响

    Institute of Scientific and Technical Information of China (English)

    王鑫

    2012-01-01

    The paper adopts the GAMES program to analyze the influence of the various equivalent modulus of original pavement on the roadbed structure in the large-scale repair of the asphalt pavement, and researches the relative relationship between the deflection value of the roadbed before the milling-planing and the equivalent modulus of original pavement after the milling-planing, so as to improve the reasonability of the equivalent modulus of original pavement after the milling-planing.%应用GAMES程序分析了原路面当量模量取值不同时对沥青路面大修路面结构的影响,并研究了铣刨前路面弯沉值与铣刨后原路面当量模量之间的相关关系,以提高铣刨后原路面当量模量取值的合理性。

  16. 半刚性基层双层排水降噪沥青路面结构计算分析%Calculation and Analysis on Double Drainage Noise Reduction Asphalt Pavement Structure of Semi-rigid Base

    Institute of Scientific and Technical Information of China (English)

    汪军伟

    2016-01-01

    双层排水降噪路面具有显著的排水和降噪性能,在欧洲国家得到越来越多的应用,但都是基于柔性基层的路面结构。通过对基于半刚性基层的普通沥青路面、单层排水降噪沥青路面和双层排水降噪沥青路面结构的弯沉、层底拉应力进行计算分析,并对不同路面结构进行比较分析,衡量半刚性基层双层排水降噪沥青路面结构的可行性。计算结果表明,半刚性基层双层排水降噪沥青路面顶面的弯沉值小于路面设计弯沉值,路面结构强度满足设计要求。%Double drainage noise reduction pavement has significant drainage and noise reduction per-formance,which gets more and more applications in European countries,but they are based on the pavement structure of flexible base layer.The calculation and analysis on the deflection and bottom layer tensile stress of ordinary asphalt pavement,single drainage noise reduction asphalt pavement, and double drainage noise reduction asphalt pavement are performed based on the semi-rigid base,and the comparative analysis of different pavement structures are made to measure the feasibility of double drainage noise reduction asphalt pavement of semi-rigid base.The results show that,the top surface deflection of double drainage noise reduction pavement of semi-rigid base is less than the design value, and the pavement structural strength meets the design requirements.

  17. Purification effectiveness of runoff pollution by the permeable asphalt pavement%透水沥青路面对路面径流污染的净化功效

    Institute of Scientific and Technical Information of China (English)

    宋秋霞; 徐勇鹏; 鄂勇

    2009-01-01

    In order to investigate the purification effect of new type permeable asphalt pavement material on runoff pollution, storm water samples collected from Songshan road in Harbin were determined. The results showed that the pervious asphalt pavement had good purification effect on the COD, SS, turbidity, Pb and Zn in the effective porosity of 12.1%-23.0%, in addition, the purification effect of pervious asphalt pavement intermingled with 40% ceramsite on runoff pollution was much better than that of groundmass pavement.%为探讨新型路面材料对路面径流污染的净化功效,对哈尔滨嵩山路路段路面径流排水进行取样分析.结果表明,透水沥青路面对径流污染因子COD、SS、浊度、Pb、Zn均有良好的净化作用.其净化有效空隙率范围为12.1%~23.O%.掺混陶粒率为40%的透水沥青路面对径流污染的净化功效明显优于纯沥青路面.

  18. Analysis of finite element and mechanical response in granular base asphalt pavement%粒料基层沥青路面有限元和力学响应分析

    Institute of Scientific and Technical Information of China (English)

    马骁尧; 高启聚

    2016-01-01

    The paper compares mechanical properties of the granular base asphalt pavement and semi-rigid base asphalt pavement by finite ele-ment analysis method. Besides, the paper calculates 34 kinds of representative pavement structures with granular base. The result shows that the surface deflection of granular base is larger than that of semi-rigid base. But the tensile stress below the base layer of asphalt pavement with semi-rigid base is much larger than that of granular base. Meanwhile, the paper provides the principal law and principal range of granular base and granular subbase.%利用有限元分析法,比较分析了粒料基层沥青路面和半刚性基层沥青路面的力学特性,计算了34种具有代表性的粒料基层路面结构的主应力,研究结果表明:粒料基层较半刚性基层会产生更大的路表弯沉;而半刚性基层层底拉应力比粒料基层大得多,同时得到粒料基层、底基层主应力分布规律及分布范围.

  19. Research on Design of Reconstruction Structure of Trunk Highway Asphalt Pavement in Central South China%中南地区干线公路沥青路面改建结构设计研究

    Institute of Scientific and Technical Information of China (English)

    张明

    2014-01-01

    According to the weather conditions, traffic conditions and other factors of central south China, the present situation for the sections of asphalt pavement maintenance and transformation, proposed flexible base pavement pro-gram and semi-rigid asphalt pavement structure program, on the design methods of asphalt pavement in china, AASHTO and software of BISAR, calculation and analysis of the program of overlay structure.%根据中南湖区当地气候条件及交通状况等因素,针对该路段沥青路面维修改造的现状,提出了柔性基层沥青路面结构方案和半刚性基层沥青路面结构方案,采用我国沥青路面设计方法、AASHTO设计方法和BISAR软件对路面加铺结构方案进行计算和分析。

  20. 高寒地区沥青路面设计%Asphalt Pavement Design in High Latitudeand Cold Regions

    Institute of Scientific and Technical Information of China (English)

    程军勤

    2015-01-01

    Combining with the development of highway pavement and key factors in pavement design,the selection of pavement structural layers in high latitude and cold regions is discussed in this paper,which can be seen as preference to similar projects.%从青海省公路路面设计的发展及设计中的关键要素等方面入手,探讨了高寒地区路面各结构层的选择,为同类地区的路面设计提供参考。

  1. Prediction of Rutting of Asphalt Pavement Based on Combined Model%基于组合模型的沥青路面车辙预测

    Institute of Scientific and Technical Information of China (English)

    张琛; 汪海年; 王宠惠

    2016-01-01

    To predict the rutting of asphalt pavement, Pavement-Me prediction model ( PME) with the localized input parameter and a dynamic grey prediction model (DGM (1,1)) with data timeliness were established based on the PME and grey prediction theory, in the current rutting situation in a highway of Shaanxi Province. The mathematical statistic method was used to conduct the prediction research of rutting based on a combined model. The results reveal that the fitting precision of PME model is 0. 963, and the DGM (1,1) model is 0. 941, which can be used as a submodel of the combined model. The prediction precision of DGM-PME combined model is higher than that of single submodel, in which the combined model which adopts error square and reciprocal weighting has the highest prediction precision, and its rank allocation is L12 =0. 601 and L22 =0. 399, the maximum of prediction precision can be 0. 0045 . The prediction result of the combined model at some periods is inferior to that of some single prediction models, which belongs to normal error range. It is feasible to replace the single model with the DGM-PME combined model to predict the rutting of asphalt pavement. And it is more suitable to use the combined model established in this paper to predict rutting development tendency for the project-level asphalt pavement.%为了对沥青路面车辙进行预测研究,结合陕西某高速公路沥青路面的车辙病害现状,以美国AASHTO新力学经验法中的Pavement-ME预测模型( PME模型)和灰色预测理论为基础,对PME预测模型的参数进行了本地化处理,提出了考虑数据时效的动态灰色预测模型DGM (1,1),并采用数理统计方法对车辙的发育趋势进行基于组合模型的预测研究.研究结果表明:PME模型和DGM灰色模型的拟合精度分别为0.963和0.941,可以作为组合模型的子模型;DGM-PME组合模型的预测精度要高于单一子模型的预测精度,其中采用误差平方和倒数法定权得到

  2. 沥青路面就地热再生列车应用研究%Investigation of Application Effect of Hot In-place Recycling Equipment for Asphalt Pavement

    Institute of Scientific and Technical Information of China (English)

    马涛; 李春雷; 张建; 黄晓明

    2011-01-01

    为进一步提高就地热再生技术在沥青路面快速养护维修中的应用效果,结合室内试验与实际工程,对RM型就地热再生列车的间歇式热辐射加热墙和液压气动式耙松设备的施工效果进行了研究.分析表明,相对于传统的加热方式,加热墙能快速均匀地加热路面,且不进一步老化原路面沥青;耙松齿能快速均匀地翻松加热后路面,且保持原材料级配不变;经RM热再生列车再生施工后的沥青混合料及路面具有良好的路用性能,且具有优良的层间黏结,提高了施工质量,延长了再生沥青路面使用寿命.%To reduce the limitation of equipment on hot in-place recycling technology application and improve the application effect of hot in-place recycling technology in asphalt pavement maintenance, the application effect of two key equipments of hot in-place recycling train, the Intermittent Heating Wall (IHW) and the Hydropneumatic Scarifying Device ( HSD ), are investigated based on theoretical analysis, laboratory tests and field tests. And the construction effect and quality of the hot in-place recycling train are evaluated based on laboratory performance tests of recycling asphalt mixture and field performance tests of testing roads. The results indicate that compared with the traditional heating device, the IHW can heat the asphalt pavement faster and more uniformly without further aging the asphalt binder of pavement; compared with the traditional milling device, the HSD can scarify the heated pavement faster and more uniformly without changing the original aggregate gradation of pavement; and finally, the recycling asphalt mixture and pavement produced by the hot inplace recycling train have good road performance and interlaminar bonding. Therefore, the improved hot in-place recycling train is proved to be promising in hot in-place recycling pavement with good construction quality and service life.

  3. Analysis on Infiltration Capacity in Asphalt Pavement Subjected to Dynamic Hydraulic Pressure%动水压力作用下沥青路面渗水量影响分析

    Institute of Scientific and Technical Information of China (English)

    高俊启; 盛余祥; 张世铎; 于凤强; 蒋泽民

    2013-01-01

    It is important of infiltration capacity for the drainage design in asphalt pavement.In order to calculate infiltration capacity in asphalt pavement subjected to dynamic hydraulic pressure,the dynamic hydraulic pressures in asphalt pavement at some running speeds are measured,and the relationship of the hydraulic pressure and car speed is built.Furthermore,a falling head permeameter method is used to measure the permeability coefficients of asphalt mixture exposed to hydraulic pressures whose peak values are from 40 to 350 kPa,and the correlation between permeability and hydraulic pressure is obtained.In addition,a dynamic permeability test system is presented to measure the dynamic permeability of asphalt mixture subjected to vehicle impulsive pressures,and the calculation formula for calculating infiltration capacity in asphalt pavement subjected to dynamic hydraulic pressure is established.The results show that the infiltration capacity is proportionate to the permeability coefficient and effective tire ground area respectively,and is inversely proportional to the thickness of asphalt pavement.The infiltration capacity decreases with the increment of car's speed.%沥青路面渗水量对于沥青路面内部排水设计非常重要.为计算动水压力作用下沥青路面渗水量,实地测试了不同车速下沥青路面表面的动态水压力数值,建立了动态水压力与车速的关系.根据变水头试验方法,测试了沥青混合料芯样在40~350 kPa水压力下的渗透系数,建立了沥青混合料渗透系数与水压力的关系.为研究路面在交通荷载作用下的动态渗透性能,设计了动态渗透试验测量系统.建立了动水压力作用下沥青路面渗水量的计算模型.结果表明:沥青路面渗水量与路面渗透系数、轮胎有效接地面积成正比,与路面厚度成反比;随车速增加,动水压力作用下沥青路面渗水量减小.

  4. Research on elastic modulus backcalculation of asphalt course using BP artificial neural network based on surface deflection basin of pavement%基于路表弯沉盆的BP人工神经网络反演沥青面层弹性模量研究

    Institute of Scientific and Technical Information of China (English)

    杨国良; 钟雯; 黄晓韵; 梁思敏; 何慧慧; 陈家驹

    2015-01-01

    Based on layered elastic theory,the elastic modulus of asphalt course in asphalt pavement was predicted using BP artificial neural network.According to the types of pavement structure in common use,the database of surface deflections with their corresponding structural parameters of asphalt course based on layered elastic theory was established.The elastic modulus backcalculation model of asphalt course in asphalt pavement was developed using BP artificial neural network to predict.The predictive results of asphalt course elastic modulus backcalculation using theoretical deflection basin and measured deflection basin indicate that the elastic modulus backcalculation model of asphalt course in asphalt pavement is of good predictive accuracy and reliability.It would provide the references with the elastic modulus backcalculation model of asphalt course to accurately and quickly estimate the conditions of asphalt course in asphalt pavement.%基于层状弹性体系理论,建立BP人工神经网络反演沥青路面沥青面层弹性模量预测模型,利用BP人工神经网络预测沥青路面沥青面层弹性模量.理论弯沉盆和实测弯沉盆反演沥青面层弹性模量的结果表明,建立的BP人工神经网络反演沥青路面沥青面层弹性模量模型具有良好的预测精度和可靠性,为评价沥青路面的沥青面层性能状况提供了参考.

  5. Analysis of Asphalt Pavement Structural Premature Damage Position and Countermeasure%沥青路面结构早期损坏层位分析及对策研究

    Institute of Scientific and Technical Information of China (English)

    谭忆秋; 姚李; 王海朋; 杜群乐; 党奇志

    2012-01-01

    In order to analyze the positions of premature damage occurred in asphalt pavement, the common semi-rigid base asphalt pavement was modeled by finite element method. The stress and strain characteristics of asphalt pavement structural layers under dynamic and static loads and the maximum shear stress varying with depth were simulated and analyzed. Major types of pavement premature damage position and the damage resistance characteristics which different layers should have were analyzed from the perspective of pavement mechanical response. Then the trial research to fight against premature damage was carried on. The results show that (1) the 3D compression stress fluctuates in 0 - 3 cm depth from pavement surface; (2) the area of 2-10 cm depth from pavement surface belongs to high shear stress area where the rutting may occurr easily; ( 3) the bottom layer of asphalt pavement bears tensile stress under static load and tension-compression stress under cyclic loads, and fatigue damage may occurr easily.%为了分析沥青路面结构早期损坏发生的层位,采用有限元方法对目前常见的半刚性基层沥青路面建模,模拟分析了动静荷载作用下沥青路面各结构层的应力应变特性及最大剪应力随路面深度变化特点,从路面力学响应的角度分析了路面早期病害类型出现的层位以及各个层位应具备的抗病害的特性,进而对抗病害时策进行了试验路研究.研究结果表明,距沥青路面路表0~3 cm的区域应力三向受压应力波动较大;距路表2~10 cm的区域属于高剪应力区域,易发生车辙;沥青路面层底在静栽作用下受拉应力作用,在循环动载情况下受拉压重复作用易发生疲劳破坏.

  6. 不同类型基层沥青路面设计指标的控制%Control of designing indices for asphalt pavement with different types of base

    Institute of Scientific and Technical Information of China (English)

    张艳红; 申爱琴; 郭寅川; 王学礼; 冯亚军

    2011-01-01

    Based on the reconstruction and extension project of Xitong expressway, the fatigue and breakage forms of semi-rigid asphalt pavement, compound base asphalt pavement and flexible base asphalt pavement were analyzed and the corresponding design parameter system was established separately. The sensibility of the materials parameter as the mechanical responses was analyzed using Shell designing software Bisar3. 0, which verified the rationality of pavement designing indices from the point of stress balance. The results show that taking flexible strain and surface shear stress as designing indices for flexible pavement could keep the modulus value of semi-rigid base in proper range. Taking flexible stress of base and shear stress of base as designing indices for semi-rigid pavement and compound pavement could constraint the modulus value of semi-rigid base. The introduction of shearing stress is particularly necessary for asphalt pavement design because it can seriously affect material parameters and help optimize both the structure and material design. 9 tabs, 6 figs, 10 refs.%以西安-铜川高速公路改扩建工程为依托,分析半刚性基层沥青路面、复合式基层沥青路面及柔性基层沥青路面的破坏形式,并建立与之相对应的设计指标体系.采用壳牌计算软件Bisar3.0分析材料参数对路面力学响应的敏感性,从路面受力均衡角度验证各类沥青路面设计指标的合理性.结果表明:对柔性路面采取弯拉应变与面层剪应力指标进行双控,可实现基层模量的合理取值;半刚性路面与复合式路面采取基层拉应力与面层剪应力指标进行双控,可对半刚性基层模量起到牵制作用;沥青路面设计增加抗剪指标尤为必要,可对材料参数起到制约作用,实现结构设计与材料设计的双重优化.

  7. 沥青公路路面病害及其养护探讨%Discussion on the Distress and Maintenance of Asphalt Pavement Surface

    Institute of Scientific and Technical Information of China (English)

    许锋雷; 缪定武

    2013-01-01

      近年来由于车辆超载、水毁、养护管理不善的原因,部分沥青路面出现开裂、泛油、剥落、车辙等破损情况,致使公路行驶质量降低,直接影响了车辆的正常运行和公民的生命财产安全。因此,本文结合当前我国沥青公路的现状,分析并探讨对其的养护。%In recent years, due to overloading of vehicles da-maged, be damaged by flood, not good at maintenance manag-ement, part of the asphalt pavement appeared the damages of cracking, bleeding, spal ing, rut ing damage, resulting in redu-ced the quality of road, directly affects the normal operation of vehicle and safety of the lives and property of citizens. Theref-ore, based on the current situation of China's asphalt road, this paper analyzes and discusses its maintenance.

  8. Explore the Damage Problems and Effective Protection Measures of Highway Asphalt Concrete Pavement%探究高速公路沥青混凝土路面破损问题及有效防护措施

    Institute of Scientific and Technical Information of China (English)

    何娅兰

    2014-01-01

    高速公路是我国重要的交通设施,对我国的经济发展具有极大影响。本文列举了高速公路沥青混凝土路面破损的几种类型,并对沥青路面破损的原因和防护措施进行了分析。%Highway is Chinese important traffic facilities, which has a great influence on the economic development of China. This paper enumerates several types of highway asphalt concrete pavement damage and carries on the analysis of the causes and protective measures of the asphalt pavement da-mage.

  9. Application of Cold In-place Recycling Technology with Stabilized Cement to Asphalt Pavement%浅谈沥青路面水泥稳定就地冷再生技术的应用

    Institute of Scientific and Technical Information of China (English)

    周松涛

    2013-01-01

    With the national and provincial trunk highways gradually transforming by the new construction project for the renovation, expansion and overhaul project, the maintenance and utilization program of original asphalt pavement becomes the key issues in the road reconstruction process. This paper introduced the application of cold in-place recycling technology with stabilized cement to the old asphalt pavement treatment with project instance.%  随着国省干线公路由新建工程逐渐转变为改扩建及大修工程,原有沥青路面的维修与利用方案成为道路改建过程中的关键问题,本文结合工程实例介绍了水泥稳定就地冷再生技术在对旧沥青路面进行处理中的应用。

  10. Application of hot in-place recycling technology of asphalt pavements in road construction%沥青路面现场热再生技术在道路施工中的应用

    Institute of Scientific and Technical Information of China (English)

    赵会君

    2011-01-01

    This paper introduced the application of hot in-place recycling technology of asphalt pavements in road construction, specifically elaborated the construction technology and operation points of hot in-place recycling technology of asphalt pavements, analy%介绍了沥青路面现场热再生技术在道路施工过程中的应用,具体阐述了沥青路面现场热再生施工工艺及操作要点,并分析指出了沥青路面现场热再生的技术优势及其社会经济效益,以期促进该技术的大力推广应用。

  11. 土工布在水泥混凝土路面加铺沥青层中的应用%Application of geotextile in cement concrete pavement paving asphalt layer

    Institute of Scientific and Technical Information of China (English)

    王强林

    2011-01-01

    Combining with the application of geotextile in the construction of Gui-Liu highway pavement paving asphalt layer, this paper detailedly elaborated the application of geotextile in cement concrete pavement paving asphalt concrete surface layer, emphatically introduced the materi- al properties and construction technology of geotextile, accumulated valuable experience for future similar projects construction.%结合土工布在桂柳高速公路路面加铺沥青层工程的应用,详细阐述了土工布在水泥混凝土路面加铺沥青混凝土面层中的应用,着重介绍了土工布的材料特性和施工工艺,为今后同类工程施工积累了宝贵经验。

  12. 车辆荷载下沥青路面动力响应随机特性及可靠性分析%Random Characteristics and Reliability Analysis of Asphalt Pavement Under Vehicle Random Load

    Institute of Scientific and Technical Information of China (English)

    刘小云; 史春娟

    2012-01-01

    In order to study the dynamic response of the asphalt pavement under the vehicle random load,the vehicle random vibration model and the dynamic response model of the asphalt pavement were established respectively,in which the asphalt layer and the basic layer were both considered as visco-elastic materials.A new method which combined the Fourier transform with the wavelet method was presented to get the stochastic response analytical solution.According to the actual parameters of the vehicle and asphalt pavement,and the road roughness was treated as the initial excitation,the power spectral density function and the self-correlation function of the vehicle random load were simulated.The random characteristics of dynamic response for the asphalt pavement were analyzed and the main digital characteristic functions were calculated.The reliability design of asphalt pavement was studied.The results show that the average response function has no relation with the degree of pavement,but the power spectral density,self-correlation function and standard deviation will increase as the level of pavement decreases.The dynamic responses of different asphalts in different reliabilities are determined to avoid the unreasonability of using the static load as the design load.The analytical and calculating methods can provide reference for asphalt pavement reliability design.%为了研究车辆随机荷载作用下沥青路面的动力响应,建立了车辆随机振动模型和车辆随机激励下基层-面层双粘弹性沥青路面动力响应模型,并采用Fourier变换与小波变换相结合的新方法求得了路面随机响应解析解。根据实际车辆参数及道路参数,以路面不平度为初始激励,仿真得到了车辆随机荷载的功率谱密度函数和自相关函数,分析了沥青路面在车辆荷载下的随机动力响应特性,计算了沥青路面动力响应的主要数字特征函数,同时还对沥青路面随机动力响应进行了可靠性设

  13. 混合式基层沥青路面结构应力、应变特性及经济性分析%Mechanical 、Economic and Budget Analysis of Asphalt Pavement Structure on Mix Base

    Institute of Scientific and Technical Information of China (English)

    彭红卫; 蒋功雪; 朱沅峰

    2012-01-01

    Based on asphalt pavement design theory and criterions in China, five asphalt structures are put out, including three mix base pavement structures, one typical semi-rigid base pavement structure and one typical flexible base pavement structure. For contract study, different pavement structures were selected with various combinations of modulus and Poisson ratio, but the total thickness is same for comparative analysis. The stress-strain at different depth in asphalt layer is calculated by using BISAR program. The data analysis is carried out for the maximum tensile stress, and the maximum strain of asphalt layer, and the maximum compressive strain on top of sub grade, deflection on asphalt surface. And budget basis price for base is contrasted too. The data analysis results show that the mix base asphalt pavement structures can be designed to get better pavement mechanical performance than typical semi-rigid base and typical flexible base asphalt pavement structures, while the price is higher than semi-rigid base. If thinking over fatigue life, the cost performance for mix base of upper base with asphalt stabilized macadam is the best. This gives out the important reference for widespread the mix base in future.%基于我国沥青路面设计理论及标准,拟定了3种混合式基层、一种典型半刚性基层与一种典型柔性基层共5种沥青路面结构,利用BISAR3.0程序对5种结构进行力学计算分析.主要针对5种路面结构的沥青层内最大拉应力、最大拉应变、路基顶面压应变、路表弯沉等力学指标进行深入对比分析,并根据疲劳寿命对各类基层进行了经济性分析.数据分析结果表明:通过合理的设计,混合式基层结构在力学性能上可以较典型半刚性基层和柔性基层结构更加优秀,虽然从单价上来讲,经济性能上不如半刚性基层,但考虑路面疲劳寿命性价的话,采用沥青稳定碎石作为上基层的混合式基层可以优于半刚性基

  14. 长寿命沥青混凝土路面结构特点与设计分析%Structural characteristics and design analysis of perpetual asphalt concrete pavements

    Institute of Scientific and Technical Information of China (English)

    张耀将

    2016-01-01

    关于长寿面沥青混凝土路面应用与管理的研究应该形成一个完整的体系,只是对这个话题初步进行了分析了。要加强对沥青混凝土的研究,以路面使用时间短、路面损坏现象严重的问题。%There should be a complete system about the application and management research on perpetual asphalt concrete pavements.This paper preliminarily discusses the topic.It points out that we should strengthen the research of perpetual as-phalt concrete,to solve the problem of use shortly -time -using and badly -damaged pavement.

  15. Effect of Reclaimed Asphalt Pavement on the Properties of Asphalt Mixtures%RAP对再生沥青混合料马歇尔指标的影响

    Institute of Scientific and Technical Information of China (English)

    A.Hussain; 邱延峻

    2012-01-01

    An experimental study was presented to eveluate the effect of the types and percentages of RAP on the Marshall performance index of asphalt mixtures.Adopting two different virgin aggregates(Limestone and Quartzite)and two different RAP sources(Nowshera and Mandra),preparing the Hot Mixture Asphalt Marshall specimens respectively,testing the different RAP ratio(0% ~ 100%)and different types of asphalt mixture of air voids,asphalt saturation,voids of mineral aggregate,Marshall stability,flow value,density and other index.The results show that mixtures containing RAP showed high stability and the stability increased with the increase in RAP content.%研究了旧沥青混合料(RAP)的种类及掺量对再生沥青混合料马歇尔指标的影响.以2种新集料(石灰岩和石英岩)及2种旧沥青混合料(Nowshera和Mandra)制备的集料,分别配制成热拌沥青混合料(HMA)的马歇尔试件,测试了不同RAP掺量(0% ~100%)及不同RAP种类的沥青混合料的空隙率、沥青饱和度、矿料间隙率、马歇尔稳定度、流值及密度等指标.试验表明:含有RAP的混合料具有更高的稳定度值,且稳定度随着RAP含量的增加而增大.

  16. 双层多孔隙沥青路面吸音降噪有限元分析%Finite element analysis for noise-reducing of double-layer porous asphalt pavement

    Institute of Scientific and Technical Information of China (English)

    王宏畅; 黄晓明; 廖公云; 薛国强

    2011-01-01

    For single-layer porous asphalt pavement easy blocking, double-layer porous asphalt pavement structure was brought out. The numerical simulation for acoustic absorption properties of porous asphalt pavement structure was made with application of finite element method and acoustic-solid coupling model by large-scale commercial software ABAQUS. The noise-reducing feature was analyzed for the double-layer porous asphalt pave- ment in porosity and thickness combinations and then structural parameters suitable for double-layer porous pave- ment was proposed. The result indicated that double-layer porous asphalt pavement has better sound absorption for upper and lower-layer porosity of 10% , 25% , the upper and lower-layer thickness of 2 cm, 4 cm. The con- clusion can provide a theoretical basis for the application of double-layer porous asphalt pavement.%针对单层多孔隙沥青路面容易阻塞的问题,提出双层多孔隙沥青路面结构形式,采用有限元的方法,应用空气介质和吸声结构的声一固耦合模型,通过大型商用软件ABAQUS对多孔隙沥青路面吸声结构的吸声性能进行数值仿真模拟,分析了双层多孔隙沥青路面中空隙率组合以及厚度组合下的降噪特性,据此提出适宜的双层多孔隙沥青路面结构参数,计算结果表明双层多孔隙沥青路面结构,当上层空隙率为10%,下层空隙率为25%,上层厚度为2cm,下层厚度为4cm时,吸声效果较好。结论可为双层多孔隙沥青路面的应用提供理论基础。

  17. Design and Performance of Hot Mix Asphalts with High Percentages of Reclaimed Asphalt: Approach followed in the Paramix Project

    OpenAIRE

    Pérez, F.; Rodriguez, M; Visscher, J.; Vanelstraete, A.; Bock, L.

    2004-01-01

    The use of reclaimed asphalt pavement (RA) in new asphalt pavements can provide important economical savings, while reducing the negative environmental impact. The European research project PARAMIX aims to improve the techniques for hot mix recycling in plant and cold mix in situ recycling, so as to increase the amount of reclaimed asphalt and develop competitive road pavement rehabilitation techniques. This paper deals with the design of hot mix asphalts for the project. The di...

  18. 广西地区高速公路沥青路面病害及防治措施%Asphalt Pavement Disease of Expressway in Guangxi and Preventive Measure

    Institute of Scientific and Technical Information of China (English)

    胡浩; 马进; 窦健珍

    2012-01-01

    以广西南宁至友谊关、百色至罗村口高速公路为例,调查并分析了广西地区高速公路沥青路面常见病害。介绍了南友高速、百罗高速公路沥青路面目前的养护方法及技术,并对进一步完善广西地区高速公路沥青路面预防性养护工作提出了建议。%Taking Nanning-Youyiguan and Baise-Luocunkou Expressway in Guangxi as an example,common diseases of asphalt pavement of expressway in Guangxi are surveyed and analyzed.The current maintenance methods and technology for asphalt pavement of Nanning-Youyiguan and Baise-Luocunkou Expressway are introduced and proposals of improving preventive maintenance of asphalt pavement of expressway in Guangxi are put forward.

  19. 高等级公路沥青路面预防性养护措施优选研究%Study on preventive maintenance measures of high-grade highway asphalt pavement

    Institute of Scientific and Technical Information of China (English)

    徐俊峰

    2015-01-01

    介绍了高等级公路沥青路面预防性养护技术,阐述了高等级公路由以往的建设为主,发展成为建设与养护并重的新模式,对高等级公路沥青路面预防性养护技术中常见的问题进行了论述,指出只有搞好沥青路面的预防性养护工作,才能有效的延长高等级公路的使用寿命。%The paper introduces preventive maintenance technology of high-grade highway asphalt pavement,describes new mode of combining development construction and maintenance replacing construction orientation,discusses common preventive maintenance technology problems of high-grade highway asphalt pavement,and finally points out that:only through improving preventive maintenance of asphalt pavement,can we ef-fectively prolong high-grade highway service life.

  20. 戈壁荒漠地区沥青路面施工质量控制技术%Construction quality control technology of asphalt pavement in Gobi desert region

    Institute of Scientific and Technical Information of China (English)

    谢强

    2015-01-01

    The typical disease form of asphalt pavement was summarized in the Gobi desert region of Gansu province.Based on the construction management experience in t in the region for many years,construction quality control technology of asphalt pavement in Gobi desert region was developed.The highways tracking survey results show that asphalt pavement quality can be well controlled by some quality control technology in the Gobi desert region of Gansu province i.e.design and construction process optimization, strict material selection.%总结了甘肃省内戈壁荒漠地区沥青路面的典型病害形式,结合在该地区多年的施工管理经验,提出了降低戈壁荒漠地区沥青路面病害的施工控制技术。多条高速公路的跟踪调查结果表明,通过设计优化,施工过程精细化控制,工艺优化,材料严格选择,可以很好的控制河西地区的公路沥青路面质量通病。

  1. 双层排水路面在遂资眉高速公路工程中的应用%Application of Double Drainage Asphalt Pavement in Sui Zimei Highway Engineering

    Institute of Scientific and Technical Information of China (English)

    王毅; 唐国奇; 魏娟; 张姣; 廖飞

    2014-01-01

    Compared with conventional single-layer drainage asphalt pavement structure,double drain-age pavement structure system has great advantages in noise reduction,anti-slide,drainage,antifreeze and durability.Based on the engineering application of double drainage asphalt pavement in Sui Zimei highway engineering,the double-layer drainage asphalt mix design and performance test are investiga-ted in this paper.Finally a detailed introduction of construction technology is presented.%双层排水路面结构体系相对于传统的单层排水沥青路面结构在降噪、抗滑、排水、抗冻及耐久性等方面具有较大的优势。文中通过双层排水降噪沥青路面在遂资眉高速公路工程中的实际应用,对双层排水性沥青混合料的配合比设计及其性能进行了试验测试分析,并就工程施工的要点进行了总结。

  2. Research on Applying Ground Penetration Radar for Asphalt Pavement Thickness Detection%应用地质雷达检测沥青路面厚度的研究

    Institute of Scientific and Technical Information of China (English)

    王东博

    2015-01-01

    Pavement layer thickness detection is an important work on road quality control, non-destructive testing technology is gradually replacing the traditional destructive testing methods. This paper studies the geological radar theory and its use in asphalt pavement thickness testing of physical engineering, pavement thickness of this non-destructive testing technology, and the accuracy, reliability, and error causes are analyzed. The results show that ground penetrating radar detection of the asphalt pavement has a unique advantage in quality.%路面结构层厚度检测是道路质量控制的重要工作,无损检测技术正在逐步取代传统破坏性试验手段。本文通过研究地质雷达的理论和其在沥青路面厚度检测的实体工程中的应用,对这种无损检测路面厚度技术的准确性、可靠性及误差产生原因进行了分析。结果表明地质雷达在沥青路面质量检测中具有独特的优势。

  3. Analysis on the Application of Modified Emulsified Asphalt in Expressway Pavement Construction%改性乳化沥青在高速路面施工中的应用分析

    Institute of Scientific and Technical Information of China (English)

    张佳

    2013-01-01

    This article discusses the technology characteristics of modified emulsified asphalt, carries out the analysis and dis-cussion of the modified emulsified asphalt applied in the exp-ressway pavement construction, and has a deep understanding to the relevant contents, aims at providing some enlightenment and thinking to the application of modified emulsified asphalt.%文章论述了改性乳化沥青的技术特点,并着重就改性乳化沥青在高速路面施工中的应用做出了分析与探讨,对其相关内容有了一个深入的了解,意在为改性乳化沥青的现实应用提供借鉴与思路。

  4. Linear Fatigue Damage Characteristics and Stress Evolution Regularity of Asphalt Pavement%沥青路面线性疲劳损伤特性及应力状态演变规律

    Institute of Scientific and Technical Information of China (English)

    孙志林; 黄晓明

    2012-01-01

    In order to study the fatigue damage characteristics and stress evolution regularity of asphalt pavement under vehicle load, by using general finite element software ABAQUS and the secondary development platform, a numerical model of asphalt pavement considering pavement material linear fatigue damage was established to analyze the spatial distribution and evolution of asphalt pavement structure damage under repeat vehicle loads, and to analyze the horizontal normal stress within the pavement structure. The results show that (1) The pavement structural damage mainly distributes in a specific damage zone located near the bottom of the layer along the middle line between the double wheels. With an increasing of the load cycles, the damage degree at the bottom of the base layer and thft sub-base layer increases, but the rate of which gradually decreases. (2) The horizontal tensile stress in the specific damage zone of a pavement structure considering damage is less than that of the pavement structure without considering damage. Simultaneously, this horizontal tensile stress gradually decreases, and the rate of which also decreases with the increase of load cycles. The results can be used to judge the failure region and degree of the asphalt pavement under maintenance, and to determine the design index of the asphalt pavement design research.%为了研究沥青路面结构在车辆荷栽作用下的疲劳损伤演化特性及应力状态演变规律,运用通用有限元软件ABAQUS及二次开发平台,建立考虑路面材料线性疲劳损伤的沥青路面结构数值计算模型,分析沥青路面结构在车辆荷载反复作用下路面结构损伤以及路面结构内部水平正应力的空间分布与演化规律.结果表明:路面结构损伤主要分布在双轮中心线下靠近层底的区域,随着荷载作用次数增加,基层层底与底基层层底损伤度均增加,但增加幅度逐渐减小;双轮中心线下靠近层底区域,考虑损伤的

  5. Properties of Emulsification and Recycling of Reclaimed Asphalt Pavement in Room Temperature%常温乳化再生回收沥青混合料的性能

    Institute of Scientific and Technical Information of China (English)

    王昌引; 葛折圣; 胡晓倩; 黄明波

    2011-01-01

    In the existing technology of cold asphalt pavement recycling, it is only the aggregate that is used again after the crushing and screening of the Reclaimed Asphalt Pavement ( RAP), but the asphalt is discarded. So a lot of asphalt resource is wasted. The technology of emulsification and recycling of RAP in room temperature reuses the aged asphalt in the RAP thereby effectively reducing the quantity of newly added asphalt and also improving the performance of the mixture. The application of this technology will save a lot of valuable resources, reduce material costs and save project investments. The technology also contributes to the practice of " resource-saving and environmental-friendliness" in road construction.%现有的沥青路面冷再生技术将回收的旧沥青混合料破碎、筛分后作为集料使用.其中的沥青未得到利用,造成了大量沥青资源的浪费.回收沥青混合料的常温乳化再生技术能充分利用回收混合料中的老化沥青,降低新添加沥青的用量,提高混合料的路用性能.该成果的推广应用将节约大量宝贵的沥青资源,降低材料成本,节约工程投资.为实践“资源节约,环境友好”和可持续发展的交通建设模式做出贡献.

  6. 厂拌热再生沥青混合料在含LSPM路面结构中的应用及评价%Application and Evaluation of Asphalt Mixture by Central Plant Hot Recycling in Pavement Structure with LSPM

    Institute of Scientific and Technical Information of China (English)

    薛彦卿; 黄晓明

    2011-01-01

    Firstly, the reclaimed asphalt pavement was detected, and further mixing proportion of as-phalt mixture AC-20/AC-25 by central plant hot recycling was designed. Secondly, the compressive strength and the compressive resilience modulus of the mixture with different RAP percentages were tested with pressure machine and MTS-810 respectively at 15 and 20℃. Next, the change laws were analyzed and the value ranges were recommended. Finally, structural analysis and evaluation were carried out for over-laid asphalt pavement and perpetual pavement by central plant hot recycling with LSPM so as to demon-strate the technical feasibility of the mixture used as structural layer of surface course in pavement struc-ture with LSPM. The studies have suggested that, for overlaid asphalt pavement by central plant hot recy-cling with LSPM, the compressive resilience modulus of the recycled mixture needs testing in design and the tensile stress at the bottom of recycled structural layer needs checking according to specifications. Mo-reover , the application of recycled mixture in perpetual pavement with LSPM can satisfy the design control indexes.%首先对回收沥青路面材料(RAP)进行了检测,进而设计了厂拌热再生沥青混合料AC-20与AC-25的配合比.其次,利用压力机和MTS-810测定了其不同RAP掺配比例下15℃和20℃抗压强度和抗压回弹模量,分析了变化规律并推荐取值范围.最后,针对含LSPM厂拌热再生加铺沥青路面与含LSPM厂拌热再生永久性路面,进行了结构分析与评价,论证了厂拌热再生沥青混合料作为面层结构层应用于含LSPM路面结构在技术上的可行性.研究表明,对于含LSPM厂拌热再生加铺沥青路面,设计时有必要实测厂拌热再生沥青混合料的抗压回弹模量,并验算该结构层底弯拉应力是否满足规范要求;将厂拌热再生沥青混合料应用于含LSPM的永久性路面能满足设计控制指标.

  7. Utilization of Recycled Asphalt Concrete with Warm Mix Asphalt and Cost-Benefit Analysis

    OpenAIRE

    Julide Oner; Burak Sengoz

    2015-01-01

    The asphalt paving industries are faced with two major problems. These two important challenges are generated with an increase in demand for environmentally friendly paving mixtures and the problem of rapidly rising raw materials. Recycling of reclaimed asphalt pavement (RAP) is a critical necessity to save precious aggregates and reduce the use of costly bitumen. Warm Mix Asphalt (WMA) technology provides not only the option of recycling asphalt pavement at a lower temperature than the tempe...

  8. 沥青路面粘层材料性能的试验%Experimental research of tack coat materials' performance on asphalt pavement

    Institute of Scientific and Technical Information of China (English)

    郭寅川; 申爱琴; 张金荣; 孙增智

    2011-01-01

    沥青路面层间材料粘结性能的优劣直接关系到路面的整体受力状态,进而影响路面的使用寿命。利用自行研发的多功能剪切仪,对普通沥青、SBS改性沥青和SBS改性乳化沥青这3种常用的粘层材料在不同温度及洒布量条件下的粘结性能进行试验研究,提出以不同温度下的粘结抗剪强度作为评价指标。结果表明:3种材料的粘结抗剪强度均随着温度的升高而减小,但随温度的变化规律有所不同;相比而言,在较低洒布量时,SBS改性乳化沥青表现出更优异的粘结性能,且最佳洒布量为0.5~0.7kg/m2。%Adhesion performance of the materials between asphalt pavement is directly related to the stress of the asphalt pavement,which affects the road life.The hot bitumen,SBS modified bitumen,SBS modified emulsified bitumen are selected to test the adhesion under different temperatures and the spread quantity.The shear strengthen in different temperatures is considered as the assessment indicator.The results show that the shear strengthen of the three kinds of materials will increase with the temperature down,but the changing laws of the three materials with temperature are different,in low quantity of spreading,the modified emulsified bitumen of SBS is better in adhesion performance,and the best spreading is from 0.5 kg/m2 to 0.7 kg/m2.

  9. Approximate Calculation of Flexural Stresses and Tensile Strains in Asphalt Pavements%沥青路面结构层弯拉应力与应变的近似计算

    Institute of Scientific and Technical Information of China (English)

    吁新华; 谈至明

    2012-01-01

    The flexural stresses and tensile strains in asphalt pavement layers were studied. The hood face coefficient was proposed to characterize the influences of vertical compression stresses and shear stresses on the flexural stresses and tensile strains; the neutral axis moving coefficient was introduced to describe the differences between smooth contact and full friction contact in layers; the flexure torque distribution coefficient was put forward to show the influences of different bend curvature on asphalt layer and base. As to asphalt pavement with nonuniform modulus, the surface equivalent modulus was deduced by bending rigidity equivalent principle, and then the errors of the approximate calculation methods for the tensile strains at the bottom of surface and the flexural stresses at the bottom of base in asphalt pavement whit nonuniform modulus were discussed. Usually, the approximate calculation errors are less than 5%.%研究了各种条件下沥青路面结构弯拉应力和应变规律,引入曲面系数修正竖向压应力和剪应力的影响,引入面层弯曲中性轴下移量参数修正层间光滑与连续之间的差异,引入面层与基层弯矩分配系数反映面层、基层弯曲曲率不同的影响;对于模量不均匀面层,提出了弯曲刚度等效原则换算式;最后,讨论了各种条件下的沥青面层层底弯拉应变、半刚性或刚性基层层底弯拉应力的计算精度,其误差均不超过5%.

  10. Calculation of the temperature of asphalt concrete at making the joints of multilane road pavement of non-rigid type

    Directory of Open Access Journals (Sweden)

    Giyasov Botir Iminzhonovich

    2015-03-01

    Full Text Available The construction quality of road surface of non-rigid type essentially depend on providing the temperature regimes in the process of laying and packing of hot asphalt concrete mixtures. In order to provide the required characteristics of asphalt concrete due to the surface width it is necessary to provide the temperature regimes of hot asphalt concrete mixture in the zones of lane connection. The hot mixture is promptly cooling right after laying within several minutes, which results, according to the construction technology and the specific conditions of work production, in temperature abuse of the mixture at joints of the lanes at packing. The authors present the analysis of the technology of arranging multilane road surface by one paver with the possibility of heating the surface lane edge with the temperature of the adjacent lane. The results of the studies of the production conditions effect on the temperature of edge heating of the previously laid lanes, and the time required to achieve the maximum heating temperature depending on the relative thickness of coating layers.

  11. 积沙沥青路面抗滑性能试验研究%Experimental Study on the Skid Resistance of Asphalt Pavement with Sand Depositing

    Institute of Scientific and Technical Information of China (English)

    王勇; 高丽

    2016-01-01

    基于沙漠公路路面长期积沙的事实,在室内利用自行研制的加速磨耗仪对积沙沥青路面试件进行加速磨耗试验,测定磨耗试件的抗滑性,研究分析路面结构类型、路面积沙程度对积沙路面抗滑性能的影响。试验分析表明,在同一路面工况下,当路面积沙达到1.0kg/m2后,路面抗滑性能快速衰减;路面积沙程度由1 kg/m2增加到1.5 kg/m2后,AC-13的构造深度减少45%,SMA-13的构造深度减少17.6%,SMA-13相比于AC-13具有更强的抗滑性能。研究结果对沙漠公路的设计工作具有较好的参考和借鉴意义。%Based on the fact that the pavement of desert highway has long-term sand depositing ,this research make an accelerated wear tester to test the Specimen of asphalt pavement with sand depositing .The effects of different pavement structure types and degree of sand depositing on the skid resistance were also tested .The results shows that under the same road condition ,when the degree of sand depositing reaches 1 .0 kg/m2 ,the skid resistance reduces rapidly ;while the degree of sand depositing increases from 1 kg/m2 to 1 .5 kg/m2 ,the texture depth of AC-13 reduced by 45% ,the texture depth of SMA-13 reduced by 16 .7% ,the skid resistance of SMA-13 is better than SAC-13 .The research results can provide valuable guidance for the design of highway in desert area .

  12. 广西重载交通下沥青路面结构%Guangxi typical asphalt pavement structure under heavy traffic

    Institute of Scientific and Technical Information of China (English)

    周志刚; 孙绪康; 冯永平; 林有贵

    2012-01-01

    根据广西公路网的具体情况,参考现行规范的要求,结合重载条件下沥青路面结构应力分析,对重载交通的特点以及路面材料参数的取值进行了探讨.建议重载作用下土基回弹模量通过野外承载板法测得的回弹变形0.6mm内的变形线性拟合获得;考虑到重载条件下半刚性材料的p-l曲线表现出明显非线性,建议将半刚性材料的应力应变工作区间延伸到极限荷载的75%~80%.并在工程实践的基础上推荐了几种路面结构组合.%In this paper,considering the specific case of road network in Guangxi,with reference to the current specification requirements,combined with asphalt pavement stress analysis under heavy traffic,the characteristics of heavy traffic and parameters of pavement materials are simply discussed.Reling on a large number of test analysis,soil base resilient modulus values under heavy traffic are proposed by the linear regression method under the test in which the resilient deformation point within 0.6mm by a bearing plate are taken.In addition,considering the case that when unit pressure is greater than 0.7 MPa,p-l curve of the semi-rigid materials shows a clear non-linear relation,and therefore the work stress-strain range are recommended to extend to 75% to 80% of the ultimate load.In the end,based on practical experience,several combinations of pavement structure are recommended.

  13. On the Cold In-place Recycling of Asphalt Concrete Pavement%浅谈沥青混凝土路面现场冷再生技术

    Institute of Scientific and Technical Information of China (English)

    方建明

    2009-01-01

    In the recovery work of Highway Tongeheng-Zhongyang that was damaged after heavy snow, the technique of cold in-place recycling of asphalt concrete pavement to make the new base was applied. Practice indicates that the quality of the new base meet all technical requirement. The article discusses this technique in terms of censtructinn preparation, construction process and test after coastruetinn.%文章介绍桐城至枞阳段雪灾后恢复项目养护工程中冷再生沥青混凝土基层施工,主要从沥青路面现场冷再生施工准备、施工程序、施工后检测的情况,讨论了沥青路面现场冷再生施工技术,实践证明,其冷再生沥青混凝土基层施工质量达到新建基层的各项技术标准.

  14. 透水沥青路面的储水-渗透模型与效能%Water Storage-infiltration Model for Permeable Asphalt Pavement and Its Efficiency

    Institute of Scientific and Technical Information of China (English)

    蒋玮; 沙爱民; 肖晶晶; 裴建中

    2013-01-01

    Rainfall process was numeralized and the physical process of rainwater infiltration was divided into four steps. Pavement materials parameters such as rainwater adsorption rate, permeation rate, air voids content/connected air voids content, pavement thickness and precipitation parameters such as rainstorm return period, rainfall duration were selected for permeable asphalt pavement water storage-infiltration model based on the theory of meteorology and hydraulics, and the target of function design was put forward. Then, the efficiency of water storage and infiltration for permeable asphalt pavement was calculated and analyzed. Results show that the model can predict and evaluate the function of water storage and infiltration for permeable pavement in different regions on different meteorological and rainfall condition. Maximum water storage occurs in the pavement behind the time the rainfall intensity reaches its peak. The water storage structure layer can be thickened or longitudinal drainage pipe can be employed in the pavement structure if the permeable pavement structure can not meet the demand of water storage or infiltration function for some precipitation condition.%将降雨过程数值化并对雨水入渗的物理过程进行划分;选定雨水吸附率、渗透速度、空隙率/连通空隙率、结构层厚度等路面材料参数以及降雨重现期和历时等降雨参数,基于气象学和水力学理论建立透水沥青路面的储水-渗透模型,提出相应的功能设计目标,并对透水路面的效能进行计算和分析.结果表明:所建模型能够针对不同地域的气象和降雨特点对透水路面的储水、渗透功能进行预估和评价;透水沥青路面最大储水量出现时间滞后于最大降雨强度发生时间;当透水路面结构不满足该降雨条件下的储水和渗透功能要求时,可以增大路面储水结构层的厚度,或者在路面结构中铺设纵向排水管道.

  15. 沥青面层结构参数对倒装路面结构非线性响应分析%Analysis of Nonlinear Response of Asphalt Surface Structural Parameters on Inverted Pavement Structure

    Institute of Scientific and Technical Information of China (English)

    胡海学; 肖庆一; 王志辉; 侯子义

    2011-01-01

    级配碎石过渡层能有效防止或减少半刚性基层反射裂缝,改善沥青路面排水条件,但级配碎石模量低,具有非线性应力应变特性,将其作为过渡层置于沥青面层与半刚性基层之间,会改变原路面结构应力状况.通过使用非线性路面设计程序,从沥青面层厚度、模量两个路面结构参数分析路表弯沉值、面层及半刚性基层层底拉应力、土基顶面压应变等控制指标.归纳总结沥青面层厚度以及回弹模量变化对路面各个结构层的拉、压、剪切等力学响应规律,对倒装结构组合设计具有重要的参考价值.%The graded aggregate transition layer can effectively prevent or reduce reflective cracks in the semi-rigid base course and improve the drainage conditions of asphalt road surface, but, graded aggregate has a low modulus and a nonlinear stress-strain behavior. If such graded aggregate is used as a transition layer between the asphalt surface layer and the semi-rigid base, it may change the stress of original pavement structure. By using pavement design software based on the nonlinear theory, surface deflection, tensile stress in underside of surface layer and semi-rigid base course, compressive strain on top of subgrade and other control indicators are analyzed from two structural parameters of thickness and modulus of asphalt surface layer. The law of mechanical response of the variation of thickness and modulus of resilience of asphalt pavement on the tensile, compressive and shear stress in various structural layers of road pavement is analyzed and summarized, providing important reference for the combined design of inverted pavement structures.

  16. Application of hot in-place recycling technology in asphalt pavement maintenance%就地热再生技术在沥青路面养护工程中的应用

    Institute of Scientific and Technical Information of China (English)

    盛燕萍; 李海滨; 孟建党

    2012-01-01

    An hot in-place recycling technology was applied to Xinxiang-Zhengzhou section of Bei-jing-Zhuhai expressway to study the application of the technology in asphalt pavement maintenance. Based on the detection results of old asphalt mixture, the performance degradation of asphalt and ag-gregate in the old asphalt mixture was analyzed. The reasonable mixing amount of recycling agent and fresh asphalt were determined by performance experiments. The gradation of aggregate in old as-phalt mixture was redesigned by adding new aggregate. The practical application results show that performance indexes of hot-in-place recycling of old asphalt mixture meet standard requirements.%为了研究就地热再生技术在沥青路面养护工程中的应用,在新郑高速公路养护工程中采用该技术对沥青路面进行维修.通过对旧沥青混合料进行试验检测,分析旧沥青路面混合料中沥青结合料和集料的性能衰减,并通过不同掺量的性能试验,确定合理的再生剂和新沥青结合料掺量,使沥青性能得到有效再生.通过添加新集料对旧沥青混合料中的集料进行配合比设计,使集料级配得到有效恢复.工程实践表明,旧沥青混合料经过掺加再生剂和新沥青及新集料后形成再生沥青混合料,其各项性能指标均满足规范要求.

  17. 沥青路面弯沉竣工验收双控标准研究%Study on Double-control Criterion for Completion Acceptance of Asphalt Pavement Deflection

    Institute of Scientific and Technical Information of China (English)

    张广; 马庆伟; 郭平

    2015-01-01

    运用数理统计原理,分析不同气候分区下14条高速公路沥青路面在运营初期弯沉现场检测数据,得出不同气候分区下沥青路面运营初期弯沉的衰变幅度;并采用双控指标(即指标的衰变幅度和交工验收标准),建立了弯沉的验收标准。为后续建立关键指标竣工验收标准提供依据,进而指导陕西省乃至全国高速公路沥青路面的竣工验收。%In this paper ,through analyzing initial operational testing data of asphalt pavement deflection of 14 different highways in different climate districts ,the initial operational decay rate of asphalt pavement in dif‐ferent districts is obtained .And by using double-control criterion (decay rate of index and completion accept‐ance criterion) ,the acceptance criterion is established ,which provides the basis for the establishment of com‐pletion acceptance criterion for key indexes ,and offers further directs for completion acceptance of highway as‐phalt pavement in Shanxi and even China ..

  18. Application of CalME incremental-recursive method to the evaluation of the structural condition as asphalt pavements; Aplicacion del metodo recursivo-incremental CalME a la evaluacion del estado estructural de los pavimentos bituminosas

    Energy Technology Data Exchange (ETDEWEB)

    Mateos Moreno, A.; Perez Ayuso, J.; Cadavid Jauregui, B.; Marron Fernandez, J. O.

    2011-07-01

    CalME procedure represents one of the most advanced tools for the design, of flexible pavements world-wide. It is an incremental-recursive method, which means that pavements service life must be divided into many time intervals where both structural integrity and environmental conditions can be regarded as constants. It also means that the damage calculated at the end of each interval must be considered as initial condition for the next one. The goal of this type of models is the prediction of the evolution of the different distress mechanisms. The advantages of incremental-recursive procedures versus classical analytical design are shown in this paper. Advantages are shown not only in terms of design, but also as a tool in order to support structural evaluation. In particular, the potential of asphalt fatigue model incorporated in CalME is presented. this model is initially calibrated in the laboratory, and it is then re-calibrated based on the actual performance observed from field deflection testing. The model provides a reliable prediction of the future evolution of the damage of the asphalt mixture. Fatigue model validation has been conducted based on the performance from several flexible sections evaluated in CEDEX full-scale pavements test track. (Author) 14 refs.

  19. Analysis on Mechanical Influence of Overloading Phenomenon on Asphalt Pavement Structure%超载现象对沥青路面结构力学影响分析

    Institute of Scientific and Technical Information of China (English)

    郑孟贵; 刘圣洁; 陈少全

    2012-01-01

    Based on the current common phenomenon of overloading in Gansu Province, the semi-rigid asphalt pavement structure typical in our country is adopted ; at the same time, against the interlayer contact between the surface and base layers of semi-rigid asphalt pavement structure, its surface deflection, tensile stress on the surface and base layers and compressive strain on the top of the subgrade are calculated and analyzed with bisar3. 0 software for pavement structure. The result shows that different overloading rates have great influence on the mechanical response of semi-rigid base asphalt pavement structure; and the gradually worsen interlayer contact conditions between surface and base layers intensify the damage effect of overloading on pavement. Based on this conclusion, it is recommended that during pavement construction, good interlayer contact conditions shall be guaranteed and some measures adopted to control overloading and heavy loading of vehicle in highway operation.%基于甘肃省目前普遍存在的超载现象,采用我国典型的半刚性沥青路面结构,同时针对沥青路面面层一基层间的层间接触,利用路面结构分析计算软件BISAR3.0对半刚性沥青路面的路表弯沉、面层层底弯拉应力及路基顶压应变进行计算分析。结果表明,不同的超载率对半刚性基层沥青路面结构力学响应有很大影响,而面层一基层间层间接触条件的逐步恶化又加剧了超载对路面的损害效应。基于此结论,建议在路面施工过程中,应保证面层一基层间接触良好,并在道路运营期间采取一些措施控制车辆的超载、重载。

  20. Dynamic Analysis of Asphalt Pavement Constructed on Soft Ground%软土地基上沥青路面在行车荷载作用下的动力分析

    Institute of Scientific and Technical Information of China (English)

    陈页开; 任超

    2010-01-01

    近年来,许多学者对行车荷载作用下柔性路面的动力响应开展了研究,但大部分的研究主要集中在分析柔性路面结构中面层材料和基层材料对路面动力响应的影响,很少有研究考虑到了地基土层,尤其是软土地基对路面结构疲劳和车辙的影响.重点分析了在行车荷载作用下,建造在软土地基上柔性路面的的动力特性,应用ABAQUS中的隐式动力有限元法,充分考虑地基土的弹塑性特性,对车辆单次加载作用下路面结构的特性以及多次加载作用下路面结构的累积变形进行了分析和探讨.%The dynamic response of asphalt pavement under traffic loads,most of the studies are done to analyze the influence of pavement and base material quality on the pavement system, little work has been done to investigate the contribution of the foundation layers on pavement fatigue and rutting under the dynamic load and to reveal the influence of its elastoplastic behavior on the pavement system. The dynamic response of asphalt pavement system under traffic loads on soft ground was investigated. Analyses are done taking into account soil plasticity of subgrade and ground. The analyses focus on the clay subgrade and clay ground rather than on asphalt and base layers. The computed results of one cycle and more cycles are closely studied. The study, conducted with program ABAQUS, employs a axisymmetric, implicit dynamic finite element method.

  1. Combining asphalt-rubber (AR) and fast-pyrolysis bio-oil to create a binder for flexible pavements

    OpenAIRE

    2013-01-01

    Best paper award of the conference The bio-oil from fast pyrolysis is mainly a product of the recycling of waste materials. This is a viscoelastic material, and after a heat treatment it has a viscosity similar to many types of asphalt used in the paving industry. Although bio-oil showed very good high temperature performance, the same was not verified at low temperatures. Therefore, GTR from cryogenic milling was used to modify the bio-oil. Then, a blend was produced by adding 20% (w/w) o...

  2. Simplified Pavement Design for LPAs: Introduction to PaveXpress

    OpenAIRE

    2015-01-01

    Simplified Pavement Design for LPA's; An introduction to and use of PaveXpress, a simplified, free, web-based pavement design scoping tool for roadway and parking lot pavements. The system was developed by Pavia Systems in partnership with the National Asphalt Pavement Association. PaveXpress creates technical sound pavement structural designs for flexible and rigid pavements based on widely accepted industry standards from the Association of State Highway Officials (AASHTO). The simplified p...

  3. The Concrete and Pavement Challenge

    Science.gov (United States)

    Roman, Harry T.

    2012-01-01

    The modern world is characterized by the extensive use of concrete and asphalt pavement. Periodically, these materials are replaced and the old materials disposed of. In this challenge, students will be asked to develop ways to reuse the old materials. It is important for students to understand how concrete and asphalt are made and applied, as…

  4. Mechanism Analysis and Treatment Measures on Water Damage Diseases of Asphalt Pavement%沥青混凝土路面水损病害原因及防治策略

    Institute of Scientific and Technical Information of China (English)

    陈成; 冷鹏

    2014-01-01

    Water damage has become one of the important factors influencing the normal function of asphalt pavement.For the used asphalt pavements,the method of treating water damages is to repair the damages to meet the function and prolong the life.According to the performance of water damage for asphalt pavement,the causes of water damage is analyzed in this paper from three aspects:the di-rect effect of water,the effect of vehicle load and the dynamic water pressure.Based on this,three comprehensive treating ideas and measures of design concepts,construction methods,and material se-lection are proposed.%沥青路面水损害为影响沥青路面正常使用的重要因素之一。对已建成的沥青混凝土路面,水损害处治的重点是对病害缺陷进行修复,以满足使用功能,延长其使用寿命。文中根据沥青路面水损害的现象,从水的直接作用,车辆荷载的作用和动水压力的作用3方面分析了水损害产生的原因。在此基础上,从设计理念,施工方法,材料选用3方面提出了综合治理的方案和对策。

  5. Temperature Characteristic of Asphalt Pavement Structure in Beijing Based on Temperature Survey of Test Road%北京地区沥青路面结构内部温度变化规律

    Institute of Scientific and Technical Information of China (English)

    韩丁丁; 张金喜; 魏建军

    2015-01-01

    为了掌握沥青路面温度变化规律,更加准确地指导沥青路面设计和对沥青路面病害的分析,选择北京地区某高速公路沥青路面,在路面结构内部埋设了温度测试设备,对沥青路面结构内部温度进行了跟踪监测和分析,并给出了北京地区路面结构内部温度极值的预测公式.结果表明:北京地区(实验路段中)沥青路面上面层底部全年最高温度为33.8℃,最低温度为-16.8℃.夏季沥青路面结构内部平均温度梯度为0.45℃/cm,冬季为-0.10℃/cm.路面结构内部温度降温速率在农历夏至前后最大,约0.6~1.2℃/h;路面在冬季长时间处于低温状况,降温速率在冬季较小,约0.2~0.4℃/h.北京地区1 a内沥青路面工作温度处于中低温期的时间约占85%左右.%In order to know the law of the temperature change of asphalt pavements, to design and precisely analyze the damaged asphalt pavements, temperature sensors were buried in a certain highway asphalt pavement in Beijing. And the sensors were used to track and analyze the internal temperature changes of the pavement structure. The results show that the temperature at the bottom of the upper surface varies from 33. 8 ℃ to -16. 8 ℃ during a year. The average temperature gradient of the pavement is 0. 45℃/cm in summer and -0. 10℃/cm in winter. The temperature decreasing rate of the pavement is about 0. 6~1. 2℃/h and the highest temperature decreasing rate occurs around the summer solstice of Chinese lunar calendar. The temperature decreasing rate is smaller than that of other seasons, and the record number is about 0. 2~0. 4℃/h. The working temperature of the asphalt pavement below 20℃ is about 85% within a year. A prediction formula of extreme of the internal temperature of the pavement structure was given in the paper.

  6. Application research on hot in-place recycling technology in Lin-Chang highway asphalt pavement%临长高速公路沥青路面就地热再生应用研究

    Institute of Scientific and Technical Information of China (English)

    汪敏丽

    2014-01-01

    Taking hot in-place recycling engineering of Lin-Chang highway as the background,the paper briefly discusses the construction proce-dures of hot in-place recycling technology,describes asphalt pavement mixture test,asphalt mixing recycling agent test points and recycled mix-ture construction mixing proportion design,and finally summarizes construction quality control measures.%以临长高速公路就地热再生工程为依托,简述了就地热再生技术的施工流程,阐述了原沥青路面混合料试验、沥青掺加再生剂试验要点,并通过再生混合料施工配合比设计,总结了施工过程中的质量控制措施。

  7. Difference of Anti-rutting Performance of Flexible and Semi-rigid Basecourse Asphalt Pavement%柔性与半刚性基层沥青路面抗车辙性能的差异

    Institute of Scientific and Technical Information of China (English)

    王大伟

    2012-01-01

    Semi-rigid basecourse asphalt pavement is commonly applied in domestic expressway and flexible basecourse pavement is more applied in foreign expressway.The difference of anti-rutting performance of these two pavement structures is the issue we need to pay attention to.Through the response of standard load on pavement structure,mechanic analysis on some aspects like stress,strain and bending and etc is performed by using BISAR3.0 software.%国内高速公路普遍使用半刚性基层沥青路面,而国外更多地使用柔性基层路面,这两种结构的路面抗车辙性能的差异是值得我们关注的问题。通过标准荷载对路面结构的响应,使用BISAR3.0软件分别从应力、应变、弯沉等方面进行了力学分析。

  8. Test on Dynamic Response of Flexible Base Asphalt Pavement%柔性基层沥青路面动力响应试槽试验

    Institute of Scientific and Technical Information of China (English)

    李起伟; 黎晓; 梁乃兴

    2012-01-01

    根据室内试槽柔性基层沥青路面结构的重复加载试验,总结了路用电阻应变片的选择依据和黏贴工艺,对比分析了压路机压实方式对应变片存活率的影响;利用惠斯登电桥电路测试了柔性基层沥青路面的动力响应,并与数值计算进行对比.研究表明:路用电阻应变片栅长应大于80 mm,并与集料的最大公称粒径相关;电阻应变片在压路机静压的方式下有较理想的存活率,而在强振作用下却极难存活;在移动荷载作用下沥青面层底部横向应变交替出现拉、压应变,其最大值比层状弹性体系模型计算值小.%According to repeated load test of flexible base asphalt pavement, the structure is built in the indoor pit. The principle of choosing resistance strain gauges and the surface-sticking process of gauge was summarized; the survival rate of strain gauge based on the comparison of road roller' s compaction mode strong vibration or static pressure was discussed. The data of time-history curves was collected through the Wheatstone Bridge with the numerical calculation comparative study. The detection results show; the gate length of resistance strain gauge should not be less than 80mm, which is related to nominal maximum size of aggregate. Gauges' survival rate is affected by different compaction model, which is much lower under the strong vibration model. Also the response of. strain in layer bottom under the dynamic load of moving vehicle is more complex than that in static situation. However, the current pavement structure design method needs transforming from static model to dynamic load model.

  9. Thermal Stresses of Asphalt Pavement with Material Property Dependent on Temperature%考虑材料特性随温度变化时沥青路面的温度应力

    Institute of Scientific and Technical Information of China (English)

    耿立涛; 钟阳; 乔娜

    2009-01-01

    把沥青路面视为层状弹性体系,并将材料特性作为随温度变化的参数,推导了沥青路面温度应力问题的理论解.首先,利用热弹性理论来描述层状弹性体系的温度应力问题,同时考虑了材料特性的随温度变化.其次,通过对热弹性力学的平衡方程进行Laplace和Hankel积分变换得到了单一层问题的解,再利用传递矩阵法得到了多层弹性体系温度应力问题的理论解.最后,将该理论解用于沥青路面温度应力问题的计算,并与材料特性取常数的情况进行了对比.结果表明随温度变化的材料特性对沥青路面的温度应力有显著的影响.%Regarded asphalt pavement as a multilayer elastic system and material property as the parameter changing with temperature respectively, the analytical solutions for thermal stresses of asphalt pavement were derived.First, thermo-elastic theory was used to describe thermal stresses of multi-layered elastic system, while the temperature-dependent material property was considered.Then, the solution for single layer was obtained by using Laplace transformation and Hankel transformation respectively by using thermo-elastic equations of equilibrium.In addition, the transfer matrix method was applied to derive the theoretical solution of thermal stress for multilayer elastic system.Finally, the theoretical solution was applied to calculate thermal stresses in asphalt pavement, and the thermal stress was compared with the case that the material property is supposed to be constant.The result shows the remarkable impact of temperature-dependent material property on thermal stresses of asphalt pavement.

  10. Impact of interlayer condition on mechanical response of asphalt pavement%层间接触条件对沥青路面力学响应的影响

    Institute of Scientific and Technical Information of China (English)

    张艳红; 王晓帆

    2012-01-01

    中国现行沥青路面设计以路表弯沉、沥青层底及半刚性层底拉应力为设计指标,层间条件假定完全连续。实践中路面分层修筑,层间不完全连续,对路面结构受力状态影响甚大。以京津塘高速公路改扩建工程为依托,假定层间完全连续与层间不完全连续2种状态,以壳牌计算软件Bisar 3.0和数值软件Matlab 7.0分析了3类常见沥青路面在2种层间接触条件下的三维力学响应分布及最不利受荷点。结果表明:层间结合不连续导致结构内应力、应变骤增;各类路面在不同层间状态下出现最大应力及应变的位置不同;2种层间条件下复合式路面的响应均居于柔性与半刚性路面之间;路面结构设计时,应在现行规范的基础上,对层间不完全连续状态下指定点位处的力学指标进行验算,为路面在运营期内的可靠度分析提供依据。%The current asphalt pavement designing standards in China adopt deflection on the surface of road,flexural stress on the bottom of asphalt layer and flexural stress on the bottom of semi-rigid layer as the main designing indexes with the interlayer binding condition assumed to be totally continuous.Actually,the pavement structural layers are built respectively and the interlayer condition is incompletely continuous,which affects the mechanical response of pavement structure greatly.With Beijing-Tianjing-Tangshan expressway upgrading project as an example and two types of interlayer conditions considered,Bisar3.0 under shell design system and numerical software Matlab 7.0 were used to describe the 3-D mechanical responses and determine the maximum stress point on three kinds of common asphalt pavement.The results show that stress and strain of the structure greatly increase under discontinuous interlayer condition.The sites of maximum stress and strain are different under the two types of interlayer condition of the three kinds of pavement.The mechanical

  11. Structural and Thermal Analysis of Asphalt Solar Collector Using Finite Element Method

    OpenAIRE

    Jinshah Basheer Sheeba; Ajith Krishnan Rohini

    2014-01-01

    The collection of solar energy using asphalt pavements has got a wide importance in the present energy scenario. Asphalt pavements subjected to solar radiation can reach temperature up to 70°C because of their excellent heat absorbing property. Many working parameters, such as pipe diameter, pipe spacing, pipe depth, pipe arrangement, and flow rate, influence the performance of asphalt solar collector. Existing literature on thermal energy extraction from asphalt pavements is based on the sma...

  12. Introduction to Preventive Maintenance of Asphalt Pavement%浅谈沥青路面预防性养护

    Institute of Scientific and Technical Information of China (English)

    王磊

    2014-01-01

    With the rapid development of social economy, ur-ban traf ic brings more and more high requirement of muni-cipal road use performance. Therefore, road maintenance is a key link in the process of protection of the road normal use. In recent years, the road’s preventive maintenance has become a key road maintenance work. The importance of preventive maintenance is mainly introduced in this paper, and it puts forward the common technical measures of pavement main-tenance. The paper offers a reference to reader.%随着社会经济的快速发展,城市交通对市政道路使用性能的要求也越来越高。因此,道路养护是保障道路正常使用的关键环节。近几年,道路预养护已成为道路养护工作的关键。本文主要介绍了道路预防性养护的重要性,并提出了常用路面预养护的技术措施,以供读者参考。

  13. Environmental performance and mechanical analysis of concrete containing recycled asphalt pavement (RAP) and waste precast concrete as aggregate.

    Science.gov (United States)

    Erdem, Savaş; Blankson, Marva Angela

    2014-01-15

    The overall objective of this research project was to investigate the feasibility of incorporating 100% recycled aggregates, either waste precast concrete or waste asphalt planning, as replacements for virgin aggregates in structural concrete and to determine the mechanical and environmental performance of concrete containing these aggregates. Four different types of concrete mixtures were designed with the same total water cement ratio (w/c=0.74) either by using natural aggregate as reference or by totally replacing the natural aggregate with recycled material. Ground granulated blast furnace slag (GGBS) was used as a mineral addition (35%) in all mixtures. The test results showed that it is possible to obtain satisfactory performance for strength characteristics of concrete containing recycled aggregates, if these aggregates are sourced from old precast concrete. However, from the perspective of the mechanical properties, the test results indicated that concrete with RAP aggregate cannot be used for structural applications. In terms of leaching, the results also showed that the environmental behaviour of the recycled aggregate concrete is similar to that of the natural aggregate concrete.

  14. Dynamic Response Characteristics of Asphalt Pavement Under Multi-axle Moving Load%多轴移动荷载下沥青路面的动态响应特性

    Institute of Scientific and Technical Information of China (English)

    裴建中; 吴浩; 陈勇; 王秉纲

    2011-01-01

    In order to analyze dynamic response characteristics of asphalt pavement under muhi axle moving load,a three-dimensional finite element model of asphalt pavement was established by field investigation. The influences of axle load with uniform distribution of single rear axle, dual rear axles and three rear axles and the axle load with non-uniform distribution of three rear axles and the three rear axles vehicles with impending front axle on pavement were studied respectively. Results show that the effect of each axle on pavement is independent when the wheelbase of multi axle vehicle is bigger than 3 m. Increase of number of axle makes the vertical displacement of pavement superpose and makes the maximal shear stress and compressive stress of pavement change inconspicuously. The influence of the middle axle of three rear axles vehicle on the vertical displacement of pavement is the greatest which increases by 23. 7% and 18. 2% compared with those of the front axle and rear axle respectively. Besides, the middle axle and rear axle has certain influence on the shear stress of pavement, but each axle has ahnost no influence on the maximal compressive stress of pavement. The research results indicate that the non uniform distribution of axle load of multi axle vehicle has significant influence on pavement faliure.%为分析多轴移动荷载下沥青路面的动态响应特性,通过现场调查建立了不同轴型作用下沥青路面的三维有限元模型,分别研究了单后轴、双后轴及三后轴轴载均匀分布、三后轴车轴载不均匀分布及三后轴车前轴悬空条件下对路面的影响。结果表明:多轴车轴距大于3m时,各轴对路面的作用相互独立,轴数的增加对路面竖向位移产生叠加作用,对路表最大剪应力及压应力影响不明显;三后轴车中轴对路面竖向位移作用最大,较前轴及后轴分别增大23.7%和18.2%,中轴及后轴对路表剪应力有一定影响,

  15. 磷渣微粉基隧道沥青路面阻燃剂的制备及其性能试验%Preparation and performance test phosphorus slag powder base tunnel asphalt pavement retardants

    Institute of Scientific and Technical Information of China (English)

    钱国平; 王坤; 郑卫芳

    2016-01-01

    针对隧道沥青路面防火安全问题,配制了6种磷渣微粉基材阻燃剂 A~F。通过 DSC 试验评价了各阻燃剂阻燃性能,选出了最优阻燃剂;对掺入不同掺量的阻燃改性沥青进行路用性能试验和极限氧指数试验,分析了阻燃剂最佳掺量和阻燃效果;采用锥形热试验对阻燃沥青混合料进行阻燃性能研究。试验结果表明,阻燃剂 D,F 有明显的两个吸热峰;阻燃剂 D 和 F 的加入使沥青的氧指数得到显著的提高;不同掺量阻燃剂 D,F 的加入,能够满足沥青路用性能的要求,阻燃剂的最佳掺量为8%;与非阻燃改性沥青混合料相比,阻燃改性沥青的引燃时间变长,热释放速率减缓,总释热量全过程低于非阻燃沥青混合料。阻燃剂 D,F 的加入对沥青及沥青混合料的阻燃效果明显,且阻燃剂 D 阻燃效果最优。%Six kinds of phosphorus slag powder-based flame retardants were prepared in or-der to solve fire-proof safety problem of tunnel asphalt pavement A-F.The combustion prop-erties of flame retardants were evaluated by DSC experiment and the optimal flame retard-ants were selected.The pavement performance and limiting oxygen index of flame-retardant modified asphalt with different amounts of retardants were tested,then the optimum a-mount of flame retardants and flame retardancy were analyzed.The Cone thermal test was conducted to study the flame retardant properties of flame retardant asphalt mixture.the re-sults show that flame D,F two endothermic peaks are obvious.With the addition of flame retardant D and F,the oxygen index of asphalt was significantly improved.Different dosage of the addition of flame retardant D,F can meet the requirements of the pavement perform-ance.The optimum amount of flame retardant is 8%.Compared with the nonflame-retardant asphalt mixture,the retardancy of flame-retardant modified asphalt mixture is better:its ig-nition time is longer,heat release rate is slower and the

  16. Mechanical properties of full-depth cold regenerated base mixture from old asphalt pavement%旧沥青路面全深式冷再生基层材料力学性能

    Institute of Scientific and Technical Information of China (English)

    吴文飞; 何锐; 陈华鑫; 武书华

    2016-01-01

    为研究应用旧沥青路面材料冷再生基层的混合料力学性能,回收原沥青路面面层旧料和基层旧料,制备沥青路面全深式冷再生基层材料,结合现场沥青面层及铣刨深度测试冷再生材料级配,测试冷再生基层材料的7 d无侧限抗压强度、90 d劈裂强度和90 d回弹模量,并观察其SEM微观形貌图。结果表明:水泥用量较少时7 d无侧限抗压强度、90 d劈裂强度和90 d回弹模量均随水泥剂量的增加快速增长,但是增长趋势逐渐变缓;较少的沥青旧料对再生基层力学性能是有利的,但是过多的沥青旧料则会产生较大的负面影响;当面层旧料的油石比较小时,水泥水化物取向结晶能刺破沥青膜层,直接与裹附在沥青内部的集料接触,形成较强的界面,这样能有效缓解沥青对强度的负面影响。进而建议低等级公路的中、轻型交通等级水泥剂量在5%~7%,其他类型公路则在提高水泥剂量的同时需要改善旧料级配;油石比小的旧沥青路面改造更适合推行全深式冷再生基层技术。%In order to analyze the mechanical properties of cold regenerated base mixture from old asphalt pavement, the old material of original asphalt pavement and base was recycled to prepare the full depth base mixture. Combined with on-site asphalt surface layer and milling depth, the grada-tion of cold regenerated base mixture was analyzed. The 7 d unconfined compressive strength, 90 d splitting strength and 90 d modulus of resilience of the mixture were tested, and the SEM morphology of the mixture was observed. The results show that, when less amount of cement content was used, the 7 d unconfined compressive strength, 90 d splitting strength and 90 d resilient modulus of the mixture increase rapidly with the growth of the cement dosage, while the growth is becoming slowly;that it would benefit the mechanical properties of reclaimed base if a small quantity

  17. 沥青混凝土路面就地热再生施工工艺探讨%Discussion on Construction Process of Hot In -Place Recycling Technology of Asphalt Concrete Pavement

    Institute of Scientific and Technical Information of China (English)

    徐安花; 房建宏

    2015-01-01

    Hot in-place recycling technology of asphalt concrete pavement ,w hich has broad application prospects ,has significant economic and technical advantages in waste utilization ,resource saving ,ecological environmental protecting ,etc .In this paper ,in order to provide guidance to site construction of hot in -place recycling technology ,the essential points and attentions of the construction process of hot in -place recycling technology of asphalt concrete pavement are analyzed from its technological type ,heating method ,scarifying method ,adding mode of additive and construction process .%沥青混凝土路面就地热再生技术在废料利用、资源节约和生态环境保护等方面具有显著的技术和经济优势,具有广阔的应用前景。本文从沥青混凝土路面就地热再生主要工艺类型、加热方式、翻松方式、再生剂添加方式及施工过程等方面分析了沥青路面就地热再生技术施工工艺方面的要点及注意事项,以期为就地热再生技术的现场施工提供指导。

  18. 高速公路沥青路面基层冷再生技术研究%Research on the Cold Recycling Technology of Asphalt Pavement of Highway

    Institute of Scientific and Technical Information of China (English)

    解朝森; 周杰

    2014-01-01

    本文以冷再生技术在高速公路沥青路面中的技术优势为切入点,简单介绍了其冷再生混合料的强度机理,重点对冷再生技术的稳定剂选择优缺点进行了分析,最后简介了一般高速公路沥青路面基层冷再生技术的施工步骤。%This paper took the advantages of the cold regene-ration technology in the asphalt pavement of highway as the breakthrough point, introducing the strength mechanism of co-ld recycling mixture and analyzing the disadvantages and adv-antages of the stabilizers selection of the cold regeneration technology, Final y, the author introduced the construction pr-ocedure of cold recycling technology in the general asphalt pavement of expressway.

  19. 单双圆荷载作用下沥青路面受力特性对比研究%Comparative Study of Asphalt Pavement Force Under Single and Double-round Loads

    Institute of Scientific and Technical Information of China (English)

    郑元勋; 蔡迎春; 张亚敏

    2012-01-01

    To study the similarities and differences of force and deformation of asphalt pavement under single round and two round loads, and to verify the effectiveness of using single round uniformly distributed load equivalent two-round uniformly distributed load. Firstly, the deflection and stress of asphalt pavement under two-round uniform distributed load were studied, and then the comparative stress analysis of asphalt pavement under single round and two round loads based on elastic layer theory and numerical simulation study by dynamic loading of double-and single-round were carried out. The results show that: both in the static and dynamic load mode, except some differences existing in the road surface, with the increase in the depth of the pavement structure, deflection and stress trends and size are consistent for single round and two round loads, which means that with a single round uniformly distributed load equivalent to two-round to design and testing is feasible and effective.%为研究沥青路面在单圆和双圆荷载作用下的受力及变形的异同,验证用单元均布荷载等效双圆均布荷载的有效性.首先分析了双圆均布荷载下沥青路面弯沉及受力性能变化情况,然后分别进行了弹性层状理论下单圆和双圆作用下沥青路面受力性能对比研究及单圆和双圆动力加载作用下沥青路面力学性能对比数值模拟研究.结果表明:在动、静加载模式下,沥青路面在单、双圆均布荷载作用下的弯沉及应力除在路表处存在一定的差异外,随路面结构深度的增加,弯沉及应力变化趋势和大小均趋于一致,表明用单圆均布荷载等效双圆均布荷载进行设计及相关检测是可行有效的.

  20. VISCOELASTIC STRUCTURAL MODEL OF ASPHALT CONCRETE

    Directory of Open Access Journals (Sweden)

    V. Bogomolov

    2016-06-01

    Full Text Available The viscoelastic rheological model of asphalt concrete based on the generalized Kelvin model is offered. The mathematical model of asphalt concrete viscoelastic behavior that can be used for calculation of asphalt concrete upper layers of non-rigid pavements for strength and rutting has been developed. It has been proved that the structural model of Burgers does not fully meet all the requirements of the asphalt-concrete.

  1. Analysis on Dynamic Response of Saturated Asphalt Pavement under Moving Vehicle Loads by 3D Finite Element Method%移动荷载作用下饱和沥青路面动力响应三维有限元分析

    Institute of Scientific and Technical Information of China (English)

    任瑞波; 祁文洋; 李美玲

    2011-01-01

    Asphalt pavement is a kind of porous medium which consists of solid, liquid and gas phases under the action of outside environment. The coupled hydro-mechanical action leads to the initial failure of asphalt pavement. To explore the dynamic response of asphalt pavement subjected to moving vehicle loads is the premise for understanding the structure behavior of asphalt pavement. First, regarding asphalt mixture as a media consists of solid and liquid phases in level one reasonable approximation, based on the porous media theory, a 3D finite element model of typical semi-rigid base asphalt concrete pavement under moving load was developed in the assumption that the asphalt pavement is saturated. Then, the variation of 3D strain and stress as well as 3D distribution of vertical stress of pavement under saturated condition and dry condition were comparatively analysed. The result indicates that (1) the characteristics of dynamic response of asphalt pavement with moving load under saturated condition and dry condition in surface course are different; (2) it' is more likely to have structure damage such as fatigue cracking and permanent deformation when asphalt pavement is under saturated condition; (3) in asphalt pavement design, it is more reasonable to use flexural-tensile strain as the index than flexural-tensile stress.%沥青路面结构在外界环境作用下是气、液、固三相介质体,水和荷载的耦合作用导致了沥青路面初期损坏的产生,探究其在车辆移动荷栽作用下的动力响应是获知沥青路面结构行为的前提.首先,在沥青路面饱和情况下,作一级合理近似,将其视为流固两相介质.基于多孔介质理论,对于典型半刚性基层沥青路面结构建立了移动荷载作用下的三维有限元模型;而后对比分析了移动荷载作用下,饱和沥青路面和无水沥青路面三向应力、应变响应的时程变化规律以及竖向应力场的三维分布情况.结果表明:移动荷载

  2. 关于沥青混凝土道面公路飞机跑道结构设计方法的分析与研究%Analysis and Research on Structure Design Method of Asphalt Concrete Pavement Airfield Runway on Highway

    Institute of Scientific and Technical Information of China (English)

    曲旭光; 王建宇

    2014-01-01

    This paper put forward a structural design method of asphalt concrete airport pavement about the airfield runway on highway,by study the structural design method of asphalt concrete pavement about the airfield runway,including structure design theories foundation,design indexes,control standard, mechanical response of the pavement and the design steps and flow-chart etc.%从公路飞机跑道沥青混凝土道面结构设计的理论基础、设计指标、控制标准、道面结构力学响应分析、设计流程及步骤等方面进行分析研究,提出了公路飞机跑道沥青混凝土道面结构设计方法。

  3. Estudo de misturas asfálticas com ligante modificado pelo polímero EVA para pavimentos urbanos de Manaus - AM Study of asphalt mixtures containing a binder modified with EVA polymer for use in urban pavements in Manaus

    Directory of Open Access Journals (Sweden)

    Daniela M. G. D'Antona

    2011-01-01

    Full Text Available A presente pesquisa buscou soluções com materiais alternativos visando à construção de pavimentos urbanos para Manaus (AM com maior vida útil e condizente com as suas condições de serviço, em particular, o seu desempenho mecânico frente às temperaturas regionais. Estudou-se o ligante regional, CAP 50/70, misturado com 4% do polímero EVA, e como partícipe em compósitos asfálticos. A incorporação do mencionado polímero teve como objetivo melhorar suas propriedades reológicas e, por conseguinte, o comportamento mecânico desse compósito - concreto asfáltico, empregado como revestimento nas vias urbanas da Capital do Estado do Amazonas. Os ligantes (virgem e modificado foram caracterizados conforme a especificação da ANP e a metodologia Superpave. As misturas asfálticas foram avaliadas pelo ensaio de fluência por compressão axial, com carregamento dinâmico à temperatura de 40 ºC. O material asfáltico modificado com EVA (AMP EVA demonstrou melhores propriedades reológicas ou equivalentes ao asfalto convencional (REMAN, ao longo de todos os ensaios de caracterização. As misturas alternativas compostas com o CAP modificado (SEVA obtiveram desempenho mecânico superior ao de misturas com cimento asfáltico habitualmente comercializado na região (SMAN.In this research we investigated alternative materials to build urban pavements in Manaus, seeking for pavements with longer lifetime for usage and suitable mechanical properties to withstand the local temperatures. The asphaltic mixtures contained a regional binder, namely CAP 50/70, mixed with 4% of EVA polymer. The incorporation of the latter polymer was aimed at improving the rheological properties of asphaltic concrete used in roads in the Amazonas' capital. The asphalt binders (original and modified were characterized in accordance with the ANP (National Petroleum Agency specification and the Superpave methodology. The asphalt mixtures had their mechanical properties

  4. 纵坡弯道桥面沥青铺装结构剪应力分析%Shear Stress Analysis of Bridge Deck Asphalt Pavement for Longitudinal Slope Curve

    Institute of Scientific and Technical Information of China (English)

    祁文洋; 孔晨光; 于增义

    2014-01-01

    依据纵坡弯道车辆荷载作用特性,建立纵坡弯道桥面铺装结构三维有限元模型,分析车辆载重、行驶速度、弯道半径、纵坡坡度、沥青铺装层厚度与模量对水平剪应力的影响。结果表明:设计时避免最小半径极限值与纵坡坡度最大值同时出现,适当增大沥青铺装上层模量、铺装层总厚度、减小沥青铺装下层模量,并严格控制纵坡弯道上车速及车辆载重,可减少沥青铺装层发生推移病害的可能性。%Based on the properties of vehicle loads on longitudinal slope and curved sections, this paper establish-es the 3D finite element model for the bridge deck pavement, analyzing effects of the vehicle loads, running speed, the radius of curved sections, longitudinal slope degree, the thickness and modulus of asphalt layer on horizontal shear stress. Results show that in order to avoid the appearance of the minimum radius and the maximum longitudi-nal slope degree at the same time, it is advisable to increase modulus of upper asphalt layer and the total thickness of asphalt layer, decrease sub-layer modulus, and limit the vehicle speed and load at the curved sections so that translation diseases of asphalt layer can be reduced.

  5. Research on Rutting Resistance of Asphalt Pavement Structure%沥青路面结构抗车辙的研究

    Institute of Scientific and Technical Information of China (English)

    高立波

    2011-01-01

    结合对某高速公路路面车擞近十年的跟踪检测和试验,从新的角度认识路面结构因素对路面车辙的影响,提出了路面结构组合设计原则和联结层设计理念及结构抗车辙措施。%Combined with the almost ten years of tracing inspection and test about an expressway pavement rutting, the influence of pavement structure on pavement rutting is recognized from a new angle. The design principle of pavement structure of pavement combination, design concept of binder course and rutting resistance measures are proposed.

  6. WILLIAMS ELEMENT FOR REFLECTIVE CRACK PROPAGATION IN ASPHALT PAVEMENT ON SEMI-RIGID BASE COURSE%半刚性基层沥青路面反射裂缝扩展过程分析的Williams单元

    Institute of Scientific and Technical Information of China (English)

    徐华; 杨绿峰; 佘振平

    2013-01-01

    This paper presented a Williams element with generalized degrees of freedom (GDOFs) for stress intensity factor (SIF) analysis of reflective crack in asphalt pavement on semi-rigid base course by means of the layered linear elastic plane strain model and isoparametric element.The stiffness equation was developed for Williams element with GDOFs to yield directly the SIF at the reflective crack tip in the asphalt pavement,as the Williams element contains parameters related to the SIF.The SIF variation is investigated during the propagation of reflective cracking under symmetrical and partial load respectively.The influence of the material and geometrical parameters on the SIF was discussed in details.Numerical example shows that the Williams element has the advantage of simplicity as well as high accuracy.Results from the Williams element agree well with those by the traditional quarter-point element,therefore Williams element can be used for SIF evaluation at the reflective crack tip in the asphalt pavement on the semi-rigid base course.%该文对半刚性基层沥青路面结构采用弹性层状体系平面应变分析模型,利用改进的Williams级数,结合广义参数有限元法和常规等参元,建立了反射裂缝裂尖应力强度因子分析的广义参数Williams单元,并推导了Williams单元的刚度方程,据此研究了正对称荷载和偏载分别作用时,反射裂缝扩展过程中应力强度因子的变化规律;重点分析了偏载作用下路面结构层参数与应力强度因子之间的关系.Williams单元中含有与应力强度因子相关的参数,可以直接获得裂尖应力强度因子.算例分析表明:Williams单元与传统方法的计算结果吻合较好,且格式简单,计算精度高,适用于沥青路面反射裂缝扩展过程分析.

  7. Development of asphalts and pavements using recycled tire rubber. Phase 1, Technical feasibility. Technical progress report, September 1, 1994--August 31, 1995

    Energy Technology Data Exchange (ETDEWEB)

    Bullin, J.A.; Davison, R.R.; Glover, C.J. [and others

    1996-06-01

    About 285 million tires are discarded every year; less than 100 million are currently being recycled, with the rest being placed in landfills and other waste sites. A solution to reduce the littering of the environment is to use ground tire rubber in road construction. Currently, about 27 million tons of asphalt are used each year in road construction and maintenance of the country`s 2 million miles of roads. If all of the waste tire rubber could be combined with asphalt in road construction, it would displace less than 6% of the total asphalt used each year, yet could save about 60 trillion Btus annually. Purpose of this project is to provide data needed to optimize the performance of rubber-asphalt concretes. The first phase is to develop asphalts and recycling agents tailored for compatibility with ground tire rubber. Chapter 2 presents results on Laboratory Testing and Evaluation: fractionate asphalt material, reblending for aromatic asphalts, verifying optimal curing parameters, aging of blends, and measuring ductilities of asphalt-rubber binders. Chapter 3 focuses on Evaluating Mixture Characteristics (modified binders). Chapter 4 covers Adhesion Test Development (water susceptibility is also covered). The final chapter focuses on the Performance/Economic Update and Commercialization Plan.

  8. 布敦岩沥青复合改性SMA-13混合料设计及性能%Mixture design and pavement performance for BRA compound modified asphalt mixture SMA-13

    Institute of Scientific and Technical Information of China (English)

    2016-01-01

    In order to improve the high-temperature anti-deformation capacity of SMA pavement,the Buton rock asphalt (BRA)is used as the modifier to conduct the experi-mental research on the mixture design and pavement performance of compound modified stone mastic asphalt mixture SMA-13 of BRA and SBS modified asphalt (abbrevd BSS-MA-13)with five kinds of BRA mixing amount.According to the contents of pure nat-ural asphalt and mineral in the BRA as well as the material composition of asphalt mix-ture,the calculation method of mixture ratio of BRA modified asphalt mixture is put forward to provide an analysis basis for its mixture design.The mixture design results show that the BRA can be replaced by a part of SBS modified asphalt,fine aggregate and mineral powder,but the pure natural asphalt in BRA should not be applied for e-quivalent replacement of SBS modified asphalt.The total optimum oil-stone ratio of BSSMA-13 increases slightly with the increase of BRA mixing amount,and it increases about 0.1%~0.3% in the range of BRA mixing amount 2%~5%.The pavement per-formance tests show that the incorporation of BRA can effectively improve the high-temperature stability,water stability,flexural tensile strength and bond behavior of BSSMA-13 with the favorable performances of anti-permeability and skid resistance, but it has a certain influence on the low-temperature anti-deformation capacity.Hereby, the suitable mixing amount of BRA is obtained as 3%~4%.Therefore,BRA is a kind of modifier with excellent performance,and its modified SMA-13 is suitable for the as-phalt pavement of heavy traffic road in the special road sections including bridge deck, tunnel,large longitudinal slope and bend,etc.,in southern China's rainy region.%为了提高SMA路面的高温抗变形能力,以布敦岩沥青(BRA)作为改性剂,对5种BRA掺量的BRA与SBS改性沥青复合改性沥青玛蹄脂碎石混合料SMA-13(简记为BSSMA-13)的配合比设计和路用性能进行了试验研究.根据BRA

  9. Theoretical Development and Engineering Practice of Pavements in China

    Institute of Scientific and Technical Information of China (English)

    QIU Yan-jun

    2008-01-01

    This paper presents a comprehensive review of historical theory development and current construction practice of pavement engineering in China. Mechanical models, design guides, construction techniques, evaluation methods and maintenance standards are elaborated for Portland cement concrete (PCC) pavements and asphalt concrete (AC) pavements. Differences in design methodology among pavements of rural highways, urban roads and airport fields are discussed based on service requirements.Lessons and experiences based on the past 20 years' construction practice and pavement performance are summarized. Current research areas in pavement engineering associated with unconventional geological and/or landscaping in China's highway construction and national strategic plan for pavement engineering are also covered.

  10. Porous pavement. Phase 1: Design and operational criteria

    Science.gov (United States)

    Diniz, E. V.

    1980-08-01

    Utilization concepts, benefits and disadvantages, as well as other characteristics of porous pavements are presented with emphasis on porous asphalt pavements, but the criteria and design approach are applicable to all other porous pavement types. Design considerations include siting problems, load bearing design and hydrologic design. The history of porous pavement development and previous experience with porous pavement by several designers, contractors and operators are described. A computer model for hydrologic performance evaluation of existing or proposed porous pavement systems is also examined. Load bearing design criteria are based on previous work conducted for porous asphalt pavements. Appendices include a sample set of specifications for porous asphalt construction and a list of soils and their permeability classes as prepared by the U.S. Soil Conservation Service.

  11. Knowledge Discovery and Pavement Performance: Intelligent Data Mining

    NARCIS (Netherlands)

    Miradi, M.

    2009-01-01

    The main goal of the study was to discover knowledge from data about asphalt road pavement problems to achieve a better understanding of the behavior of them and via this understanding improve pavement quality and enhance its lifespan. Four pavement problems were chosen to be investigated; raveling

  12. Grout Impregnation of Pre-Placed Recycled Concrete Pavement (RCP) for Rapid Repair of Deteriorated Portland Cement Concrete Airfield Pavement

    Science.gov (United States)

    2007-04-01

    Hammitt (1985) also reports a high failure rate when using cold mix asphalt for crater repairs and recommended that it be abandoned as a technique...cement-treated base, embankment base material, and aggregate for asphalt paving mixtures . RCP has been used successfully for all of these types of...that recycled asphalt pavement ( RAP ) and RCP have a substantial history of usage in pavement construction. He reports that cost savings of 20 to

  13. Evaluation on Low Temperature Performance of Recycled Asphalt Mixture Using Warm Mix Asphalt Technology

    Directory of Open Access Journals (Sweden)

    Xiaolan Duan,

    2015-04-01

    Full Text Available In this paper, the basic idea is about the recycled technology of asphalt mixture, more in-depth study of the lowtemperature performance of warm mix asphalt(WMA.First of all, Including the evaluation of low temperature performance of WMA made of reclaimed asphalt pavement (RAP (passed and not passed 2.36mm screen, and the influence of WMA with RAP mixed of different dosage of dispersant. Then, using the SBS modified asphalt and base asphalt were test at low temperature, research on the influence of different type of asphalt to the low temperature performance of WMA.

  14. CJJ 169-2012《城镇道路路面设计规范》沥青路面设计方法浅析%Analysis of Design Methods for Asphalt Pavement in CJJ 169-2012“Code for Design of Urban Road Pavement”

    Institute of Scientific and Technical Information of China (English)

    李洪; 谭练武

    2015-01-01

    This paper introduces design methods for urban road asphalt pavement from two aspects :one is brief introduction of design methods for asphalt pavement in CJJ 169 -2012 “Code for Design of Urban Road Pavement” according to design flow of asphalt pavement , the other is emphatic comment on major improvements , differences and some problems still existing in CJJ 169-2012 relative to design methods for asphalt pavement in design guidance documents including CJJ 37-90“Code for Design of Urban Roads”, JTG D50 -2006 “Code for Design of Highway Asphalt Pavement”, design methods in American Association of State Highway and Transportation Officials ( AASHTO) and SHELL design method, etc., and proposes opinions and recommendations for these improvements , differences and existing problems .%从2方面对城镇道路沥青路面设计方法进行介绍:一是按照沥青路面设计流程简要介绍CJJ 169—2012《城镇道路路面设计规范》的沥青路面设计方法;二是重点评述CJJ 169—2012相对于CJJ 37—90《城市道路设计规范》、JTG D50—2006《公路沥青路面设计规范》、美国各州公路和运输官员协会( AASHTO)设计法以及SHELL设计法等设计指导文件中沥青路面设计方法进行的主要改进、区别以及依然存在的一些问题,并对这些改进、区别以及存在的问题提出看法和建议。

  15. Finite Element Analysis of Semi-rigid Asphalt Pavement Subjected to Dynamic Vehicle Load%动态载荷作用下半刚性沥青路面动力响应分析

    Institute of Scientific and Technical Information of China (English)

    陈一锴; 何杰; 张卫华; 储庆中

    2012-01-01

    An analysis method investigating dynamic response of semi-rigid asphalt pavement under dynamic vehicle loads based on FVP (Functional Virtual Prototype) and FE (Finite Element) was advanced. The method is capable of analyzing stresses and strains under dynamic, static vehicle loads precisely, which is useful in predicting the fatigue life of semi-rigid asphalt pavement. Multi-DOF FVP model of truck- road was developed in ADAMS and validated with a ride comfort test, the characteristics of dynamic tire loads of wheels excited by B level road were found through simulation. As a 3-D visco-elastic FE model of a segment of semi-rigid asphalt pavement established based on multi-layer elastic system theory, pavement responses under single wheel and dual wheel were analyzed and compared with consideration of the rectangular contact area and the dynamic character, mobility of tire load. Simulation results indicate that the pavement fatigue damage is the comprehensive consequence of horizontal stresses, traverse stresses and vertical stresses induced by dynamic loads. And among which, the alternating variation of horizontal stresses is most important. In addition, the fatigue damage under dual tires is 1.92 times more than that under single tire.%基于功能化虚拟样机和有限元技术,提出一种精确车辆动态载荷作用下半刚性沥青路面响应的分析方法,可实现轮胎动、静载荷在半刚性沥青路面上的精确加载,从而准确预测路面疲劳寿命。基于车辆动力学原理,在ADAMS平台构建重型货车-路面高精度虚拟样机模型,通过实车平顺性实验验证其正确性;在B级路面输入下,通过仿真获得各轴动载荷变化规律;基于弹性层状体系理论构建半刚性沥青路面的3-D粘弹性有限元模型,在同时考虑车辆载荷动态性、移动性及轮胎矩形印迹的基础上,分别分析单、双轮载荷作用下的路面响应。仿真表明水平应力的交变变化是半刚

  16. 环保多功能沥青除冰路面一体化设计研究%Environment-friendly multi-function asphalt pavement de-icing design and mechanism

    Institute of Scientific and Technical Information of China (English)

    丁庆军; 彭馨彦; 姜友生; 陈光新; 毛明

    2012-01-01

    依托湖北杭瑞高速公路工程,为降低沿线行车通过居民区带来的噪音污染,解决冬季路面积雪薄冰带来的行车安全问题,以具有一定结构除冰性能的高连通孔隙沥青路面材料为基体,选用橡胶高黏度改性沥青,并掺人环保型化学抑冰剂,开发设计具有除冰、降噪、抗滑功能材料路面.以不牺牲路用性能为前提,通过测试动稳定度、冻融劈裂强度比、飞散损失、抗剪强度等,确定环保型化学抑冰剂的掺量.同时利用驻波管法、手工铺砂法及轮版法测定空隙化分别为16%、20%、24%、28%的路面材料除冰性能、降噪性能和抗滑性能.测试结果表明,当环保型融雪除冰剂的掺量为2%,空隙率控制在20%左右时,高连通孔隙沥青材料的路面使用性能最佳,具有较好的除冰性能、降噪性能和抗滑性能.%The present study aims to introduce a new approach to reducing expressway noise pollution caused by the roadside traffic and relieving the traffic hazard caused by the snow-ice sliding in winter days by taking the Hangzhou-Ruili Expressway construction project as our case study. In proceeding with our research, we have done a series of experiments and tests for our goals by using high-sticking porous asphalt pavement material to lower the traffic noise by using modified high-viscosity rubber asphalt and environment-friendly organic-inorganic composite deicer to increase the skidding and sliding resistance so as to heighten the de-icing function of the road. In our experiments, we have repeatedly tested the dynamic stability, the freeze-thaw splitting strength ratio, the loss of sliding, shear strength and other parameters concerned so as to determine the appropriate dosage of environment-friendly organic-inorganic composite deicer. And, the eventually, the testing results prove that the pavement performance of the innovated composite pavement asphalt material can reduce the skidding and

  17. The Optimal Design of Emulsified Asphalt Plant-Mixed Cold-Recycling Mixture Used in the Middle and Lower Layer of Asphalt Pavement%基于中下面层的乳化沥青厂拌冷再生配合比优化设计

    Institute of Scientific and Technical Information of China (English)

    王瑞

    2015-01-01

    我国乳化沥青厂拌冷再生混合料一般作为基层使用,国内外研究表明,设计合理的乳化沥青厂拌冷再生混合料同样可以用在中下面层.本研究参考贝雷法级配设计理念,提出以CF比和CA比作为乳化沥青厂拌冷再生设计参数,研究不同CF比和CA比对其路用性能的影响.室内试验结果表明,CF比和CA比存在一个合适的范围使厂拌乳化沥青冷再生沥青混合料的路用性能在此范围内使用效果较好,并根据中下面层的功能特点,考虑乳化沥青冷再生混合料的强度、高温性能和水稳定性能,推荐中粒式乳化沥青厂拌冷再生的CF比区间为(0.7~1.2),CA比为(0.7~1.1).通过试验段对以CF比和CA比选取的级配进行验证,结果表明设计的混合料具有良好的路用性能.%In China,the emulsified asphalt plant⁃mixed cold⁃recycling mixture are commonly used as a base. Both the domestic and foreign research shows that reasonable designed emulsified asphalt plant⁃mixed cold⁃recycling mixture can be used in the middle and lower layer of asphalt pavement. Based on the bailey method,we studied the effect of different CF ratio and CA ratio on the performance of mixture and proposed CF ratio and CA ratio in designing the emulsified asphalt plant⁃mixed cold⁃recycling mixture. All the laboratory experiment results show that when the CF ratio and CA ratio in an appropriate range,the performance of the emulsified asphalt plant⁃mixed cold⁃recycling mixture is good. Considering the functions of the middle and lower layer in asphalt pavement ,and the high temperature stability and water stability of the emulsified asphalt plant⁃mixed cold⁃recycling mixture,we recommend that the CF ratio is between 0.7 and 1.2,and the CA ratio is between 0.7 and 1.1. Through the test section,the results show that it has good performance of the designed emulsified asphalt plant⁃mixed cold⁃recycling mixture.

  18. Field test and research on vehicle load induced dynamic pore pressure in asphalt pavement%车载引起的沥青路面内动水压力现场试验研究

    Institute of Scientific and Technical Information of China (English)

    汤潍泽; 欧金秋; 崔新壮; 楼俊杰; 肖溟; 张炯; 黄丹; 侯飞

    2015-01-01

    In order to study the influence on moisture damage of asphalt pavement caused by dynamic pore pressure due to moving vehicle loads,and explore the time histories of dynamic stress and dynamic pore pressure in the pavement surface layers,the heat-resistant dynamic stress and pore pressure sensors were developed and used to measure the dynamic stresses and pore pressures in the field,and the field measured data of dynamic pore pressure was acquired. Based on the Biot’s consolidation theory,a numerical fluid-solid coupling simulation method reflecting mobile effect of wheel load was used to analyze the response of pavement under the actual condition.The time history of dynamic pore pressure in pavement was quantitatively analyzed.Numerical simulation results matched well with in situ test data.The pump-suction effect of dynamic pore pressure that continuously generated in pavement void under cyclical vehicle loads led to the reduce of the asphalt-aggregate bond strength and further triggered the moisture damage.This study verified the hydraulic drive mechanism of moisture damage,and provided a theoretical guild for the moisture damage research and pavement design.%为了研究移动车载引起的动水压力对沥青路面水损坏产生的影响,探究路面层内动应力变化及动水压力的长消规律,利用自主研制的耐高温动应力和动水压力传感器,对现场行车荷载引起的动应力及动水压力进行实测,获取了动水压力的实测数据;并且基于 Biot 固结理论,利用一种反映移动效应的车轮荷载数值模拟方法,对实测工况下路面情况进行了动态流固耦合分析,定量研究了路面层内的动水压力长消规律。发现现场实测与数值模拟结果基本一致。沥青路面在周期行车荷载作用下,路面空隙中不断产生动水压力的泵吸作用,导致沥青混合料强度下降,进而引发水损坏。该成果验证了水损坏的水力驱动机理,

  19. Influence of Load Factors on Rutting of Asphalt Pavement on Large Longitudinal Slope%影响长大纵坡沥青路面车辙的荷载因素分析

    Institute of Scientific and Technical Information of China (English)

    王翼

    2014-01-01

    为了找到影响长大纵坡沥青路面车辙的最不利荷载因素,从交通荷载的角度提出车辙防治措施,对坡度、车速和超载对长大纵坡路面车辙的影响进行了计算分析和比较。研究表明,坡度对长大纵坡的路面车辙的影响较小;与坡度相比,较低的车速更易导致车辙病害的产生;车辆超载是导致车辙产生和进一步恶化的最不利因素。%To find out the critical load factor leading to rutting on large longitudinal slope and control measures,this paper analyzes the influence of slope,speed of vehicle and overload on rutting on the asphalt pavement on large longitudinal slope.The result indicates that the slope has limited influence on the rutting.There is a direct correlation between speed of vehicle and rutting.The overload is proved to be the critical factor leading to excessive pavement rutting on large longitudinal slope.

  20. 碳纤维-玻纤格栅抗凝冰沥青路面对策研究%Ice-melting Countermeasure Research of Carbon Fiber-glass Fiber Grille Asphalt Pavement

    Institute of Scientific and Technical Information of China (English)

    李红; 张谢东

    2013-01-01

    针对贵州地区凝冰危害等级,为了制订与凝冰危害等级相对应的抗凝冰路面响应对策,采取了将凝冰危害等级转换为凝冰厚度指标后再进一步研究抗凝冰路面响应对策的策略.在进行指标转换后,进一步研究了碳纤维-玻纤格栅抗凝冰沥青路面的融凝冰功率-升温时间关系、融凝冰能力,最后提出了具体的响应贵州地区凝冰危害的对策.%For the Guizhou province ice warning level,to make the anti-ice asphalt pavement response measures adapt for the ice warning level,the paper converted the warning level to ice thickness indicators before studying the ice-melting countermeasures.Then the paper further studied the relationship of ice-melting power-heating-up-time and ice-melting-ability of the pavement,and finally put forward specific response countermeasures to the ice warning.

  1. 半柔性路面大空隙基体沥青混合料设计与性能研究%Study on the Design and Performance of Large Void Basic Asphalt Mixture for Semi-flexible Pavement

    Institute of Scientific and Technical Information of China (English)

    王凤华; 王伟明; 吴旷怀

    2015-01-01

    In this paper,three kinds of large void basic asphalt mixture with different voidages for semi-flexible pavement are designed based on the coarse aggregate voids-filling method (CAVF).The Marshall Test,permeability test,determination of voidage and other performance tests are presented.The results show that the designed voidge and measured voidge are close in the three kinds of basic-asphalt-mixture with different viodages designed by CAVF,and have the appropriate strength,good drainage per-formance,the mortar can be poured strong.%基于矿料主骨料空隙体积填充法(CAVF)设计了3种不同空隙率的半柔性路面大空隙基体沥青混合料,采用马歇尔试验、透水试验与空隙率测定等试验评价其性能。结果表明,采用 CAVF 法设计的3种不同空隙率的基体沥青混合料,设计空隙率与实测空隙率较为接近,且具有适当的强度,较好的排水性能,砂浆的可灌入性强。

  2. 基于公路沥青面层的碎石针状颗粒超量分析%On overfilling analysis of gravel needle-shaped particles based on asphalt pavement of roads

    Institute of Scientific and Technical Information of China (English)

    薛艳霞

    2015-01-01

    The paper illustrates the quality demands for the concrete asphalt layer on the gravels,introduces the basic procedure for the manufac-turing of the gravel materials,and analyzes the reasons for the higher contents of the needle-shaped particles in gravels,and points out the effec-tive measures to control the particles contents,so as to ensure the construction quality of the asphalt pavement of roads.%阐述了混凝土沥青面层对碎石的质量要求,介绍了碎石集料生产工艺的基本流程,从原材料、喂料、加工工艺等方面入手,分析了碎石针片状颗粒含量偏高的原因,并提出了控制针状碎石含量的有效措施,从而保证公路沥青面层的施工质量。

  3. The Construction Technology and Quality Control of Hot Mix Asphalt Concrete Pavement%热拌沥青混凝土路面施工工艺及质量控制

    Institute of Scientific and Technical Information of China (English)

    卢宪法

    2014-01-01

    热拌沥青混凝土作为公路路面施工的重要组成部分,其选材、施工工艺、质量控制等流程对公路的建成性能都具有决定性的影响。笔者结合近年来的学习工作经验,主要从材料、沥青混凝土的配比、施工工艺、质量控制几个方面作简要阐述。%Hot mix asphalt concrete as an important part of highway pavement construction, the material selection, constr-uction technology and quality control hasa decisive influence on the process of highway completed performance. The author combines with work experience in recent years to elaborate from several aspects of material, the ratio of asphalt concrete, construction technology, and quality control, etc.

  4. Asphalt pavement surface 3D data acquisition system based on line-structure light%基于线结构光的沥青路面三维数据采集系统

    Institute of Scientific and Technical Information of China (English)

    孙朝云; 呼延菊; 李伟; 魏子尧; 刘祝

    2016-01-01

    To solve the problem of poor real-time,low accuracy of current asphalt pavement surface 3D data acquisition system,which can not provide 3D pavement data comprehensively,this paper studied an asphalt pavement 3D data acquisition system based on line-structure light.The system was a three-dimensional equipment with optical and electrical integration and automation,which was designed for domestic road three-dimensional information detection.It could realize data collection,analysis,processing,3D display for asphalt pavement surface topography.The system used infrared laser light source,planar array CCD camera and digital image detection technology.This system computed the 3D depth information based on laser triangulation algorithm,finished 3D reconstruction of road surface morphology by use of MATLAB software to obtain 3D display after reconstruction,and did quantitative analysis of detection results.Based on modular design,this system mainly consisted of power supply module,salve computer control module,counting trigger module,laser triangulation detection module,GPS module and data processing module.The 3D data of asphalt pavement were obtained through testing software's driving hardware modules.The results show that modular design improves anti-interference,making the system structure simple and clear,and relieve from the complex wires.It is convenient for debugging,maintenance,shorten development cycle,and the cost for development and maintenance is also reduced.The results also show that the system can not only meet the requirements of asphalt pavement 3D data acquisition and the requirements of real-time detection,but also provide vivid and visualized 3D visual topography.17 figs,21 refs.%针对目前沥青路面表面形貌三维数据采集实时性差、精确度低,难以准确全面地提供路面三维构造形态的问题,研究了基于线结构光的沥青路面表面形貌三维数据采集系统.该系统是针对中国道路三维信息检测要求

  5. Application of Energy Efficient Warm Mix Asphalt Concrete in Pavement Construction in Extremely Cold Areas%低能耗温拌沥青混凝土施工技术在高寒地区路面工程中的应用

    Institute of Scientific and Technical Information of China (English)

    唐忠平; 宋远慧

    2011-01-01

    温拌温铺沥青混凝土初次在青藏高原公路施工技术上的尝试和应用,克服了低温作业的影响,有效降低有害气体和粉尘颗粒排放,同时又保证了与热拌沥青混凝土基本相同的路用性能和施工和易性,为工程顺利实施赢得时间效益。%The first application of warm mix asphalt concrete in highway construction in Qinghai-Tibet Plateau overcame the impact of low temperature,reduced harmful gas and dust particles effectively and at the same time ensured the same pavement performance and construction workability with that of hot mix asphalt,which gained time efficiency for successful implementation of pavement engineering.

  6. Discrete element modelling of permanent pavement deformation in granular materials

    OpenAIRE

    Cai, Wei

    2015-01-01

    The permanent deformation of a pavement due to vehicle load is one of the important factors affecting the design life as well as the maintenance cost of a pavement. For the purpose of obtaining a cost-effective design, it is advisable to predict the traffic-loadinduced permanent pavement deformation. The permanent deformation in pavements (i.e. rutting) can be classified into three categories, including the wearing of the asphalt layers, compaction, and shear deformations. In the present stud...

  7. Influence of Interlayer Contacting Surface and Condition on Mechanical Indexes of Asphalt Pavement%层间接触位置和状态对沥青路面力学指标的影响

    Institute of Scientific and Technical Information of China (English)

    张争奇; 张苛; 罗要飞

    2015-01-01

    In order to study the influence of interlayer contacting surfaces and condition on me-chanical index of asphalt pavement,the paper selected typical semi-rigid base pavement structure of ex-pressway.The pavement mechanical indexes under different contacting surface were calculated by BISAR 3.0.The changing laws of asphalt pavement mechanical indexes and fatigue life under different contac-ting condition between base and surface course were discussed.The results show that:the influence of smooth condition between surface courses,surface course and base,base and subbase on tensile stress, tensile strain and shear stress is prominent.Deflection is slightly affected by different interlayer contacting surface.The stress and strain of pavement increase gradually with the increasing of sliding coefficient be-tween base and surface course.The tensile stress,shear stress and tensile strain of following layer under completely sliding condition are 2.93 times,2.45 times and 69.36 times of fully continuous condition re-spectively.Decreasing range of fatigue life is small when the sliding coefficient between base and surface course is less than 0.6,then decreasing range increases.When the base and surface course are in com-pletely smooth,the fatigue life declines 44.5%.%为研究沥青路面层间接触位置和接触状态对路面结构内力学指标的影响,选择典型的高速公路半刚性基层路面结构,利用 BISAR3.0软件计算分析不同层间接触位置时的路面力学指标,并探讨不同基面层接触状态下沥青路面力学响应和疲劳寿命的变化规律。结果表明:面层与面层、面层与基层、基层与底基层之间在完全光滑时对拉应力、拉应变、剪应力影响显著,弯沉受层间接触位置的影响变化不大;随着基面层间滑动系数的增加,路面结构内的应力、应变逐渐增大,在完全滑动时下面层底的拉应力、剪应力和拉应变分别是完全连续时的2.93倍、2

  8. Design of microwave absorbing asphalt mixture pavement material%吸波沥青混合料路面材料设计

    Institute of Scientific and Technical Information of China (English)

    袁斌; 刘銮成; 李敬才

    2012-01-01

    Directing against low microwave absorbing property of limestone aggregate asphalt mixture,asphalt mixture absorbing microwave with 3∶ 7 and limestone aggregate was prepared.The mixture was heated with a microwave oven for 60 s and the surface temperature was measured.The results indicate that the asphalt mixture absorbing microwave had higher temperature enhancement efficiency.%针对普通石灰岩集料沥青混合料吸波效率低等问题,按照铁矿石集料与普通石灰岩集料体积比3∶7,配制吸波沥青混合料,利用微波炉并加热60 s后,测试混合料表面温度差别,结果表明,吸波沥青混合料具有明显的升温效率高的特点。

  9. Experiment of Reasonable Content of Tack Asphalt Coat and Analysis of its Effect Mechanism to Pavement Performance%黏层油合理用量试验及其对路面性能影响机理分析

    Institute of Scientific and Technical Information of China (English)

    成猛; 艾长发; 李永明

    2011-01-01

    为探讨黏层油合理用量及其对路面性能的影响机理,采用直剪试验、斜剪试验及小梁弯曲试验分别测定了不同黏层油用最的复合圆柱体试件的抗勇强度及复合小梁试件的抗弯拉应变.研究结果表明:(1)在沥青混凝土路面层间喷洒黏层油,可以增强沥青混凝土面层的结构整体性,并且黏层油的喷洒量存在一个最佳值,在此最佳用量下,沥青混凝土面层层间黏结更有效,使用性能显著提高;(2)以复合试件路用性能达到最佳为基准,相同温度条件、不同试验方法所确定出的最佳黏层油用量不同,相同试验方法、不同温度条件所确定出的最佳黏层油用量也不同;(3)对于黏层油合理用量的确定,应采用正交试验方法,以便综合考虑温度条件、试验方法等因素的影响.%The shear strength of composite cylinder samples and the flexural-tensile strain of composite beam samples are measured respectively using three methods of Direct Shear Test, Bevel Shear Test and Flexural Test in lab. To study the reasonable content of tack asphalt coat and its effect mechanism to pavement performance. The results show that, firstly, the structural integrity can be improved by spraying tack asphalt on the inter-surface, and there is an optimum content of tack asphalt coat for usage, which can put the cohesive effectiveness and road performance in the higher level. Secondly, the optimum content is different under the condition of different temperatures and different test methods as well, based on the best road performance of composite samples. Last, orthogonal experiment should be adopted to get the reasonable content of tack asphalt coat, to take several factors into overall consideration, such as temperatures and test methods.

  10. Polymer Blends Modified Asphalt

    Institute of Scientific and Technical Information of China (English)

    WANG YunPu; LI YuFeng; GAO XiaoHui; WANG RongMin

    2001-01-01

    @@ Asphalt is an important low-cost thermo-plastic material which is widely used for construction, in particular as road-paving. Therefore it is exposed to a wide range of load and weather conditions. Increasing traffic factors, such as heavier loads, higher traffic volume and higher tire pressure demand higher performance pavements. However, this kind of materials does not have good mechanical properties because it is hard and brittle in cold weather, and soft and fluid in a hot environment.

  11. Linking asphalt binder fatigue to asphalt mixture fatigue performance using viscoelastic continuum damage modeling

    Science.gov (United States)

    Safaei, Farinaz; Castorena, Cassie; Kim, Y. Richard

    2016-08-01

    Fatigue cracking is a major form of distress in asphalt pavements. Asphalt binder is the weakest asphalt concrete constituent and, thus, plays a critical role in determining the fatigue resistance of pavements. Therefore, the ability to characterize and model the inherent fatigue performance of an asphalt binder is a necessary first step to design mixtures and pavements that are not susceptible to premature fatigue failure. The simplified viscoelastic continuum damage (S-VECD) model has been used successfully by researchers to predict the damage evolution in asphalt mixtures for various traffic and climatic conditions using limited uniaxial test data. In this study, the S-VECD model, developed for asphalt mixtures, is adapted for asphalt binders tested under cyclic torsion in a dynamic shear rheometer. Derivation of the model framework is presented. The model is verified by producing damage characteristic curves that are both temperature- and loading history-independent based on time sweep tests, given that the effects of plasticity and adhesion loss on the material behavior are minimal. The applicability of the S-VECD model to the accelerated loading that is inherent of the linear amplitude sweep test is demonstrated, which reveals reasonable performance predictions, but with some loss in accuracy compared to time sweep tests due to the confounding effects of nonlinearity imposed by the high strain amplitudes included in the test. The asphalt binder S-VECD model is validated through comparisons to asphalt mixture S-VECD model results derived from cyclic direct tension tests and Accelerated Loading Facility performance tests. The results demonstrate good agreement between the asphalt binder and mixture test results and pavement performance, indicating that the developed model framework is able to capture the asphalt binder's contribution to mixture fatigue and pavement fatigue cracking performance.

  12. Evaluation on Low Temperature Performance of Recycled Asphalt Mixture Using Warm Mix Asphalt Technology

    OpenAIRE

    Xiaolan Duan,; Chunge Li

    2015-01-01

    In this paper, the basic idea is about the recycled technology of asphalt mixture, more in-depth study of the lowtemperature performance of warm mix asphalt(WMA).First of all, Including the evaluation of low temperature performance of WMA made of reclaimed asphalt pavement (RAP) (passed and not passed 2.36mm screen), and the influence of WMA with RAP mixed of different dosage of dispersant. Then, using the SBS modified asphalt and base asphalt were test at low temperature, researc...

  13. A review of asphalt and asphalt mixture aging

    Directory of Open Access Journals (Sweden)

    Wilmar Darío Fernández-Gómez

    2012-09-01

    Full Text Available This paper presents an extensive review of the pertinent literature regarding asphalt and asphalt mixture Aging. Aging affects flexible pavement performance and is produced by intrinsic and extrinsic variables as well as exposure time. Intrinsic variables include asphalt and aggregate properties, a mixture’s asphalt content, binder film thickness and air void content; extrinsic variables are associated with production (short-term aging and exposure to environmental field conditions (long-term aging. Taken together, both variables demonstrate that aging results from three distinct mechanisms: volatilisation, oxidation and steric hardening. Temperature, pressure and photo degradation treatments are used to simulate aging in the laboratory and empirical and semi-empirical models are created to represent and study aging. Aging increases asphalt complex modulus and decreases the phase angle. Mixtures become stiffer while fatigue life becomes reduced. Carbonyl and sulfoxide group formation in asphalt are often studied as such chemical changes show oxidation in aged asphalts. The prevailing models used to predict asphalt aging are discussed, though more comprehensive research into asphalt aging is still needed.

  14. 层间状态对沥青路面疲劳开裂与位移的影响%Influence of Interfacial Bond on Fatigue Crack and Displacement of Asphalt Pavement

    Institute of Scientific and Technical Information of China (English)

    龚红仁; 邹晓翎; 朱洪洲; 从志敏; 赵殿鹏

    2012-01-01

    The objective of this paper is to investigate the causes of the interlayer debonding, slippage and fatigue cracking of asphalt pavement. Based on elastic layered system, the BISAR and finite computer program ABAQUS were used, reduced spring compliance(ALK) and Pell's fatigue model were included to indicate the interfacial bonding state and predict fatigue life, respectively. The influence of interfacial bond state on fatigue life, surface and interlayer displacement of asphalt pavement were examined. The results showed when interlayer condition turn from full-bond to intermediate or slip, the fatigue life of asphalt pavement decreases sharply, in the case of slip, it is only 1% that of full bond. With horizontal force applied, horizontal displacement at surface was greatly influenced by interlayer bond. Both in cases with or without horizontal force, the tensile strain at the bottom of the wearing course was influenced largely. Besides, the impact depth of tensile strain increased for the existence of horizontal force. The existence of horizontal force and bad interlayer bond condition were in the contributors to the surface initiated cracking.%为了分析沥青路面层间脱开、滑移和疲劳开裂病害的成因,基于弹性层状体系理论,利用BISAR程序和ABAQUS有限元分析软件,分别通过减缩弹簧柔量ALK、Pell疲劳模型表征层间结合状态和路面疲劳性能,研究了有无水平力作用时ALK对沥青路面疲劳寿命、路表位移和层间位移的影响.结果表明:沥青路面疲劳寿命由层间连续转变为非连续时迅速下降,层间光滑状态下的疲劳寿命仅为连续时的1%;有水平力作用时,层间结合状态(连续、半结合、光滑)对路表水平位移影响显著;无论有无水平力作用,层间结合对磨耗层层底的弯拉应变分布有重要影响,且水平力会使路面结构层内的弯拉应力分布的深度增加;水平荷载作用和层间接触不良是自上而下型

  15. Analysis for Dynamic Response of Semi-Rigid Base Asphalt Pavement Based on APT Test%基于 APT 试验的半刚性基层沥青路面动力响应分析

    Institute of Scientific and Technical Information of China (English)

    庄传仪; 叶亚丽; 张宁

    2014-01-01

    In this article, the dynamic response of the semi-rigid asphalt pavement is studied through the acceleration and loading test on the full-scale test road , which provides the basis for the prediction and structural design of pavement performance .Through the APT test road construction with the two structures of cement stabilized macadam and lime-fly ash stabilized macadam , strain gauges , vertical stress sensors and temperature sensors are laid to make the real-time collection of the dynamic stress , strain and deflection of the pavement structure as well as the pavement temperature field , to analyze the correlation between the temperature and the responses of the structural dynamic strain and stress and also the calculation of the pavement layer moduli and mechanical response based on the FWD deflection basin .The research results are as follows .The tensile strain of semi-rigid base layer is less affected by temperature .The structural deflection is greatly affected by the thickness of the semi-rigid base .The thinner the semi-rigid base thickness is , the faster the decline of its modulus is .With the function of repeated loads , the declining rate of tensile strain of semi-rigid base layer increases first and then slowly decreases .In the early service ( less than 25 .6 million times of standard axle loads) , the modulus of the semi-rigid base decays slowly and when the pavement is loaded with 100 million cumulative equivalent standard axle loads , its modulus decays about 55%.%通过足尺试验路加速加载试验研究半刚性基层沥青路面的动力响应,为路面性能预估及结构设计提供依据。通过修筑水泥稳定碎石基层和二灰稳定碎石基层2种结构APT试验路,埋设水平应变仪、竖向压应力传感器和温度传感器,实时采集路面结构动应力、应变、弯沉和路面温度场,分析温度与结构动应变、应力响应的关系,开展基于FWD弯沉盆的路面结构层模量

  16. Evaluation of Asphalt Concrete Pavement Based on Passenger Ride Comfort Level%基于驾乘舒适性的沥青混凝土路面评价

    Institute of Scientific and Technical Information of China (English)

    王锋; 张金喜

    2014-01-01

    In order to provide a theoretical basis for the ride comfort level evaluation, daily management,and maintenance of asphalt concrete pavement,the performance parameters and three-directional acceleration data of highway pavements were measured indoors and outdoors. Using these data,the relationship between the mean square of weighted acceleration and the pavement performance was studied. A linear regression equation that reflects the relationship between the root mean square of weighed acceleration,speed,and roughness was obtained by fitting 214 groups of experimental data. In addition,the outdoor experimental results were verified using a driving simulator. The results show that the root mean square of weighed acceleration is strongly correlated with roughness,moderately correlated with the speed,and weakly correlated with the dynamic friction coefficient. Given a certain dynamic friction coefficient,the ride comfort level of an asphalt concrete pavement reduces with its roughness and driving speed increasing. When the roughness is 1. 35 and 3. 05 mm/m,the maximum speed with an appropriate ride comfort level is 124. 1 and 88. 7 km/h,respectively.%为给沥青混凝土路面舒适性评价及日常管理养护提供理论依据,在测得室内外大量道路路面性能参数及三向加速度数据的基础上,研究了加权加速度均方根值与道路路面性能参数之间的关系.运用214组有效室外实验数据,拟合了加权加速度均方根、行驶速度与平整度关系的线性回归方程,并用驾驶模拟舱对室外实验结论进行了验证.结果表明:加权加速度均方根与平整度强相关,与速度中等程度相关,与动态摩擦系数弱相关,在动态摩擦系数一定的条件下,驾乘舒适性随平整度及行驶速度的增加而降低;当平整度为1.35和3.05 mm/m时,满足驾乘舒适性的最大速度分别为124.1和88.7 km/h.

  17. Acquisition System for Three-Dimensional Surface Texture of Asphalt Pavement Based on Digital Image Processing%基于数字图像技术的沥青路表面三维构造获取系统

    Institute of Scientific and Technical Information of China (English)

    刘亚敏; 韩森; 徐鸥明

    2014-01-01

    In order to make an objective and true evaluation on three-dimension surface texture of asphalt pavement,an acquisition system for surface three-dimensional texture of asphalt pavement was developed based on the digital image processing. First,the classical Lambertian diffuse model was used to obtain three red,green,blue images. Then photometric stereo method was employed to calculated the surface gradients in x and y directions with the reflection intensity of three images. Finally the Frankot-Chellappa global integration algorithm was applied to making the Fourier transformation of the gradients. Thus the heights were obtained and the surface texture was reconstructed. The results indicate that the accuracy of height value obtained by the acquisition system is 0. 000 1 mm,which meets the requirement for analysis of texture depth;the correlation coefficient between the results of this system and the traditional sand patch test is 0 . 887 5 ,which demonstrates that this acquisition system is practical.%为了客观、真实地评价沥青路表面三维构造,利用数字图像技术研制了一种沥青路表面三维构造获取系统.首先基于经典的漫反射模型---the Lambertian Model,获取3张红、蓝、绿二维图像;然后根据光度立体法,利用3张图像的反射光强度计算其x、y方向上的梯度数据;最后借助Frankot-Chellappa全局积分算法将梯度数据进行傅立叶变换,计算得到高度值,实现路表面构造的三维重建.研究结果表明,该系统获取的高度值精度达到0.0001 mm,满足分析构造深度的要求;与传统方法---铺砂法的测试结果相关系数R=0.8875,相关性较好,证明了该系统应用的可行性.

  18. 水泥路面加铺沥青改造质量控制技术%Paving asphalt concrete pavement quality control techniques

    Institute of Scientific and Technical Information of China (English)

    王小兵

    2014-01-01

    总结归纳了旧路面病害检测的内容及方法,从施工管理角度出发,对沥青面层的加铺进行了质量控制,包括沥青、集料、设置试验段等内容,并通过平整度、渗水系数等控制掺量检验,对改造工程质量进行了检查验收。%This paper sums up the old road surface plant disease detection contents and methods, from the angle of construction management of asphalt road surface of the road to quality control, such as asphalt, aggregate, set up test section content, finally, through permeable coefficient control parameter inspection, inspection on project quality acceptance.

  19. 加铺超薄罩面后沥青路面就地热再生适用性分析%Applicability Analysis of Asphalt Pavement Hot in Place Recycling of Ultra-thin Wearing Course

    Institute of Scientific and Technical Information of China (English)

    张怀宇; 张剑波

    2014-01-01

    This paper analyzes ultra-thin wearing course material.The results and analyses show that gradation and asphalt aggregate ratio of the material meet the standard of AC-13 Technology,and ul-tra-thin wearing course material can be regenerated.High temperature stability,moisture stability,low temperature property meet the requirements of HMA in specifications.Pavement compactness,smooth-ness,water permeability coefficient index can meet the requirements of specification after regeneration.%对加铺超薄磨耗层后的路面沥青混合料进行试验分析。试验结果与分析表明:加铺超薄磨耗层后的混合料级配和油石比满足规范的 AC-13的技术要求,说明超薄磨耗层路面可进行再生利用。对再生混合料进行高温性能、水稳定性能和低温性能试验,发现含有超薄磨耗层的再生混合料的高温性能、水稳性能和低温性能均满足规范要求。再生后路面压实度、平整度、渗水系数等指标满足规范要求。

  20. Research on workability comparison of old material regeneration approaches of asphalt pavement%沥青路面旧料再生方式适应性比较研究

    Institute of Scientific and Technical Information of China (English)

    余波

    2015-01-01

    分析了沥青路面旧料再生技术的应用现状,根据再生方式的选择原则,对厂拌热再生、就地热再生、厂拌冷再生、就地冷再生四种再生方式进行了比较,阐述了各种方式的优缺点,以选择出适合的再生方式进行推广应用。%The paper analyzes the application of the old material regeneration approaches of asphalt pavement,compares the hot mix-plant recy-cling,hot in-place recycling,cold in-plant recycling,and cold in-place recycling according to the selection principle for the recycling approa-ches,and illustrates their advantages and disadvantages,so as to extend the application of the proper recycling method.

  1. Research on deicing effect of self-stress elastic asphalt mixture pavement%自应力弹性沥青混合料路面除冰效果研究

    Institute of Scientific and Technical Information of China (English)

    贺先访

    2016-01-01

    The rutting specimens were poured water and were placed in low temperature to make them freeze into ice. The rut meter was used to roll of the test pieces in different temperature,dosage of rubber particles and ice thickness,and the broken rate was calculated to evaluate the deicing effect of self-stress elastic asphalt mixture pavement. The results show that the deicing effect of SEAM increases with the adding of rubber particles,and decreases with the reducing of temperature and increasing of the ice thickness.%采用在车辙试件上洒水并在低温环境下凝冰的方法,模拟了沥青路面结冰情况,并在不同温度、橡胶颗粒掺量以及凝冰厚度的条件下,用车辙仪对凝冰试件进行了碾压,通过计算不同条件下的冰层破损率,评价了自应力弹性沥青混合料路面的除冰效果,结果表明,SEAM的除冰效果随橡胶颗粒掺量的增加而提高,随温度的降低和冰层厚度的增加而下降.

  2. On the Application of the Hot-in-place Recycling Technology of Damaged Asphalt Pavement in the Urban Road%旧沥青路面就地热再生技术在城市道路中的应用研究

    Institute of Scientific and Technical Information of China (English)

    宋金利

    2016-01-01

    The hot-in-place recycling of asphalt pavement refers to HIR. It means using the hot-in-place recycling to carry out the heating, scarifying, remixing, paving, leveling of the old asphalt pavement. And a certain proportion of the new aggregate, new asphalt and regeneration are incorporated to produce a new pavement. The hot-in-place recycling of asphalt pavement can use the mixture of old road asphalt for 100%. This technology has good economic value, environmental value and technology value. At present, the application of it in the domestic highway is more common, but the application of it in urban road is still relatively less. In this paper, the application of hot-in-place recycling of a main road in Qinhuangdao is used to introduce the overall design, process mix proportion design and the quality control of this technology.%沥青路面就地热再生技术,英文简称(HIR),是指利用沥青路面热再生重铺机组对旧沥青路面进行就地加热、翻松、复拌、摊铺、整平,并掺入一定比例的新骨料、新沥青、再生剂等一次成型新路面,沥青路面就地热再生可100%利用旧路面沥青混合料,这种技术经济价值、环境价值、技术价值非常优越,目前国内公路上应用较为普遍,城市道路应用还比较少,本文将结合秦皇岛城市内一条主干道沥青路面就地热再生实例应用情况,对此技术的方案总体设计、工艺流程、配合比设计、质量控制进行了详细的介绍.

  3. 基于有限元方法的应力吸收层延缓反射裂缝分析%Analysis on the anti-crack Performance of Asphalt Pavement Based on Finite method

    Institute of Scientific and Technical Information of China (English)

    王鹏; 李昆; 黄卫东

    2011-01-01

    In China semi-rigid base course material accounts for 95% of subbase material in various grade highwayu at present. Though with the advantage of high strength plate and good freezing resistance, semi-rigid asphalt road is easy to crack because of shrink and low-temperature crack. Many measures have been taken including increasing the thickness of asphalt surface, using link structure or stress-absorbing interlayer and so on. But the focus of these measures are different and the function mechanisms are various.3-D Finite Element Modeling is used to model and analyze the typical road structure. Continuity and completely smooth state are considered. Under least favorable load condition, the influence of asphalt surface thickness on stress state of bottom of pavement is analyzed. Analysis shows that solely incerease the thickness of pavement is not the effective measure to postpone the reflective crack. The result also indicates the importance of adhesive property between layers. Though analysis also shows the rational thickness and modulus of stress-absorbing interlayer, and the adhesive strength is emphasized.%半刚性材料目前占到我国各等级公路路面基层材料用量的95%以上,半刚性基层沥青路面虽然具有板体强、抗冻性好等诸多优点,但是容易出现反射裂缝.国内外对半刚性基层沥青路面反射裂缝的防治包括增加沥青面层厚度、在基层与面层之间增加级配碎石层或应力吸收中间夹层等多种方式.这些措施的侧重各有不同,综合利用多种防裂措施与方法可以达到最佳的防裂措施.力图通过三维有限元建模分析,分别考虑层间连续和层间光滑两种状态,施加正荷载和偏荷载,用以分析典型路面结构中路面厚度对面层底部受力状态的影响,得出单纯增加路面厚度并非最佳防裂手段,并论证了保持良好层间粘结对与延缓反射裂缝的重要意义.并通过荷载作用下加铺应力吸收层的路面

  4. 青藏地区沥青路面多功能养护车吊臂的设计%Lifter design of mulifunctional asphalt pavement road maintenance truck for Qinghai-Tibet aera

    Institute of Scientific and Technical Information of China (English)

    张军; 张卫亮; 李锐; 马骉; 叶敏; 毛雪松; 张道配

    2014-01-01

    针对青藏地区沥青路面的快速养护需求而现有养护设备应用受限的问题,提出开发小型快速多功能养护车以提高养护质量和养护效率。分析寒区二级公路的养护需求,提出以冷补料为养护材料,以东风卡车DF140为平台,设计集成沥青路面切割、破碎、清缝、冷补料二次加热搅拌和压实等功能的快速多功能沥青路面养护车。以700 mm的安全距离分析了4种起吊方案,确定了电动卷扬的侧面起吊方案,设计了臂度和臂长均为1600 mm的吊臂结构,并以300 kg的起吊重量对吊臂进行了倾翻分析和结构强度分析。实验结果表明,抗倾翻力矩与倾翻力矩之比大于16,起吊最大变形量为1.98 mm,验证了吊臂的结构稳定性。研究的小型快速多功能养护车解决了高海拔低温地区快速养护的空白,对改善青藏高海拔地区的工人作业和提高养护效率意义重大。%According to the fast maintenance requirement of asphalt pavement and the constrained application of large scale maintenance truck in Qinghai-Tibet area, a small scale multifunctional road maintenance truck was designed to solve the problems and to improve the quality and efficiency of maintenance road. On the analysis of secondary level road requirement, cold patch asphalt mixture was chosen as the maintenance material. Based on the platform of DF140 vehicle, multifunctional road maintenance truck was designed with the function of asphalt pavement cutting, crushing, seam clearing, compacting, cold patch heating and tools lifting up and down. In order to solve the fast tool lifting problem, four lifting means with 700 mm safety gap were compared and electric hoist with side lift method was used to design the lifter. With the maximum lifting weigh of 300 kg, the stabili-ty and structure stress of the lifter were analyzed. The results indicated that the ratio of anti-tilting torque and tilting torque is 16 and the maximum displacement

  5. CRC+AC复合式路面的合理配筋率%Reasonable Reinforcement Ratio of Continuously Reinforced Concrete Composite Asphalt Pavement

    Institute of Scientific and Technical Information of China (English)

    李盛; 刘朝晖; 李宇峙

    2012-01-01

    针对CRC+ AC复合式路面的结构特点和现有研究的不足,对现行规范的纵向配筋设计进行了分析,运用传热学理论和有限元法,研究了AC层的温度效应,计算和分析了AC层温度效应对CRC+ AC复合式路面纵向配筋率的影响规律.研究结果表明:CRC+ AC复合路面结构的纵向配筋设计不需要考虑剥落、渗水和冲断破坏,只需考虑钢筋的拉断破坏即可;由于AC层的隔热作用明显,CRC+ AC复合路面结构的纵向配筋率可以相应减少,以AC层厚度10 cm为例,CRC层的纵向配筋率可减少0.12%左右;钢筋的架设建议采用滑动支架,纵向钢筋的连接建议采用绑扎方式,搭接长度约为35倍钢筋直径.%Focused on the structure characteristics and the flaws of existing studies of CRC + AC composite pavement, longitudinal reinforcement design in current specifications was analyzed. By using heattransfer theory and finite element method, temperature effect of AC layer was researched, and the influence of temperature effect of AC layer on longitudinal reinforcement ratio of CRC + AC composite pavement was calculated and analyzed. The results show that ( 1) longitudinal reinforcement design of CRC + AC composite pavement needs not to consider spalling, seepage and thrust failure, just needs to consider tensile failure of reinforcement; (2) longitudinal reinforcement ratio of CRC + AC composite pavement can be reduced due to the efficient heat insulation of AC layer, for instance, the thickness of AC layer is 10 cm, the longitudinal reinforcement ratio of CRC layer can be reduced by about 0. 12%. It is recommended that the sliding stent be used in reinforcement erection, the banding way be used to joint longitudinal reinforcement, and the overlapped length is about 35 times the reinforcement diameter.

  6. Cooler reflective pavements give benefits beyond energy savings: durability and illumination

    Energy Technology Data Exchange (ETDEWEB)

    Pomerantz, Melvin; Akbari, Hashem; Harvey, John T.

    2000-06-01

    City streets are usually paved with asphalt concrete because this material gives good service and is relatively inexpensive to construct and maintain. We show that making asphalt pavements cooler, by increasing their reflection of sunlight, may lead to longer lifetime of the pavement, lower initial costs of the asphalt binder, and savings on street lighting and signs. Excessive glare due to the whiter surface is not likely to be a problem.

  7. Discussion of Popularization and Application of Asphalt Pavement Recycling Technology%浅谈沥青路面再生技术的推广应用问题

    Institute of Scientific and Technical Information of China (English)

    尤江

    2014-01-01

    本文主要介绍了沥青再生技术的发展概况,就在我国推广应用问题进行了讨论,主要分析了应用的迫切性、局限性和可行性以及发展前景。%This article mainly introduces the development situation of asphalt recycling technology, discusses the popu-larization problems in China and mainly analyzes the ap-plication urgency, limitations, feasibility and development pro-spect.

  8. OGFC在沥青路面养护中的适用性研究%Applicability Research of OGFC in Asphalt Pavement Maintenance

    Institute of Scientific and Technical Information of China (English)

    李宁; 刘伟

    2011-01-01

    对江苏省S336省道海门段、宁高高速、南京绕城高速、沿江高速4条OGFC路段的路面使用状况、排水性能衰减情况、抗滑性能衰减情况和噪声进行检测和分析,对采用不同设计思路和胶结料类型的OGFC排水磨耗层的性能进行了综合评估和比较,检测结果表明,OGFC用于表面功能层具有较好的排水、抗滑、降噪效果,为下一步的养护应用提供参考。%By detecting and analyzing the pavement service condition,drainage performance,sliding resistance and pavement noise of four OGFC sections in provincial highway S336 Haimen section,Ninggao expressway,Nanjing expressway circling city and Yanjiang expressway,this paper evaluates and compares the performance of OGFC designed by different methods and different materials.It shows that OGFC can provide excellent drainage performance,sliding resistance and noise reduction performance.Research results could be taken as reference in other maintence cases.

  9. Aging of Asphalt Symposium, September 17th 2014, Delft, the Netherlands

    OpenAIRE

    Erkens, S.M.J.G.; Scarpas, A.; Blab, R.; Glaser, R; Glover, C.; Oeser, M.; Porot, L.; Soenen, H.

    2015-01-01

    Technical specifications for the asphalt concrete properties are developed to be able to specify mixtures that will perform well in pavement applications. Being able to identify and determine properties related to pavement performance in practice is crucial for both road authorities and contractors, since it allows for design and risk management by determining design life times and reliability. However, the properties of Asphalt Concrete (AC) change over its lifetime and since most pavement l...

  10. Self Healing of Asphalt Mixtures: Towards a Better Understanding of the Mechanism

    OpenAIRE

    Qiu, J

    2012-01-01

    Traffic is increasing rapidly in terms of number of vehicles and also in axle loads. In order to maximize the availability of the pavement and to minimize hindrances to traffic because of maintenance works, long life pavements are needed. An asphalt pavement with self repairing capabilities is believed to be very useful to this respect. The self healing phenomenon of asphalt mixtures is known for many years by road engineers. Bituminous materials are expected to repair themselves during hot s...

  11. Laboratory and Field Evaluation of In-Place Asphalt Recycling Technologies for Small Airfield Repair

    Science.gov (United States)

    2013-06-01

    Recommendation of materials, equipment and process for in-place asphalt recycling Part I Laboratory Evaluation RAP Material Characterization • Binder...laboratory testing based upon their chemical properties and costs. Reclaimed asphalt pavement ( RAP ) material was obtained from both test sites for...Part I of this study was to conduct laboratory testing to:  characterize the reclaimed asphalt pavement ( RAP ) from the test sites,  evaluate how

  12. Self Healing of Asphalt Mixtures: Towards a Better Understanding of the Mechanism

    NARCIS (Netherlands)

    Qiu, J.

    2012-01-01

    Traffic is increasing rapidly in terms of number of vehicles and also in axle loads. In order to maximize the availability of the pavement and to minimize hindrances to traffic because of maintenance works, long life pavements are needed. An asphalt pavement with self repairing capabilities is belie

  13. On the representative volume element of asphalt concrete at low temperature

    Science.gov (United States)

    Marasteanu, Mihai; Cannone Falchetto, Augusto; Velasquez, Raul; Le, Jia-Liang

    2016-08-01

    The feasibility of characterizing asphalt mixtures' rheological and failure properties at low temperatures by means of the Bending Beam Rheometer (BBR) is investigated in this paper. The main issue is the use of thin beams of asphalt mixture in experimental procedures that may not capture the true behavior of the material used to construct an asphalt pavement.

  14. THE FATIGUE DURABILITY OF THE MODIFIED ASPHALT CONCRETE UNDER THE EFFECT OF INTENSIVE TRAFFIC LOADS

    Directory of Open Access Journals (Sweden)

    Yuri KALGIN

    2016-06-01

    Full Text Available The problem of prediction of the service life of asphalt concrete surface constructed with modified asphalt concrete application onto a traffic lane is examined. Asphalt concrete behaviour in road surface under the traffic loads was analysed. There were shown The results of experiments and their mathematical analysis of the assessment of standard and modified cold asphalt concrete fatigue life on road surface were shown. The service life of an asphalt concrete surface covered with standard and modified cold asphalt concrete is examined. The prediction has been received with an account of stress relaxation processes in asphalt concrete pavement and unevenness of traffic load application.

  15. Marginal Aggregates in Flexible Pavements: Background Survey and Experimental Plan

    Science.gov (United States)

    1994-08-01

    cement, bitumen , and water has been marketed in France under the trade name Stabicol 71 , but it is not yet available in the U.S. This composite...in a pavement base course. Geotextile reinforcement and a new portland cement- bitumen emulsion have considerable potential to upgrade substandard...modifiers with SBS , polyethylene. 30 b) Hard Asphalt Cement - AC 40 asphalt cement. c) Large Stone Asphalt Mixtures - Increase maximum aggregate size. e

  16. Application of On-site Cold Recycling Technology for Old Asphalt Pavement in Rural Road Reconstruction%旧沥青路面就地冷再生技术在农村公路改造中的应用

    Institute of Scientific and Technical Information of China (English)

    李永睿

    2016-01-01

    Method of excavation and reconstruction is generally used in the traditional rural asphalt road reconstruction, which is the full negation of the original road, because it needs excavation of the old road structure and also transportation of the old road waste with arrangement; it is not only time-consuming but also needs occupy land. Cold recycling technology can make full use of the old road resources to recycle the old pavement and grassroots. As long as key technology and process flow are controlled well, it can form a stable base of pavement and at the same time, make the old road materials be fully utilized to achieve energy-saving, expense-saving, environmental protection and significant economic and social benefits. Therefore, cold in-place recycling technology in old road repair or reconstruction project has a good application prospect.%传统农村沥青公路改造一般采用挖除重建的方法,这种改造方法是对原路的完全否定,既要挖除旧路结构层,又要把旧路废料运走,安排堆放地;既费时费工又要占用土地。冷再生技术可以充分利用旧路资源对旧路路面及基层进行再生利用,只要掌控好技术要点和工艺流程,即能形成稳定的路面基层,同时,使旧路残余材料得到充分利用,实现节能、节支、环保,经济效益和社会效益显著,因此,就地冷再生技术在旧路大修或改建工程中有很好的应用前景。

  17. Analysis on Mechanical Response for Three Kinds of Asphalt Pavement Under Discontinuous Interlayer Condition%半刚性路面结构层模量梯度控制与论证

    Institute of Scientific and Technical Information of China (English)

    张艳红; 王晓帆

    2013-01-01

    为了从理论上进一步验证结构层模量梯度控制的必要性,以对受力影响最为显著的基面层模量比为切入点,选取层间不完全连续接触,利用壳牌路面设计软件Bisar 3.0全面计算基面层模量比变化时半刚性路面的力学响应,将模量比的影响定量化.结果表明:基面层模量比从1增大到3.5时,沥青层最大拉应变与结构最大弯拉应力均呈先减后增趋势,同时面层剪应力随之增大;基面层刚度差异过大导致上基层层底拉应力骤增;规范推荐基面层模量比1.5~3较合理,可保证路面受力均衡.%In order to further verify the necessity of modulus gradient-controlling of structural layers,the paper chose modulus ratio between base and surface affecting stress distribution of structure most obviously as entrance point,set interlayer binding condition as not fully continuous and then comprehensively calculated the mechanical responses of semi-rigid pavement with modulus ratio between base and surface changing by shell designing software Bisar3.0,so the effect of modulus ratio was quantified.The results showed that when modulus ratio between base and surface changed from 1to 3.5,maximum flexible strain of asphalt layer and maximum flexible stress of structure both showed the trend of first decreasing then increasing,at the same time shear stress of surface increased; great difference between base and surface made flexible stress on the bottom of up-base suddenly raise; modulus ratio between base and surface of 1.5 to 3 recommended by standard was reasonable to ensure the stress balance of pavement.

  18. Crack repair of asphalt concrete with induction energy

    NARCIS (Netherlands)

    García, A.; Schlangen, E.; Ven, M. van de; Vliet, D. van

    2011-01-01

    It is well known that the healing rates of asphalt courses increase with the temperature. A new method, induction heating, is used in this paper to increase the lifetime of asphalt concrete pavements. Mastic will be first made electrically conductive by the addition of conductive fibers. Then it wil

  19. Crack repair of asphalt concrete with induction energy

    NARCIS (Netherlands)

    García, A.; Schlangen, E.; Van de Ven, M.; Van Vliet, D.

    It is well known that the healing rates of asphalt courses increase with the temperature. A new method, induction heating, is used in this paper to increase the lifetime of asphalt concrete pavements. Mastic will be first made electrically conductive by the addition of conductive fibers. Then it wil

  20. Characterization of Failure and Permanent Deformation Behaviour of Asphalt Concrete

    NARCIS (Netherlands)

    Wang, J.G.

    2015-01-01

    Asphalt concrete is a viscoelastic material consisting of aggregates, filler and bitumen. The response of asphalt concrete is highly dependent on temperature, loading rate and confining pressure. Permanent deformation is one of the most important distresses developing during the flexible pavement se

  1. Laboratory and Field Asphalt Fatigue Performance, Matching Theory with Practice

    NARCIS (Netherlands)

    Pramesti, F.P.

    2015-01-01

    This thesis investigates the relationship between predicted and observed fatigue life of asphalt. This study also investigates the positive effects of modifying bitumen with Retona, a bitumen modifier produced in Indonesia from natural asphalt rock sources, on pavement performance in terms of increa

  2. Asbestos Tailings as Aggregates for Asphalt Mixture

    Institute of Scientific and Technical Information of China (English)

    LIU Xinoming; XU Linrong

    2011-01-01

    To use many asbestos tailings collected in Ya-Lu highway, and to explore the feasibility of using asbestos tailings as aggregates in common asphalt mixtures, and properties of some asphalt mixtures were evaluated as well. X-ray diffraction (XRD), X-ray fluorescent (XRF), and atomic absorption spectrophotometry (AAS) were employed to determine the solid waste content of copper, zinc, lead, and cadmium. Volume properties and pavement performances of AC-25 asphalt mixture with asbestos tailings were also evaluated compared with those with basalt as aggregates.XRD and XRF measurement results infer that asbestos tailing is an excellent road material. Volume properties of AC-25 asphalt mixture with asbestos tailings satisfied the related specifications. No heavy metals and toxic pollution were detected in AAS test and the value of pH test is 8.23, which is help to the adhesion with asphalt in the asphalt concrete. When compared with basalt, high temperature property and the resistance to low temperature cracking of AC-25 asphalt mixture was improved by using asbestos tailings as aggregates. In-service AC-25 asphalt pavement with asbestos tailings also presented excellent performance and British Pendulum Number (BPN) coefficient of surface.

  3. Research of Some Asphalt Pavement Preventive Maintenance Materials' Performance in High and Cold Area%几种高寒地区道面预养护性材料性能研究

    Institute of Scientific and Technical Information of China (English)

    李炜光; 段炎红; 颜录科; 吕振北; 韩之栋; 荣丽娟; 经冠举

    2012-01-01

    This project studied an anti-light aging fog seal coat materials under the Qinghai-Tibet Plateau special environmental conditions via adding the modifier in it. First, the light fastness aging properties of the existing fog seal coat pavement maintenance materials was contrasted. Then a variety of modifiers (curing agent) were chosen to modify the existing solvent asphalt fog seal coat materials, in addition, its light fastness aging properties was researched. Besides, the effects of the curing agent to the test results were studied. Finally,on the base of above research,a kind of resistant to UV aging fog seal coat maintenance materials were prepared,and its anti-aging properties were studied. The experimental results have shown that this fog seal coat maintenance material has a good resistance to UV aging and is suitable for the use of strong ultraviolet region of China's western highlands.%针对青藏高原紫外线辐射强度高、温差大的特点,研究出一种抗光氧老化性能优良的雾封层道面养护材料.首先,比选了现有预养护材料耐光氧老化性能,其次研究了光固化剂种类及掺量对抗光氧老化性能的影响,最终优选出了一种光固化材料,并对其对抗紫外破坏能力进行了测试分析.微观测试结果表明,改性剂的加入,显著扼制了羰基的生成,使其具备较强的抵抗热氧和紫外线老化的能力,适合我国西部高原强紫外线地区使用.

  4. Water Damage Study on Cold In-place Recycling of Asphalt Pavement%沥青路面就地冷再生工程的水损坏研究

    Institute of Scientific and Technical Information of China (English)

    曹林涛; 张郭峻; 黄菊; 叶玮

    2011-01-01

    伴随资源节约型社会的建设,沥青路面就地冷再生技术推广迅速,水损坏是主要损坏形式之一.通过工程调研,把冷再生工程的水损坏类型归纳为基层坑槽、面层翻浆或唧泥和面层反射车辙.通过损坏路段的开挖与取芯试验,研究了不同类型的损坏原因.结果表明排水不良促进了这些损坏的发生.指出路侧排水边沟开挖,基层结构内部盲沟设置是解决道路排水不良问题的关键措施.%With the construction of resource-saving society, cold in-place recycling technology of asphalt pavement is promoted rapidly. Water damage is one of the main damage types. Through investigation of cold in-place recycling projects, water damage types are summarized into three types, including pit slot,boiling and reflective rutting. Through excavation and coring tests at damage place, reasons for different damage types are studied. Results show that poor drainage promotes these damage events. It is pointed out that the drainage ditch excavation on the road side and the setting of blind drain in base structure are key measures for solving poor drainage.

  5. Polymer Blends Modified Asphalt

    Institute of Scientific and Technical Information of China (English)

    WANG; YunPu

    2001-01-01

    Asphalt is an important low-cost thermo-plastic material which is widely used for construction, in particular as road-paving. Therefore it is exposed to a wide range of load and weather conditions. Increasing traffic factors, such as heavier loads, higher traffic volume and higher tire pressure demand higher performance pavements. However, this kind of materials does not have good mechanical properties because it is hard and brittle in cold weather, and soft and fluid in a hot environment.  ……

  6. 基于动态参数的新型半刚性沥青混凝土路面结构力学分析%Mechanical Analysis on the New Type of Semi-Rigid Asphalt Pavement Structure Based on Dynamic Parameters

    Institute of Scientific and Technical Information of China (English)

    陈团结; 刘宁

    2013-01-01

    In order to study the dynamic response of the new type of semi-rigid asphalt pavement structure under different speed and continuous variable speed of vehicle,the 3D finite element model is built by ABAQUS based on the elastic layered system theory,the dynamic modulus parameters of pavement materials are utilized,and the subroutine UTRACLOAD and DSLOAD are compiled.In addition,mechanical responses of pavement structure calculated by static parameters are compared.And difference of mechanical performance indexes between new semi-rigid and the traditional pavement structure are also analysed.The results show that the vehicle speed has few effects on dynamic responses of pavement structure.Compared to the calculations by static modulus,strain of semi-rigid base layer is reduced and shear stress of asphalt surface course is increased when dynamic modulus is used.Furthermore,the new type of semi-rigid pavement structure can effectively reduce the rutting probability of intersections and improve its resistance to permanent deformation.%基于弹性层状体系理论,借助大型有限元软件ABAQUS建立了新型半刚性路面结构三维有限元模型,引入铺面材料动态模量参数,并编写了UTRACLOAD和DLOAD用户子程序,研究不同车速以及连续变速下的路面结构动力响应,与基于静态参数的路面结构力学响应进行了对比;并分析了特定车速下新型半刚性路面结构与传统路面结构各力学性能指标的差异.结果表明;车速对路面结构各动力响应值的影响较小;车辆在连续变速时,路面结构上中面层受到了更为不利的剪应力作用;相比于静态模量,采用动态模量分析的半刚性基层层底拉应变减小,而沥青混凝土上面层剪应力水平增加;新型半剐性路面结构能有效降低交叉口路段车辙情况发生的几率,提高其抗永久变形能力.

  7. Long-term stormwater quantity and quality performance of permeable pavement systems.

    Science.gov (United States)

    Brattebo, Benjamin O; Booth, Derek B

    2003-11-01

    This study examined the long-term effectiveness of permeable pavement as an alternative to traditional impervious asphalt pavement in a parking area. Four commercially available permeable pavement systems were evaluated after 6 years of daily parking usage for structural durability, ability to infiltrate precipitation, and impacts on infiltrate water quality. All four permeable pavement systems showed no major signs of wear. Virtually all rainwater infiltrated through the permeable pavements, with almost no surface runoff. The infiltrated water had significantly lower levels of copper and zinc than the direct surface runoff from the asphalt area. Motor oil was detected in 89% of samples from the asphalt runoff but not in any water sample infiltrated through the permeable pavement. Neither lead nor diesel fuel were detected in any sample. Infiltrate measured 5 years earlier displayed significantly higher concentrations of zinc and significantly lower concentrations of copper and lead.

  8. "Full-Scale Testing of Pavement Response"

    DEFF Research Database (Denmark)

    Ullidtz, Per; Ekdahl, Peter

    1998-01-01

    Three pavement sections in southern Sweden were instrumented in late 1991. Each section have instruments for measuring the strain at the bottom of the asphalt layer, vertical stress and strains in the subgrade and temperatures at different depths. The purpose was to evaluate different theoretical...

  9. Study on triaxial test method and failure criterion of asphalt mixture

    Directory of Open Access Journals (Sweden)

    Jianlong Zheng

    2015-04-01

    Full Text Available Asphalt mixture is the most widely used pavement material all over the world. In China, more than 90% of service expressways are asphalt pavement. However, current asphalt pavement design method still has irrationality. Even though maximum tensile stress theory is used as failure criterion, pavement structure under the effects of wheel load is in three-dimensional complex stress state. Obviously, one-dimensional strength theory cannot reflect the failure characteristics and the resistance of pavement structure. So it is necessary to study the failure criterion of asphalt mixture under three-dimensional complex stress state. Due to limitations of test equipment, there are almost no studies in related area. Under this background, this paper develops a new triaxial test method, according to the investigation of strength characteristics of asphalt mixture under complex stress state through plane isobaric/axial tensile test, plane isobaric/axial compression test, plane tensile and compression/axial tensile test, to reveal the general rules of asphalt mixture's strength failure. The failure mode is divided into three types: tensile failure, shear failure and rheological failure. The tensile meridian and compression meridian in the stress space and strength envelope in the π plane where hydrostatic pressure is greater than zero are obtained, and the failure criterion of asphalt mixture under complex stress state is established, providing theoretical method and scientific basis for structure design as well as strength check of asphalt pavement under three-dimensional stress state.

  10. Application of Common Mid-Point Method to Estimate Asphalt

    Science.gov (United States)

    Zhao, Shan; Al-Aadi, Imad

    2015-04-01

    3-D radar is a multi-array stepped-frequency ground penetration radar (GPR) that can measure at a very close sampling interval in both in-line and cross-line directions. Constructing asphalt layers in accordance with specified thicknesses is crucial for pavement structure capacity and pavement performance. Common mid-point method (CMP) is a multi-offset measurement method that can improve the accuracy of the asphalt layer thickness estimation. In this study, the viability of using 3-D radar to predict asphalt concrete pavement thickness with an extended CMP method was investigated. GPR signals were collected on asphalt pavements with various thicknesses. Time domain resolution of the 3-D radar was improved by applying zero-padding technique in the frequency domain. The performance of the 3-D radar was then compared to that of the air-coupled horn antenna. The study concluded that 3-D radar can be used to predict asphalt layer thickness using CMP method accurately when the layer thickness is larger than 0.13m. The lack of time domain resolution of 3-D radar can be solved by frequency zero-padding. Keywords: asphalt pavement thickness, 3-D Radar, stepped-frequency, common mid-point method, zero padding.

  11. Investigating the Properties of Asphalt Concrete Containing Glass Fibers and Nanoclay

    OpenAIRE

    Hasan Taherkhani

    2016-01-01

    The performance of asphaltic pavements during their service life is highly dependent on the mechanical properties of the asphaltic layers. Therefore, in order to extend their service life, scientists and engineers are constantly trying to improve the mechanical properties of the asphaltic mixtures. One common method of improving the performance of asphaltic mixtures is using different types of additives. This research investigated the effects of reinforcement by randomly distributed glass fib...

  12. Field Test and Numerical Simulation of Dynamic Response of Semi-rigid Base Asphalt Pavement under Moving Vehicle Load%动载作用下半刚性基层沥青路面动力响应现场测试及数值模拟

    Institute of Scientific and Technical Information of China (English)

    张静; 魏连雨; 马士宾; 王涛

    2016-01-01

    Relying on the real project, the dynamic response of semi-rigid base asphalt pavement under moving vehicle load is studied based on the field test and 3D finite element simulation. First, the field test of the dynamic response of semi-rigid base asphalt pavement is conducted using fiber grating sensing technology. The dynamic theory, the moving vehicle load condition, the boundary condition and the structural parameters for the FE transient analysis are determined according to the field test result, and a 3D finite element model of the asphalt pavement is established. Then, the internal dynamic response feature of the pavement under different axle loads and material parameters are analysed. The result indicates that (1) under moving vehicle load, the stress state of the pavement tends to adverse with the decreasing of vehicle speed; ( 2 ) the longitudinal (the same as the driving direction) tensile strain is greater than the transverse tensile strain;(3) as the load increases, the volatility of strain response of the pavement is enhanced, and the tensile and compressive strains in the asphalt layer change alternately and dramatically;(4) the effect of surface modulus on the compressive strain on the top of subgrade is more significant than the base modulus, but the base modulus has a great impact on tensile strain at the bottom of surface.%依托实际工程,基于现场检测和三维有限元模拟技术,研究动载作用下半刚性基层沥青路面动力响应.首先,基于光纤光栅传感技术进行半刚性基层沥青路面动力响应现场测试,依据现场测试结果,确定有限元瞬态分析的动力学原理、 荷载条件、 边界条件及材料参数,建立沥青路面三维有限元模型;然后分析不同轴载及材料参数下路面结构内部的动力响应特征.结果表明,动载作用下,车速越低,路面结构受力状态越不利;纵向(行车方向)拉应变大于横向拉应变;随轴载的增大,路面结构的应变响

  13. Investigation of modified asphalt concrete

    Science.gov (United States)

    Zimich, Vita

    2016-01-01

    Currently the problem of improving the asphalt quality is very urgent. It is used primarily as topcoats exposed to the greatest relative to the other layers of the road, dynamic load - impact and shear. The number of cars on the road, the speed of their movement, as well as the traffic intensity increase day by day. We have to upgrade motor roads, which entails a huge cost. World experience shows that the issue is urgent not only in Russia, but also in many countries in Europe, USA and Asia. Thus, the subject of research is the resistance of asphalt concrete to water and its influence on the strength of the material at different temperatures, and resistance of pavement to deformation. It is appropriate to search for new modifiers for asphaltic binder and mineral additives for asphalt mix to form in complex the skeleton of the future asphalt concrete, resistant to atmospheric condensation, soil characteristics of the road construction area, as well as the growing road transport load. The important task of the work is searching special modifying additives for bitumen binder and asphalt mixture as a whole, which will improve the quality of highways, increasing the period between repairs. The methods described in the normative-technical documentation were used for the research. The conducted research allowed reducing the frequency of road maintenance for 7 years, increasing it from 17 to 25 years.

  14. The Preventive Maintenance of Tonghua Highway Asphalt Pavement%通化地区沥青路面预养护浅谈

    Institute of Scientific and Technical Information of China (English)

    马长志

    2013-01-01

      Through the investigation and analysis of pavement structure use in Tonghua highway maintenance, this article found out the advantages of taking preventive maintenance in seasonal frost region, and analyzed the method of road preventive maintenance and the matters that should be paid attention to. Tonghua area is located in the north temperate zone continental monsoon climate zone, where four seasons climate changes clearly. Winter reaches a length of five months, and the climate is cold and dry. Summer is hot and short. The highest temperature is 36.1℃, and the minimum is -38.7℃, the longest freeze-up is 183 days, the maximum depth of frozen ground is 1.5 meters, the deepest snow thickness is 52 cm, and the maximum precipitation is 1130.6 mm. Because of the large temperature difference, it caused great effect on using quality and conditions of highway, and produced a variety of diseases.%  本文通过在通化地区公路养护过程中对路面结构使用的调查分析,找出对季冻区路面采取预养护的优势,并针对路面预养护方法和应该注意的事项做出分析。通化地区地处北温带大陆性季风气候区,四季气候变化分明。冬季长达5个月,严寒而干燥,夏季炎热而短促。历年最高气温36.1益,最低气温-38.7益,历年最长冰冻期183天,最大冻土深度1.5米,最大积雪厚度52厘米,最大降水量1130.6毫升。由于温差大,对公路使用质量和使用状况造成了非常大的影响,产生多种病害。

  15. Environmentally friendly pavements: Results from noise measurements 2005-2008

    OpenAIRE

    Berge, Truls Svenn; Haukland, Frode; Ustad, Asbjørn

    2009-01-01

    CPX-measurements (tyre A) have been performed on a wide range of ordinary dense Norwegian road pavements and special test pavements, as part of the R&D project “Environmental friendly pavements” initiated by the Norwegian Public Roads Administration. The following conclusions can be made from the investigation:- New dense asphalt concrete pavements can give a tyre/road noise level (CPX) of 4-8 dB(A) lower noise level, compared to a chosen reference level for a pavement of type AC 0/11 and SMA...

  16. Microstructural Analysis and Rheological Modeling of Asphalt Mixtures Containing Recycled Asphalt Materials

    Directory of Open Access Journals (Sweden)

    Augusto Cannone Falchetto

    2014-09-01

    Full Text Available The use of recycled materials in pavement construction has seen, over the years, a significant increase closely associated with substantial economic and environmental benefits. During the past decades, many transportation agencies have evaluated the effect of adding Reclaimed Asphalt Pavement (RAP, and, more recently, Recycled Asphalt Shingles (RAS on the performance of asphalt pavement, while limits were proposed on the amount of recycled materials which can be used. In this paper, the effect of adding RAP and RAS on the microstructural and low temperature properties of asphalt mixtures is investigated using digital image processing (DIP and modeling of rheological data obtained with the Bending Beam Rheometer (BBR. Detailed information on the internal microstructure of asphalt mixtures is acquired based on digital images of small beam specimens and numerical estimations of spatial correlation functions. It is found that RAP increases the autocorrelation length (ACL of the spatial distribution of aggregates, asphalt mastic and air voids phases, while an opposite trend is observed when RAS is included. Analogical and semi empirical models are used to back-calculate binder creep stiffness from mixture experimental data. Differences between back-calculated results and experimental data suggest limited or partial blending between new and aged binder.

  17. Research on Functional Repairing Material for Asphalt Pavement to Resist Condensate Ice Damage%沥青路面抗凝冰损伤功能性修复材料试验研究

    Institute of Scientific and Technical Information of China (English)

    陈瑶; 单丽岩; 谭忆秋; 陈志国

    2013-01-01

    针对冬季云、贵高原地区路面凝冰对表层沥青混合料造成的微损伤,研发高黏结力、高渗透性沥青路面抗凝冰损伤功能性修复材料,以防治沥青路面表层细集料剥落及麻面现象的产生.研究了SBR改性剂及G助剂对该修复材料常规物理性能、渗透性能及黏附性能的影响.结果表明:与SBR复配改性后,G助剂可使沥青路面抗凝冰损伤功能性修复材料的渗透性能显著提升,对路表构造深度影响小,有助于提高原位修复效果,而且对该修复材料蒸发残留物弹性恢复性能具有促进作用,但对其5℃延度有不利影响;随固化时间的延长,沥青路面抗凝冰损伤功能性修复材料对湿轮磨耗试件表面细集料的黏附效果优异,其抗水及抗冻融性能较未修复或喷洒普通乳化沥青试件显著提高.%As to the microscopic damage of asphalt mixture road surface caused by winter freezing in the Yunnan-Guizhou plateau region,the research on functional repair of asphalt pavement was carried out by developing adhesive and permeable materials in order to prevent fine aggregate from stripping and pitting.With SBR and G additive as modifiers,the study was focused on the changes of repairing materials in terms of physical properties,permeability and adhesion to different modifier.The results show that the permeability of repairing materials enhances rapidly with the increase of G additive,which does not have much effect on skid resistance of the original road surface,therefore,the remediation effect is enhanced.The evaporation residue has better elastic recovery,but the 5 ℃ ductility is adversely affected.With increasing curing time,better performances in adhesion,water resistance and freeze-thaw resistance are obtained compared with samples without repairing materials added.This study is of significance in developing the preventive maintenance technology in areas with local characteristics.

  18. Initiation and Propagation Mechanism of Blisters on the Epoxy Asphalt Concrete Paving Course of Steel Deck Bridge Pavement%钢桥面环氧沥青铺装层鼓泡形成扩展机理

    Institute of Scientific and Technical Information of China (English)

    张华; 郝培文; 张海伟

    2016-01-01

    In order to take effective steps to minimize the blistering problems on the epoxy asphalt overlays, the cause and propagation mechanism for blisters were studied systematically by means of field investigation, theoretical analysis and mathematical modeling. Based on the theory of thin plate and fracture mechanics,the deflection of blisters was studied under the pressure. Additionally, the energy principle in fracture mechanics was used to derive the energy relationship and the initiation and propagation mechanism was studied. The results indicate that the development of blisters includes three stages, namely, initiation, stale and unstable propagation. The deflection of blisters produced by the external force was related to the radius of blisters, depth and modulus of elasticity of pavement. The energy release rate was proposed as a criterion of the initiation and propagation of blisters. It provides the theory basis for further model experiment and simulation analysis.%为有效减少钢桥面环氧沥青铺装层出现鼓泡现象,采用现场调查、理论分析和数学建模的研究方法,系统地研究了鼓泡产生的原因和形成扩展机理。基于薄板理论,研究了鼓泡在竖向均布荷载作用下鼓泡挠度的变化规律。根据断裂力学中的能量原理,得到了鼓泡形成扩展过程中的能量关系,进而阐明了鼓泡形成扩展机理。研究结果表明:钢桥面环氧沥青铺装层鼓泡的形成扩展过程分为起裂、稳定扩展和失稳扩展3个阶段;鼓泡在外力作用下产生的挠度与鼓泡半径、铺装层厚度和弹性模量等因素有关,提出了以能量释放率为判定参数的扩展准则。

  19. Experiments of mix design and pavement performance for special basalt fiber reinforced asphalt mixture OGFC-13%特种玄武岩纤维增强OGFC-13混合料配合比设计及路用性能试验

    Institute of Scientific and Technical Information of China (English)

    2016-01-01

    In order to improve the stability and deformation resistance capacity of permeable open-graded friction course(OGFC)asphalt mixture,a kind of flocculent special basalt fiber with good performance is used as a reinforced stabilizer.By selecting different mixing a-mounts of the basalt fiber,the mixture ratios of OGFC-13 were designed,then various pavement performances of the OGFC-13 mixtures under the optimum asphalt aggregate ratios were tested.The results show that the special basalt fiber can adsorb asphalt very well to bond the coarse aggregate skeleton into a firm whole,then all the pavement per-formances of basalt fiber reinforced OGFC-13 including high temperature,low tempera-ture and water stability etc.are obviously improved.However,when the mixing amount of basalt fiber is too high,a part of basalt fiber reinforced asphalt mortar distributes in the connected voids of OGFC-13 to cause the reduction of void ratio,and a few basalt fiber with uneven dispersion is easy to form the weak points in the mixture structure,influencing the mixture pavement performances.Therefore,the suitable range of mixing amount of the special basalt fiber is determined as 0.3%~0.5%,and the optimum mixing amount is 0.4%.The results could provide references for the engineering application of permeable as-phalt pavement with noise reduction.%为了提高开级配排水式磨耗层OGFC沥青混合料的稳定性和抗变形能力,采用一种絮状且性能优良的特种玄武岩纤维作为增强稳定剂.通过选取不同岩纤维掺量,分别进行了OGFC-13混合料的配合比设计及最佳油石比下的各项路用性能检验.研究结果表明,特种玄武岩纤维能很好地吸附沥青并将粗集料骨架粘结成牢固的整体,使得岩纤维增强OGFC-13的高温、低温和水稳等路用性能均得到明显的提高.然而,当岩纤维掺量过高时,部分岩纤维增强沥青胶浆因分散于OGFC-13的连通空隙中而造成空隙率降低,且少量分散不

  20. Development of Mechanistic-Empirical Pavement Design for Tropical Climate Using Cement-Treated Base Layer

    OpenAIRE

    Aderinola, O.S

    2016-01-01

    A mechanistic-empirical pavement design method is developed characterising cement-treated base layers for pavement design in Nigeria or other similar tropical and subtropical countries. Asphalt Concrete surface, Subbase and Aggregate base were characterised based on back calculation data from Claros et al (1986) while cement-treated base layer was based on modulus tests that had been conducted by past researchers. Failure criteria for the Asphalt Concrete fatigue failure and the s...

  1. Rheological Evaluation of Polymer Modiifed Asphalt Binders

    Institute of Scientific and Technical Information of China (English)

    WANG Lan; CHANG Chunqing

    2015-01-01

    The microstructure and dynamic rheological characteristics of asphalt containing different polymer modifiers (crumb rubber, styrene-butadiene-styrene and crumb rubber mix with styrene-butadiene-styrene) at mid and high service temperature levels were investigated by using scanning electron microscopy(SEM), dynamic shear rheometer(DSR) and repeat creep test. The main objective of the investigation was to rank the modifiers based on their effect on performance characteristics of asphalt under service conditions. To evaluate the effect of different modiifers on the viscoelastic response of asphalt, the temperature and frequency dependences of the dynamic viscoelastic properties were compared. The mid-temperature fatigue resistance and high-temperature rutting resistance of three polymer modiifed asphalts were evaluated to predict their ifeld performance in roads. Based on the current results, an improved rutting factor was proposed to determine the rutting resistance of asphalt pavements. In addition, the viscous stiffness (Gv), deifned as the reciprocal of viscous compliance, was used to evaluate the high-temperature deformation resistance of asphalt mixtures. The experimental results indicate that the asphalt containing crumb rubber only shows superior performance at mid and high service temperatures in all three modiifed asphalt binders due to the action of the crumb rubber.

  2. Dynamic Response Analysis of Asphalt Concrete Pavement with Permeable Base Considering Moving and Overload Effect of Vehicles%考虑车辆移动效应和超载的排水基层路面结构动力分析

    Institute of Scientific and Technical Information of China (English)

    欧金秋; 崔新壮; 王聪; 郑骁

    2011-01-01

    In order to study the dynamic response of asphalt concrete pavement with permeable base under vehicle loads, based fast Lagrangian finite difference method, the dynamic analysis of asphalt concrete pavement under various conditions is conducted, considering the influence of moving vehicle load and different speed. The results show that the pavement dynamic deflection did not increase though the modulus of permeable base is low. The permeable base reduced the dynamic stress at the bottom of the subbase, which can inhibit the cracking of reflection. With the increase of speed, both the dynamic deflection and stress decreased, so in high temperature season, low-speed vehicle can cause larger rutting. Little vehicle overload can induce larger dynamic deflection and stress thus causes larger pavement deformation even plastic damage and the cracking. It is implied that the governance of overload is of great significance for extending road life and reducing maintenance costs.%为了研究车辆荷载作用下排水基层路面的动力响应,同时考虑车速和轴载的影响,采用移动加载的方法,对不同工况下沥青混凝土路面进行了快速Lagrange有限差分分析.结果表明,路面弯沉并未因排水基层的低模量而增大,峰值甚至有所减小;排水基层的存在减小了底基层底部的动应力,可以抑制反射裂缝的产生;弯沉及动应力均随车速的增大而减小,高温季节,低速行驶更容易引起大车辙;当车辆超载50%时,弯沉和动应力均成倍增大,导致路面产生较大变形甚至塑性破坏,且更容易引起路面开裂,表明治理超载对延长道路使用寿命、降低养护成本具有重要意义.

  3. A STUDY OF FATIGUE LIFE OF ASPHALT CONCRETE BASED ON SHUNGITE MINERAL POWDER

    OpenAIRE

    D. I. Chernousov; Vl. P. Podolsky; E. V. Trufanov; B. A. Bondarev

    2011-01-01

    Problem statement. Shortage of mineral powder stimulates seeking of new materials and technologiesby which traditional ones can be replaced without deterioration of their operating properties. Thatis why a study of mineral powder from shungite and development of new technologies of arrangementof high quality and durable asphalt concrete pavement based on shungite is an actual problem.Results. Bearing capacity and service life of asphalt concrete pavement is most completely characterizedby mod...

  4. Application of Cold In-place Recycling Technology of Cement Stabilized Old Asphalt Pavement to Highway%旧沥青路面水泥稳定就地冷再生技术在公路大修工程中的应用

    Institute of Scientific and Technical Information of China (English)

    黄河; 李乾辉; 阮伟; 徐长波; 王燕

    2014-01-01

    结合襄阳市2010年国省干线公路大修工程实践,对旧沥青路面水泥稳定就地冷再生技术方案选定、设计方法、设计参数选用等进行分析探讨,并对施工控制过程进行介绍。%Combining the overhaul engineering for national and provincial trunk highway of XiangY-ang city in 2010,the paper explored the scheme choosing,design method,choice of the design param-eters,construction control of the cold in-place cycling technology of cement stabilized old asphalt pavement.

  5. 龚家坝隧道温拌沥青混合料路面施工技术%Construction Technology of Warm- mix Asphalt Mixture Pavement in Gongjiaba Tunnel

    Institute of Scientific and Technical Information of China (English)

    李明杰

    2012-01-01

    Through construction on warm - mix asphalt in Gongjiaba tunnel and from the aspects of warm - mix asphalt concrete mixing, paving, compaction by rolling, detection and so on, construction advantages and characters of warm -mix asphalt concrete are introduced.%通过对龚家坝隧道温拌沥青施工,从温拌沥青混凝土拌和、摊铺、碾压、检测等方面,介绍了温拌沥青混凝土的施工优势和特点。

  6. Field environmental evaluation plan for sulfur use in pavements

    Science.gov (United States)

    Saylak, D.; Deuel, L. E.; Izatt, J. O.; Jacobs, C.; Zahray, R.; Ham, S.

    1982-07-01

    The use of sulfur in highway paving mixtures is discussed. The evaluation procedures deal with the safety and environmental aspects of storage and handling, formulation, construction, operation and maintenance of highway pavements containing sulfur, including the possible generation of noxious and abnoxious fumes, dust and gases. Methods and equipment for monitoring potential emissions and pollutants are recommended and safety practices for the handling of sulfur and sulfur-modified asphalt mixtures and pavements are discussed.

  7. Quantifying Evaporation and Evaluating Runoff Estimation Methods in a Permeable Pavement System

    Science.gov (United States)

    The U.S. Environmental Protection Agency constructed a 0.4-ha parking lot in Edison, New Jersey, that incorporated permeable pavement in the parking lanes which were designed to receive run-on from the impervious hot-mix asphalt driving lanes. Twelve lined permeable pavement sec...

  8. Unified Methodology for Airport Pavement Analysis and Design. Volume 1. State of the Art

    Science.gov (United States)

    1991-06-01

    pavements with saturated bases and subgrades to well- drained pavements. The damage factors ranged from 10 to 70,000. Cedergren also demonstrated that...34Modulus of Asphalt Mixtures - An Unresolved Dilemma," Transportation Research Board, Research Record 1171, p. 193, Washington, DC 13. Cedergren , H.R

  9. Viscoelastic Analysis of Asphalt Mixture Based on Creep Test

    Directory of Open Access Journals (Sweden)

    Lihua Zhao

    2013-01-01

    Full Text Available Two kinds of mineral fibers were added to AC-16C asphalt mixture. Trabecular bending creep experiments of asphalt mixtures were carried out at -10 and 20°C. The influence of mineral fibers on the low temperature viscoelasticity of asphalt mixtures were analyzed systemically. Furthermore, by using Origin, Burgers viscoelastic model was used to investigate the parameter regression for the creep test results at the different temperatures. The results show that the addition of mineral fibers can effectively improve the bending creep rate of asphalt mixtures, indicates the increase of crack resistance of asphalt mixtures. Good agreement between experimental data and Burgers model was found. The parameters of Burgers model at different temperatures can also provide data support for the viscoelastic design of asphalt pavements.

  10. Thermal Properties of Asphalt Mixtures Modified with Conductive Fillers

    Directory of Open Access Journals (Sweden)

    Byong Chol Bai

    2015-01-01

    Full Text Available This paper investigates the thermal properties of asphalt mixtures modified with conductive fillers used for snow melting and solar harvesting pavements. Two different mixing processes were adopted to mold asphalt mixtures, dry- and wet-mixing, and two conductive fillers were used in this study, graphite and carbon black. The thermal conductivity was compared to investigate the effects of asphalt mixture preparing methods, the quantity, and the distribution of conductive filler on thermal properties. The combination of conductive filler with carbon fiber in asphalt mixture was evaluated. Also, rheological properties of modified asphalt binders with conductive fillers were measured using dynamic shear rheometer and bending beam rheometer at grade-specific temperatures. Based on rheological testing, the conductive fillers improve rutting resistance and decrease thermal cracking resistance. Thermal testing indicated that graphite and carbon black improve the thermal properties of asphalt mixes and the combined conductive fillers are more effective than the single filler.

  11. STUDY ON FLOOD CONTROL PROPERTIES OF PERMEABLE PAVEMENT USING SATURATED-UNSATURATED SEEPAGE ANALYSIS

    Science.gov (United States)

    Yano, Takao; Nishiyama, Satoshi; Ohnishi, Yuzo; Nakashima, Shinichiro; Moriishi, Kazushi; Wada, Minoru

    The rainfall storage and infiltration facility of permeable pavement have been attracted attention as a control measure of flood and an environmental improvement measure in urban areas. However, rainfall infiltration of permeable pavement is unsteady flow and strongly dependent on the behavior of unsaturated zones in the pavement. Moreover, the wet condition of subbase course also has a great influence on the rainfall infiltration of the pavement. That's why previous studies have not made clear the precise the facility of permeable pavement as a flood control. In this paper, experimental studies and simulated analyses were performed to measure the overflow from the pavement under various conditions of rainfall intensities and estimate the rainfall infiltration of the pavement using the measurement data and unsaturated infiltration characteristics of porous asphalt materials. It is clear that this study shows the methods to have a quantitative estimation of the rainfall storage and infiltration facility of permeable pavement.

  12. 柔性微波泄漏抑制器结构设计与电磁仿真%Flexible Structural Design and Electromagnetic Simulation of Microwave Leakage Suppressor for Asphalt Pavement

    Institute of Scientific and Technical Information of China (English)

    朱松青; 张志胜; 史泰龙

    2011-01-01

    In order to study the anti-microwave leakage when recycled asphalt pavement is subjected to microwave heating,a flexible structure of the leakage suppressor was designed and applied to the development of microwave engineering vehicle maintenance.Based on the waveguide transmission line theory,a model of microwave leakage suppression was established,and two kinds of microwave leakage suppressor that modular plate and metal wire mesh were researched and designed and the equivalent circuits of two suppressors were received.The attenuation model of metal comb plate was set up,and the relationship models between wire-to-wire spacing of the metal mesh or multi-layer wire mesh interconnection distance and shielding effectiveness were built respectively,and the shielding effectiveness of them was calculated.The results show that,combined plate-type for microwave leakage suppressor,when comb-shaped plate distance is 12 mm,height of comb-shaped plate is 30.5 mm,it can achieve better shielding effectiveness.In the other hand,for microwave leakage of metal wire mesh-type suppressor,when using 4-layer metal mesh and the gateway from the last,the theoretical value in the shielding effectiveness of 90 dB or more,a good inhibitory effect is get.Through the analysis and comparison with suppressor of two microwave leakage,wire mesh-type microwave leakage suppressor can adaptive the shape of surface disease,and prevent electromagnetic radiation,can be applied in practical engineering.%为了研究微波加热再生沥青路面时的防微波泄漏问题,设计了一种柔性结构的泄漏抑制器,并应用于微波养护工程车的开发设计.运用波导传输线理论,建立了微波泄漏抑制模型,研究设计了组合式板型和金属丝网型两种微波泄漏抑制器,得到了两种抑制器的等效电路;分别建立了金属梳状板衰减模型和金属丝网的丝距、多层金属丝网的网间距与屏蔽效能的关系模型,计算了各自的屏蔽效能.结

  13. Aging of Asphalt Symposium, September 17th 2014, Delft, the Netherlands

    NARCIS (Netherlands)

    Erkens, S.M.J.G.; Scarpas, A.; Blab, R.; Glaser, R.; Glover, C.; Oeser, M.; Porot, L.; Soenen, H.

    2015-01-01

    Technical specifications for the asphalt concrete properties are developed to be able to specify mixtures that will perform well in pavement applications. Being able to identify and determine properties related to pavement performance in practice is crucial for both road authorities and contractors,

  14. Chemomechanics of Damage Accumulation and Damage-Recovery Healing in Bituminous Asphalt Binders

    NARCIS (Netherlands)

    Pauli, A.T.

    2014-01-01

    As a contribution to the development of mutli-scale multi-physics approaches to modelling pavement performance, the present thesis considers the topic of damage accumulation accompanied by damage recover self-healing of the bituminous asphalt phase of pavement systems. It is found insightful that b

  15. Determining the healing potential of asphalt concrete mixtures--a pragmatic approach

    NARCIS (Netherlands)

    Erkens, S.; Vliet, D. van; Dommelen, A. van; Leegwater, G.A.

    2012-01-01

    Most design methods for pavements use a factor explaining the difference between pavement life predictions from design models and performance in the road [1]. Part of this correction factor is healing, the natural capacity of asphalt concrete to recover in rest periods, which generally are not prese

  16. Research on pavement performance of steel deck epoxy asphalt pouring concrete%钢桥面环氧沥青浇筑式混凝土铺装路用性能研究

    Institute of Scientific and Technical Information of China (English)

    崔晓波; 李超源; 邵强

    2014-01-01

    Through different binder contents flow detection selected suitable binder contents, and identified the suitable mixing time of mixture under the conditions of 10% binder content, the high and low temperature experiment results showed that, the low temperature performance of epoxy asphalt pouring asphalt mixture better than ordinary roller type epoxy asphalt concrete, and its low temperature properties little effect by mixing time, compared with common modified asphalt, epoxy asphalt could significantly improve the high temperature stability of pouring asphalt mixture.%通过不同结合料含量流动性检测选取了适宜的结合料用量,并确定了10%结合料用量条件下混合料适宜的拌和时间,高低温试验结果表明,环氧沥青浇筑式沥青混合料的低温性能优于普通碾压式环氧沥青混凝土,且其低温性能受拌和时间影响不大,与普通改性沥青相比,环氧沥青能够显著改善浇筑式沥青混合料的高温稳定性。

  17. 沥青路面就地热再生技术对旧料利用技术研究%The technology research on asphalt pavement in place hot recycling technology to old material use

    Institute of Scientific and Technical Information of China (English)

    崔亮; 李艳

    2015-01-01

    This paper analyzes the key technologies about the utilization of old asphalt mixture,according to the application of hot-in place recy-cling technology in Guangdong Ji-He Expressway. The main contents include the evaluation of old asphalt mixture,mixture design and the rate of utilization about old asphalt mixture’s affection to the road performance of hot-in place recycling asphalt mixture. The results show that,with the increase of new added asphalt mixture’s proportion,the dynamic stability of hot-in place recycling asphalt mixture decreases,its high temperature stability reduced,but the water stability and low temperature cracking resistance significantly increased.%依托就地热再生在广东机荷高速的应用实例,对旧料利用的关键技术进行了研究,主要包括旧料的性能评价、再生混合料的配合比设计以及旧料利用率对再生料路用性能的影响,研究结果表明,随新料添加比例的增加,再生混合料的动稳定度减小,高温稳定性减弱,而水稳定性和低温抗裂性显著提高。

  18. Morphological Algorithms For The Analysis Of Pavement Structure

    Science.gov (United States)

    Grivas, Dimitri A.; Skolnick, Michael M.

    1989-11-01

    The applicability of morphological image processing techniques for the description of condition and analysis of pavement surfaces is examined. Morphological techniques can be used in the measurement of pavement media consisting of grain (aggregates) and binding substances (bituminous or Portland cement mixtures). Measurements of size and size distributions on surface features related to texture and distresses can be obtained via morphological opening and closing transformations and distributions. When correlated with actual physical measurements of such quantities, the presented morphological measures of size and size distributions may prove to be useful in characterizing the surface condition of both asphalt and concrete pavement structures.

  19. Development of an innovative bio-binder using Asphalt-rubber technology

    OpenAIRE

    2013-01-01

    This research work evaluates several parameters that can affect Asphalt Rubber (AR) binder performance and applies the AR technology to the development of an innovative renewable bio-binder that can fully and cost-effectively replace asphaltic bitumen derived from petroleum in flexible pavement construction. The “Binder Accelerated Separator” method was used to divide the constituents of the Asphalt Rubber and bio-binder (residual binder and swelled rubber). The physical and chemi...

  20. Mechanical Behavior and Failure Mechanism of Recycled Semi-lfexible Pavement Material

    Institute of Scientific and Technical Information of China (English)

    DING Qingjun; ZHAO Mingyu; SHEN Fan; ZHANG Xiaoqiang

    2015-01-01

    The mechanical behavior and failure mechanism of recycled semi-lfexible pavement material were investigated by different scales method. The macroscopic mechanical behavior of samples was studied by static and dynamic splitting tensile tests on mechanics testing system (MTS). The mechanical analysis in micro scale was carried out by material image analysis method and ifnite element analysis system. The strains of recycled semi-lfexible pavement material on samples surface and in each phase materials were obtained. The test results reveal that the performance of recovered asphalt binder was the major determinant on the structural stability of recycled semi-lfexible pavement material. The asphalt binder with high viscoelasticity could delay the initial cracking time and reduce the residual strain under cyclic loading conditions. The failure possibility order of each phase in recycled semi-flexible pavement material was asphalt binder, reclaimed aggregate, cement paste and virgin aggregate.

  1. Pavement structure mechanics response of flexible on semi-flexible overlay that based on the old cement concrete pavement damage

    Directory of Open Access Journals (Sweden)

    Jiang Ruinan

    2015-01-01

    Full Text Available The old cement pavement damage status directly affect the design of the paving renovation. Based on the state of the old road investigation, combined with the research data at home and abroad, use the control index that average deflection, deflection value and CBR value to determine the reasonable time to overlay. Draw up the typical pavement structure according to the principle of combination of old cement pavement overlay structure design, and calculated that the tensile stress and shear stress in asphalt layer ,semi-flexible layer and the tensile in the old cement pavement adopting BISA3.0 statics finite element analysis model when modulus in the old road was diminishing. Use the computed result to analyses the influence of old road damage condition the influence of pavement structure.

  2. Hybrid green permeable pave with hexagonal modular pavement systems

    Science.gov (United States)

    Rashid, M. A.; Abustan, I.; Hamzah, M. O.

    2013-06-01

    Modular permeable pavements are alternatives to the traditional impervious asphalt and concrete pavements. Pervious pore spaces in the surface allow for water to infiltrate into the pavement during rainfall events. As of their ability to allow water to quickly infiltrate through the surface, modular permeable pavements allow for reductions in runoff quantity and peak runoff rates. Even in areas where the underlying soil is not ideal for modular permeable pavements, the installation of under drains has still been shown to reflect these reductions. Modular permeable pavements have been regarded as an effective tool in helping with stormwater control. It also affects the water quality of stormwater runoff. Places using modular permeable pavement has been shown to cause a significant decrease in several heavy metal concentrations as well as suspended solids. Removal rates are dependent upon the material used for the pavers and sub-base material, as well as the surface void space. Most heavy metals are captured in the top layers of the void space fill media. Permeable pavements are now considered an effective BMP for reducing stormwater runoff volume and peak flow. This study examines the extent to which such combined pavement systems are capable of handling load from the vehicles. Experimental investigation were undertaken to quantify the compressive characteristics of the modular. Results shows impressive results of achieving high safety factor for daily life vehicles.

  3. Nitrogen Transformations in Three Types of Permeable Pavement

    Science.gov (United States)

    In 2009, USEPA constructed a 0.4-ha (1-ac) parking lot at the Edison Environmental Center in Edison, NJ, that incorporated three different permeable pavement types - permeable interlocking concrete pavers (PICP), pervious concrete (PC), and porous asphalt (PA). The driving lanes...

  4. Evaluation of pavement skid resistance using high speed texture measurement

    Directory of Open Access Journals (Sweden)

    Jay N. Meegoda

    2015-12-01

    Full Text Available Skid resistance is an important parameter for highway designs, construction, management, maintenance and safety. The purpose of this manuscript is to propose the correlation between skid resistance, which is measured as skid resistance trailer, and mean profile depth (MPD or the macro surface texture, which is measured by vehicle mounted laser, so that highway agencies can predict the skid resistance of pavement without the use of expensive and time consuming skid resistance trailer, which also causes disruption of traffic in use. In this research skid numbers and MPD from 5 new asphalt pavements and 4 old asphalt pavements were collected using a locked wheel skid trailer and a vehicle mounted laser. Using the data collected, a correlation between the skid number (SN40R collected by locked wheel skid tester and the texture data or MPD collected by a vehicle mounted laser operating at highway speeds was developed. The proposed correlation for new pavements was positive for MPD values less than 0.75 mm to reach a peak SN40R value, then there was a negative correlation as the MPD increases until the MPD value was equal to 1.1 mm and beyond the MPD value of 1.1 mm to the maximum value of 1.4 mm, SN40R value remained almost constant. There were significant data scatter for the MPD value of 0.8 mm. To explain these results, water film thickness during the friction test was calculated and the critical MPD was defined. The effect of sealed water pool on the SN40R was discussed. The test result showed a similar trend for older asphalt pavements, but with lower SN40R values due to the polishing of pavement micro-texture by traffic. Hence, a reduction factor was proposed for older pavements based on cumulative traffic volume for the above correlation to predict the skid resistance of older pavements.

  5. Preparation and characterization of epoxy asphalt binder for pavement of steel deck bridge%钢箱梁桥铺装用环氧沥青材料制备和表征

    Institute of Scientific and Technical Information of China (English)

    陈志明; 亢阳; 闵召辉; 黄卫

    2006-01-01

    制备两组分的热固性环氧沥青,其中一个组分是顺酐化沥青、环氧树脂的固化剂和促进剂,另外一个组分是环氧树脂.分别使用Brookfild粘度计、拉伸实验和MTS研究了沥青的铺装适用性和混凝土性能.结果表明:尽管加入的顺酐仅有50%~60%与基础沥青发生了反应,但是与未对沥青进行顺酐化比较,其固化速率、断裂延伸率和抗拉强度等都有显著的提高.4%顺酐改性的沥青和固化剂结合与环氧树脂固化后具有平均断裂延伸率281.9%,平均强度2.63 MPa,固化混凝土的Marshell稳定度37.0 kN,未固化混凝土的Marshell稳定度10.2 kN,耐疲劳实验1 200万次试件无破坏.%A kind of thermosetting asphalt binder designated as epoxy asphalt, which is composed of two components: maleated asphalt with curing agents and accelerant of epoxy resin and epoxy resin, was prepared.Its paving feasibility and concrete performances were investigated using Brookfield viscosimeter, direct tensile test (DTT), Marshall testing and the MTS 810 hydraulic servos-system, respectively. Although only 50% to 60% of added maleic anhydride (MAH) reacted with the base asphalt irreversibly (probably by Diels-Alder mechanism), the curing rate, rupture elongation and tensile strength of maleated epoxy asphalt were enhanced more evidently than those of unmaleated epoxy asphalt. As a result, an epoxy asphalt made from 4% MAH modified asphalt and other curing agents was featured to have an average rupture elongation of 281.9%, an average tensile strength of 2. 63 MPa, and the Marshall stability of its cured concrete reached 37.0 kN, while that of uncured concrete was 10. 2 kN and the combined beam of fatigue test was still found to behave well after 12 × 106 cycles load.

  6. Influence of Polyethylene Glycol on Asphaltic Concrete for Cubical and Rod shaped Aggregates

    Directory of Open Access Journals (Sweden)

    U. Arun Kumar

    2014-02-01

    Full Text Available Aggregates are the principle material in pavement construction. Conventional road aggregates in India are natural aggregates obtained by crushing rocks. Aggregate characteristics such as particle size, shape, and texture etc.., influence the performance and serviceability of pavement. Pavements laid with polymer modified asphalt exhibits greater resistance to rutting, thermal cracking and fatigue damages and hence these were used at locations of higher stress. The present work concentrates on aggregate characteristics which include the shape indices. The particle shapes namely Cubical and Rod are being used in the study. The study shows the behavior of the two shapes of aggregate in terms of Penetration, Ductility, Softening Point and Marshall Stability tests with varying percentages of asphalt and also with varying the percentages of PEG. The results of unmodified asphalt mix are compared with the modified asphalt mix against some critical Marshall Mix parameters.

  7. Preparation of Flame Retardant Modified with Titanate for Asphalt Binder

    Directory of Open Access Journals (Sweden)

    Bo Li

    2014-01-01

    Full Text Available Improving the compatibility between flame retardant and asphalt is a difficult task due to the complex nature of the materials. This study explores a low dosage compound flame retardant and seeks to improve the compatibility between flame retardants and asphalt. An orthogonal experiment was designed taking magnesium hydroxide, ammonium polyphosphate, and melamine as factors. The oil absorption and activation index were tested to determine the effect of titanate on the flame retardant additive. The pavement performance test was conducted to evaluate the effect of the flame retardant additive. Oxygen index test was conducted to confirm the effect of flame retardant on flame ability of asphalt binder. The results of this study showed that the new composite flame retardant is more effective in improving the compatibility between flame retardant and asphalt and reducing the limiting oxygen index of asphalt binder tested in this study.

  8. Operational properties of nanomodified stone mastic asphalt

    Directory of Open Access Journals (Sweden)

    Inozemtsev Sergey Sergeevich

    2015-03-01

    Full Text Available In order to prolong the lifetime and to improve the quality of pavements made of asphalt concrete it is necessary to apply innovative solutions in the process of design of such building materials. In order to solve the problem of low durability of asphalt concrete a modifier was proposed, which consists of diatomite, iron hydroxide sol (III and silica sol. Application of the diatomite with nanoscale layer of nanomodifier allows getting a stone mastic asphalt, which has high values of physical and mechanical properties and allows refusing from expensive stabilizing additive. Mineral filler was replaced by diatomite, which has been modified by iron hydroxide sol (III and silica sol. Modified diatomite allows sorption of bitumen and increase the cohesive strength and resistance to shear at positive temperatures. The modified asphalt has higher resistance to rutting at high temperature, abrasion resistance at low temperature and impact of climatic factors: alternate freezing and thawing, wetting-drying, UV and IR radiations. It is achieved by formation of solid and dense bitumen film at the phase interface and controlling the content of light fractions of the bitumen. The modifier consists of sol of iron hydroxide, which blocks the oxidation and polymerization of bitumen during operation. The proposed material allows controlling the initial structure formation of stone mastic asphalt. It was shown that modern test methods allow assessing the durability of asphalt in the design phase compositions.

  9. Performance related characterisation of the mechanical behaviour of asphalt mixtures

    NARCIS (Netherlands)

    Molenaar, J.M.M.

    2004-01-01

    The investigation was undertaken to support innovations in the field of asphalt pavement design and material selection, and to be able to evaluate or judge the risk of failure and cost-effectiveness of newly developed paving materials in order to justify their application. To be able to determine th

  10. Calculation and influence factors analysis for hydrodynamic pressure of asphalt pavement with large slope based on momentum theorem%基于动量原理的大坡度沥青路面动水压力计算及影响因素分析

    Institute of Scientific and Technical Information of China (English)

    滕旭秋; 王海峰; 文华

    2016-01-01

    在多雨地区长大纵坡沥青路面是雨天事故多发区域。应用动量定理,建立了沥青路面动水压力的力学计算模型,并系统分析了车辆荷载、行车速度和道路纵坡对动水压力的影响。结果表明,当水膜厚度<3 mm时,动水压力随车速及车辆荷载的增大而增大,上坡时,动水压力随着纵坡坡度的增大而增大,下坡时,动水压力随着纵坡坡度的增大而减小。当水膜厚度>3 mm时,动水压力随车速、车辆荷载增大而增大,上坡时,动水压力随着纵坡坡度的增大而增大,下坡时,动水压力随着纵坡坡度的增大呈先缓慢增加然后又缓慢减小的变化趋势;无论是上坡还是下坡,动水压力都随着车轮半径的增大而增大。本研究成果为多雨地区长大纵坡沥青路面重载交通高速行车易发生交通事故提供了理论分析依据。%The traffic accidents often occur easily at the asphalt pavement with large longitudinal slope in rainy regions w hen it rains .In this paper ,the mechanics model of hydrodynamic pressure for asphalt pavement is established based on momentum theorem .On this basis ,the influence of vehicle speed , vehicle load ,and longitudinal slope on hydrodynamic pressure are analyzed systematically .The results showed that :when the thickness of water film is lower than 3 mm ,hydrodynamic pressure increases with the increment of speed and vehicular load .At the same time ,hydrodynamic pressure increases with the increment of the longitudinal slope in upgrade section and decrease with the increase of longitudinal slope in downgrade section .When the thickness of water film is greater than 3 mm ,hydrodynamic pressure increases with the increment of speed and vehicular load .The hydrodynamic pressure increases with the increment of the longitudinal slope in upgrade section ,but it will first slowly increase and then slowly decrease with the increase of the longitudinal

  11. The Asphalt Handbook.

    Science.gov (United States)

    Asphalt Inst., College Park, MD.

    The new and completely revised edition of the Asphalt Handbook, a standard reference work in the field of asphalt technology and construction, summarizes with reference the information contained in other Asphalt Institute technical manuals. Major areas discussed include the following--(1) uses of asphalt, (2) terms relating to asphalt and its…

  12. Impact of the variation in dynamic vehicle load on flexible pavement responses

    Science.gov (United States)

    Ahsanuzzaman, Md

    The purpose of this research was to evaluate the dynamic variation in asphalt pavement critical responses due to dynamic tire load variations. An attempt was also made to develop generalized regression equations to predict the dynamic response variation in flexible pavement under various dynamic load conditions. The study used an extensive database of computed pavement response histories for five different types of sites (smooth, rough, medium rough, very rough and severely rough), two different asphalt pavement structures (thin and thick) at two temperatures (70 °F and 104 °F), subjected to a tandem axle dual tire at three speeds 25, 37 and 50 mph (40, 60 and 80 km/h). All pavement responses were determined using the 3D-Move Analysis program (Version 1.2) developed by University of Nevada, Reno. A new term called Dynamic Response Coefficient (DRC) was introduced in this study to address the variation in critical pavement responses due to dynamic loads as traditionally measured by the Dynamic Load Coefficient (DLC). While DLC represents the additional varying component of the tire load, DRC represents the additional varying component of the response value (standard deviation divided by mean response). In this study, DRC was compared with DLC for five different sites based on the roughness condition of the sites. Previous studies showed that DLC varies with vehicle speed and suspension types, and assumes a constant value for the whole pavement structure (lateral and vertical directions). On the other hand, in this study, DRC was found to be significantly varied with the asphalt pavement and function of pavement structure, road roughness conditions, temperatures, vehicle speeds, suspension types, and locations of the point of interest in the pavement. A major contribution of the study is that the variation of pavement responses due to dynamic load in a flexible pavement system can be predicted with generalized regression equations. Fitting parameters (R2) in the

  13. AC+C RC复合式隧道路面沥青混合料面层力学分析%Mechanical Analysis on Asphalt Surface Course of AC+CRC Tunnel Pavement

    Institute of Scientific and Technical Information of China (English)

    孙艳华; 吴超凡; 张继森; 李泉

    2014-01-01

    This paper makes a calculation and analysis of the distribution on tensile stress and shear stress of asphalt layer,on maximum shear stress and the corresponding normal stress between wear-ing layer and substratum,by using Shell design software BISAR 3.0 and the finite element software ABAQUS.The results show that the bottom of the asphalt layer appears larger compressive stress,the as-phalt surface layer appears larger tensile stress ,as the bearing layer is rigid.Regardless of the horizontal load,the asphalt layer maximum tensile stress appears transverse edge of the wheel track on the surface of asphalt layer,and maximum shear stress appears wheel bottom central below 4.5 cm off the surface;Considering horizontal load,maximum tensile stress appears the edge of the wheel track along the driving direction on the asphalt surface layer ,and the maximum shear stress appears the edge of the wheel track on the asphalt surface layer.The maximum shear stress increases with adhesion coefficient increasing be-tween asphalt surface layer and substratum,and decreases with thickness of asphalt surface layer increas-ing,which corresponding normal stress is compressive stress.%以水平荷载及沥青面层厚度作为变量,基于弹性层状体系理论,采用壳牌设计软件 BISAR 3.0和有限元软件 ABAQUS,计算分析了常温下连续配筋水泥混凝土沥青面层复合式隧道路面沥青面层的正应力与剪应力分布情况、面层表面磨耗层与下卧层层间最大剪应力及相应的正应力分布情况。结果表明:由于下承层为刚性基层,沥青面层层底出现较大的压应力,而沥青层表面出现较大的拉应力。不考虑水平荷载时,沥青面层最大拉应力出现在沥青面层表面横行轮迹边缘,最大剪应力出现在距沥青表面4.5 cm 处的轮底中央;考虑水平荷载时,沥青面层最大拉应力出现在沥青面层表面行车方向轮迹边缘,最大剪应力出现在沥

  14. Comparative Analysis of Mechanical Response of Asphalt Concrete Pavement to Different Loads%不同形式荷载下沥青混凝土路面结构力学响应的对比分析

    Institute of Scientific and Technical Information of China (English)

    陈俊; 陈景雅; 刘云; 吴建涛

    2013-01-01

    Wheel loads in present pavement analysis systems are commonly simplified as three forms,namely static load,vibrating load and moving load with a constant speed.In order to understand the diffe rence of pavement response subject to the three simplified loadings,the discrete element model of pavement structure is constructed according to a typical flexible pavement.The effects of loading on pavement structure are simulated using the discrete element method.Thereafter,comparisons of pavement response subject to the three different loading are performed.Results show that only the maximum response to moving load can be reflected by static and vibration loading.The alternation of tensile and compressive response and double-action of the horizontal shearing stress cannot be simulated by static and vibration loading.%在分析车辆荷载作用下路面结构响应时,车辆荷载通常被简化为静止、振动和匀速移动3类形式.为了准确把握荷载不同简化形式下路面结构响应的差异,根据柔性路面的典型结构形式,建立了路面结构的离散元模型;采用离散元颗粒流软件,分别模拟了静止、振动和移动荷载对路面结构的作用,并对比分析了不同荷载形式下路面结构的力学响应.结果表明,静止、振动荷载只能反映移动荷载作用于路面结构后最大响应,亦即移动荷载越过路面结构某位置的瞬间,静止荷载响应与振动和移动荷载响应的峰值相当;静止、振动荷载不能反映移动荷载对路面结构引起的拉、压交替响应,以及车辆移动引起的路面结构内水平剪应力不同方向的两次作用.

  15. 绿色环保型高性能沥青混凝土排水铺装用防水材料应用研究%Application research on the green high-performance waterproof material for asphalt concrete drainage pavement

    Institute of Scientific and Technical Information of China (English)

    杨冲; 冉千平; 孙德文

    2013-01-01

    This article introduces a high-performance resin-based waterproof materials for drainage pavement with asphalt con-crete,and its performance advantages as waterproof layer. Its excellent performance includes:4.07 MPa of adhesion to asphalt concrete base surface, 3.51 MPa of adhesion to the concrete surface, low temperature flexibility of up to -20℃,no impervious after 24 h under 1.8 MPa pressure, excellent abrasion resistance. It can not only achieve good compatibility between the waterproof layer with the substrate, but also avoid the economic losses due to performance deficiencies in the waterproof layer exist in the real project.%介绍了一种沥青混凝土排水铺装用的高性能树脂型防水材料以及其作为防水层所具备的性能优势.其优异性能表现在与沥青混凝土基面的粘结强度达4.07 MPa,与混凝土基面的粘结强度达3.51 MPa,低温弯折性可达-20℃,同时在1.8 MPa的压力下24 h不透水,耐磨性优良.不仅能够实现防水层与基层之间良好的相容性,同时避免了在实际工程中存在的因防水层性能缺陷带来的经济损失.

  16. Pavement Sealcoat, PAHs, and the Environment

    Science.gov (United States)

    Van Metre, P. C.; Mahler, B. J.

    2011-12-01

    Recent research by the USGS has identified coal-tar-based pavement sealants as a major source of polycyclic aromatic hydrocarbons (PAHs) to the environment. Coal-tar-based sealcoat is commonly used to coat parking lots and driveways and is typically is 20-35 percent coal tar pitch, a known human carcinogen. Several PAHs are suspected mutagens, carcinogens, and (or) teratogens. In the central and eastern U.S. where the coal-tar-based sealants dominate use, sum-PAH concentration in dust particles from sealcoated pavement is about 1,000 times higher than in the western U.S. where the asphalt-based formulation is prevalent. Source apportionment modeling indicates that particles from sealcoated pavement are contributing the majority of the PAHs to recent lake sediment in 35 U.S. urban lakes and are the primary cause of upward trends in PAHs in many of these lakes. Mobile particles from parking lots with coal-tar-based sealcoat are tracked indoors, resulting in elevated PAH concentrations in house dust. In a recently completed study, volatilization fluxes of PAHs from sealcoated pavement were estimated to be about 60 times fluxes from unsealed pavement. Using a wide variety of methods, the author and colleagues have shown that coal-tar-based sealcoat is a major source of PAHs to the urban environment and might pose risks to aquatic life and human health.

  17. Asphalt cement poisoning

    Science.gov (United States)

    ... petroleum material that hardens when it cools. Asphalt cement poisoning occurs when someone swallows asphalt. If hot ... found in: Road paving materials Roofing materials Tile cements Asphalt may also be used for other purposes.

  18. ENHANCING ASPHALT RHEOLOGICAL BEHAVIOR AND AGING SUSCEPTIBILITY USING BIO-CHAR AND NANO-CLAY

    OpenAIRE

    2014-01-01

    The life expectancy of Asphalt Binder (AB) has been negatively impacted by the harsh bombardment of UV rays. UV rays cause asphalt to oxidize faster, which results in deterioration of asphalt rheological characteristics that can lead to pavement distresses. This study investigates the impact of bio-char and nano-clay of asphalt rheological properties. Two nano scale materials were used for this study were nano-clay and bio-char. Nano-clay (Cloisite 30B) is a naturally occurring inorganic mine...

  19. Concrete Pavement Joint Deterioration

    OpenAIRE

    2016-01-01

    Concrete pavements are an important part of our national infrastructure. In recent years the relatively small number of reported joints deteriorating prematurely in concrete pavements around Indiana has increased. Changes over the past 45 years in INDOT specification, pavement materials, designs and construction practices, and current de-icing materials were examined and related to the durability of concrete at the joints of existing pavements. A survey of concrete pavements across the state ...

  20. Development of the Asphalt Multi-Integrated Roller Field and Experimental Studies

    Directory of Open Access Journals (Sweden)

    Abd El Halim Omar Abd El Halim

    2015-01-01

    Full Text Available Asphalt pavements have been compacted using steel drum rollers for a century. However, the problems that are observed today on these pavements are universal with no solution in sight. Intensive research work has been invested to identify the mechanisms that cause these problems. A recent development was the introduction of SuperPave mix design, GP asphalt cements, and the use of reinforcing elements ranging from polymer to steel bars. Yet it seems that none of these solutions have succeeded in eliminating any of the old problems. The pavements suffer from serious distresses regardless of the geographic location of the pavements and its design, materials, traffic loads, and climate condition. This paper presents a new approach to deal with the problems facing the asphalt pavements. While the research efforts to date concentrated on materials-related solutions, this paper identifies conventional compaction equipment as the cause of many problems observed on the pavements. The paper provides the development of the new Asphalt Multi-Integrated Roller, AMIR, and discusses new developments leading to a number of commercial field trials on several Ontario highways. The paper concludes that current compactors must be replaced with soft flat plates in order to achieve the required specifications for long term performance.

  1. Research on fracture performance of epoxy asphalt concrete based on double-K fracture criterion

    Science.gov (United States)

    Zhang, M.; Qian, Z. D.; Xue, Y. C.

    2017-01-01

    After cracks appear on steel bridge deck epoxy asphalt concrete pavement, cracks propagate fast under vehicle load. This paper studied the fracture performance of epoxy asphalt concrete, utilized single edge notched beam (SEB) three-point bending test, measured the load (P) exerted on epoxy asphalt SEB; utilized digital camera to record the fracture process of epoxy asphalt SEB, extracted the images according to the required sampling frequency and utilized Image-Pro Plus to measure the crack mouth opening displacement (CMOD) of epoxy asphalt SEB on the extracted images; calculated the double-K fracture parameters according to the P-CMOD curve. Results indicate that of epoxy asphalt concrete is 1.11 MPa and of epoxy asphalt concrete is 2.31 MPa at -15°C of epoxy asphalt concrete is 1.02 MPa and of epoxy asphalt concrete is 1.83 MPa at -5°C of epoxy asphalt concrete is 0.77 MPa and of epoxy asphalt concrete is 1.82 MPa at 5°C. The double-K fracture parameters of epoxy asphalt concrete increase slightly when the temperature decreases at the scope of -15°C to 5°C. The relation of and is .

  2. Pavement management and rehabilitation of portland cement concrete pavements

    Science.gov (United States)

    Zegeer, C. V.; Agent, K. R.; Rizenbergs, R. L.; Curtayne, P. C.; Scullion, T.; Pedigo, R. D.; Hudson, W. R.; Roberts, F. L.; Karan, M. A.; Haas, R.

    Pavement management and rehabilitation projects and techniques are discussed. The following topics are discussed: economic analyses and dynamic programming in resurfacing project selection; implementation of an urban pavement management system; pavement performance modeling for pavement management; illustration of pavement management: from data inventory to priority analysis; rehabilitation of concrete pavements by using portland cement concrete overlays; pavement management study: Illinois tollway pavement overlays; resurfacing of plain jointed-concrete pavements; design procedure for premium composite pavement; model study of anchored pavement; prestressed concrete overlay at O'Hare International Airport: in-service evaluation; and, bonded portland cement concrete resurfacing.

  3. Evaluation of Warm Mix Asphalt Additives for Use in Modified Asphalt Mixtures

    Science.gov (United States)

    Chamoun, Zahi

    The objective of this research effort is to evaluate the use of warm-mix additives with polymer modified and terminal blend tire rubber asphalt mixtures from Nevada and California. The research completed over two stages: first stage evaluated two different WMA technologies; Sasobit and Advera, and second stage evaluated one additional WMA technology; Evotherm. The experimental program covered the evaluation of resistance of the mixtures to moisture damage, the performance characteristics of the mixtures, and mechanistic analysis of mixtures in simulated pavements. In the both stages, the mixture resistance to moisture damage was evaluated using the indirect tensile test and the dynamic modulus at multiple freeze-thaw cycles, and the resistance of the various asphalt mixtures to permanent deformation using the Asphalt Mixture Performance Tester (AMPT). Resistance of the untreated mixes to fatigue cracking using the flexural beam fatigue was only completed for the first stage. One source of aggregates was sampled in, two different batches, three warm mix asphalt technologies (Advera, Sasobit and Evotherm) and three asphalt binder types (neat, polymer-modified, and terminal blend tire rubber modified asphalt binders) typically used in Nevada and California were evaluated in this study. This thesis presents the resistance of the first stage mixtures to permanent deformation and fatigue cracking using two warm-mix additives; Advera and Sasobit, and the resistance to moisture damage and permanent deformation of the second stage mixtures with only one warm-mix additive; Evotherm.

  4. Asphalt World

    OpenAIRE

    Bedwell, Simon A.

    2009-01-01

    'What, in the end, makes advertisement so superior to criticism? Not what the moving red neon sign says - but the fiery pool reflecting it in the asphalt.' Benjamin, One-Way Street 'The parade has nothing to do with women, everything to do with men... Women are simply the scenery onto which men project their narcissistic fantasies.' Mulvey, Visual & Other Pleasures With invested irony, Simon Bedwell makes drip paintings from used advertising posters, in a messy conflation of a...

  5. Road pavement condition mapping and assessment using remote sensing data based on MESMA

    Science.gov (United States)

    Pan, Y.; Zhang, X.; Jin, X.; Yu, H.; Rao, J.; Tian, S.; Luo, L.; Li, C.

    2016-04-01

    Remote sensing can be used to monitor changes of asphalt pavement condition because of the spectral change of aged asphalt material. However, owing to coarse spatial resolution of images and the limited width of roads ambient land cover types (e.g. vegetation, buildings, and soil) affect the spectral signal and add significant variability and uncertainty to analysis of road conditions. To overcome this problem, Multiple Endmember Spectral Mixture Analysis (MESMA) was tested to map asphalt pavement condition using WorldView-2 satellite imagery with eight bands spanning from visible to near infrared. Results indicated that MESMA run in a three-endmember model models mixed-pavement pixels well with a low average RMSE (0.01).

  6. Utilization of recycled asphalt concrete with warm mix asphalt and cost-benefit analysis.

    Science.gov (United States)

    Oner, Julide; Sengoz, Burak

    2015-01-01

    The asphalt paving industries are faced with two major problems. These two important challenges are generated with an increase in demand for environmentally friendly paving mixtures and the problem of rapidly rising raw materials. Recycling of reclaimed asphalt pavement (RAP) is a critical necessity to save precious aggregates and reduce the use of costly bitumen. Warm Mix Asphalt (WMA) technology provides not only the option of recycling asphalt pavement at a lower temperature than the temperature maintained in hot mixtures but also encourages the utilization of RAP and therefore saves energy and money. This paper describes the feasibility of utilizing three different WMA additives (organic, chemical and water containing) at recommended contents with different percentages of RAP. The mechanical properties and cost-benefit analysis of WMA containing RAP have been performed and compared with WMA without RAP. The results indicated that, 30%, 10% and 20% can be accepted as an optimum RAP addition related to organic, chemical and water containing additives respectively and organic additive with 30% RAP content has an appreciable increase in tensile strength over the control mix. It was also concluded that the RAP with WMA technology is the ability to reduce final cost compared to HMA and WMA mixtures.

  7. Utilization of recycled asphalt concrete with warm mix asphalt and cost-benefit analysis.

    Directory of Open Access Journals (Sweden)

    Julide Oner

    Full Text Available The asphalt paving industries are faced with two major problems. These two important challenges are generated with an increase in demand for environmentally friendly paving mixtures and the problem of rapidly rising raw materials. Recycling of reclaimed asphalt pavement (RAP is a critical necessity to save precious aggregates and reduce the use of costly bitumen. Warm Mix Asphalt (WMA technology provides not only the option of recycling asphalt pavement at a lower temperature than the temperature maintained in hot mixtures but also encourages the utilization of RAP and therefore saves energy and money. This paper describes the feasibility of utilizing three different WMA additives (organic, chemical and water containing at recommended contents with different percentages of RAP. The mechanical properties and cost-benefit analysis of WMA containing RAP have been performed and compared with WMA without RAP. The results indicated that, 30%, 10% and 20% can be accepted as an optimum RAP addition related to organic, chemical and water containing additives respectively and organic additive with 30% RAP content has an appreciable increase in tensile strength over the control mix. It was also concluded that the RAP with WMA technology is the ability to reduce final cost compared to HMA and WMA mixtures.

  8. 轮胎与沥青路面微观摩擦接触特性的分子动力学模拟%Molecular dynamics simulation of micro frictional contact characteristics between tires and asphalt pavement

    Institute of Scientific and Technical Information of China (English)

    孙凤艳; 黄璐; 汪林兵

    2016-01-01

    为了精确表征轮胎与路面微观摩擦接触特性及分子作用力效应,利用分子动力学模拟分析方法建立轮胎(聚异戊二烯)和集料(二氧化硅)三维单体模型和界面接触模型,在纳米尺度上研究轮胎和集料的微观构造和接触特性.模拟结果表明:链状聚异戊二烯分子链为螺旋状结构,分子间隙较大,易产生较大变形,而二氧化硅则为典型脆性材料,表面较为平整;界面接触模型以二氧化硅为固定基底,聚异戊二烯单链在其上匀速滑动,二者间距离为0.5 nm.接触界面摩擦特性模拟结果表明摩擦系数随着速度增加而变小,其变化趋势与实验结果相同,证明模拟结果有效.%To accurately capture micro frictional contact characteristics and intermolecular forces between tires and pavement, the three-dimensional monomer models and the interface contact model of tires represented by isoprene and aggregates represented by silica were established by the molecular dynamics method. The microscopic structure and tire-aggregate contact properties were studied in nanoscale. Simulation results show that polyisoprene molecular chain is in the spiral structure with big molecular gaps, and is easy to generate large deformation under external loading. Conversely, silica is brittle with relatively flat surfaces. In the tie-pavement contact model, silica is the fixed base, and the single-chain polyisoprene is sliding on the top of the silica base at a constant velocity. The surface distance between the silica base and the single-chain polyisoprene is 0. 5 nm. Simulation results of tire-pavement contact show that the friction coefficient decreases with the increase of sliding velocity, and the relationship between the friction coefficient and slid-ing velocity shows good agreement with test results, indicating that molecular dynamics simulation is capable to predict the tire-pavement frictional contact characteristics.

  9. LABORATORY SIMULATION OF POROUS ASPHALT PARKING LOT SYSTEM AND MIX DESIGN FOR STORM WATER MANAGEMENT

    Directory of Open Access Journals (Sweden)

    M. O. HAMZAH

    2013-04-01

    Full Text Available Porous asphalt pavement was initially developed for the purpose of improving road safety, best candidate material for quiet pavement and to avoid aquaplaning and skidding in wet weather. However, from previous studies, porous asphalt is able to mitigate surface runoff. Porous asphalt parking lots with underlying reservoir course perform as additional temporary water storage matrix that enables reduction of flash flood. This paper elaborates the development of a new porous asphalt aggregate grading design for storm water mitigation using the Nominal Maximum Aggregate Size (NMAS 20 mm. The properties of the mixes were quantified and evaluated in terms of air voids, permeability, abrasion loss and indirect tensile strength. It was found that the proposed gradation has the best permeability and Indirect Tensile Strength (ITS values when compacted at 50 blows per face with a standard Marshal compactor. The porous asphalt slab was prepared using a slab compactor to simulate porous parking lot paving at site. The porous asphalt slab was finally placed inside a locally fabricated water flow simulator to simulate a porous asphalt pavement system for parking lots.

  10. Evaluation of accelerated deterioration in NAPTF flexible test pavements

    Institute of Scientific and Technical Information of China (English)

    Kasthurirangan GOPALAKRISHNAN

    2008-01-01

    Previous research studies have successfully demonstrated the use of artificial neural network(ANN)models for predicting critical structural responses and layer moduli of highway flexible pavements.The primary objective of this study was to develop an ANN-based approach for backcalculation of pavement moduli based on heavy weight deflectometer(HWD)test data,especially in the analysis of airport flexible pavements subjected to new generation aircraft(NGA).Two medium-strength subgrade flexible test sections,at the National Airport Pavement Test Facility(NAPTF),were modeled using a finite element(FE) based pavement analysis program,which can consider the non-linear stress-dependent behavior of pavement geomaterials.A multi-layer,feed-forward network which uses an error-backpropagation algorithm was trained to approximate the HWD backcalculation function using the FE program generated synthetic database.At the NAPTF,test sections were subjected to Boeing 777 (B777)trafficking on one lane and Boeing 747(B747)trafficking on the other lane using a test machine.To monitor the effect of traffic and climatic variations on pavement structural responses.HWD tests were conducted on the traffieked lanes and on the untraffieked centerline of test sections as trafficking progressed.The trained ANN models were successfully applied on the actual HWD test data acquired at the NAPTF to predict the asphalt concrete moduli and non-1inear subgrade moduli of the medium-strength subgrade flexible test sections.

  11. Rutting Resistance of Asphalt Overlay with Multilayer Wheel Tracking Test

    Institute of Scientific and Technical Information of China (English)

    LIAO Weidong; CHEN Zheng; WU Shaopeng; MO Liantong; LIU Gang

    2006-01-01

    The rutting resistance of multilayer asphalt overlay was researched by using laboratory wheel tracking test. The effects of loading level and test temperature on rutting resistance of asphalt overlay structure were evaluated by means of multilayer specimens .In comparison with multilayer tests, standard specimens of various layers were also conducted to evaluate the rutting resistance. Experimental results indicated that the test temperature and applied load have a significant effect on rutting resistance of asphalt concrete. Higher test temperature and heavier applied load resulted in higher rut depths. In addition, the mutilayer wheel tracking test has been demonstrated to be a more reasonable solution in evaluation on rutting resistance of asphatt pavement structure beasuse it reflects the cumulative permanent deformation in all of asphalt layers.

  12. LOW-NOISE PAVEMENT AS A WAY OF LIMITATION OF TRAFFIC NOISE LEVEL

    Directory of Open Access Journals (Sweden)

    Władysław Gardziejczyk

    2014-11-01

    Full Text Available Road surface can significantlyreduce the trafficnoise level. Depending on the characteristic of the upper surface layers the differences between the maximum rolling noise levels from passing vehicles to reach values about 10 dB (A. A special group is low-noise pavements characterized by the presence of voids above 15%. Application the porous asphalt layers or asphalt mixture type BBTM affects a significantreduction the width of land surrounded the roads where permissible equivalent sound level is exceeded. Such solutions in some cases can replace acoustic barriers. Road pavements with a higher content of voids require proper maintenance because their acoustic performances are reduced during operation.

  13. Cold Region Pavements%寒区路面

    Institute of Scientific and Technical Information of China (English)

    GuyDore

    2002-01-01

    The article mainly discusses several essential problems of cold region pavement, including thermal cracking of asphalt concrete, cracking deterioration and heaving, frost heave, seasonal and long term roughness induced by different frost heave, frost heave cracking, bearing capacity loss during spring thaw. The reason for these problems is that cold region pavements are subjected to intense solicitation by climatic and environmental factors. The author offers several models corresponding to the solicitation. Furthermore in conclusion of the article the author indicates future research for cold region.

  14. Paint Pavement Marking Performance Prediction Model That Includes the Impacts of Snow Removal Operations

    Science.gov (United States)

    2011-03-01

    Hypothesized that snow plows wear down mountain road pavement markings. 2007 Craig et al. -Edge lines degrade slower than center/skip lines 2007...retroreflectivity to create the models. They discovered that paint pavement markings last 80% longer on Portland Cement Concrete than Asphalt Concrete at low AADT...retroreflectivity, while yellow markings lost 21%. Lu and Barter attributed the sizable degradation to snow removal, sand application, and studded

  15. Permeable pavement study (Edison)

    Data.gov (United States)

    U.S. Environmental Protection Agency — While permeable pavement is increasingly being used to control stormwater runoff, field-based, side-by-side investigations on the effects different pavement types...

  16. Pavement Subgrade Performance Study

    DEFF Research Database (Denmark)

    Zhang, Wei; Ullidtz, Per; Macdonald, Robin

    1998-01-01

    The report describes the second test in the Danish Road Testing Machine (RTM) under the International Pavement Subgrade Performance Study. Pavement response was measured in different layers, and compared to different theroretical values. Performance in terms of plastic strains, rutting...

  17. Rendering the loss of strength in dry concretes with addition of milled asphalt through microscopic analysis

    Directory of Open Access Journals (Sweden)

    T. Sachet

    Full Text Available Milled asphalt removed from old pavement carpets requires tenable handling easily reachable through its incorporation within other paving materials. This work deals with the effects of such incorporation to dry compacted concretes. Fine, intermediate, coarse and whole portions of milled asphalts were blended to a reference concrete. Mechanical tests disclosed remarkable losses on its strengths and modulus of elasticity; for the stereoscope and scanning microscopy pointed out impaired transition zones between the cement paste and the milled aggregates involved by thin asphalt films. Nevertheless, the mechanical results shown that the concretes with incorporated milled asphalt aggregates are suitable for use in pavement layers as bases and sub-bases even with reduced mechanical parameters.

  18. Comparative field permeability measurement of permeable pavements using ASTM C1701 and NCAT permeameter methods.

    Science.gov (United States)

    Li, Hui; Kayhanian, Masoud; Harvey, John T

    2013-03-30

    Fully permeable pavement is gradually gaining support as an alternative best management practice (BMP) for stormwater runoff management. As the use of these pavements increases, a definitive test method is needed to measure hydraulic performance and to evaluate clogging, both for performance studies and for assessment of permeability for construction quality assurance and maintenance needs assessment. Two of the most commonly used permeability measurement tests for porous asphalt and pervious concrete are the National Center for Asphalt Technology (NCAT) permeameter and ASTM C1701, respectively. This study was undertaken to compare measured values for both methods in the field on a variety of permeable pavements used in current practice. The field measurements were performed using six experimental section designs with different permeable pavement surface types including pervious concrete, porous asphalt and permeable interlocking concrete pavers. Multiple measurements were performed at five locations on each pavement test section. The results showed that: (i) silicone gel is a superior sealing material to prevent water leakage compared with conventional plumbing putty; (ii) both methods (NCAT and ASTM) can effectively be used to measure the permeability of all pavement types and the surface material type will not impact the measurement precision; (iii) the permeability values measured with the ASTM method were 50-90% (75% on average) lower than those measured with the NCAT method; (iv) the larger permeameter cylinder diameter used in the ASTM method improved the reliability and reduced the variability of the measured permeability.

  19. The reinforcement and healing of asphalt mastic mixtures by rejuvenator encapsulation in alginate compartmented fibres

    Science.gov (United States)

    Tabaković, A.; Post, W.; Cantero, D.; Copuroglu, O.; Garcia, S. J.; Schlangen, E.

    2016-08-01

    This paper explores the potential use of compartmented alginate fibres as a new method of incorporating rejuvenators into asphalt pavement mixtures. The compartmented fibres are employed to locally distribute the rejuvenator and to overcome the problems associated with spherical capsules and hollow fibres. The work presents proof of concept of the encapsulation process which involved embedding the fibres into the asphalt mastic mixture and the survival rate of fibres in the asphalt mixture. To prove the effectiveness of the alginate as a rejuvenator encapsulating material and to demonstrate its ability survive asphalt production process, the fibres containing the rejuvenator were prepared and subjected to thermogravimetric analysis and uniaxial tensile test. The test results demonstrated that fibres have suitable thermal and mechanical strength to survive the asphalt mixing and compaction process. The CT scan of an asphalt mortar mix containing fibres demonstrated that fibres are present in the mix in their full length, undamaged, providing confirmation that the fibres survived the asphalt production process. In order to investigate the fibres physiological properties and ability to release the rejuvenator into cracks in the asphalt mastic, the environmental scanning electron microscope and optical microscope analysis were employed. To prove its success as an asphalt healing system, compartmented alginate fibres containing rejuvenator were embedded in asphalt mastic mix. The three point bend tests were performed on the asphalt mastic test samples and the degree to which the samples began to self-heal in response was measured and quantified. The research findings indicate that alginate fibres present a promising new approach for the development of self-healing asphalt pavement systems.

  20. Effect Analysis of Vehicle System Parameters on Dynamic Response of Pavement

    Directory of Open Access Journals (Sweden)

    Rong-xia Xia

    2015-01-01

    Full Text Available In order to study the damage of a semirigid pavement under vehicle loads with varied parameters, the random dynamic loads applied on the pavement by a running vehicle were computed with two degrees of freedom, quarter-vehicle model, and then a three-dimensional finite element analysis model of semirigid asphalt pavement was established. With the peak stress index of each pavement layer, the effect of varied vehicle parameters on pavement response was studied. The results indicated that the stress wave frequency of each pavement layer was similar to that of the dynamic random load, and, with increased pavement depth, the wave effect decreased. The pavement response increased with increased suspension stiffness and tire stiffness and decreased with increased suspension damping and tire damping. Furthermore, compared to the stiffness, the response variation induced by the damping was orders of magnitude lower. Compared with the traditional time response analysis method, the peak response analysis of the pavement structure was more scientific, rational, and intuitive, which could be useful for the study of vehicle-pavement interaction and road damage.

  1. Evaluation of Hydrated Lime Filler in Asphalt Mixtures

    Directory of Open Access Journals (Sweden)

    Mohammed Abbas Hasan Al-Jumaily

    2008-01-01

    Full Text Available Mineral filler is one of important materials and affecting on properties and quality of asphalt mixtures .There are different types of mineral filler depended on cost and quality , the matter encourages us to achieve this study to evaluate hydrated lime filler effects on properties of asphalt mixes related with strength and durability. Conventional asphaltic concrete mixtures with Portland cement and soft sandstone fillers and mixtures modified with hydrated lime were evaluated for their fundamental engineering properties as defined by Marshall properties , index of retained strength , indirect tensile strength , permanent deformation characteristics , and fatigue resistance .A typical dense graded mixture employed in construction of surface course pavement in Iraq in accordance with SCRB specifications was used .The materials used in this study included mineral aggregate materials (coarse and fine sizes were originally obtained from Najaf Sea quarries and two grades of asphalt cements produced from Daurah refinery which are D47 and D66 . The physical properties , stiffness modulus and chemical composition are evaluated for the recovered asphalt cement from prepared asphalt mixes containing various filler types .The paper results indicated that the addition of hydrated lime as mineral filler improved the permanent deformation characteristics and fatigue life and the use of hydrated lime will decrease the moisture susceptibility of the asphalt mixtures.

  2. Evaluation of Fatigue Resistance for Modified Asphalt Concrete Mixtures Based on Dissipated Energy Concept

    OpenAIRE

    Khodary Moalla Hamed, Farag

    2010-01-01

    The performance of asphalt concrete pavement depends on the bitumen properties, asphalt concrete mixtures volumetric properties and external factors such as traffic volume and environment. Bitumen is a visco-elastic material where temperature and rate of load application have a great influence on its behavior. Conventional bitumen is exposed to a wide range of loading and weather conditions; it is soft in a hot environment and brittle in cold weather. Higher traffic volume produces high stres...

  3. Black curves and creep behaviour of crumb rubber modified binders containing warm mix asphalt additives

    Science.gov (United States)

    Gallego, Juan; Rodríguez-Alloza, Ana María; Giuliani, Felice

    2016-08-01

    Warm mix asphalt (WMA) is a new research topic in the field of road pavement materials. This technology allows lower energy consumption and greenhouse gas (GHG) emissions by reducing compaction and placement temperatures of the asphalt mixtures. However, this technology is still under study, and the influence of the WMA additives has yet to be investigated thoroughly and clearly identified, especially in the case of crumb rubber modified (CRM) binders.

  4. A multiscale model for predicting the viscoelastic properties of asphalt concrete

    Science.gov (United States)

    Garcia Cucalon, Lorena; Rahmani, Eisa; Little, Dallas N.; Allen, David H.

    2016-08-01

    It is well known that the accurate prediction of long term performance of asphalt concrete pavement requires modeling to account for viscoelasticity within the mastic. However, accounting for viscoelasticity can be costly when the material properties are measured at the scale of asphalt concrete. This is due to the fact that the material testing protocols must be performed recursively for each mixture considered for use in the final design.

  5. Investigations of the dynamics of road pavement reflectance

    Institute of Scientific and Technical Information of China (English)

    Kang Jiang; Kai Yu; Yongchao Zhao

    2012-01-01

    Road pavement reflectance is usually assumed to be invariant in short periods of time in some quantitative remote sensing applications. To examine its variability,reflectance sequences of concrete and asphalt pavement are measured in field for half a day in visible and near-infarecd (VNIR) spectral range using dual-beam method.As much as 20.7% and 3.52% of relative changes are found in asphalt and concrete reflectance data at 550 nm,and all VNIR bands demonstrate similar variations found to correlate with both illumination geometry and the relative portion of diffuse irradiance.In this letter,this effect is interpreted from a mathematic view.Further studies are needed to model the dynamics of reflectance physically.

  6. Preparation of capsules containing rejuvenators for their use in asphalt concrete.

    Science.gov (United States)

    García, Alvaro; Schlangen, Erik; van de Ven, Martin; Sierra-Beltrán, Guadalupe

    2010-12-15

    Every year, there is a demand of more than 110 million metric tons of asphalt all around the world. This represents a huge amount of money and energy, from which a good part is for the preservation and renovation of the existing pavements. The problem of asphalt is that it oxidizes with time and therefore its beneficial properties disappear. Traditionally, rejuvenators spread in the road surface, are used to restore the original properties of the pavement. The problem is that, for a rejuvenator to be successful, it must penetrate the pavement surface. Furthermore, application of a rejuvenator will reduce the skid resistance of the pavement and, besides, rejuvenators have many aromatic compounds that can be harmful for the environment. To solve these problems this paper introduces a new concept in road construction: encapsulated rejuvenators. The basic principle is that when the stress in capsules embedded in the asphalt reaches a certain threshold value, the capsules break and some rejuvenator is released, restoring the original properties of the pavement. This paper will show how to prepare such capsules and how to determine their characteristics. This is one of the first steps towards intelligent pavements.

  7. 开粒度与保水性沥青路面铺装材料表面蒸发冷却效果的比较%Comparative Study on Surface Evaporative Cooling Abilities of Asphalt and Water Retention Asphalt Pavement Materials

    Institute of Scientific and Technical Information of China (English)

    陈伟娇; 水谷章夫

    2011-01-01

    表面铺装是影响城市热岛现象的重要因素之一,而蒸发冷却是可以降低铺装表面温度的一种有效方法.研究可知现今采用的一般表面铺装材料不具有吸水性和保水性,而蒸发冷却效果仅仅在表面洒水后的短暂时间内产生作用.本文通过对蒸发冷却效果的定量分析,研制开发出了具有吸水性和保水性的表面铺装材料,具有长时间稳定的蒸发冷却效果,可在一定程度上缓解城市热岛现象.%Surface pavement is one of the important factors that has influence on heat island phenomenon, while evaporative cooling is an effect method to decrease the rood surface temperature.Based on the studies, it was known that the normal surface pavement material does not have the properties of water absorption and water retention, the evaporative cooling could only have effect during the short time period after the surface was watered.In this paper, with the quantitative analysis, the surface pavement material with water absorption and water retention properties was developed.This material had steady performance and could relieve the heat island phenomenon at some extent.

  8. A review of changes in composition of hot mix asphalt in the United States.

    Science.gov (United States)

    Mundt, Diane J; Marano, Kristin M; Nunes, Anthony P; Adams, Robert C

    2009-11-01

    This review researched the materials, methods, and practices in the hot mix asphalt industry that might impact future exposure assessments and epidemiologic research on road paving workers. Since World War II, the U.S. interstate highway system, increased traffic volume, transportation speeds, and vehicle axle loads have necessitated an increase in demand for hot mix asphalt for road construction and maintenance, while requiring a consistent road paving product that meets state-specific physical performance specifications. We reviewed typical practices in hot mix asphalt paving in the United States to understand the extent to which materials are and have been added to hot mix asphalt to meet specifications and how changes in practices and technology could affect evaluation of worker exposures for future research. Historical documents were reviewed, and industry experts from 16 states were interviewed to obtain relevant information on industry practices. Participants from all states reported additive use, with most being less than 2% by weight. Crumb rubber and recycled asphalt pavement were added in concentrations approximately 10% per unit weight of the mix. The most frequently added materials included polymers and anti-stripping agents. Crumb rubber, sulfur, asbestos, roofing shingles, slag, or fly ash have been used in limited amounts for short periods of time or in limited geographic areas. No state reported using coal tar as an additive to hot mix asphalt or as a binder alternative in hot mix pavements for high-volume road construction. Coal tar may be present in recycled asphalt pavement from historical use, which would need to be considered in future exposure assessments of pavers. Changes in hot mix asphalt production and laydown emission control equipment have been universally implemented over time as the technology has become available to reduce potential worker exposures. This work is a companion review to a study undertaken in the petroleum refining

  9. Low temperature asphalt mixtures

    OpenAIRE

    Modrijan, Damjan

    2006-01-01

    This thesis presents the problem of manufacturing and building in the asphalt mixtures produced by the classical hot procedure and the possibility of manufacturing low temperature asphalt mixtures.We will see the main advantages of low temperature asphalt mixtures prepared with bitumen with organic addition Sasobit and compare it to the classical asphalt mixtures. The advantages and disadvantages of that are valued in the practical example in the conclusion.

  10. Development of an asphalt aging procedure to assess long-term binder performance

    KAUST Repository

    Juristyarini, Pramitha

    2011-09-07

    Nine asphalts, including seven Strategic Highway Research Program asphalts and two Texas asphalts, were aged at several conditions of temperature and oxygen pressure to develop an aging test. Values for a dynamic shear rheometer function, a combination of both elastic and viscous properties that serves as an indicator of susceptibility to age-related pavement cracking, were measured for both aged and unaged samples. Each aging condition was ranked and calibrated against environmental room aging (60°C, 1 atm air), used to simulate road aging. PAV thin-film aging at 90°C, 20 atm air for 32 hr best represented environmental room aging. © Taylor & Francis Group, LLC.

  11. Mechanistic Methodology for Airport Pavement Design with Engineering Fabrics. Volume 1. Theoretical and Experimental Bases.

    Science.gov (United States)

    1984-08-01

    DOTIFAAIPM-8419,, Mechanistic Methodology for Program Engineering& Airport Pavement Design with Maintenance Service Engineerin Washington, D.C. 20591...Reflective cracks require labor intensive operations for crack sealing and patching, thus becoming a significant maintenance expense item. The problem of...models or prediciting allowable critical strains are not available. The problems are complicated further by the fact that since asphaltic concrete is a

  12. Coal-tar-based pavement sealcoat, polycyclic aromatic Hydrocarbons (PAHs), and environmental health

    Science.gov (United States)

    Mahler, B.J.; Van Metre, P.C.

    2011-01-01

    Studies by the U.S. Geological Survey (USGS) have identified coal-tar-based sealcoat-the black, viscous liquid sprayed or painted on asphalt pavement such as parking lots-as a major source of polycyclic aromatic hydrocarbon (PAH) contamination in urban areas for large parts of the Nation. Several PAHs are suspected human carcinogens and are toxic to aquatic life.

  13. Application of cement cold in-place recycling technology in asphalt pavement engineering%水泥就地冷再生技术在沥青路面工程中的应用

    Institute of Scientific and Technical Information of China (English)

    汪亚波; 刘森

    2012-01-01

    结合245省道东海段路面大修工程实例,研究了水泥就地冷再生底基层的施工应用,就水泥就地冷再生底基层施工的配合比试验、施工前的准备工作进行了详细阐述,并在此基础上对其施工工艺及质量控制要点进行了深入的探讨和总结,结果表明,水泥就地冷再生底基层按照要求施工工程质量是有保证的,在旧路大修或改建中有着广泛的应用前景。%Combined with the project example of pavement repair in provincial road 245 of Donghai,research on the cement cold in-place recycling subbase construction application.This article details elaborates the mix proportion experiment of cement cold in-place recycling subbase and the preparation before the construction,and on the basis of its construction process and quality control of in-depth discussion and summary.The results show that the cement cold in-place recycling subbase in accordance with the requirements of the construction project quality is guaranteed.In the old road repairs or alterations have a wide future of applications.

  14. Evaluation system for CO2 emission of hot asphalt mixture

    Directory of Open Access Journals (Sweden)

    Bo Peng

    2015-04-01

    Full Text Available The highway construction industry plays an important role in economic and development, but is also a primary source of carbon emission. Accordingly, with the global climate change, energy conservation and reduction of carbon emissions have become critical issues in the highway construction industry. However, to date, a model for the highway construction industry has not been established. Hence, to implement a low-carbon construction model for highways, this study divided asphalt pavement construction into aggregate stacking, aggregate supply, and other stages, and compiled a list of energy consumption investigation. An appropriate calculation model of CO2 emission was then built. Based on the carbon emission calculation model, the proportion of carbon emissions in each stage was analyzed. The analytic hierarchy process was used to establish the system of asphalt pavement construction with a judgment matrix, thereby enabling calculation of the weight coefficient of each link. In addition, the stages of aggregate heating, asphalt heating, and asphalt mixture mixing were defined as key stages of asphalt pavement construction. Carbon emissions at these stages accounted for approximately 90% of the total carbon emissions. Carbon emissions at each stage and their impact on the environment were quantified and compared. The energy saving construction schemes as well as the environmental and socioeconomic benefits were then proposed. Through these schemes, significant reductions in carbon emissions and costs can be achieved. The results indicate that carbon emissions reduce by 32.30% and 35.93%, whereas costs reduce by 18.58% and 6.03%. The proposed energy-saving and emission reduction scheme can provide a theoretical basis and technical support for the development of low-carbon highway construction.

  15. Size-dependent enrichment of waste slag aggregate fragments abraded from asphalt concrete.

    Science.gov (United States)

    Takahashi, Fumitake; Shimaoka, Takayuki; Gardner, Kevin; Kida, Akiko

    2011-10-30

    Authors consider the environmental prospects of using melted waste slag as the aggregate for asphalt pavement. In particular, the enrichment of slag-derived fragments in fine abrasion dust particles originated from slag asphalt concrete and its size dependency were concerned. A series of surface abrasion tests for asphalt concrete specimens, containing only natural aggregates as reference or 30 wt% of substituted slag aggregates, were performed. Although two of three slag-asphalt concretes generated 1.5-3.0 times larger amount of abrasion dust than the reference asphalt concrete did, it could not be explained only by abrasion resistance of slag. The enrichment of slag-derived fragments in abrasion dust, estimated on the basis of the peak intensity of quartz and heavy metal concentrations, had size dependency for all slag-asphalt concretes. Slag-derived fragments were enriched in abrasion dust particles with diameters of 150-1000 μm. Enrichment factors were 1.4-2.1. In contrast, there was no enrichment in abrasion dust particles with diameter less than 75 μm. This suggests that prior airborne-size fragmentation of substituted slag aggregates does not need to be considered for tested slag aggregates when environmental risks of abrasion dust of slag-asphalt pavement are assessed.

  16. The Potential of Heat Collection from Solar Radiation in Asphalt Solar Collectors in Malaysia

    Science.gov (United States)

    Beddu, Salmia; Talib, Siti Hidayah Abdul; Itam, Zarina

    2016-03-01

    The implementation of asphalt solar collectors as a means of an energy source is being widely studied in recent years. Asphalt pavements are exposed to daily solar radiation, and are capable of reaching up to 70°C in temperature. The potential of harvesting energy from solar pavements as an alternative energy source in replace of non-renewable energy sources prone to depletion such as fuel is promising. In Malaysia, the sun intensity is quite high and for this reason, absorbing the heat from sun radiation, and then utilizing it in many other applications such as generating electricity could definitely be impressive. Previous researches on the different methods of studying the effect of heat absorption caused by solar radiation prove to be quite old and inaffective. More recent findings, on the otherhand, prove to be more informative. This paper focuses on determining the potential of heat collection from solar radiation in asphalt solar collectors using steel piping. The asphalt solar collector model constructed for this research was prepared in the civil engineering laboratory. The hot mixed asphalt (HMA) contains 10% bitumen mixed with 90% aggregates of the total size of asphalt. Three stainless steel pipes were embedded into the interior region of the model according to the design criteria, and then put to test. Results show that harvesting energy from asphalt solar collectors proves highly potential in Malaysia due its the hot climate.

  17. Caltrans use of scrap tires in asphalt rubber products: a comprehensive review

    Directory of Open Access Journals (Sweden)

    Haiping Zhou

    2014-02-01

    Full Text Available The California Department of Transportation (Caltrans has been using scrap tire rubber in asphalt pavements since the 1970s in chip seals and the 1980s in rubberized hot mix asphalt(RHMA. Both the wet (field blend and dry processes were used in early trials. Caltrans has also used rubber modified binders containing both crumb rubber modifier and polymer modifier that could be manufactured at a refinery facility, a terminal blend wet process. Since the beginning of this century, Caltrans increased the use of scrap tire rubber in paving projects and invested considerable resources in developing technically sound, cost effective, and environmentally friendly strategies for using scrap tire rubber in roadway applications. By the end of year 2010, approximately 31%of all hot mix asphalt (HMA placed by Caltrans was rubberized HMA, roughly 1.2 million tons. Caltrans efforts in using asphalt rubber products were also demonstrated in its research and technology development. These included the construction of two full-scale field experiments, five warranty projects, and an accelerated pavement study using a heavy vehicle simulator. Additionally, terminal blend asphalt rubber and rubberized warm mix asphalts began to be experimented on trial basis. This paper provides a comprehensive review of Caltrans experience over four decades with asphalt rubber products. Current practices and future outlook are also discussed.

  18. Application of viscoelastic continuum damage approach to predict fatigue performance of Binzhou perpetual pavements

    Directory of Open Access Journals (Sweden)

    Wei Cao

    2016-04-01

    Full Text Available For this study, the Binzhou perpetual pavement test sections constructed in Shandong Province, China, were simulated for long-term fatigue performance using the layered viscoelastic pavement analysis for critical distresses (LVECD finite element software package. In this framework, asphalt concrete was treated in the context of linear viscoelastic continuum damage theory. A recently developed unified fatigue failure criterion that defined the boundaries of the applicable region of the theory was also incorporated. The mechanistic modeling of the fatigue mechanisms was able to accommodate the complex temperature variations and loading conditions of the field pavements in a rigorous manner. All of the material models were conveniently characterized by dynamic modulus tests and direct tension cyclic fatigue tests in the laboratory using cylindrical specimens. By comparing the obtained damage characteristic curves and failure criteria, it is found that mixtures with small aggregate particle sizes, a dense gradation, and modified asphalt binder tended to exhibit the best fatigue resistance at the material level. The 15-year finite element structural simulation results for all the test sections indicate that fatigue performance has a strong dependence on the thickness of the asphalt pavements. Based on the predicted location and severity of the fatigue damage, it is recommended that Sections 1 and 3 of the Binzhou test sections be employed for perpetual pavement design.

  19. Thermal stresses of flexible pavement with consideration of temperature-dependent material characteristics using stiffness matrix method

    Science.gov (United States)

    Geng, Litao; Ren, Ruibo; Zhong, Yang; Xu, Qian

    2011-02-01

    The asphalt pavement is regarded as a multilayered elastic half space axisymmetrical body. By introducing the relationship between material characteristics and temperature into the fundamental equations of thermoelasticity and using mathematic methods of Laplace and Hankel integral transformation, the stiffness matrix for a layer is derived firstly. Then the global stiffness matrix is established for multilayered elastic half space using the finite element concepts in which layers are completely contacted. Therefore, explicit solution for thermal stresses of the asphalt pavement is obtained from the solution of the algebra equation formed by global stiffness matrix and the inverse Hankel and Laplace integral transformation. Because the elements of matrix do not include positive exponential function, the calculation is not overflowed and the shortages of transfer matrix method are overcome. This approach serves as a better model for real pavement structure as it takes into account the relationships between the material characteristics and temperature in the pavement system.

  20. Mechanical evaluation of asphalt-aggregate mixtures prepared with fly ash as a filler replacement

    Energy Technology Data Exchange (ETDEWEB)

    Tapkin, T. [Anadolu Univ., Eskisehir (Turkey). Dept. of Civil Engineering

    2008-01-15

    This paper examined methods of introducing fly ash waste products as a filler in asphalt concrete mixtures. A literature review of studies involving fly ash and asphalts was conducted. The effect of fly ash filler replacements on the mechanical properties of asphalt-aggregate mixtures was investigated. A dense bituminous calcareous aggregate was used as a reference mixture for a series of tests. Three types of fly ash were investigated, notably (1) portland cement; (2) lime; and (3) control specimens. Changes in elastic strain, elastic modulus, and permanent strain properties of the asphalt mixtures were determined through a series of fatigue tests. The behaviour of the asphalt concrete pavements were analyzed under applied loads. Results of the tests showed that the fatigue life of the fly ash specimens was higher than the calcareous aggregate specimens. It was concluded that fly ash can used as a filler replacement for dense-graded wearing courses. 35 refs., 17 tabs., 8 figs.

  1. Pavement Testing Facility

    Data.gov (United States)

    Federal Laboratory Consortium — Comprehensive Environmental and Structural AnalysesThe ERDC Pavement Testing Facility, located on the ERDC Vicksburg campus, was originally constructed to provide an...

  2. Pavement Testing Facility

    Data.gov (United States)

    Federal Laboratory Consortium — Comprehensive Environmental and Structural Analyses The ERDC Pavement Testing Facility, located on the ERDC Vicksburg campus, was originally constructed to provide...

  3. Damage development in the adhesive zone and mortar of porous asphalt concrete

    NARCIS (Netherlands)

    Mo, L.T.

    2010-01-01

    This research is focused on damage development in the adhesive zone and the mortar of porous asphalt concrete. The motive of this research is the loss of stone from the pavement surface, the so-called ravelling of noise reducing surface wearing courses. Ravelling is the dominant defect of porous asp

  4. Mechanistic and Economical Characteristics of Asphalt Rubber Mixtures

    Directory of Open Access Journals (Sweden)

    Mena I. Souliman

    2016-01-01

    Full Text Available Load associated fatigue cracking is one of the major distress types occurring in flexible pavement systems. Flexural bending beam fatigue laboratory test has been used for several decades and is considered to be an integral part of the new superpave advanced characterization procedure. One of the most significant solutions to prolong the fatigue life for an asphaltic mixture is to utilize flexible materials as rubber. A laboratory testing program was performed on a conventional and Asphalt Rubber- (AR- gap-graded mixtures to investigate the impact of added rubber on the mechanical, mechanistic, and economical attributes of asphaltic mixtures. Strain controlled fatigue tests were conducted according to American Association of State Highway and Transportation Officials (AASHTO procedures. The results from the beam fatigue tests indicated that the AR-gap-graded mixtures would have much longer fatigue life compared with the reference (conventional mixtures. In addition, a mechanistic analysis using 3D-Move software coupled with a cost analysis study based on the fatigue performance on the two mixtures was performed. Overall, analysis showed that AR modified asphalt mixtures exhibited significantly lower cost of pavement per 1000 cycles of fatigue life per mile compared to conventional HMA mixture.

  5. Deformation Parameters and Fatigue of the Recycled Asphalt Mixtures

    Science.gov (United States)

    Šrámek, Juraj

    2015-12-01

    The deformational properties of asphalt mixtures measured by dynamic methods and fatigue allow a design the road to suit the expected traffic load. Quality of mixtures is also expressed by the resistance to permanent deformation. Complex modulus of stiffness and fatigue can reliably characterize the proposed mixture of asphalt pavement. The complex modulus (E*) measurement of asphalt mixtures are carried out in laboratory of Department of Construction Management at University of Žilina by two-point bending test method on trapezoid-shaped samples. Today, the fatigue is verified on trapezoid-shaped samples and is assessed by proportional strain at 1 million cycles (ɛ6). The test equipment and software is used to evaluate fatigue and deformation characteristics.

  6. 市政道路沥青路面现场热再生施工技术研究%Study of In-place Hot Recycling Construction Technology of Municipal Road Asphalt Pavement

    Institute of Scientific and Technical Information of China (English)

    王孟晖

    2016-01-01

    伴随着我国整体经济水平的快速发展,城市化进程也在持续的推进发展之中,因此相应的市政道路扩修工程也日益增多。原本的老旧市政道路大多存在有各类不同程度的问题病害,必须要开展大规模的维修处理,与以往较常采用的传统修复方法相比,现场热再生施工技术能够在对旧料的利用方面效果更好,能够极大地降低沥青废弃量,并且施工速度较快,工程周期较短,能够最大程度的降低交通影响。希望通过本文的分析研究,能够为相关的市政道路扩修工程提供一些必要的参考。%With the rapid development of China's overall economic level, urbanization process is in continuous development, thus corresponding municipal road expansion project also increases. Most of the old municipal roads have various kinds of problems, which must be carried out in large scale. Compared with the traditional repair methods which are used in the past, in-place hot recycling construction technology can be more effective in the use of the old material, can greatly reduce the amount of asphalt waste, and the construction speed is fast, the project cycle is short, and it can also reduce the traffic influence to the maximum degree. The author hopes that this paper can provide some necessary reference for the related municipal road project.

  7. Optimization of technical measures for improving high-temperature performance of asphalt-rubber mixture

    Institute of Scientific and Technical Information of China (English)

    Chuan Xiao; Tianqing Ling; Yanjun Qiu

    2013-01-01

    Asphalt-rubber pavements often become dam-aged in high-temperature regions and appear rutted or wavy, and experience slippage. To improve the high-tem-perature performance of the asphalt-rubber mixture, tech-nical measurements, such as, the optimal adjustment of gradation, technique of composite modification, and con-trol of compaction were investigated. An optimal adjust-ment of aggregate gradation based on stone matrix asphalt improves the high-temperature stability of the asphalt-rubber mixture significantly. Through composite modifi-cation, the effect of asphalt-rubber modification was enhanced, and the dynamic stability and relative defor-mation indices of the asphalt-rubber mixture were improved significantly. Furthermore, compaction parame-ters had a significant influence on the high-temperature stability of the asphalt-rubber mixture. The rolling times for compacting the asphalt-rubber mixture should be controlled to within 18-20 round-trips at a molding tem-perature at 180 ?C;if the rolling time is a 12 round-trip, the compaction temperature of the asphalt-rubber mixture should be controlled between 180 and 190 ?C.

  8. Application of minerals residues in the asphalt composition; Aplicacao de residuos minerais na composicao do asfalto

    Energy Technology Data Exchange (ETDEWEB)

    Ribeiro, Roberto Carlos da C.; Seidl, Peter Rudolf [Universidade Federal do Rio de Janeiro (UFRJ), RJ (Brazil). Escola de Quimica; Correia, Julio Cesar Guedes [Centro de Tecnologia Mineral - CETEM, Rio de Janeiro, RJ (Brazil)

    2004-07-01

    The performance of asphalt pavements depends mainly on the properties of their constituents: mineral aggregates and asphalt cement. The mineral aggregate represents about 95% in weight of asphalt mixtures having a significant influence on the properties and performance of these mixtures. Asphalt cement (CAP) corresponds to the smaller fraction but it is mainly responsible for adsorption on the mineral aggregates. The objective of this study was to evaluate the interaction between different CAPs with residues from granite saw wills in place of mineral aggregates that run up costs with extraction and processing in asphalt production. This way asphalt production costs as well as the environmental problems that are caused by mineral residue are reduced. Five different asphalt cements, referred to as A, B, C, D and E, and a granite residue were used in this work. The results indicated that the residue strongly absorbs all the CAPs that were studied; particularly CAP A, which is considered the most adequate for the production of asphalt from this residue. Preliminary tests this indicate that asphalt production can use mineral residues instead of mineral aggregates in its composition. (author)

  9. 京秦高速公路路面早期破坏原因%Early Damage Reason of Jingqin Expressway Pavement

    Institute of Scientific and Technical Information of China (English)

    李伯威

    2012-01-01

    Common damage causes of asphalt design, thickness design, mixing design, pavement pavement quality are put forward. pavement are analyzed. From the aspects of pavement structure field construction and so on, technical measures for improving%对沥青路面常见病害产生的原因进行分析,并从路面结构设计、厚度设计、配合比设计及路面现场施工等方面提出提高路面质量的技术措施。

  10. Study of the Effect of Temperature Changes on the Elastic Modulus of Flexible Pavement Layers

    Directory of Open Access Journals (Sweden)

    Mohd Raihan Taha

    2013-02-01

    Full Text Available In general, the stiffness of flexible pavement is influenced by environmental changes, whereby temperature and rainfall affect the asphalt layer and non-asphalt layer, such as the subgrade, respectively. Normally, the effect of temperature on flexible pavement can be measured using two methods. The first is a destructive test whereby core samples are tested in a laboratory using a Universal Testing Machine (UTM. The second is a non-destructive in situ test using equipment such as a Falling Weight Deflectometer (FWD and Spectral Analysis of Surface Waves (SASW. This study was conducted to investigate the effect of temperature at different tensile levels on the Soekarno-Hatta and Purwakarta Cikampek roads in Bandung, West Java, Indonesia. It is observed that different tensile levels and testing methods result in various elastic modulus values of flexible pavement. The higher the temperature applied to the flexible pavement layer, the more the elastic modulus values decrease. In contrast, the lower the temperature imposed on the flexible pavement layer, the more the elastic modulus values increase. Different testing methods (FWD, UTM and SASW on the flexible pavement layer are also affected by temperature changes.

  11. The effect of mineralogy, texture and mechanical properties of anti-skid and asphalt aggregates on urban dust

    OpenAIRE

    RÀisÀnen, M.; Kupiainen, K.; Tervahattu, H.

    2003-01-01

    In northern latitudes mineral dust is formed when cars use studded tyres and roads are sanded to obtain more traction on the icy surfaces. Anti-skid and asphalt aggregates with different textural, mineralogical and mechanical properties were tested with an indoor road simulator fitted with studded and friction tyres. The particle size distribution and proportions of dust from pavement and anti-skid aggregate were analyzed using SEM-EDX. The wear on the road pavement...

  12. The shakeout scenario: Meeting the needs for construction aggregates, asphalt, and concrete

    Science.gov (United States)

    Langer, W.H.

    2011-01-01

    An Mw 7.8 earthquake as described in the ShakeOut Scenario would cause significantdamage to buildings and infrastructure. Over 6 million tons of newly mined aggregate would be used for emergency repairs and for reconstruction in the five years following the event. This aggregate would be applied mostly in the form of concrete for buildings and bridges, asphalt or concrete for pavement, and unbound gravel for applications such as base course that goes under highway pavement and backfilling for foundations and pipelines. There are over 450 aggregate, concrete, and asphalt plants in the affected area, some of which would be heavily damaged. Meeting the increased demand for construction materials would require readily available permitted reserves, functioning production facilities, a supply of cement and asphalt, a source of water, gas, and electricity, and a trained workforce. Prudent advance preparations would facilitate a timely emergency response and reconstruction following such an earthquake. ?? 2011, Earthquake Engineering Research Institute.

  13. Concrete Block Pavements

    Science.gov (United States)

    1983-03-01

    1967, Cedergren 1974, Federal Highway .’,U .. V,47 -’":: 37 Administration 1980). Block pavements have essentially the same prob- lems with moisture...Vicksburg, Miss. Cedergren , H. R. 1974. Drainage of Highway and Airfield Pavements, John Wiley and Sons, New VOk. I Cement and Concrete Association

  14. Effects of cross-anisotropy and stress-dependency of pavement layers on pavement responses under dynamic truck loading

    Directory of Open Access Journals (Sweden)

    Rafiqul A. Tarefder

    2016-06-01

    Full Text Available Previous studies by the authors have determined pavement responses under dynamic loading considering cross-anisotropy in one layer only, either the cross-anisotropic viscoelastic asphalt concrete (AC layer or the cross-anisotropic stress-dependent base layer, but not both. This study evaluates pavement stress–strain responses considering cross-anisotropy in all layers, i.e. AC, base and subbase, using finite element modeling (FEM technique. An instrumented pavement section on Interstate I-40 near Albuquerque, New Mexico was used in ABAQUS framework as model geometry. Field asphalt cores were collected and tested in the laboratory to determine the cross-anisotropy (n-values defined by horizontal to vertical modulus ratio, and other viscoelastic parameters as inputs of the model incorporated through user defined material interface (UMAT functionality in ABAQUS. Field base and subbase materials were also collected and tested in the laboratory to determine stress-dependent nonlinear elastic model parameters, as inputs of the model, again incorporated through UMAT. The model validation task was carried out using field-measured deflections and strain values under falling weight deflectometer (FWD loads at the instrumented section. The validated model was then subjected to an actual truck loading for studying cross-anisotropic effects. It was observed that horizontal tensile strain at the bottom of the AC layer and vertical strains in all layers decreased with an increase in n-value of the asphalt layer, from n < 1 (anisotropy to n=1 (isotropy. This indicates that the increase in horizontal modulus caused the decrease in layer strains. It was also observed that if the base and subbase layers were considered stress-dependent instead of linear elastic unbound layers, the horizontal tensile strain at the bottom of the asphalt layer increased and vertical strains on top of the base and subbase also increased.

  15. Effects of cross-anisotropy and stress-dependency of pavement layers on pavement responses under dynamic truck loading

    Institute of Scientific and Technical Information of China (English)

    Rafiqul A. Tarefder; Mesbah U. Ahmed; Asifur Rahman

    2016-01-01

    Previous studies by the authors have determined pavement responses under dynamic loading consid-ering cross-anisotropy in one layer only, either the cross-anisotropic viscoelastic asphalt concrete (AC) layer or the cross-anisotropic stress-dependent base layer, but not both. This study evaluates pavement stressestrain responses considering cross-anisotropy in all layers, i.e. AC, base and subbase, using finite element modeling (FEM) technique. An instrumented pavement section on Interstate I-40 near Albu-querque, New Mexico was used in ABAQUS framework as model geometry. Field asphalt cores were collected and tested in the laboratory to determine the cross-anisotropy (n-values) defined by horizontal to vertical modulus ratio, and other viscoelastic parameters as inputs of the model incorporated through user defined material interface (UMAT) functionality in ABAQUS. Field base and subbase materials were also collected and tested in the laboratory to determine stress-dependent nonlinear elastic model pa-rameters, as inputs of the model, again incorporated through UMAT. The model validation task was carried out using field-measured deflections and strain values under falling weight deflectometer (FWD) loads at the instrumented section. The validated model was then subjected to an actual truck loading for studying cross-anisotropic effects. It was observed that horizontal tensile strain at the bottom of the AC layer and vertical strains in all layers decreased with an increase in n-value of the asphalt layer, from n<1 (anisotropy) to n ¼ 1 (isotropy). This indicates that the increase in horizontal modulus caused the decrease in layer strains. It was also observed that if the base and subbase layers were considered stress-dependent instead of linear elastic unbound layers, the horizontal tensile strain at the bottom of the asphalt layer increased and vertical strains on top of the base and subbase also increased.

  16. SIMULATION OF TEMPERATURE AND TRANSPORT LOAD IMPACT ON FORMATION AND DEVELOPMENT OF CRACKS ON ASPHALT-CONCRETE ROAD SURFACES

    Directory of Open Access Journals (Sweden)

    I. Melnikova

    2012-01-01

    Full Text Available An analysis of statistical data has shown that about 60 % of all types of road surface destructions and damages in the Republic of Belarus are attributed to cracks (separate, frequent and cracks network. The process of cracks formation in the asphalt concrete pavement is rather complicated and it is affected by a number of factors. The most important and determining factors are character and value of traffic loads, temperature action, road pavement structure, properties of materials used for its layers. Some regularities of the cracks formation and development in the asphalt-concrete layers of the pavement have been established on the basis of the physical and mathematical modeling. Application of a finite  element  method for  calculations  has made it possible to determine  numerical values of compressive and tensile stresses arising due to temperature action and traffic load, deflection of road pavement constructive layers. The paper contains recommendations for a road pavement design and repair of asphalt-concrete pavements which have been made on the basis of the obtained data analysis.

  17. Spills on Flat Inclined Pavements

    Energy Technology Data Exchange (ETDEWEB)

    Simmons, Carver S.; Keller, Jason M.; Hylden, Jeff L.

    2004-03-01

    This report describes the general spill phenomenology for liquid spills occurring on relatively impermeable surfaces such as concrete or asphalt pavement and the development and application of a model to describe the time evolution of such spills. The discussion assumes evaporation and degradation are negligible and a homogeneous surface. In such an instance, the inherent interfacial properties determine the spatial extent of liquid spreading with the initial flow being controlled by the release rate of the spill and by the liquids resistance to flow as characterized by its viscosity. A variety of spill scenarios were simulated and successful implementation of the model was achieved. A linear relationship between spill area and spill volume was confirmed. The simulations showed spill rate had little effect on the final spill area. Slope had an insignificant effect on the final spill area, but did modify spill shape considerably. However, a fluid sink on the edge of the simulation domain, representing a storm drain, resulted in a substantial decrease in spill area. A bona fide effort to determine the accuracy of the model and its calculations remain, but comparison against observations from a simple experiment showed the model to correctly determine the spill area and general shape under the conditions considered. Further model verification in the form of comparison against small scale spill experiments are needed to confirm the models validity.

  18. An In-Depth Investigation into the Physicochemical, Thermal, Microstructural, and Rheological Properties of Petroleum and Natural Asphalts

    Directory of Open Access Journals (Sweden)

    Nader Nciri

    2016-10-01

    Full Text Available Over the last decade, unexpected and sudden pavement failures have occurred in several provinces in South Korea. Some of these failures remain unexplained, further illustrating the gaps in our knowledge about binder chemistry. To prevent premature pavement distress and enhance road performance, it is imperative to provide an adequate characterization of asphalt. For this purpose, the current research aims at inspecting the chemistry, microstructure, thermal, and physico-rheological properties of two types of asphalt, namely petroleum asphalt (PA and natural asphalt (NA. The binders were extensively investigated by using elemental analysis, thin-layer chromatography with flame ionization detection (TLC-FID, matrix-assisted laser desorption ionization time-of-fight mass spectroscopy (MALDI-TOF-MS, Fourier transform infrared spectroscopy (FT-IR, Raman spectroscopy (RS, Nuclear magnetic resonance spectroscopy (1H-NMR, ultraviolet and visible spectroscopy (UV-VIS, X-ray diffraction (XRD, scanning electron microscopy (SEM, thermogravimetric analysis (TGA, differential scanning calorimetry (DSC, penetration, softening point, ductility, and viscosity tests. The findings of this research have revealed the distinct variations between the chemical compositions, microstructures, and thermo-rheological properties of the two asphalts and provided valuable knowledge into the characteristics of the binders. Such insight has been effective in predicting the performance or distress of road pavement. This paper will, therefore, be of immediate interest to materials engineers in state highway agencies and asphalt industries.

  19. Predicting physical clogging of porous and permeable pavements

    Science.gov (United States)

    Yong, C. F.; McCarthy, D. T.; Deletic, A.

    2013-02-01

    SummaryPorous pavements are easily retrofitted, and effective in improving water quality and hydrology, but prone to clogging. Despite being a major determinant in the lifespan of porous pavements, there is limited information on the physical clogging processes through these systems. The aim of this study was to understand the main physical processes that govern physical clogging and develop a simple black-box model that predicts physical clogging. The key variables that were hypothesised to influence clogging were pavement design and climate characteristics. Two compressed time scale laboratory experiments were conducted over 3 years on three common porous pavement types; monolithic porous asphalt, modular Hydrapave and monolithic Permapave. Pavement design was found to be an important role in clogging. Permapave did not clog even after 26 years of operation in simulated sub-tropical Brisbane (Australia) climate while porous asphalt and Hydrapave clogged after just 12 years, from surface clogging and geotextile clogging, respectively. Each system was tested using two different dosing patterns: (1) continual wetting with no dry periods and (2) variable inflow rates with drying periods (i.e. representing more natural conditions). The latter dosing method approximately doubled the lifespan of all systems suggesting the influence of climate conditions on clogging. Clogging was found to be highly correlated with cumulative volume and flow rate. A simple black-box regression model that predicts physical clogging was developed as a function of cumulative volume and Brisbane climatic conditions. However it is very likely that the shape of this regression is general, and that it could be calibrated for different climates in the future.

  20. Performance evaluation of open-graded epoxy asphalt concrete with two nominal maximum aggregate sizes

    Institute of Scientific and Technical Information of China (English)

    罗桑; 钱振东; 薛永超

    2015-01-01

    Open-graded friction course (OGFC) is applied to pavement surfaces to increase driving safety under wet conditions, and recently, to reduce tire/pavement noise. The durability of OGFC, however, has been a concern since conventional OGFC mixes last typically less than ten years before major maintenance or rehabilitation is needed. This work investigates a new open-graded asphalt mixture that uses epoxy asphalt as binder to improve mix durability. One type of epoxy asphalt that has been successfully applied to dense-graded asphalt concrete for bridge deck paving was selected. A procedure of compacting the mix into slab specimens was developed and a series of laboratory tests were conducted to evaluate the performance of the new mix, including Cantabro loss, permeability, friction, shear strength, and wheel rutting tests. Results show superior overall performance of the open-graded epoxy asphalt mix compared to conventional open-graded asphalt mix. There are also preliminary indications that the OGFC mix with 4.75-mm NMAS gradation can improve the resistance performance to raveling, while the OGFC mix with 9.5-mm NMAS gradation can improve the performance of surface friction at a high slip speed.

  1. Performance evaluation of open-graded epoxy asphalt concrete with two nominal maximum aggregate sizes

    Institute of Scientific and Technical Information of China (English)

    罗桑; 钱振东; 薛永超

    2015-01-01

    Open-graded friction course(OGFC) is applied to pavement surfaces to increase driving safety under wet conditions, and recently, to reduce tire/pavement noise. The durability of OGFC, however, has been a concern since conventional OGFC mixes last typically less than ten years before major maintenance or rehabilitation is needed. This work investigates a new open-graded asphalt mixture that uses epoxy asphalt as binder to improve mix durability. One type of epoxy asphalt that has been successfully applied to dense-graded asphalt concrete for bridge deck paving was selected. A procedure of compacting the mix into slab specimens was developed and a series of laboratory tests were conducted to evaluate the performance of the new mix, including Cantabro loss, permeability, friction, shear strength, and wheel rutting tests. Results show superior overall performance of the open-graded epoxy asphalt mix compared to conventional open-graded asphalt mix. There are also preliminary indications that the OGFC mix with 4.75-mm NMAS gradation can improve the resistance performance to raveling, while the OGFC mix with 9.5-mm NMAS gradation can improve the performance of surface friction at a high slip speed.

  2. The Utilization of Graphene Oxide in Traditional Construction Materials: Asphalt

    Directory of Open Access Journals (Sweden)

    Wenbo Zeng

    2017-01-01

    Full Text Available In the advanced research fields of solar cell and energy storing materials, graphene and graphene oxide (GO are two of the most promising materials due to their high specific surface area, and excellent electrical and physical properties. However, they was seldom studied in the traditional materials because of their high cost. Nowadays, graphene and GO are much cheaper than before with the development of production technologies, which provides the possibility of using these extraordinary materials in the traditional construction industry. In this paper, GO was selected as a nano-material to modify two different asphalts. Then a thin film oven test and a pressure aging vessel test were applied to simulate the aging of GO-modified asphalts. After thermal aging, basic physical properties (softening point and penetration were tested for the samples which were introduced at different mass ratios of GO (1% and 3% to asphalt. In addition, rheological properties were tested to investigate how GO could influence the asphalts by dynamic shearing rheometer tests. Finally, some interesting findings and potential utilization (warm mixing and flame retardants of GO in asphalt pavement construction were explained.

  3. UTILIZATION OF WASTE PLASTIC BOTTLES IN ASPHALT MIXTURE

    Directory of Open Access Journals (Sweden)

    TAHER BAGHAEE MOGHADDAM

    2013-06-01

    Full Text Available Nowadays, large amounts of waste materials are being produced in the world. One of the waste materials is plastic bottle. Generating disposable plastic bottles is becoming a major problem in many countries. Using waste plastic as a secondary material in construction projects would be a solution to overcome the crisis of producing large amount of waste plastics in one hand and improving the structure’s characteristics such as resistance against cracking on the other hand. This study aimed to investigate the effects of adding plastic bottles in road pavement. Marshall properties as well as specific gravity of asphalt mixture containing different percentages of plastic bottles were evaluated. Besides, Optimum Asphalt Content (OAC was calculated for each percentages of plastic bottles used in the mix. The stiffness and fatigue characteristics of mixture were assessed at OAC value. Results showed that the stability and flow values of asphalt mixture increased by adding waste crushed plastic bottle into the asphalt mixture. Further, it was shown that the bulk specific gravity and stiffness of mixtures increased by adding lower amount of plastic bottles; however, adding higher amounts of plastic resulted in lower specific gravity and mix stiffness. In addition, it was concluded that the mixtures containing waste plastic bottles have lower OAC values compared to the conventional mixture, and this may reduce the amount of asphalt binder can be used in road construction projects. Besides, the mixtures containing waste plastic showed significantly greater fatigue resistance than the conventional mixture.

  4. Determination of Rheological Properties of Bio Mastic Asphalt

    Directory of Open Access Journals (Sweden)

    R. Muniandy

    2008-01-01

    Full Text Available Due to the high oil prices the price of asphalt binder has increased tremendously. This scenario has warranted demand for higher viscosity cheaper asphalt for pavement construction. A study was conducted to take advantage of the Empty Fruit Bunch (EFB of Date and Oil Palm trees (which are considered as waste to produce cellulose fiber to be used as additives in the asphalt binder. If these EFB's could be beneficially utilized in any application, it would reduce the load on the nation's landfills and at the same time reducing the cost of road construction. A total of 11 blends were prepared that consisted of 5 blends with date palm fiber, 5 blends with oil palm fiber and one control sample that contained no fibers. The samples were evaluated using Dynamic Shear Rheometer (DSR equipment in accordance with the superpave Strategic Highway Research Program (SHRP requirements. The neat asphalt binders (Unaged, Rolling Thin Film Oven (RTFO aged and Pressure Ageing Vessel (PAV samples were then measured for phase angle, shear strain and complex shear modulus and then evaluated in accordance with SHRP requirements. The results indicated that the fibers enhanced the rheological performance of Bio Mastic Asphalt (BMA blends. The control sample which was categorized as PG58 was enhanced to PG76 with 0.375% date palm fiber. The oil palm has also improved the blend up to PG70 with 0.3% oil palm fiber.

  5. Engineering characterisation of epoxidized natural rubber-modified hot-mix asphalt

    Science.gov (United States)

    Al-Mansob, Ramez A.; Ismail, Amiruddin; Yusoff, Nur Izzi Md.; Rahmat, Riza Atiq O. K.; Borhan, Muhamad Nazri; Albrka, Shaban Ismael; Azhari, Che Husna; Karim, Mohamed Rehan

    2017-01-01

    Road distress results in high maintenance costs. However, increased understandings of asphalt behaviour and properties coupled with technological developments have allowed paving technologists to examine the benefits of introducing additives and modifiers. As a result, polymers have become extremely popular as modifiers to improve the performance of the asphalt mix. This study investigates the performance characteristics of epoxidized natural rubber (ENR)-modified hot-mix asphalt. Tests were conducted using ENR–asphalt mixes prepared using the wet process. Mechanical testing on the ENR–asphalt mixes showed that the resilient modulus of the mixes was greatly affected by testing temperature and frequency. On the other hand, although rutting performance decreased at high temperatures because of the increased elasticity of the ENR–asphalt mixes, fatigue performance improved at intermediate temperatures as compared to the base mix. However, durability tests indicated that the ENR–asphalt mixes were slightly susceptible to the presence of moisture. In conclusion, the performance of asphalt pavement can be enhanced by incorporating ENR as a modifier to counter major road distress. PMID:28182724

  6. Engineering characterisation of epoxidized natural rubber-modified hot-mix asphalt.

    Science.gov (United States)

    Al-Mansob, Ramez A; Ismail, Amiruddin; Yusoff, Nur Izzi Md; Rahmat, Riza Atiq O K; Borhan, Muhamad Nazri; Albrka, Shaban Ismael; Azhari, Che Husna; Karim, Mohamed Rehan

    2017-01-01

    Road distress results in high maintenance costs. However, increased understandings of asphalt behaviour and properties coupled with technological developments have allowed paving technologists to examine the benefits of introducing additives and modifiers. As a result, polymers have become extremely popular as modifiers to improve the performance of the asphalt mix. This study investigates the performance characteristics of epoxidized natural rubber (ENR)-modified hot-mix asphalt. Tests were conducted using ENR-asphalt mixes prepared using the wet process. Mechanical testing on the ENR-asphalt mixes showed that the resilient modulus of the mixes was greatly affected by testing temperature and frequency. On the other hand, although rutting performance decreased at high temperatures because of the increased elasticity of the ENR-asphalt mixes, fatigue performance improved at intermediate temperatures as compared to the base mix. However, durability tests indicated that the ENR-asphalt mixes were slightly susceptible to the presence of moisture. In conclusion, the performance of asphalt pavement can be enhanced by incorporating ENR as a modifier to counter major road distress.

  7. ENHANCING ASPHALT RHEOLOGICAL BEHAVIOR AND AGING SUSCEPTIBILITY USING BIO-CHAR AND NANO-CLAY

    Directory of Open Access Journals (Sweden)

    Renaldo C. Walters

    2014-01-01

    Full Text Available The life expectancy of Asphalt Binder (AB has been negatively impacted by the harsh bombardment of UV rays. UV rays cause asphalt to oxidize faster, which results in deterioration of asphalt rheological characteristics that can lead to pavement distresses. This study investigates the impact of bio-char and nano-clay of asphalt rheological properties. Two nano scale materials were used for this study were nano-clay and bio-char. Nano-clay (Cloisite 30B is a naturally occurring inorganic mineral. Bio-char is the waste product from bio-binder production. Bio-binder is produced from swine manure using a thermochemical conversion process. This process is then followed by a filtration procedure where the bio-char is produced. Chemical and physical properties of bio-char showed a significant presence of carbon which could in turn enhance asphalt flow properties and reduce the rate of asphalt oxidation. In this study several mixtures are designed and evaluated using Rotational Viscometer testing (RV and X-Ray Diffraction (XRD. Nano-clay is blended at 2 and 4% by weight, with and without bio-binder (5% by weight of dry mass. Bio-char is grinded to nano scale and added to the virgin asphalt binder (PG 64-22 at 2, 5 and 10% by weight. The study results showed that introduction of nano-clay could be effective in reducing temperature susceptibility of asphalt binder.

  8. Pavement thickness and stabilised foundation layer assessment using ground-coupled GPR

    Science.gov (United States)

    Hu, Jinhui; Vennapusa, Pavana K. R.; White, David J.; Beresnev, Igor

    2016-07-01

    Experimental results from field and laboratory investigations using a ground-coupled ground penetrating radar (GPR), dielectric measurement, magnetic imaging tomography (MIT) and dynamic cone penetrometer (DCP) tests are presented. Dielectric properties of asphalt pavement and stabilised and unstabilised pavement foundation materials were evaluated in the laboratory in frozen and unfrozen conditions. Laboratory test results showed that dielectric properties of materials back-calculated from GPR in comparison to dielectric gauge measurements are strongly correlated and repeatable. For chemically stabilised materials, curing time affected the dielectric properties of the materials. Field tests were conducted on asphalt pavement test sections with different foundation materials (stabilised and unstabilised layers), drainage conditions and layer thicknesses. GPR and MIT results were used to determine asphalt layer thicknesses and were compared with measured core thicknesses, while GPR and DCP were used to assess foundation layer profiles. Asphalt thicknesses estimated from GPR showed an average error of about 11% using the dielectric gauge values as input. The average error reduced to about 4% when calibrated with cores thicknesses. MIT results showed thicknesses that are about 9% higher than estimated using GPR. Foundation layer thicknesses could not be measured using GPR due to variations in moisture conditions between the test sections, which is partly attributed to variations in gradation and drainage characteristics of the subbase layer.

  9. 浅谈高速公路路面病害及处理对策%On the Expressway Pavement Diseases and Treatment Measures

    Institute of Scientific and Technical Information of China (English)

    梁群暹

    2012-01-01

    This paper analyzed the causes of asphalt pavement disease, introduced the ways to deal with the diseases in the asphalt pavement from design, materials matching, disease treatment, quality control, and other aspects, and pointed out that good maintenance management was important measures to eliminate the asphalt pavement disease.%本文分析了高速公路沥青路面病害原因,介绍了在沥青路面病害修复中,如何从设计、材料选配、病害处治、质量控制等方面对路面病害处理,指出做好路面养护管理工作是消灭高速公路沥青路面病害的重要措施.

  10. Relation Between PAHs and Coal-Tar-Based Pavement Sealant in Urban Environments (Invited)

    Science.gov (United States)

    Mahler, B. J.; van Metre, P. C.

    2010-12-01

    Since 2003, coal-tar-based sealant products have come under increased scrutiny as a source of PAHs in urban environments. Sealant (or sealcoat) is the black, shiny substance often applied to asphalt pavement, in particular parking lots and driveways, for esthetic and maintenance purposes. Coal-tar-based sealant, one of the two primary pavement sealant types on the market, typically is 20-35 percent coal-tar pitch, a known carcinogen that is more than 50 percent polycyclic aromatic hydrocarbons (PAHs). The PAH content of the coal-tar-based sealant product is about 1,000 times that of a similar, asphalt-based product, on average. This difference is reflected in regional differences in sealant use and PAH concentrations in pavement dust. In the central and eastern U.S., where the coal-tar-based formulation is prevalent, ΣPAH in mobile particles from sealed pavement have been shown to be about 1,000 times higher than in the western U.S., where the asphalt-based formulation is prevalent (the median ΣPAH concentrations are 2,200 mg/kg in the central and eastern U.S. and 2.1 mg/kg in the western U.S.). Source apportionment modeling indicates that, in the central and eastern U.S., particles from sealed pavement are contributing the majority of the PAHs in recently deposited (post-1990) lake sediment, with implications for ecological health, and that coal-tar-based sealant is the primary cause of upward trends in PAHs in U.S. urban lakes. From the standpoint of human health, research indicates that mobile particles from parking lots with coal-tar-based sealant are tracked indoors, resulting in elevated PAH concentrations in house dust. Coal-tar-based sealcoat being applied to an asphalt parking lot at the University of Texas Pickle Research Center.

  11. Three Permeable Pavements Performances for Priority Metal Pollutants and Metals associated with Deicing Chemicals from Edison Parking Lot, NJ - abstract

    Science.gov (United States)

    The U.S. Environmental Protection Agency constructed a 4000-m2 parking lot in Edison, New Jersey in 2009. The parking lot is surfaced with three permeable pavements [permeable interlocking concrete pavers (PICP), pervious concrete (PC), and porous asphalt (PA)]. Samples of each p...

  12. Three Permeable Pavements Performances for Priority Metal Pollutants and Metals Associated with Deicing Chemicals from Edison Parking Lot, NJ

    Science.gov (United States)

    The U.S. Environmental Protection Agency constructed a 4000-m2 parking lot in Edison, New Jersey in 2009. The parking lot is surfaced with three permeable pavements [permeable interlocking concrete pavers (PICP), pervious concrete (PC), and porous asphalt (PA)]. Samples of each p...

  13. Cost-benefit analysis of the construction of different flexible pavement structures considering the axle load and type of binder

    Directory of Open Access Journals (Sweden)

    Lucas Dotto Bueno

    2016-08-01

    Full Text Available The status of Brazilian highways reflects a deficient pavement performance when they are subjected to loadings imposed by heavy traffic. Current legislation, as enacted by Contran (National Traffic Council, has increased the axle weight limit for cargo vehicles by up to 10%. Therefore, the aim of this study was to determine a cost-benefit ratio by using different types of structures, asphalt binders and load intensities. Typical pavements were determined and then analyzed by the software AEMC (SisPav to obtain the horizontal tensile strain (εt values at the bottom of the asphalt concrete layer and, later, the NFATIGUE value. It was found that the increase in weight, within values covered by legislation, might result in a reduction of approximately 50% in the NFATIGUE value for the pavement structures analyzed. As for economic impact, the same weight increase caused a mean increase of 120% in the cost of repeated loading on pavement structures (R$ NFATIGUE-1. It was also observed that structures with more robust asphalt concrete layers can provide the best R$ NFATIGUE-1 ratios. The best results for granular materials were found with thinner layers, associated with a thicker coating. The benefits of modified binders were shown by the analyses of the best structural options: both the polymer-modified binder and the rubber asphalt binder offer significant structural and economic improvements to the structure.

  14. Preliminary evaluation of the lifecycle costs and market barriers of reflective pavements

    Energy Technology Data Exchange (ETDEWEB)

    Ting, M.; Koomey, J.G.; Pomerantz, M.

    2001-11-21

    The objective of this study is to evaluate the life cycle costs and market barriers associated with using reflective paving materials in streets and parking lots as a way to reduce the urban heat island effect. We calculated and compared the life cycle costs of conventional asphalt concrete (AC) pavements to those of other existing pavement technologies with higher reflectivity-portland cement concrete (PCC), porous pavements, resin pavements, AC pavements using light-colored chip seals, and AC pavements using light-colored asphalt emulsion additives. We found that for streets and parking lots, PCC can provide a cost-effective alternative to conventional AC when severely damaged pavements must be completely reconstructed. We also found that rehabilitating damaged AC streets and intersections with thin overlays of PCC (ultra-thin white topping) can often provide a cost-effective alternative to standard rehabilitation techniques using conventional AC. Chip sealing is a common maintenance treatment for low-volume streets which, when applied using light-colored chips, could provide a reflective pavement surface. If the incremental cost of using light-colored chips is low, this chip sealing method could also be cost-effective, but the incremental costs of light-colored chips are as of yet uncertain and expected to vary. Porous pavements were found to have higher life cycle costs than conventional AC in parking lots, but several cost-saving features of porous pavements fell outside the boundaries of this study. Resin pavements were found to be only slightly more expensive than conventional AC, but the uncertainties in the cost and performance data were large. The use of light-colored additives in asphalt emulsion seal coats for parking lot pavements was found to be significantly more expensive than conventional AC, reflecting its current niche market of decorative applications. We also proposed two additional approaches to increasing the reflectivity of conventional AC

  15. Performance of Soft Asphalt and Double Otta Seal within First Three Years

    Directory of Open Access Journals (Sweden)

    Audrius Vaitkus

    2016-01-01

    Full Text Available Gravel roads play an important role in the transport infrastructure. However, their maintenance (especially the control of dustiness using chemical dust suppressants is expensive. Besides, the condition of gravel roads results in low driving comfort, longer travelling time, faster vehicle amortization, and so forth. Typically, these problems are solved by paving gravel roads with asphalt wearing layer. However, north countries practice had shown pavement structure high susceptibility to frost due to insufficient thickness of frost resistance layer. The construction of thicker frost resistant layer increases road construction cost by 25% and, in most cases, there is no need to increase bearing capacity by increasing total thickness of pavement structure. In 2012 19 gravel roads were constructed using cost effective rehabilitation technologies—soft asphalt and double Otta Seal in Lithuania. This paper focuses on those two technologies’ performance within first three years of constructed roads exploitation. The implemented experimental research consisted of three parts by evaluating constructed roads base layers bearing capacity; pavement roughness; and pavement distresses and defects. As a result, the acceptable performance indicators were determined for both technologies—soft asphalt and double Otta Seal. Also recommendations for construction and exploitation improvement were defined.

  16. Evaluation of plant-produced porous warm-mix asphalt mixture using LEADCAP additive

    Institute of Scientific and Technical Information of China (English)

    KIM Yongjoo; CHO Dongwoo; YANG Sunglin; KIM Yeongmin; KWON Sooahn; HWANG Sungdo

    2013-01-01

    Warm-mix asphalt (WMA) technology was applied for asphalt mixture,plant-produced porous WMA using LEADCAP additive (porous WMA-LEADCAP) test section was built and compacted at 30 ℃lower than porous hot-mix asphalt (porous HMA) test section.Marshall mix designs were conducted for porous WMA-LEADCAP mixture and porous HMA mixture in terms of Marshall stability,Cantabro loss and dynamic stability.The workability,compactablity and surface quality of porous WMA-LEADCAP pavement were investigated,and the engineering properties of plant-produced porous WMA-LEADCAP mixture and plant-produced porous HMA mixture were evaluated based on indirect tensile strength test and dynamic immersion test.Analysis result shows that LEADCAP additive does not affect polymermodified asphalt in terms of penetration,softening point,viscosity,ductility,toughness and tenacity.Porous WMA-LEADCAP pavement has similar field density,permeability and smoothness compared with standard porous HMA pavement.Plant-produced porous WMA-LEADCAP mixture is equivalent to plantproduced porous HMA mixture in indirect tensile strength,toughness and stripping resistance.4 tabs,4 figs,9 refs.

  17. Determination of allowable subgrade frost heave with the pavement roughness index in numerical analysis

    Institute of Scientific and Technical Information of China (English)

    HongYan Ma; Feng Zhang; DeCheng Feng; Bo Lin

    2015-01-01

    Frost heave is an upward swelling of soil during cryogenic conditions in cold regions. It is caused by the accumulation of ice crystals in subgrade soil, which grow upwards when freezing temperatures penetrate into the subgrade. This study establishes the allowable soil subgrade frost heave based on the roughness standard of asphalt pavement in China, and aims to balance the pavement design and frost heave resistance of subgrades in cold regions. We formulated a mechanical model of pavement supported by the boundary conditions of differential frost heave, based on the elastic layered system theory. The differential soil subgrade frost heave was modeled as a sinusoidal function, and the allowable frost heave and the roughness index were modeled as the displacement boundaries for the top and bottom of the pavement structure. Then the allowable frost heave was back-calculated according to the roughness standard. Numerical results show that the allowable frost heave depends on the pavement structure, material properties, the highway grade, and other factors. In order to ensure that the actual soil subgrade frost heave is lower than the allowable frost heave, pavement structures and materials need to be selected and designed carefully. The numerical method proposed here can be applied to establish the frost heave re-sistance of subgrade when the pavement structure and materials are determined.

  18. Nutrient infiltrate concentrations from three permeable pavement types.

    Science.gov (United States)

    Brown, Robert A; Borst, Michael

    2015-12-01

    While permeable pavement is increasingly being used to control stormwater runoff, field-based, side-by-side investigations on the effects different pavement types have on nutrient concentrations present in stormwater runoff are limited. In 2009, the U.S. EPA constructed a 0.4-ha parking lot in Edison, New Jersey, that incorporated permeable interlocking concrete pavement (PICP), pervious concrete (PC), and porous asphalt (PA). Each permeable pavement type has four, 54.9-m(2), lined sections that direct all infiltrate into 5.7-m(3) tanks enabling complete volume collection and sampling. This paper highlights the results from a 12-month period when samples were collected from 13 rainfall/runoff events and analyzed for nitrogen species, orthophosphate, and organic carbon. Differences in infiltrate concentrations among the three permeable pavement types were assessed and compared with concentrations in rainwater samples and impervious asphalt runoff samples, which were collected as controls. Contrary to expectations based on the literature, the PA infiltrate had significantly larger total nitrogen (TN) concentrations than runoff and infiltrate from the other two permeable pavement types, indicating that nitrogen leached from materials in the PA strata. There was no significant difference in TN concentration between runoff and infiltrate from either PICP or PC, but TN in runoff was significantly larger than in the rainwater, suggesting meaningful inter-event dry deposition. Similar to other permeable pavement studies, nitrate was the dominant nitrogen species in the infiltrate. The PA infiltrate had significantly larger nitrite and ammonia concentrations than PICP and PC, and this was presumably linked to unexpectedly high pH in the PA infiltrate that greatly exceeded the optimal pH range for nitrifying bacteria. Contrary to the nitrogen results, the PA infiltrate had significantly smaller orthophosphate concentrations than in rainwater, runoff, and infiltrate from PICP

  19. Research on construction technology for orthotropic steel deck pavement of Haihe River Chunyi Bridge

    Science.gov (United States)

    Xue, Y. C.; Qian, Z. D.; Zhang, M.

    2017-01-01

    In order to ensure the good service quality of orthotropic steel deck pavement of Haihe River Chunyi Bridge in Tianjin, and to reduce the occurrence of pavement diseases like lateral and longitudinal cracks, the key working procedures such as steel deck cleaning, anticorrosive coating, bonding layer spraying, seam cutting, epoxy asphalt concrete’s mixing, transportation, paving and compaction were studied. The study was based on the main features of epoxy asphalt concrete which is the pavement materials of Haihe River Chunyi Bridge, and combined with the basic characteristics and construction conditions of Haihe River Chunyi Bridge. Furthermore, some processing measures like controlling time and temperature, continuous paving with two pavers, lateral feeding, and improving the compaction method were proposed. The project example shows that the processing measures can effectively solve the technical difficulties in the construction of orthotropic steel deck pavement of Haihe River Chunyi Bridge, can greatly improve the construction speed and quality, and can provide reference for the same kinds of orthotropic steel deck pavement construction.

  20. Life Cycle Assessment of Pavements: A Critical Review of Existing Literature and Research

    Energy Technology Data Exchange (ETDEWEB)

    Santero, Nicholas; Masanet, Eric; Horvath, Arpad

    2010-04-20

    This report provides a critical review of existing literature and modeling tools related to life-cycle assessment (LCA) applied to pavements. The review finds that pavement LCA is an expanding but still limited research topic in the literature, and that the existing body of work exhibits methodological deficiencies and incompatibilities that serve as barriers to the widespread utilization of LCA by pavement engineers and policy makers. This review identifies five key issues in the current body of work: inconsistent functional units, improper system boundaries, imbalanced data for asphalt and cement, use of limited inventory and impact assessment categories, and poor overall utility. This review also identifies common data and modeling gaps in pavement LCAs that should be addressed in future work. These gaps include: the use phase (rolling resistance, albedo, carbonation, lighting, leachate, and tire wear and emissions), asphalt fumes, feedstock energy of bitumen, traffic delay, the maintenance phase, and the end-of-life phase. This review concludes with a comprehensive list of recommendations for future research, which shed light on where improvements in knowledge can be made that will benefit the accuracy and comprehensiveness of pavement LCAs moving forward.

  1. Assessment of the Remaining Life of Bituminous Layers in Road Pavements

    Directory of Open Access Journals (Sweden)

    Kálmán Adorjányi

    2017-02-01

    Full Text Available In this paper, a mechanistic-empirical approach is presented for the assessment of bearing capacity condition of asphalt pavement layers by Falling Weight Deflectometer measurements and laboratory fatigue tests. The bearing capacity condition ratio was determined using past traffic data and the remaining fatigue life which was determined from multilayer pavement response model. The traffic growth rate was taken into account with finite arithmetic and geometric progressions. Fatigue resistance of layers’ bituminous materials was obtained with indirect tensile fatigue tests. Deduct curve of condition scores was derived with Weibull distribution.

  2. G4高速公路湖南耒宜段大修工程路面结构方案设计%Pavement Structure Design of LeiYi Expressway Overhaul Engineering

    Institute of Scientific and Technical Information of China (English)

    吴超凡; 黄治湘; 张继森

    2014-01-01

    This paper introduces the original variety of Leiyi Expressway pavement structure,traf-fic flow and pavement damage.According to the pavement structure specific,traffic flow and axle load disparity of the road,using a technical and economical comparison,the original continuous reinforced concrete pavement overlay asphalt concrete pavement structure,the original ordinary cement concrete and reinforced concrete pavement overlay continuously reinforced concrete composite pavement,milling and overlay single or bunk asphalt pavement layer on the original asphalt pavement,the original asphalt pave-ment overlay situ thermal regeneration after single and double bituminous surface layer structure.%介绍了耒宜高速公路原路面的多种路面结构与交通流量及路面损害情况,针对具体的路面结构与左右幅交通流量与轴载的悬殊差异,经技术经济比较,采用了在原连续配筋混凝土路面上直接加铺沥青混凝土路面结构;在原普通水泥混凝土与钢筋混凝土路面上加铺连续配筋混凝土复合式路面;在原沥青路面上进行铣刨加铺单层沥青面层与双层沥青面层、对原沥青路面进行就地热再生后加铺单层与双层沥青面层结构。

  3. Effects of Nominal Maximum Aggregate Size on the Performance of Stone Matrix Asphalt

    Directory of Open Access Journals (Sweden)

    Hongying Liu

    2017-01-01

    Full Text Available It is well known that the performance of hot mix asphalt (HMA in service life is closely related to a proper aggregate gradation. A laboratory study was conducted to investigate the effects of nominal maximum aggregate size (NMAS on the performance of stone matrix asphalt (SMA. The volumetric characteristics and performance properties obtained from wheel tracking tests, permeability test, beam bending test, contabro test are compared for SMA mixes with different NMAS. The results indicated that voids in mineral aggregate (VMA and voids filled with asphalt (VFA of SMA mixtures increased with a decrease of aggregate size in aggregate gradation. SMA30 had the lowest optimum asphalt content among all the mixtures. Increase of NMAS contributed to improvement of the rutting resistance of SMA mixtures. However, a decrease of NMAS showed better cracking and raveling resistance. Permeability rate of SMA was primarily affected by the air voids (AV and break point sieve, but was also sensitive to aggregate gradation to some extent, with reduced NMAS corresponding to less permeability rate. Based on the test results, SMA5 and SMA13 are suggested to be used as a water-proof layer in bridge deck pavement, and SMA20 and SMA30 are suggested to be used as binder course in asphalt pavement, which needs to possess superior rutting resistance at high temperature.

  4. Influence of Diatomite and Mineral Powder on Thermal Oxidative Ageing Properties of Asphalt

    Directory of Open Access Journals (Sweden)

    Yongchun Cheng

    2015-01-01

    Full Text Available Ageing of asphalt affects the performances of asphalt pavement significantly. Therefore, effects of diatomite and mineral powder on ageing properties of asphalt were investigated systematically in order to improve the antiageing property of mixture. Thin film oven test (TFOT was used to conduct the short term ageing in laboratory. Softening points, penetrations, force ductility, low temperature creep properties, and viscosities of asphalt mastics were tested before and after TFOT, respectively. Results indicated that percent retained penetration (PRP increased with the increasing of fillers. Increment of softening point (ΔT, ductility retention rate (DRR, deformation energy ageing index (JAI, and viscosity ageing index (VAI of asphalt mastics nonlinearly decreased with the increasing of fillers. Ageing of asphalt was reduced by diatomite and mineral powder. And the antiageing effect of diatomite was better than that of mineral powder as a result of its porous structure. It is suggested that the mineral powder could be reasonably replaced by diatomite in order to reduce thermal oxidative ageing of asphalt mixture. The optimal content of diatomite 12.8% is also suggested for engineering.

  5. Use of Hydrogen from Renewable Energy Source for Powering Hot-Mix Asphalt Plant

    Directory of Open Access Journals (Sweden)

    Kasthurirangan Gopalakrishnan

    2012-03-01

    Full Text Available A significant portion of paved roads and highways are surfaced with Hot-Mix Asphalt. Environmental Life-Cycle Assessment studies have shown that, in the production of Hot-Mix Asphalt pavements, major consumption of energy takes place during asphalt mixing and drying of aggregates, more than what is consumed during the extraction of crude oil and the distillation of bitumen. Currently, natural gas is the primarily source of fossil fuel used to produce 70 to 90 percent of the Hot-Mix Asphalt in the USA, while the remainder of the Hot-Mix Asphalt is produced using oil, propane, waste oil, or other fuels. Energy-related CO2 emissions resulting from the use of fossil fuels in various industry and transportation sectors represent a significant portion of human-made greenhouse gas emissions. This study investigates the technical feasibility of using a hybrid wind energy system as a clean source of energy for operating an entire Hot-Mix Asphalt production facility. Since wind blows intermittently, the extracted wind energy will be stored in the form of hydrogen which is considered a lightweight, compact energy carrier, for later use, thus creating a ready source of electricity for the Hot-Mix Asphalt plant when wind is not present or when electricity demand is high.

  6. Performance Prediction of the NCAT Test Track Pavements Using Mechanistic Models

    Science.gov (United States)

    LaCroix, Andrew Thomas

    In the pavement industry in the United States of America, there is an increasing desire to improve the pavement construction quality and life for new and rehabilitated pavements. In order to improve the quality of the pavements, the Federal Highway Administration (FHWA) has pursued a performance-related specification (PRS) for over 20 years. The goal of PRS is to provide material and construction (M/C) properties that correlate well with pavement performance. In order to improve upon the PRS projects developed in WesTrack (NCHRP 9-20) and the MEPDG-based PRS (NCHRP 9-22), a set of PRS tests and models are proposed to provide a critical link between pavement performance and M/C properties. The PRS testing is done using the asphalt mixture performance tester (AMPT). The proposed PRS focuses on rutting and fatigue cracking of asphalt mixtures. The mixtures are characterized for their stiffness, fatigue behavior, and rutting resistance using a dynamic modulus (|E*|) test, a fatigue test, and a triaxial stress sweep (TSS) test, respectively. Information from the fatigue test characterizes the simplified viscoelastic continuum damage (S-VECD) model. Once the stiffness is reduced to a certain level, the material develops macro-cracks and fails. The TSS test is used to characterize a viscoplastic (VP) model. The VP model allows the prediction of the rut depth beneath the center of the wheel. The VECD and VP models are used within a layered viscoelastic (LVE) pavement model to predict fatigue and rutting performance of pavements. The PRS is evaluated by comparing the predictions to the field performance at the NCAT pavement test track in Opelika, Alabama. The test track sections evaluated are part of the 2009 test cycle group experiment, which focused on WMA, high RAP (50%), and a combination of both. The fatigue evaluation shows that all sections would last at least 18 years at the same traffic rate. The sections do not show any cracking, suggesting the sections are well

  7. Assessment of Asphalt Concrete Reinforcement Grid in Flexible Pavements

    Science.gov (United States)

    2016-05-01

    consistently reached the maxi - mum 100 CBR, or the equivalent of a crushed limestone material. ERDC/CRREL TR-16-7 27 The depth of DCP penetration...appeared to be a weak correlation between the ISM value and the presence of grid reinforcement in the test sections. This relationship did not

  8. Anomalies detection in asphalt pavements: a morphological image processing approach

    Directory of Open Access Journals (Sweden)

    Diego Buchinger

    2014-04-01

    Full Text Available O sistema terrestre de transporte possui grande influência na vida moderna, mas a manutenção de cada quilômetro da rede rodoviária é uma tarefa difícil, dada a sua extensão. A avaliação das condições de estradas pode ser um trabalho cansativo se realizado sem auxílio computacional automatizado; por isso, sistemas semiautomatizados de análise de estradas foram criados. Neste artigo, um novo algoritmo baseado em visão para detecção de anomalias, tais como buracos e rachaduras, é proposto, usando processamento morfológico de imagens, baseado no conceito estatístico de intervalos de confiança. O algoritmo foi testado com 186 fotos, que foram pré-processadas por um algoritmo de segmentação de estradas, utilizando intervalos de confiança entre 0,1% e 10,0%. O melhor valor encontrado para o intervalo de confiança foi de 4% para cenários controlados – onde não há automóveis andando pela rua e não há sombreamento significativo – resultando numa acurácia de 84,00%, precisão de 75,68% e exatidão de 90,32%.

  9. Mechanics based model for predicting structure-induced rolling resistance (SRR) of the tire-pavement system

    Science.gov (United States)

    Shakiba, Maryam; Ozer, Hasan; Ziyadi, Mojtaba; Al-Qadi, Imad L.

    2016-11-01

    The structure-induced rolling resistance of pavements, and its impact on vehicle fuel consumption, is investigated in this study. The structural response of pavement causes additional rolling resistance and fuel consumption of vehicles through deformation of pavement and various dissipation mechanisms associated with inelastic material properties and damping. Accurate and computationally efficient models are required to capture these mechanisms and obtain realistic estimates of changes in vehicle fuel consumption. Two mechanistic-based approaches are currently used to calculate vehicle fuel consumption as related to structural rolling resistance: dissipation-induced and deflection-induced methods. The deflection-induced approach is adopted in this study, and realistic representation of pavement-vehicle interactions (PVIs) is incorporated. In addition to considering viscoelastic behavior of asphalt concrete layers, the realistic representation of PVIs in this study includes non-uniform three-dimensional tire contact stresses and dynamic analysis in pavement simulations. The effects of analysis type, tire contact stresses, pavement viscoelastic properties, pavement damping coefficients, vehicle speed, and pavement temperature are then investigated.

  10. Integrated coke, asphalt and jet fuel production process and apparatus

    Science.gov (United States)

    Shang, Jer Y.

    1991-01-01

    A process and apparatus for the production of coke, asphalt and jet fuel m a feed of fossil fuels containing volatile carbon compounds therein is disclosed. The process includes the steps of pyrolyzing the feed in an entrained bed pyrolyzing means, separating the volatile pyrolysis products from the solid pyrolysis products removing at least one coke from the solid pyrolysis products, fractionating the volatile pyrolysis products to produce an overhead stream and a bottom stream which is useful as asphalt for road pavement, condensing the overhead stream to produce a condensed liquid fraction and a noncondensable, gaseous fraction, and removing water from the condensed liquid fraction to produce a jet fuel-containing product. The disclosed apparatus is useful for practicing the foregoing process. the process provides a useful method of mass producing and jet fuels from materials such as coal, oil shale and tar sands.

  11. Pavement Snow Melting

    Energy Technology Data Exchange (ETDEWEB)

    Lund, John W.

    2005-01-01

    The design of pavement snow melting systems is presented based on criteria established by ASHRAE. The heating requirements depends on rate of snow fall, air temperature, relative humidity and wind velocity. Piping materials are either metal or plastic, however, due to corrosion problems, cross-linked polyethylene pipe is now generally used instead of iron. Geothermal energy is supplied to systems through the use of heat pipes, directly from circulating pipes, through a heat exchanger or by allowing water to flow directly over the pavement, by using solar thermal storage. Examples of systems in New Jersey, Wyoming, Virginia, Japan, Argentina, Switzerland and Oregon are presented. Key words: pavement snow melting, geothermal heating, heat pipes, solar storage, Wyoming, Virginia, Japan, Argentina, Klamath Falls.

  12. A Novel Method for Evaluating Fatigue Properties of Bonding Layers Used in Bridge Deck Pavement

    Institute of Scientific and Technical Information of China (English)

    ZHOU Jie; WU Shaopeng; HAN Jun; LIU Gang; ZHANG Guang

    2009-01-01

    A new method was used to evaluate the fatigue properties of the bonding layer used in the bridge deck pavement. The shear fatigue test of three bonding layers was conducted on a dy-namic shear rheometer(DSR). The fatigue formulas were gained for these layers. The experimental results indicate that, at the same torque level or at the same frequency, neoprene latex asphalt bonding layer exhibits excellent fatigue performance when compared to other two bonding layers.

  13. Thermal behavior of crumb-rubber modified asphalt concrete mixtures

    Science.gov (United States)

    Epps, Amy Louise

    Thermal cracking is one of the primary forms of distress in asphalt concrete pavements, resulting from either a single drop in temperature to an extreme low or from multiple temperature cycles above the fracture temperature of the asphalt-aggregate mixture. The first mode described is low temperature cracking; the second is thermal fatigue. The addition of crumb-rubber, manufactured from scrap tires, to the binder in asphalt concrete pavements has been suggested to minimize both types of thermal cracking. Four experiments were designed and completed to evaluate the thermal behavior of crumb-rubber modified (CRM) asphalt-aggregate mixtures. Modified and unmodified mixture response to thermal stresses was measured in four laboratory tests. The Thermal Stress Restrained Specimen Test (TSRST) and the Indirect Tensile Test (IDT) were used to compare mixture resistance to low temperature cracking. Modified mixtures showed improved performance, and cooling rate did not affect mixture resistance according to the statistical analysis. Therefore results from tests with faster rates can predict performance under slower field rates. In comparison, predicted fracture temperatures and stresses (IDT) were generally higher than measured values (TSRST). In addition, predicted fracture temperatures from binder test results demonstrated that binder testing alone is not sufficient to evaluate CRM mixtures. Thermal fatigue was explored in the third experiment using conventional load-induced fatigue tests with conditions selected to simulate daily temperature fluctuations. Test results indicated that thermal fatigue may contribute to transverse cracking in asphalt pavements. Both unmodified and modified mixtures had a finite capacity to withstand daily temperature fluctuations coupled with cold temperatures. Modified mixtures again exhibited improved performance. The fourth experiment examined fracture properties of modified and unmodified mixtures using a common fracture toughness test

  14. DRAINAGE AND FLEXIBLE PAVEMENT PERFORMANCE

    Directory of Open Access Journals (Sweden)

    SIDDHARTHA ROKADE

    2012-04-01

    Full Text Available Providing adequate drainage to a pavement system has been considered as an important design consideration to prevent premature failures due to water related problems such as pumping action, loss of support, and rutting, among others. Most water in pavements is due to rainfall infiltration into unsaturated pavement layers, throughjoints, cracks, shoulder edges, and various other defects, especially in older deteriorated pavements. Water also seep upward from a high groundwater table due to capillary suction or vapour movements, or it may flow laterally from the pavement edges and side ditches. Providing adequate drainage to a pavement system has been considered as an important design consideration to ensure satisfactory performance of the pavement, particularly from the perspective of life cycle cost and serviceability. To minimize premature pavement distresses and to enhance the pavement performance, it is imperative to provide adequate drainage to allow infiltrated water to drain out from the base and sub-base, thus avoiding saturation of base and subgrade soils. This paper deals with the analysis of the impact of subsurface drainage on pavement system performance. The requirement ofeffective subsurface drainage for pavement performance is also discussed.

  15. Pavement Sealcoat, PAHs, and Water Quality of Urban Water Bodies: An Overview

    Science.gov (United States)

    Mahler, B. J.; Van Metre, P. C.; Ingersoll, C.; Kunz, J. L.; Kienzler, A.; Devaux, A.; Bony, S.

    2014-12-01

    Coal-tar-based (CT) sealcoat is used to protect and beautify the asphalt pavement of driveways and parking lots primarily in the central, southern, and northeastern U.S. and in Canada. CT sealcoat typically is 20 to 35 percent crude coal tar or coal-tar pitch and contains from 50,000 to 100,000 mg/kg PAHs, about 1,000 times more than asphalt-based (AS) sealcoat or asphalt itself. Tires and snowplows abrade the friable sealcoat surface into fine particles—PAH concentrations in fine particles (dust) from CT-sealcoated pavement are about 1,000 times higher than in dust from AS-sealcoated pavement (median total PAH concentrations 2,200 and 2.1 mg/kg, respectively). Use of CT sealcoat has several implications for urban streams and lakes. Source apportionment modeling has indicated that, in regions where CT sealcoat is prevalent, particles from sealcoated pavement are contributing the majority of the PAHs to recently deposited lake sediment, with implications for ecological health. Acute 2-d toxicity of runoff from CT-sealcoated pavement to stream biota, demonstrated for a cladoceran (Ceriodaphnia dubia) and fathead minnows (Pimephales promelas), continues for samples collected as long as weeks or months following sealcoat application. Using the fish-liver cell line RGL-W1, runoff collected as much as 36 days following CT-sealcoat application has been demonstrated to cause DNA damage and impair DNA repair capacity. These results demonstrate that CT runoff is a potential hazard to aquatic ecosystems for at least several weeks after sealant application, and that exposure to sunlight can enhance toxicity and genetic damage. Recent research has provided direct evidence that restricting use of CT sealcoat in a watershed can lead to a substantial reduction in PAH concentrations in receiving water bodies.

  16. Implications of Use of Coal-Tar-Based Pavement Sealcoat on Urban Water Quality

    Science.gov (United States)

    Van Metre, P. C.

    2015-12-01

    Coal-tar-based (CT) sealcoat is used to protect and improve the appearance of asphalt pavement of driveways and parking lots primarily in the central and eastern U.S. and in Canada. CT sealcoat typically is 20 to 35% crude coal tar or coal-tar pitch and contains from 50,000 to 100,000 mg/kg polycyclic aromatic hydrocarbons (PAH), about 1,000 times more than asphalt-based (AS) sealcoat or asphalt itself. Tires and snowplows abrade the friable sealcoat surface into fine particles—median total PAH concentrations in dust from CT-sealcoated pavement are 2,200 mg/kg compared to a median concentration of 11 mg/kg for dust from unsealed pavement. Use of CT sealcoat has several implications for urban streams and lakes. Source apportionment modeling has indicated that, in regions where CT sealcoat is prevalent, particles from sealcoated pavement are contributing the majority of the PAHs to recently deposited lake sediment, often resulting in sediment concentrations above toxicity thresholds based on effects-based sediment quality guidelines. Acute 2-day laboratory toxicity testing of simulated runoff from CT-sealcoated pavement to a cladoceran (Ceriodaphnia dubia) and fathead minnows (Pimephales promelas) demonstrated that toxicity continues for samples collected for weeks or months following sealcoat application and that toxicity is enhanced by exposure to UV light. Using the fish-liver cell line RTL-W1, runoff collected as much as 36 days following CT-sealcoat application has been demonstrated to cause DNA damage and impair DNA repair capacity. These results demonstrate that CT runoff is a potential hazard to aquatic ecosystems and that exposure to sunlight can enhance toxicity and genetic damage. Recent research has provided direct evidence that restricting use of CT sealcoat in a watershed can lead to a substantial reduction in PAH concentrations in receiving water bodies.

  17. Numerical Investigation of Design Strategies to Achieve Long-Life Pavements

    CERN Document Server

    Ghauch, Ziad G

    2011-01-01

    Increasing the HMA base thickness and modifying the HMA mixture properties to improve the resistance to fatigue cracking are among the most popular methods for achieving long-lasting pavements. Such methods are based on the idea of reducing the tensile strain at the bottom of the HMA layer below the Fatigue Endurance Limit (FEL), a level of strain below which no cumulative damage occurs to the HMA mixture. This study investigates the effectiveness of several design strategies involved in long-life, perpetual pavement design. A 3D Finite Element model of the pavement involving a linear viscoelastic constitutive model for HMA materials and non-uniform tire contact stresses is developed using ABAQUS 6.11. The effects of asphalt base course thickness and mixture type, rich binder layer, and aggregate subbase layer are examined. Four asphalt base course mixture types, namely dense graded, polymer modified, high modulus, and standard binder, are studied as a function of the asphalt base course thickness. The result...

  18. Discussion on the Asphalt Mixing Equipment Status of Traffic Engineering Machinery%浅议交通工程机械沥青搅拌设备现状

    Institute of Scientific and Technical Information of China (English)

    李新亚

    2013-01-01

    In the construction of asphalt pavement, asphalt mixing machine is one of the most important construction equ-ipment, its application market has a large range in our country. This paper discusses the asphalt mixing equipment status.%  在沥青路面的施工中,沥青混合料搅拌机械是最为重要的施工设备,在我国有着大范围的应用市场。在文中将对公路施工沥青搅拌设备的现状进行讨论。

  19. Precast Concrete Pavements

    Science.gov (United States)

    1981-11-01

    Gorsuch 1962, Kruse 1966, Jacoby 1967, and Hargett 1970). The final slab design used in construction is shown in Figure 2. These slabs were 6 ft wide, 24...Experiment Station, CE, Vicksburg, Miss. Gorsuch , R. F. 1962. "Preliminary Investigation of Precast Prestressed Concrete Pavements," MS Thesis, South Dakota

  20. Effects of rejuvenator seal and fog seal on performance of open-graded friction course pavement

    Directory of Open Access Journals (Sweden)

    Nadeem A. Qureshi

    2013-05-01

    Full Text Available An open-graded friction course (OGFC is a special-purpose surface layer of hot-mix asphalt (HMA pavement that is increasingly being used around the world. Owing to its numerous benefits, OGFC is being regularly used as a final riding surface on interstate and high-traffic expressways by different highway agencies in the United States. However, some OGFC sections have experienced premature failure due to ravelling only after 6-8 years of service life. To maintain an effective, longer service life and enhanced performance of OGFC, preventive maintenance has been considered essential. There are several approaches to maintaining OGFC, one of which is the application of a fog seal and rejuvenator seal. A fog seal can reduce ravelling and extend the service life of OGFC while a rejuvenator seal can revitalise the existing aged asphalt binder in the top OGFC layer. This research focuses on optimising the fog and rejuvenator seal application rates by evaluating their effectiveness in terms of surface friction and durability. Three types of seal material were evaluated: Pavegaard (PG and Pavepreserve (PP asphalt rejuvenators and a cationic slow-setting asphalt emulsion (CSS-1H as a fog seal. Improvement in abrasion resistance of OGFC pavement was observed on application of fog and rejuvenator seals but surface friction was reduced to some extent. Hamburg test clearly shows a trend that the medium application rate of 0.10 gallon/square yard is better in enhancing resistance to rutting/moisture susceptibility of OGFC.

  1. Laboratory Investigation of Conventional Asphalt Mix Using Shell Thiopave for Indian Roads

    Directory of Open Access Journals (Sweden)

    Jayaprakash B

    2015-02-01

    Full Text Available The characteristic performance of asphalt pavement always depends on the properties of bitumen, volumetric properties of asphalt mixtures. Bitumen is visco– elastic material where the temperature and rate of load application have a great influence on its behavior. There are different solutions to reduce the pavement distress such as using Thiopave (binder extender and asphalt mixture modifier in the mix design. Thiopave can significantly alter the performance properties of the mix and it is helpful to extend the life span of pavement. In this study, investigating use of thiopave and the change in the performance properties is dependent both on the percentage of virgin binder using VG-30 bitumen that is substituted with thiopave with different percentages. The study indicated that 10%, 20%, 30% and 40% replacement of binder was done with thiopave. The most notable impact of the addition of thiopave to a bituminous mixture is an increase in the stiffness of the mixture for better resistance to fatigue cracking and rutting. Thiopave materials can have a positive impact on laboratory mixture performance. The addition of thiopave has been shown to significantly increase Marshall Stability. From this study it is observed that thiopave can be utilized up to 30% to 40% as replacement to bitumen.

  2. Analysis of Instrumentation Selection and Placement to Monitor the Hydrologic Performance of Permeable Pavement Systems and Bioinfiltration Areas at the Edison Environmental Center in New Jersey

    Science.gov (United States)

    In 2009, the U.S. Environmental Protection Agency constructed a 0.4-ha (1-ac) parking lot surfaced with three different permeable pavement types (interlocking concrete pavers, porous concrete, and porous asphalt) and six bioinfiltration areas with three different drainage area to...

  3. Performance testing of asphalt concrete containing crumb rubber modifier and warm mix additives

    Science.gov (United States)

    Ikpugha, Omo John

    American Association of State Highway and Transportation Official's Mechanistic-Empirical Pavement Design Guide (AASHTO MEPDG) software was used to predict long term low temperature performance of the mixtures in various areas of Ontario. Sasobit, Rediset LQ and Rediset WMX gave good 15 years prediction with stone mastic asphalt mixtures but the performance of dense graded mixtures was less satisfactory.

  4. Investigating the Properties of Asphalt Concrete Containing Glass Fibers and Nanoclay

    Directory of Open Access Journals (Sweden)

    Hasan Taherkhani

    2016-06-01

    Full Text Available The performance of asphaltic pavements during their service life is highly dependent on the mechanical properties of the asphaltic layers. Therefore, in order to extend their service life, scientists and engineers are constantly trying to improve the mechanical properties of the asphaltic mixtures. One common method of improving the performance of asphaltic mixtures is using different types of additives. This research investigated the effects of reinforcement by randomly distributed glass fibers and the simultaneous addition of nanoclayon some engineering properties of asphalt concrete have been investigated. The properties of a typical asphalt concrete reinforced by different percentages of glass fibers were compared with those containing both the fibers and nanoclay. Engineering properties, including Marshall stability, flow, Marshall quotient, volumetric properties and indirect tensile strength were studied. Glass fibers were used in different percentages of 0.2, 0.4 and 0.6% (by weight of total mixture, and nanoclay was used in 2, 4 and 6% (by the weight of bitumen. It was found that the addition of fibers proved to be more effective than the nanoclay in increasing the indirect tensile strength. However, nanoclay improved the resistance of the mixture against permanent deformation better than the glass fibers. The results also showed that the mixture reinforced by 0.2% of glass fiber and containing 6% nanoclay possessed the highest Marshall quotient, and the mixture containing 0.6% glass fibers and 2% nanoclay possessedthe highest indirect tensile strength.

  5. Normalization method for asphalt mixture fatigue equation under different loading frequencies

    Institute of Scientific and Technical Information of China (English)

    吕松涛; 郑健龙

    2015-01-01

    In order to analyze the effect of different loading frequencies on the fatigue performance for asphalt mixture, the changing law of asphalt mixture strengths with loading speed was revealed by strength tests under different loading speeds. Fatigue equations of asphalt mixtures based on the nominal stress ratio and real stress ratio were established using fatigue tests under different loading frequencies. It was revealed that the strength of the asphalt mixture is affected by the loading speed greatly. It was also discovered that the fatigue equation based on the nominal stress ratio will change with the change of the fatigue loading speed. There is no uniqueness. But the fatigue equation based on the real stress ratio doesn’t change with the loading frequency. It has the uniqueness. The results indicate the fatigue equation based on the real stress ratio can realize the normalization of the asphalt mixture fatigue equation under different loading frequencies. It can greatly benefit the analysis of the fatigue characteristics under different vehicle speeds for asphalt pavement.

  6. The use of reflective and permeable pavements as a potential practice for heat island mitigation and stormwater management

    Science.gov (United States)

    Li, H.; Harvey, J. T.; Holland, T. J.; Kayhanian, M.

    2013-03-01

    To help address the built environmental issues of both heat island and stormwater runoff, strategies that make pavements cooler and permeable have been investigated through measurements and modeling of a set of pavement test sections. The investigation included the hydraulic and thermal performance of the pavements. The permeability results showed that permeable interlocking concrete pavers have the highest permeability (or infiltration rate, ˜0.5 cm s-1). The two permeable asphalt pavements showed the lowest permeability, but still had an infiltration rate of ˜0.1 cm s-1, which is adequate to drain rainwater without generating surface runoff during most typical rain events in central California. An increase in albedo can significantly reduce the daytime high surface temperature in summer. Permeable pavements under wet conditions could give lower surface temperatures than impermeable pavements. The cooling effect highly depends on the availability of moisture near the surface layer and the evaporation rate. The peak cooling effect of watering for the test sections was approximately 15-35 °C on the pavement surface temperature in the early afternoon during summer in central California. The evaporative cooling effect on the pavement surface temperature at 4:00 pm on the third day (25 h after watering) was still 2-7 °C lower compared to that on the second day, without considering the higher air temperature on the third day. A separate and related simulation study performed by UCPRC showed that full depth permeable pavements, if designed properly, can carry both light-duty traffic and certain heavy-duty vehicles while retaining the runoff volume captured from an average California storm event. These preliminarily results indicated the technical feasibility of combined reflective and permeable pavements for addressing the built environment issues related to both heat island mitigation and stormwater runoff management.

  7. EVALUATION OF TIRE RUBBER DISPOSAL IN CONCRETE FOR PAVEMENTS

    Directory of Open Access Journals (Sweden)

    Rosa Cristina Cecche Lintz

    2009-12-01

    Full Text Available The production of waste by the tire industry has been a growing problem, indicating the need for its reuse. More than thirty million tires are discharged per year in Brazil, where regulation for the environment states that for each four new tires, five unusable ones must be adequately disposed by manufacturers and importers. Paving consumes an extremely large quantity of materials, which can be the source of rational application of waste and rejected materials. Research shows that tire rubber can be added to asphalt, which increases its durability and improves pavement quality and safety conditions by absorbing the rubber elastic properties, and also be used for architectural applications, among others. This study deals with the addition of rubber fibers from tire crushing in concrete for roadway pavements in order to provide proper indication about the alternative material disposal through an evaluation of the mechanical behavior of the modified concrete. Different concrete mixes were produced, within which, part of fine aggregates were substituted by tire rubber and mechanical experiment tests were performed, which show that, due to great resistance losses, the disposal of this alternative material in concrete should be considered for light traffic pavements, with the addition of rubber ranging up to 10% in mass.

  8. EVALUATION OF TIRE RUBBER DISPOSAL IN CONCRETE FOR PAVEMENTS

    Directory of Open Access Journals (Sweden)

    Rosa Cristina Cecche Lintz

    2009-01-01

    Full Text Available The production of waste by the tire industry has been a growing problem, indicating the need for its reuse. More than thirty million tires are discharged per year in Brazil, where regulation for the environment states that for each four new tires, five unusable ones must be adequately disposed by manufacturers and importers. Paving consumes an extremely large quantity of materials, which can be the source of rational application of waste and rejected materials. Research shows that tire rubber can be added to asphalt, which increases its durability and improves pavement quality and safety conditions by absorbing the rubber elastic properties, and also be used for architectural applications, among others. This study deals with the addition of rubber fibers from tire crushing in concrete for roadway pavements in order to provide proper indication about the alternative material disposal through an evaluation of the mechanical behavior of the modified concrete. Different concrete mixes were produced, within which, part of fine aggregates were substituted by tire rubber and mechanical experiment tests were performed, which show that, due to great resistance losses, the disposal of this alternative material in concrete should be considered for light traffic pavements, with the addition of rubber ranging up to 10% in mass.

  9. Effects of Crumb Rubber Size and Concentration on Performance of Porous Asphalt Mixtures

    Directory of Open Access Journals (Sweden)

    Altan Cetin

    2013-01-01

    Full Text Available The purpose of this study is to investigate the effect of size distribution and concentration of crumb rubber on the performance characteristics of porous asphalt mixture. The recycling of scrap tires in asphalt pavements appears as an important alternative providing a large-scale market. The characteristics of bitumen are very important with regard to service life of porous asphalt pavement. The experimental study consists of two main steps. Firstly, the mixture design was performed to determine the optimum bitumen content. In the latter step, the mixtures were modified by dry process using crumb rubber in three different grain size distributions of #4~#20, #20~#200, and #4~#200 and rubber content of 10%, 15%, and 20% as weight of optimum bitumen. The permeability, Cantabro abrasion loss, indirect tensile strength, moisture susceptibility, and resilient modulus tests were carried out on the specimens. Test results show that #20~#200 sized rubber particles reduced air voids and coefficient of permeability, while they increased the Cantabro abrasion loss. In general, increasing the crumb rubber size and content decreased the performance characteristics of the porous asphalt mixtures.

  10. A Comparative Study on Properties of Malaysian Porous Asphalt Mixes with Different Bitumen Contents

    Directory of Open Access Journals (Sweden)

    Mohamad Yusri Aman

    2015-04-01

    Full Text Available Inadequate bitumen content in porous pavement construction may result in incomplete coating of aggregates which a thin bitumen film can oxidize rapidly resulting in premature failure of the pavement. This and presents the effects of porous asphalt prepared with 4.0% and up to 6.0% binder content with 0.5% increments binder. Bitumen penetration grade 60/70 and crushed granite were used in preparing the porous asphalt specimen. The porous asphalt mixes were compacted by applying 50 blows on each face using a Marshall Impact compactor. The specimens were tested for air voids, indirect tensile strength and water permeability and abrasion loss. The moisture sensitivity was assessed according to the AASHTO T283 procedures. The result shows that the increasing of bitumen content has decreased the, bulk density air voids, coefficient of permeability and abrasion loss values However, the Indirect Tensile Strength (ITS has significantly increased and this is a good indication to resistance against moisture sensitivity. It can be concluded that the increasing of bitumen content in porous asphalt has increased the thickness of binder coating around the aggregates. This results reduction in air voids and water permeability, on the other hands it increases resistance to disintegration and ITS value which give better resistance to moisture sensitivity of porous specimens.

  11. Potential contributions of asphalt and coal tar to black carbon quantification in urban dust, soils, and sediments

    Energy Technology Data Exchange (ETDEWEB)

    Yang, Y.; Mahler, B.J.; Van Metre, P.C.; Ligouis, B.; Werth, C.J. [University of Illinois Urbana Champaign, Urbana, IL (USA). Dept. of Civil & Environmental Engineering

    2010-12-01

    Measurements of black carbon (BC) using either chemical or thermal oxidation methods are generally thought to indicate the amount of char and/or soot present in a sample. In urban environments, however, asphalt and coal-tar particles worn from pavement are ubiquitous and, because of their pyrogenic origin, could contribute to measurements of BC. Here we explored the effect of the presence of asphalt and coal-tar particles on the quantification of BC in a range of urban environmental sample types, and evaluated biases in the different methods used for quantifying BC. Samples evaluated were pavement dust, residential and commercial area soils, lake sediments from a small urban watershed, and reference materials of asphalt and coal tar. Total BC was quantified using chemical treatment through acid dichromate (Cr{sub 2}O{sub 7}) oxidation and chemo-thermal oxidation at 375{sup o}C (CTO-375). BC species, including soot and char/charcoal, asphalt, and coal tar, were quantified with organic petrographic analysis. Comparison of results by the two oxidation methods and organic petrography indicates that both coal tar and asphalt contribute to BC quantified by Cr{sub 2}O{sub 7} oxidation, and that coal tar contributes to BC quantified by CTO-375. These results are supported by treatment of asphalt and coal-tar reference samples with Cr2O7 oxidation and CTO-375. The reference asphalt is resistant to Cr{sub 2}O{sub 7} oxidation but not to CTO-375, and the reference coal tar is resistant to both Cr2O7 oxidation and CTO-375. These results indicate that coal tar and/or asphalt can contribute to BC measurements in samples from urban areas using Cr{sub 2}O{sub 7} oxidation or CTO-375, and caution is advised when interpreting BC measurements made with these methods.

  12. Potential contributions of asphalt and coal tar to black carbon quantification in urban dust, soils, and sediments

    Science.gov (United States)

    Yang, Y.; Mahler, B.J.; Van Metre, P.C.; Ligouis, B.; Werth, C.J.

    2010-01-01

    Measurements of black carbon (BC) using either chemical or thermal oxidation methods are generally thought to indicate the amount of char and/or soot present in a sample. In urban environments, however, asphalt and coal-tar particles worn from pavement are ubiquitous and, because of their pyrogenic origin, could contribute to measurements of BC. Here we explored the effect of the presence of asphalt and coal-tar particles on the quantification of BC in a range of urban environmental sample types, and evaluated biases in the different methods used for quantifying BC. Samples evaluated were pavement dust, residential and commercial area soils, lake sediments from a small urban watershed, and reference materials of asphalt and coal tar. Total BC was quantified using chemical treatment through acid dichromate (Cr2O7) oxidation and chemo-thermal oxidation at 375??C (CTO-375). BC species, including soot and char/charcoal, asphalt, and coal tar, were quantified with organic petrographic analysis. Comparison of results by the two oxidation methods and organic petrography indicates that both coal tar and asphalt contribute to BC quantified by Cr2O7 oxidation, and that coal tar contributes to BC quantified by CTO-375. These results are supported by treatment of asphalt and coal-tar reference samples with Cr2O7 oxidation and CTO-375. The reference asphalt is resistant to Cr2O7 oxidation but not to CTO-375, and the reference coal tar is resistant to both Cr2O7 oxidation and CTO-375. These results indicate that coal tar and/or asphalt can contribute to BC measurements in samples from urban areas using Cr2O7 oxidation or CTO-375, and caution is advised when interpreting BC measurements made with these methods. ?? 2010 Elsevier Ltd.

  13. Potential contributions of asphalt and coal tar to black carbon quantification in urban dust, soils, and sediments

    Science.gov (United States)

    Yang, Yaning; Mahler, Barbara J.; Van Metre, Peter C.; Ligouis, Bertrand; Werth, Charles J.

    2010-12-01

    Measurements of black carbon (BC) using either chemical or thermal oxidation methods are generally thought to indicate the amount of char and/or soot present in a sample. In urban environments, however, asphalt and coal-tar particles worn from pavement are ubiquitous and, because of their pyrogenic origin, could contribute to measurements of BC. Here we explored the effect of the presence of asphalt and coal-tar particles on the quantification of BC in a range of urban environmental sample types, and evaluated biases in the different methods used for quantifying BC. Samples evaluated were pavement dust, residential and commercial area soils, lake sediments from a small urban watershed, and reference materials of asphalt and coal tar. Total BC was quantified using chemical treatment through acid dichromate (Cr 2O 7) oxidation and chemo-thermal oxidation at 375 °C (CTO-375). BC species, including soot and char/charcoal, asphalt, and coal tar, were quantified with organic petrographic analysis. Comparison of results by the two oxidation methods and organic petrography indicates that both coal tar and asphalt contribute to BC quantified by Cr 2O 7 oxidation, and that coal tar contributes to BC quantified by CTO-375. These results are supported by treatment of asphalt and coal-tar reference samples with Cr 2O 7 oxidation and CTO-375. The reference asphalt is resistant to Cr 2O 7 oxidation but not to CTO-375, and the reference coal tar is resistant to both Cr 2O 7 oxidation and CTO-375. These results indicate that coal tar and/or asphalt can contribute to BC measurements in samples from urban areas using Cr 2O 7 oxidation or CTO-375, and caution is advised when interpreting BC measurements made with these methods.

  14. Effect of Zn/Al Layered Double Hydroxide Containing 2-Hydroxy-4-n-octoxy-benzophenone on UV Aging Resistance of Asphalt

    Directory of Open Access Journals (Sweden)

    Chao Peng

    2015-01-01

    Full Text Available UV radiation is a main factor to reduce the service life of asphalt pavement due to the UV aging of asphalt binder. To obtain enhanced UV aging resistance, an organic UV absorber called 2-hydroxy-4-n-octoxy-benzophenone (HNOB had been intercalated into an inorganic UV absorber called Zn/Al layered double hydroxide (LDH to play a combined anti-UV role in asphalt binder. Fourier transform infrared spectroscopy revealed that HNOB anions have been intercalated into the interlayer galleries of Zn/Al-LDH containing HNOB anions (Zn/Al-HNOB−-LDH. X-ray diffraction results of Zn/Al-LDH containing CO32− anions (Zn/Al-CO32--LDH and Zn/Al-CO32--LDH/styrene-butadiene-styrene (SBS modified asphalt disclosed that asphalt molecules entered into LDH interlayer galleries to form an expanded phase structure. UV-Vis absorbance patterns showed that Zn/Al-HNOB−-LDH has a better capacity of blocking UV light due to the synergetic effect of HNOB and Zn/Al-LDH. The chemical fractions analysis, conventional physical tests, and rheological tests of SBS modified asphalt, Zn/Al-CO32--LDH/SBS modified asphalt, and Zn/Al-HNOB−-LDH/SBS modified asphalt before and after UV aging testified that Zn/Al-HNOB−-LDH can improve the UV aging resistance of SBS modified asphalt more significantly.

  15. Comparison and Evaluation Research on High Viscosity Asphalt Types of Drainage Asphalt Mixture%排水沥青混合料高粘沥青类型的对比和评价研究

    Institute of Scientific and Technical Information of China (English)

    丁志勇

    2016-01-01

    Viscous asphalt is the core of the drainage asphalt mixture material.In this research,the high viscosity asphalt was produced using star-shaped and linear SBS respectively,on this basis,the pavement performance of OGFC-1 3 drainage asphalt mixture was tested in the laboratory.It was found that the pavement performance of asphalt mixture made by the star-shaped SBS was better than that made by the linear SBS through the wheel rutting test,beam bending test,freeze-thaw splitting test and water dispersion test.%高粘沥青是排水沥青混合料的核心材料。文中采用星型和线型 SBS改性沥青制备高粘沥青,在此基础上,室内成型 OGFC-13排水沥青混合料,并对沥青混合料的路用性能进行研究。通过往复车辙轮碾压试验、低温弯曲梁试验、冻融劈裂试验和浸水飞散试验进行对比。结果表明,采用星型 SBS制备的排水沥青混合料各项路用性能均优于线型 SBS排水沥青混合料。

  16. 沥青混凝土面层碎石集料的质量控制%Quality control of gravel aggregate of asphalt concrete surface layer

    Institute of Scientific and Technical Information of China (English)

    高明成

    2011-01-01

    From the gravel aggregate production and processing,transportation,storage and other aspects,this paper provided points of requirements of asphalt,the upper layer of gravel aggregate quality control,maximum reduced the influence of raw material to the construction quality and durability of asphalt concrete pavement,and improved the service performance of asphalt pavement.%从碎石集料生产加工、运输、存放等方面,提出沥青中、上面层碎石集料质量控制的几点要求,最大限度的减小原材料对沥青混凝土面层施工质量及耐久性的影响,进而提高沥青路面使用性能。

  17. Characteristics and applications of high-performance fiber reinforced asphalt concrete

    Science.gov (United States)

    Park, Philip

    Steel fiber reinforced asphalt concrete (SFRAC) is suggested in this research as a multifunctional high performance material that can potentially lead to a breakthrough in developing a sustainable transportation system. The innovative use of steel fibers in asphalt concrete is expected to improve mechanical performance and electrical conductivity of asphalt concrete that is used for paving 94% of U. S. roadways. In an effort to understand the fiber reinforcing mechanisms in SFRAC, the interaction between a single straight steel fiber and the surrounding asphalt matrix is investigated through single fiber pull-out tests and detailed numerical simulations. It is shown that pull-out failure modes can be classified into three types: matrix, interface, and mixed failure modes and that there is a critical shear stress, independent of temperature and loading rate, beyond which interfacial debonding will occur. The reinforcing effects of SFRAC with various fiber sizes and shapes are investigated through indirect tension tests at low temperature. Compared to unreinforced specimens, fiber reinforced specimens exhibit up to 62.5% increase in indirect tensile strength and 895% improvements in toughness. The documented improvements are the highest attributed to fiber reinforcement in asphalt concrete to date. The use of steel fibers and other conductive additives provides an opportunity to make asphalt pavement electrically conductive, which opens up the possibility for multifunctional applications. Various asphalt mixtures and mastics are tested and the results indicate that the electrical resistivity of asphaltic materials can be manipulated over a wide range by replacing a part of traditional fillers with a specific type of graphite powder. Another important achievement of this study is development and validation of a three dimensional nonlinear viscoelastic constitutive model that is capable of simulating both linear and nonlinear viscoelasticity of asphaltic materials. The

  18. Effect of Carbon Nanofiber on Mechanical Behavior of Asphalt Concrete

    Directory of Open Access Journals (Sweden)

    Saeed Ghaffarpour Jahromi

    2015-09-01

    Full Text Available Uses of fibers to improve material properties have a scientific background in recent years in civil engineering. Use of Nanofiber reinforcement of materials refers to incorporating materials with desired properties within some other materials lacking those properties. Use of fibers for improvement is not a new phenomenon as the technique of fiber-reinforced bitumen began as early as 1950, but using nanofiber is a new idea. In this research the mechanical properties of asphalt mixture that have been modified with carbon nanofiber were investigated using mechanical tests, which can improve the performance of flexible pavements. To evaluate the effect of nanofiber contents on bituminous mixtures, laboratory investigations were carried out on the samples with and without nanofibers. During the course of this study, various tests were undertaken applying the Marshall test, indirect tensile test, resistance to fatigue cracking by using repeated load indirect tensile test and creep test. Carbon nanofiber exhibited consistency in results and it was observed that the addition of nanofiber can change the properties of bituminous mixtures, increase its stability and decrease the flow value. Results indicate that nanofiber have the potential to resist structural distress in the pavement and thus improve fatigue by increasing resistance to cracks or permanent deformation, when growing traffic loads. On the whole, the results show that the addition of carbon nanofiber will improve some of the mechanical properties such as fatigue and deformation in the flexible pavement.

  19. Impact of Vehicle Class and Tire Pressure on Pavement Performance in MEPDG

    Directory of Open Access Journals (Sweden)

    Mohamed I. E. Attia

    2014-10-01

    Full Text Available The new Mechanistic-Empirical Pavement Design Guide (MEPDG design and analysis procedures defines the exact traffic loading by defining the specific number of each vehicle class and the use of axle load distribution factors instead of the equivalent single axle load (ESAL. The number of traffic inputs (parameters in MEPDG was found to be 17024. This research aimed to evaluate the sensitivity of the predicted flexible pavement distress to vehicle class and tire pressure in MEPDG. To evaluate the impact of vehicle (truck class on pavement sections, different cases of loading were analyzed. For each case, the MEPDG Ver. 1.1 was used to evaluate the effect of tire pressure by solving each case for a tire pressure of 120 and 140 psi. The effect of the traffic parameters on asphalt pavement (AC rutting, base rutting, subgrade rutting, international roughness index (IRI, longitudinal cracking and fatigue (alligator cracking were investigated. It was found that vehicle class distribution (VCD would cause clear impact (comparable to the effect of AADTT level only if the major traffic is of specific class (very light or very heavy. If this is not the case, the vehicle class distribution will not be a significant factor that affects the final design because most of the trucks had similar impact on flexible pavement distresses. The impact of tire pressure is clear on longitudinal cracking, fatigue cracking and AC rutting, and have no significant impact on both base and subgrade rutting.

  20. State-of-the-art review of the applications of nanotechnology in pavement materials

    Science.gov (United States)

    Castillo, Luis, Jr.

    The use of nanotechnology in pavement materials is one main area that shows great promise and has the potential to change commonly used materials. This will develop more effective solutions to achieve the desired performance. The overall objective of this work is to present a state-of-the-art literature review of nano-science-based principles to improve the performance and, ultimately, the life cycle of transportation construction materials. This work will be organized into two different parts. The first part will consist of six sections: applications of nanotechnology in concrete pavements, applications of nanotechnology in asphalt pavement, application of nanotechnology in general soils, cost-benefit analysis, challenges, and trends to the future. In addition, a current practice review was performed from a literature review that included a questionnaire of the knowledge and opinion about nanotechnology, which included students, general contractors, teachers, engineers, and architects. The second part will deal with the advancement of the application of nanotechnology in pavement materials for different developed countries. Because nanotechnology is relatively a young field in pavement materials, limited research has been conducted in North America, Europe, and Asia. A comparison of the advancement of nano-science-based principles, as applied to the performance and life cycle of transportation materials, for the three continents will be carried out in a summarized manner.