WorldWideScience

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. Reducing Your Cost for Asphalt Pavements

    OpenAIRE

    Evans, Alvin

    2012-01-01

    This session will discuss of how local government decision-makers can achieve greater value without sacrificing quality or service life. The session will touch upon use of Higher Recycled Asphalt Pavement (RAP), Recycled Asphalt Shingles (RAS), Asphalt Mix Design for Heavy Traffic vs. Light Traffic, Speed of Construction, Perpetual Pavement and Pavement Rehabilitation Strategies.

  3. 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 ...

  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. Asphalt pavement temperature prediction

    OpenAIRE

    Minhoto, Manuel; Pais, Jorge; Pereira, Paulo

    2006-01-01

    A 3-D finite element model (FEM) was developed to calculate the lemperature of an asphtalt rubber pavement localed in the Northeast of Portugal. The goal of the case study presented in this paper is to show the good accuracy temperature prediction tha can be obtained with this model when compared with the field pavement thermal condition obtained during a year. lnput data to the model are the hourly values for solar radiation and temperature and the mean daily value of wind speed obtained fr...

  6. Mechanical Response Analysis of Asphalt Pavement Structure

    Directory of Open Access Journals (Sweden)

    Yu Zhenqing

    2015-11-01

    Full Text Available Generally, the Chinese designed life of the high- grade asphalt concrete pavement is required 15 years, however, the designed life of the road in surface is often lower than the designed life, and even premature failure. Especially in heavy traffic conditions, the early damage of some high grade-asphalt pavement in China is serious. According to some investigations, we founded the main reason of the long-life asphalt pavement is to determine the function of each structure layer. According to the stress of pavement structure layer, so as to select the structure layer materials. Based on the viewpoint of mechanics, asphalt pavement damage mode is divided into three categories, such as top-down crack, fatigue cracking and rutting. Therefore, this paper uses ANSYS finite element software as calculation tool, the combination of road vehicle load and the primary influence on asphalt pavement structure mechanics response characteristics were analyzed. In this paper, the method of analysis is control variable: that means under different vehicle axle load, only change surface layer modulus and observe the pavement structure mechanical response trends to compare the effect. By using the same method, the response of the pavement base course parameters to the pavement mechanical structure is analyzed.

  7. 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

  8. Recycling of asphalt pavements with asphalt rubber

    OpenAIRE

    Pais, Jorge; Pereira, Paulo; Minhoto, Manuel; Baptista, António

    2008-01-01

    Pavement recycling has been an important rehabilitation technique to deal with reclaimed materials from old pavements which are usually sent to landfills. The application of this technique contributes to: i) the accomplishment of the requirements defined by the European legislation for the amount of material sent to landfills; ii) the reduction in the use of new raw materials used to produce pavement layers. The reduction of materials to be used in pavement rehabilitation has also been possib...

  9. 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.

  10. 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...

  11. 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,…

  12. Comparative Study of French and Chinese Asphalt Pavement Design Methods

    OpenAIRE

    Pierre Guy Atangana Njock; Li Yueguang

    2015-01-01

    This study deals with the comparison of French and Chinese approaches for the design of flexible pavement. The Finite Element Analysis (FEA using ANSYS) was used to compute and compare the mechanical responses in four typical pavement structures used in France and China, for respective axle type and loads. The study concluded that the maximum deflection in typical structure of stabilized asphalt pavement in China is greater than that obtained in the typical treated bases asphalt pavement in F...

  13. 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.

  14. Monitoring asphalt pavement damages using remote sensing techniques

    Science.gov (United States)

    Mettas, Christodoulos; Themistocleous, Kyriacos; Neocleous, Kyriacos; Christofe, Andreas; Pilakoutas, Kypros; Hadjimitsis, Diofantos

    2015-06-01

    One of the main issues in the maintenance plans of road agencies or governmental organizations is the early detection of damaged asphalt pavements. The development of a smart and non-destructive systematic technique for monitoring damaged asphalt pavements is considered a main priority to fill this gap. During the 1970's, remote sensing was used to map road surface distress, while during the last decade, remote sensing became more advanced, thereby assisting in the evolution of the identification and mapping of roads. Various techniques were used in order to explore condition, age, weaknesses and imperfections of asphalted pavements. These methods were fairly successful in the classification of asphalted surfaces and in the detection of some of their characteristics. This paper explores the state of the art of using remote sensing techniques for monitoring damaged pavements and some typical spectral profiles of various asphalt pavements in Cyprus area acquired using the SVC1024 field spectroradiometer.

  15. Full-Depth Pavement Reclamation with Foamed Asphalt: Final Report

    OpenAIRE

    Jones, David; P. Fu; Harvey, John T; Halles, F.

    2008-01-01

    A comprehensive study on full-depth reclamation (FDR) of pavements with foamed asphalt has been completed for the California Department of Transportation by the University of California Pavement Research Center. A literature review revealed that very little research had been carried out on the reclamation of thick asphalt pavements (multiple overlays over a relatively weak base or subgrade). A mechanistic sensitivity analysis was carried out to identify key variables in the design of recycled...

  16. Reinforcing Effects of Carbon Black on Asphalt Binder for Pavement

    OpenAIRE

    Yamaguchi, Katsuyuki; Sasaki, Iwao; Nishizaki, Itaru; Meiarashi, Seishi; Moriyoshi, Akihiro

    2005-01-01

    Carbon black, used as a reinforcing filler for rubber materials, was evaluated for asphalt binders in pavements. Carbon black added to straight asphalt within 20 wt% caused an increase in the elastic modulus and a decrease in the viscosity of the asphalt, especially at temperatures higher than room temperature. Addition of carbon black raised the maximum service temperature of asphalt in the category of the binder performance grade according to the SHRP (Strategic Highway Research Program) sp...

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

    International Nuclear Information System (INIS)

    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.

  18. 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.

  19. Investigating In Situ Properties of Recycled Asphalt Pavement with Foamed Asphalt as Base Stabilizer

    OpenAIRE

    Antonis Kaltsounis; Vasilis Papavasiliou; Andreas Loizos; Christina Plati

    2010-01-01

    The objective of the present study was to conduct a comprehensive field experiment for the in situ assessment of in-depth recycled asphalt pavement using foamed asphalt as a stabilization treatment for base works. For this purpose Nondestructive Testing (NDT) data collected using the Falling Weight Deflectometer (FWD) and Ground Penetrating Radar (GPR) along a foamed asphalt recycled pavement section was thoroughly analysed. Critical issues including the stabilized material curing and the con...

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

    OpenAIRE

    Yingwei Ren; Jingsong Shan

    2014-01-01

    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 thickn...

  1. Road Performance of Fiber Reinforced Asphalt Concrete Bridge Deck Pavement

    OpenAIRE

    Xiu Liu; Zhaojie Sun; Decheng Feng; Yixiang Cao

    2013-01-01

    As the problem of asphalt concrete bridge deck pavement is becoming more and more serious, how to improve its road performance has become the focus of the study. Considering fiber is widely used in road engineering, wheel tracking test, flexural test, immersion marshall test and freeze-thaw splitting test were carried out to study road performance of asphalt mixture with different fiber contents, analyzing the function mechanism of fiber reinforced asphalt ...

  2. Use of scrap rubber in asphalt pavement surfaces

    Science.gov (United States)

    Eaton, Robert A.; Roberts, Richard J.; Blackburn, Robert R.

    1991-12-01

    Scrap tire rubber was mixed into an asphalt concrete wearing course to study the effect of ice disbonding from the pavement surface under traffic. Rubber contents of 0, 3, 6, and 12 percent by weight were studied. Initial laboratory ice disbonding test results led to the development of a new paving material, Chunk Rubber Asphalt Concrete (CRAC), that uses larger pieces of rubber in a much denser asphalt concrete mix. Strength values doubled and ice disbonding performance was enhanced.

  3. 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.

  4. Improvement of the functional pavement quality with asphalt rubber mixtures

    OpenAIRE

    Fontes, Liseane P. T. L.; Pereira, Paulo A. A.; Pais, Jorge C.; Trichês, Glicério

    2006-01-01

    Skid resistance and texture are important safety characteristics which need to be considered in flexible pavement design, maintenance and rehabilitation. The main objective of this paper is to optimize surface texture characteristics in asphalt rubber pavements, mainly macrotexture to reduce splash, spray and hydroplaning and microtexture to increase friction at low and high speeds. The objective was accomplished by measuring the friction surface with two different tests: (i) B...

  5. 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. PMID:24027444

  6. New approach for calculating permanent deformation in asphalt pavement

    Institute of Scientific and Technical Information of China (English)

    TAN Yi-qiu; CHEN Feng-chen; LIU Hao; SU Xin; DONG Ze-jiao; DONG Yu-ming

    2010-01-01

    A new approach using the Fiber Bragg Grating(FBG)sensor and viscoelastic model to monitor and analyze the internal strain and temperature of asphalt pavement is proposed.Some parameters including peak strain,temperature and loading time were calculated with the application of multi-dimensional sensors group.These parameters were incorporated with viscoelastic model of five units to evaluate the permanent deformation of pavement.An application example was conducted,and the results show that it is feasible to analyze and calculate the permanent deformation of pavement structures with FBG sensors.

  7. 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.

  8. 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.

  9. 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.

  10. Effects of conductive fillers on temperature distribution of asphalt pavements

    International Nuclear Information System (INIS)

    The sun provides a cheap and abundant source of clean and renewable energy. Solar cells have been used to capture this energy and generate electricity. A more useful form of the solar cell would be asphalt pavements, which get heated up by solar radiation. Graphite powders are utilized as thermal conductive fillers to make an asphalt collector conductive so as to improve the efficiency of the asphalt collector. Accounting for the important application conditions and evaluating the effects of the heat conductive materials and the solar energy absorbability of the conductive asphalt collector, a finite element model has been developed to predict temperature distributions in the conductive asphalt solar collector. In this study, an experimental validation exercise was conducted using the measured data taken from full-depth asphalt slabs. Validation results showed that the model can satisfactorily predict the temperature distributions in asphalt concrete slabs. The optimal depth is 25-50 mm for placing pipes that serve as the heat exchanger. Meanwhile, the effect of the surroundings on the solar energy potential of the asphalt collector was noticeable.

  11. 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.

  12. Advanced methodology for optimization of mixture design of asphalt concrete containing reclaimed asphalt pavement material

    OpenAIRE

    Bressi, Sara

    2016-01-01

    Despite the massive use of Reclaimed Asphalt Pavement (RAP) in Hot Mix Asphalt (HMA) production, the chemo-physical phenomena that characterise the fabrication of these mixtures have not yet been completely explored. The detection and understanding of these mechanisms as well as the study of the heterogeneity that characterizes high RAP mix production are fundamental to improving the approach to recycling, because they represent the source of the mixture characteristics and performance. This...

  13. 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.

  14. 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.

  15. Numerical simulation on the thermal response of heat-conducting asphalt pavements

    International Nuclear Information System (INIS)

    Using asphalt pavements as a solar collector is a subject of current interest all over the world because the sun provides a cheap and abundant source of clean and renewable energy, which can be captured by black asphalt pavements. A heat-conducting device is designed to absorb energy from the sun. In order to validate what parameters are critical in the asphalt collector, a finite element model is developed to predict the thermal response of the heat-conducting device compared to the conventional asphalt mixture. Some factors that may affect the asphalt pavement collector are considered, including the coefficient of heat conductivity of the asphalt pavement, the distance between pipes with the medium, water, and the pipe's diameter. Ultimately, the finite element model can provide pavement engineers with an efficient computational tool that can be a guide to the conductive asphalt solar collector's experiment in the laboratory.

  16. Genetic Optimization Method of Asphalt Pavement Based on Rutting and Cracking Control

    Institute of Scientific and Technical Information of China (English)

    2003-01-01

    Nowadays asphalt pavement structure bearing is not the main subject for pursuers to study.Comparatively,the pavement performance is more important and emphasized.Based on this,rutting and cracking analysis is introduced into pavement optimization.A optimization model based on these two considerations is also established.The genetic algorithms (GAs) is adopted to solve the model.It is an intellective method.This research provides a new idea and technique for asphalt pavement structure optimization.

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

    International Nuclear Information System (INIS)

    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.

  18. 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.

  19. 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.

  20. The Research on the Cracks of the Asphalt Pavement

    OpenAIRE

    OuYangZiqiang; Li Chunge

    2015-01-01

    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

  1. The Research on the Cracks of the Asphalt Pavement

    Directory of Open Access Journals (Sweden)

    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

  2. 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.

  3. INVESTIGATION OF ASPHALT PAVEMENT WITH ADDED CRUMB RUBBER

    OpenAIRE

    Mandula, Jan; Olexa, Tomaš; Holubka, Mariya; Salaiova, Brigita

    2014-01-01

    Waste tires must be recycled in environmentally safe ways that meet civil engineering concerns while fulfilling standards for construction materials. Used tires can be processed into rubber powders with particle sizes of 0–2 mm, a suitable fine aggregate for mixing into road pavements. We tested asphalt mixtures with rubber added using the dry method, comparing their properties with a traditional mixture. We tested asphalt–rubber mixtures with rubber incorporated at either ambient temperature...

  4. 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.

  5. Design of a sensor for asphalt pavement pressure field measurements

    Science.gov (United States)

    Liu, Hongyue; Liang, Dakai; Han, Xiaolin; Wang, Xiaogang

    2013-06-01

    From the sensitivity of the FBG center wavelength changing with strain changes on the surface, the design of a FBG strain-based asphalt pavement pressure sensor is described by designing a special FBG asphalt box-film packaging structure. The compactness and simplicity of the device are achieved by using the corresponding package obtained from common available asphalt. Numerical analysis and experimental results show that the response of the sensor has good regularity for a wide range of travel (0MPa to 5.3312MPa). In the load range, the FBG center wavelength increases from 1548.264nm to 1548.346nm which shows a good correspondence with loads. Linearity, travel and sensitivity are experimentally determined by different packaging parameters. A design chart that includes the travel (0MPa to 5.3312MPa) and the sensitivity (15.3812pm/MPa) is finally proposed.

  6. Analysis of Load Stress for Asphalt Pavement of Lean Concrete Base

    Science.gov (United States)

    Lijun, Suo; Xinwu, Wang

    The study revealed that whether it is early distresses in asphalt pavement or not depends largely on working performance of base. In the field of asphalt pavement, it is widely accepted that lean concrete base, compared with the general semi-rigid base, has better working performance, such as high strength and good eroding resistance. Problem of early distresses in asphalt pavement, which caused by more traffic loadings, can be settled effectively when lean concrete is used in asphalt pavement. Traffic loading is important parameter used in the analysis of the new pavement design. However, few studies have done extensive and intensive research on the load stress for asphalt pavement of lean concrete base. Because of that, it is necessary to study the load stress for the asphalt pavement. In the paper, first of all, three-dimension finite element model of the asphalt pavement is created for the aim of doing mechanical analysis for the asphalt pavement. And then, the two main objectives of this study are investigated. One is analysis for load stress of lean concrete base, and the other is analysis for load stress of asphalt surface. The results show that load stress of lean concrete base decreases, decrease and increase with increase of base's thickness, surface's thickness and ratio of base's modulus to foundation's modulus respectively. So far as the asphalt surface is concerned, maximum shearing stress, which is caused by load, is evident in asphalt surface which is located in transverse contraction joint of lean concrete base of asphalt pavement. Maximum shearing stress decrease, decrease, decrease and increase respectively with increase of the surface's modulus, the surface's thickness, base's thickness and ratio of base's modulus to foundation's modulus.

  7. 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

    PMA where it is formulated to melt and blend with asphalt quickly during a batch mixing process. The main objectives of this study are to (1) build asphalt pavement using asphalt mixtures with SBS-based compound added using a “dry” process at the batch plant and (2) evaluate its performance under......-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...

  8. 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…

  9. Design Methodologies of Asphalt Pavement Used in China and Mozambique

    Science.gov (United States)

    Francisco Rufino Diogo, Jose; Shubber, Ammar Abbas Mohammed; Lin, Mu Han

    This study discusses and compares Asphalt Concrete (AC) pavement design methodologies used in China and Mozambique (based on South African Transportation and Communication Commission (SATCC) methodologies). The SATCC design methodologies use California Bearing Ratio (CBR) and catalogues methods. The South African catalogues are basically used for roads with traffic less than 30 million ESAs. The design catalogues method give small thickness than CBR and Chinese methods. The Chinese and the South African design methods give nearly the same thickness; this study concludes that these methods can be used in both countries; China and Mozambique. The results also show that the strong point of Chinese method is verifying the tensile stress and allowable displacement on the pavement calculated from computer program APDS.

  10. Experimental study of recycled asphalt mixtures with high percentages of reclaimed asphalt pavement (RAP)

    OpenAIRE

    Valdés Vidal, Gonzalo A.; Pérez Jiménez, Félix Edmundo; Miró Recasens, José Rodrigo; Martínez Reguero, Adriana Haydée; Botella Nieto, Ramón

    2011-01-01

    This paper presents an experimental study to characterize the mechanical behaviour of bituminous mixtures containing high rates of reclaimed asphalt pavement (RAP). Two semidense mixtures of 12 and 20 mm maximum aggregate size and containing 40 and 60% RAP, respectively (S-12 and S-20, in accordance with Spanish specifications), which were used for rehabilitation of a highway section, were evaluated. First, the effect of RAP variability on the recycled mixtures was analyzed. Their mecha...

  11. 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

    2016-03-01

    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. PMID:27011196

  12. 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.

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

    OpenAIRE

    Ahmed Abdelgalil; Hasanan Nor

    2014-01-01

    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 manuf...

  14. Summary of Construction Activities and Results from Six Initial Accelerated Pavement Tests Conducted on Asphalt Concrete Pavement Section for Modified-Binder Overlay

    OpenAIRE

    Bejarano, Manuel O.; Morton, Bruce S.; Scheffy, Clark

    2005-01-01

    This report summarizes the activities and data collected during the construction of a pavement section used for investigating the performance of asphalt concrete pavements under accelerated pavement testing. This report also presents the preliminary results of six accelerated pavement tests conducted on the test section. The pavement section was constructed in September 2001 at the Pavement Research Center, located at the University of California Richmond Field Station. The construct...

  15. 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.

  16. Contributions of performance-graded asphalt to low temperature cracking resistance of pavements. Final report

    Energy Technology Data Exchange (ETDEWEB)

    Loh, S.W.; Olek, J.

    1999-05-01

    The purpose of this research was to study and evaluate the role that asphalt cracking. As part of the Strategic Highway Research Program (SHRP) new specifications for asphalt binders were developed that are based on the performance of the material. The asphalt binder graded and specified according to these new performance-based specifications is called PG binder. These new specifications are commonly referred to as Superpave (Superior Performing Asphalt Pavement) binder specifications. A section of Interstate 64 in southern Indiana was experiencing severe low temperature cracking before it was reconstructed over the summers of 1995 and 1996. The binder used in the new pavement mixes was PG material. Dynamic Shear Rheometer (DSR) tests, Bending Beam Rheometer (BBR) tests, and viscosity tests were performed on this binder. Comparisons were made between test results obtained from the binders in the old pavement and the new pavement. All tests and comparisons were based on the Superpave binder specifications.

  17. The influence of recycled asphalt pavement on 20mm binder course mix performance

    OpenAIRE

    Tabakovic, Amir; Gibney, Amanda; Gilchrist, M. D.; McNally, Ciaran

    2006-01-01

    This paper presents the results of ongoing research on the mechanical performance of a 20mm binder course asphalt pavement mix incorporating recycled asphalt pavement (RAP). A series of binder course mixes were designed containing varying percentages of RAP. A mix made only from virgin material was selected as the control mix for the investigation. The effect of introducing RAP into the binder course mix was evaluated through a series of laboratory tests including the Marshall Test, Indire...

  18. Solar-reflective coating as a cooling overlay for asphalt pavement

    Science.gov (United States)

    Wang, He; Xu, Geng; Feng, Decheng; Zhong, Jing; Xie, Ning

    2012-04-01

    Rutting is one of the most serious problems on asphalt pavements. Decrease the surface temperature of the asphalt pavement is an effective method to solve the rutting problem on asphalt pavements. In this study, nano sized particles filled polymer composite was developed as an overlay to reflect the solar energy and decrease the surface temperature of asphalt pavements. The overlay was composed of acrylic or epoxy resin filled with nano TiO2 or nano TiNO2. The solar reflection of the nano particle filled polymers was tested and the results showed that solar reflection effectiveness of the epoxy/TiO2 composite reached the highest value. The results of outdoor temperature test indicate that the solar-reflective overlay could decrease the surface temperature of asphalt pavements about 10 °C when the pavement temperature is about 60 °C. Pavement skid resistance was also tested, which expressed by micro/macrotexture depth and the results of which showed that both matrix was qualified after coated with aggregates on the surface.

  19. Characterization and modelling of self healing of bituminous materials towards durable asphalt pavement

    NARCIS (Netherlands)

    Qiu, J.; Van de Ven, M.F.C.; Schlangen, H.E.J.G.; Wu, S.; Molenaar, A.A.A.

    2012-01-01

    The traffic volume and the number of heavy vehicles are growing enormously nowadays. There is a need for designing a durable asphalt pavement with innovative technologies. Pavement structures and materials with self healing and self repairing capability are believed to be very useful in such a syste

  20. 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...

  1. Effects of diurnal temperature dynamics on curing of cold-emulsion reclaimed asphalt pavements

    OpenAIRE

    Kiplagat Chelelgo

    2010-01-01

    Strength development in Cold-Emulsion Reclaimed Asphalt Pavements is gradual and largely dependent on the rate at which curing proceeds. Its early life strength is therefore low and presents a major challenge in material specification for mechanistic pavement design. The solution has been to subject a sample of the mixture to be used in the pavement to accelerated laboratory curing to the attainment of Equilibrium Moisture Content (EMC) condition. Fatigue and Stiffness parameters of the mix a...

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

    OpenAIRE

    Ali Reza Ghanizadeh

    2016-01-01

    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 deve...

  3. Characterization of infiltration capacity of permeable pavements with porous asphalt surface using cantabrian fixed infiltrometer

    OpenAIRE

    Rodríguez Hernández, Jorge; Castro Fresno, Daniel; Fernández Barrera, Andrés Humberto; Vega Zamanillo, Ángel

    2012-01-01

    Porous asphalt is used in Permeable Pavement Systems, but it is sensitive to surface clogging, which leads to a loss in its infiltration capacity. Test methods based on the use of permeable pavement models, which are manufactured in a laboratory and assessed under different clogging conditions, such as slope, rain, and runoff, have been widely applied to the study of permeable pavements with concrete blocks but not to the study of porous bituminous mixtures. The Cantabrian Fixed (CF) Infiltro...

  4. 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.

  5. Calibration on MEPDG Low Temperature Cracking Model and Recommendation on Asphalt Pavement Structures in Seasonal Frozen Region of China

    OpenAIRE

    Hongyan Ma; Dongsheng Wang; Changjun Zhou; Decheng Feng

    2015-01-01

    In order to implement the Mechanistic-Empirical Pavement Design Guide (MEPDG) to design and maintain asphalt pavements in China, it is necessary to calibrate transfer functions of distresses in MEPDG with local conditions, including traffics, environment, and materials as well as measured pavement distresses data in field. Comprehensive single factor sensitivity analyses of factors that influence thermal cracking of asphalt pavements were conducted utilizing the MEPDG low temperature cracking...

  6. How to transform an asphalt concrete pavement into a solar turbine

    International Nuclear Information System (INIS)

    Highlights: • We create a system for harvesting energy from asphalt concrete. • We create an artificial porosity in the asphalt concrete. • We connect a chimney to this porosity. • Differences in temperature produce an air flow. • This air flow serves also for cooling down the pavement. - Abstract: Asphalt concrete can absorb a considerable amount of the incident solar radiation. For this reason asphalt roads could be used as solar collectors. There have been different attempts to achieve this goal. All of them have been done by integrating pipes conducting liquid, through the structure of the asphalt concrete. The problem of this system is that all pipes need to be interconnected: if one is broken, the liquid will come out and damage the asphalt concrete. To overcome these limitations, in this article, an alternative concept is proposed:parallel air conduits, where air can circulate will be integrated in the pavement structure. The idea is to connect these artificial pore volumes in the pavement to an updraft or to a downdraft chimney. Differences of temperature between the pavement and the environment can be used to create an air flow, which would allow wind turbines to produce an amount of energy and that would cool the pavement down in summer or even warm it up in winter. To demonstrate that this is possible, an asphalt concrete prototype has been created and basics calculations on the parameters affecting the system have been done. It has been found that different temperatures, volumes of air inside the asphalt and the difference of temperature between the asphalt concrete and the environment are critical to maximize the air flow through the pavement. Moreover, it has been found that this system can be also used to reduce the heat island effect

  7. Asphalt rubber interlayer benefits on reflective crack retardation of flexible pavement overlays

    OpenAIRE

    Shakir, Shatnawi; Pais, Jorge; Minhoto, Manuel

    2011-01-01

    This paper provides an overview of the asphalt rubber interlayer benefits on reflective crack retardation in flexible pavement preservation and rehabilitation strategies. These interlayers are known in California as asphalt rubber absorbing membrane interlayers (SAMI-R) or as asphalt rubber aggregate membrane interlayers (ARAM-I) chip seals. These interlayers have been used successfully as part of cape seals and as part of an overlay system. The paper focuses on the performance in terms of fi...

  8. Asphalt rubber interlayer benefits in minimizing reflective cracking of overlays over rigid pavements

    OpenAIRE

    Shatnawi, Shakir; Pais, Jorge; Minhoto, Manuel

    2012-01-01

    This paper provides an overview of the asphalt rubber interlayer benefits on reflective crack retardation in overlays over rigid pavements. These interlayers are known in California as asphalt rubber absorbing membrane interlayers (SAMI-R) or as asphalt rubber aggregate membrane interlayers (ARAM-I) chip seals. The paper focuses on the performance in terms of field project reviews, laboratory performance tests and finite element analysis. SAMI-R has been given a reflective cracking equivalent...

  9. New Asphalt Pavement Failure Criterion Based on Unifi ed Strength Theory

    Institute of Scientific and Technical Information of China (English)

    YANG Qun; CHEN Lu; WANG Ping; DAI Jingwang

    2015-01-01

    This study aims to introduce an appropriate analytical method for asphalt pavement based upon unified strength theory (UST). The traditional maximum shear stress strength theory (MSST) cannot describe the marked difference between tension strength and compressive strength or variable intermediate principal stress, which significantly affects the geotechnical materials. Our studies try to find a new asphalt pavement failure criterion that considers the influence of both tension-compression strength ratio and intermediate principal stress of asphalt mixture. In order to select a suitable theory on pavement material, the UST is introduced and compared with the traditional theory. Results show that the tension-compression strength ratio of asphalt mixture, which is used as a material parameter, dramatically affects the stress and stress distribution law in pavement; the pavement stress level increases dramatically after considering the intermediate principal stresses. Therefore, the UST which considers both tension-compression strength ratio and intermediate principal stress is more in line with the material characteristics of asphalt pavement.

  10. 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.

  11. 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.

  12. 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.

  13. 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.

  14. 沥青路面施工技术浅谈%On construction technology of asphalt pavement

    Institute of Scientific and Technical Information of China (English)

    李伟勇

    2009-01-01

    Combined with wide application of asphalt pavement the reasons caused the premature failure of asphalt pavement axe analyzed, at the same time corresponding key points for asphalt pavement construction are presented. Meanwhile, technological research and innovation prospect of asphalt pavement are elaborated, in order to increase construction quality and prolong the service life of asphalt pavement to ensure investment benefits.%结合沥青路面的广泛应用,分析了沥青路面早期损害形成的原因,提出了沥青路面施工要领,阐述了沥青路面的技术研究和创新前景,以提高沥青路面的质量,延长沥青路面的使用周期,从而提高投资效益.

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

    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.

  16. 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.

  17. 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.

  18. Analysis of asphalt pavement structural response from an accelerated loading test

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    This study was to compare theoretical calculation and practical measurement structure response of asphalt pavement. Analysis of the pavement layer moduli was determined from a Back-calculation of Falling Weight Deflectometer (FWD) data and the measured stiffness moduli of asphalt layer cores. The pavement response was calculated using a theoretical model and the measured strain response at the bottom different layers.Layered elastic theory was used to back-calculate the layer moduli and three different theory models were used to forward calculate the strain and deflection. The models were: Layered Elastic Theory (LET), the Method of Equivalent Thicknesses (MET) with linear elastic and the Finite Element Method (FEM) where asphalt layer may be viscoelastic. The results showed that the calculation structure response from FEM was consistent with measured results.

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

    OpenAIRE

    Jorge Rodriguez-Hernandez; Valerio C. Andrés-Valeri; Miguel A. Calzada-Pérez; Ángel Vega-Zamanillo; Daniel Castro-Fresno

    2015-01-01

    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 asph...

  20. 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.

  1. 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.

  2. 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. PMID:24688369

  3. Thermal and Mechanical Properties of Glass Cullet Mixed with Asphalt as Low-Exothermic Pavement Material

    OpenAIRE

    Gotoh, Keinosuke; Yamanaka, Minoru; Saruwatari, Motoki; Mochishita, Teruo

    2001-01-01

    The asphalt pavement contributes to the heat island phenomenon of the city. Thus in order to decrease the temperature of asphalt pavement and to utilize glass cullet as a recycling material as an aggregate, some tests were carried out. In this study the specimen in which the cullet was entrapped in cold-laid paving materials and non-mixing specimen are made respectively, and the surface temperature of each specimen is measured by the thermal video camera. A set of tests have been conducted an...

  4. Characterization and modelling of self healing of bituminous materials towards durable asphalt pavement

    OpenAIRE

    Qiu, J.; Van de Ven, M.F.C.; Schlangen, H.E.J.G.; Wu, S.; Molenaar, A.A.A.

    2012-01-01

    The traffic volume and the number of heavy vehicles are growing enormously nowadays. There is a need for designing a durable asphalt pavement with innovative technologies. Pavement structures and materials with self healing and self repairing capability are believed to be very useful in such a system. This paper is aiming to understand the self healing behaviour through mechanical testing and finite element modelling. Instead of a complex and time consuming fatigue involved self healing inves...

  5. Modelling of Mechanical Properties of Cement Concrete Incorporating Reclaimed Asphalt Pavement

    OpenAIRE

    MATHIAS, Vincent; SEDRAN, Thierry; De Larrard, François

    2009-01-01

    In many countries there is a trend to recycle wastes obtained during pavement maintenance or reconstruction, and to forbid the landfill of these products. Thus, in some circumstances it can be tempting to use reclaimed asphalt pavement (RAP) in new hydraulic concrete mixtures. This paper presents experimental data and modelling about the effect of RAP incorporation on cement concrete mechanical properties (compressive strength, tensile strengths and E-modulus). All these properties tend to de...

  6. 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.

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

    OpenAIRE

    Weber Benedikt

    2015-01-01

    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 freq...

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

    OpenAIRE

    Nuha Salim Mashaan; Ali, Asim H.; Suhana Koting; Mohamed Rehan Karim

    2013-01-01

    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 ...

  9. Use of Reclaimed Asphalt Pavement (RAP) Under Superpave Specifications: A Regional Pooled Fund Project

    OpenAIRE

    McDaniel, Rebecca; Soleymani, Hamid; Shah, Ayesha

    2002-01-01

    This regional pooled fund project was conducted to investigate the performance of Superpave asphalt mixtures incorporating RAP. This study was closely coordinated with a national study on the same topic (NCHRP 9-12, Incorporation of Reclaimed Asphalt Pavement in the Superpave System). Specifically, this regional project looked at typical materials from the North Central United States to determine if the findings of NCHRP 9-12 were valid for Midwestern materials and to expand the NCHRP finding...

  10. Permanent Deformation of Asphalt Concrete Pavements: A Nonlinear Viscoelastic Approach to Mix Analyses and Design

    OpenAIRE

    Long, Fenella Margare

    2001-01-01

    Because pavements are being subjected to increasingly heavy loads, many mix design procedures currently in use may not adequately prevent permanent deformation (rutting) in asphalt concrete. This dissertation describes the development of a nonlinear viscoelastic constitutive model that can be used in mix analyses to design rut-resistant mixes. Shear deformation is the dominant cause of rutting in asphalt concrete, a nonlinear viscoelastic material. To determine the viscoelastic shear...

  11. 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.

  12. 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. PMID:24681366

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

    Directory of Open Access Journals (Sweden)

    V. A. Verenko

    2014-12-01

    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.

  14. PECULIAR FEATURES OF HEAT-HUMIDITY MODE PERTAINING TO POROUS LAYERS OF ASPHALT CONCRETE PAVEMENTS

    Directory of Open Access Journals (Sweden)

    V. Verenko

    2014-10-01

    Full Text Available The paper presents results of experimental investigations and points out the fact that conventional approaches to design and calculations of road pavements that presuppose application of porous asphalt concrete on compact bedding can cause some deformations and destructions initiated due to humidity migration in large internal material pores and lead to material destruction during warm season of the year when water is characterized by high activity. Such processes result in bitumen washing-out, white spot occurrence on the pavement and quick destruction of the pavement.The paper proposes to reconsider existing approaches to design and calculation of road pavements, estimation of reliability and service-ability levels of the applied construction materials. In particular it is necessary to calculate a road pavement with respect to thermo-physical action while excluding condensate and humidity accumulation in porous materials. 

  15. State-of-the-art guideline manual for design, quality control, and construction of sulfur-extended-asphalt (SEA) pavements

    Energy Technology Data Exchange (ETDEWEB)

    McBee, W.C.; Sullivan, T.A.; Izatt, J.O.

    1980-01-01

    Interest in the use of sulfur in highway pavement construction has been stimulated by unpredictable increases in cost and the relative uncertainty as to the future availability of asphalt cement (A/C) along with the potential surplus of sulfur in the near future. These events have led to the development of a new binder: a sulfur-extended-asphalt (SEA) binder. This new binder replaces some of the asphalt with sulfur in conventional asphalt paving plants. The mix material can be transported, laid, and compacted with standard paving equipment. Studies of SEA pavements indicate that their properties are comparable and in some cases may prove to be superior to those of conventional asphalt pavements. The manual presents state-of-the-art guidelines for design, quality control, safety factors, and construction of these newly developed pavements. A nonproprietary, direct mixing method and four proprietary methods of producing the SEA mixtures are described.

  16. Mix design of bituminous materials including reclaimed asphalt pavement

    OpenAIRE

    Dubois, Vincent; De La Roche, Chantal

    2008-01-01

    Reclaimed asphalt, obtained by milling of asphalt road layers can be re-used at once or stored. In the case of storage, an heterogeneity issue may occur when several types of materials, with different origins are mixed. At the scale of a storage zone or a stock pile, composition and properties of the reclaimed asphalts will be different, including variations of the final material properties, constraints for the stock manager, and the necessary adaptation of the manufacturing process. The recl...

  17. 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.

  18. FORECASTING OF DURABILITY OF ASPHALT PAVEMENT ON THE BASIS OF LEVELS OF THEIR VIBRATION LOADING

    Directory of Open Access Journals (Sweden)

    V. A. Osinovskaya

    2015-12-01

    Full Text Available The problem of low durability of flexible pavement is one of the most important problems of road economy. For example, the actual service life of asphalt pavement in Russia about 3 … 5 years. The bad condition of highways is an obstacle for the development of the national economy and leads to a significant annual economic losses.At present, this problem has no exact solution. Even at the seeming good road conditions of Europe and America the problem of low durability is no less important in these countries. And this problem becomes more and more actual every year.Our scientific researches allowed to make a hypothesis that the projected of pavements are not have the necessary durability yet not of a stage of designing because in strength calculations did not take into account the vibration of road constructions.Very actual the vibration loading becomes today as is now significantly changed the nature of loading of pavements. As a result the deflections of a pavements are reduced, but the increased vibration of pavements accelerated processes of destruction and significantly reduced durability.The theory of vibration destruction developed by the author allows to adjust the vibration, to form the vibration resistance pavements, and also to forecast a residual life of pavements that will more effectively develop repair actions.

  19. 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.

  20. 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.

  1. 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.

  2. Leaching of polycyclic aromatic hydrocarbons from new and reclaimed asphalt pavements

    OpenAIRE

    Legret, M.; ODIE, L; DEMARE, D; MONERON, P; Jullien, A.

    2005-01-01

    This work presented herein displays the results of a study addressing environmental concerns related to the possible leaching of pollutants from new and reclaimed asphalt pavement. Samples from an experimental site were tested in both static batch tests and columns leaching tests. Selected polycyclic aromatic hydrocarbons (PAHs) were analysed in leachates. The results have allowed us to consider the leaching of pollutants to be rather weak. Concentrations in solutions from batch leaching test...

  3. Leaching of heavy metals and polycyclic aromatic hydrocarbons from reclaimed asphalt pavement

    OpenAIRE

    Legret, M.; ODIE, L; DEMARE, D; Jullien, A.

    2005-01-01

    The work presented herein displays the results of a study addressing environmental concerns related to the possible leaching of pollutants from reclaimed asphalt pavement. Samples from an experimental site were tested in both static batch tests and column leaching tests. Selected heavy metals and polycyclic aromatic hydrocarbons (PAHs) were analysed in leachates. The results have allowed us to consider the leaching of pollutants to be rather weak for most of the parameters studied. Concentrat...

  4. Investigation of Primary Causes of Load-Related Cracking in Asphalt Concrete Pavement in North Carolina

    Science.gov (United States)

    Park, Hong Joon

    This dissertation presents causes of cracking in asphalt concrete pavement in North Carolina through field investigation and laboratory experiments with field extracted material. North Carolina is experiencing higher than anticipated rates of fatigue cracking compared to other state. These higher than expected rates could be reflective of the national trends in mix design practice or could be caused by structural pavement failures. The problems associated with premature cracking in North Carolina pavements point to the need to evaluate the North Carolina Department of Transportation (NCDOT) mixes, processes, and measures to ensure that these factors properly balance the goals of preventing cracking and minimizing permanent deformation. Without solid data from in-service pavements, any conclusions regarding the causes of these failures might be pure conjecture. Accordingly, this research examines material properties through laboratory experiments using field-extracted materials and investigates in situ pavements and pavement structure. In order to assess condition of existing pavement, alligator cracking index (ACI) was developed. The asphalt content in the top layer that exhibits top-down cracking or bottom-up cracking has a proportional relationship to ACI values. The air void content in a bottom layer that exhibits top-down cracking or bottom-up cracking shows an inverse proportional relationship to ACI values. These observations reflect reasonable results. A comparison between ACI and asphalt film thickness values does not produce noteworthy findings, but somewhat reasonable results are evident once the range of comparison is narrowed down. Thicker film thicknesses show higher ACI values. From field core visual observations, road widening is identified as a major cause of longitudinal cracking. Regions with observed layer interface separation tend to have low ACI values. Through tensile strain simulation based on actual field conditions, it is observed that

  5. 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.

  6. Using Pyrolized Carbon Black (PCB) from Waste Tires in Asphalt Pavement (Part 2, Asphalt Binder)

    OpenAIRE

    Zeng, Yongdong; Lovell, C. W.

    1996-01-01

    Scrap tires derived from automobiles have become a large environmental problem in the United States. In this study, research is carried out to investigate the potential use of tire-derived pyrolyzed carbon black from scrap tires as an asphalt cement modifier. The asphalt cements used in this research were AC10 and AC20. Penetration and softening point tests were performed to obtain the consistency of the asphalt cements. The pyrolyzed carbon black, as provided by Wolf Industries, was comb...

  7. Dynamic modulus application in the asphalt compaction rheological model for pavement construction

    Directory of Open Access Journals (Sweden)

    N.A. Kondrashov

    2014-11-01

    Full Text Available This paper studies the existing hot-mix asphalt compaction technology and points out that designation of the appropriate asphalt rollers and working parameters has to be performed in accordance with mechanical characteristics of the layer. A way to avoid defects during the rolling process is proposed based on determination of material properties before starting asphalt compaction. Due to a large variety of used types and compositions of asphalt mixes, determination of their characteristics by practical consideration is impossible. The study considers the method for determination of asphalt mechanical properties based on implementation of the time-temperature superposition principle. A procedure for dynamic modulus computation at each stage of the compaction process has been developed. Comparison of calculation output with experimental data verifies the determined relation for dynamic modulus. Consideration of this parameter allowed developing a new mathematical formulation for the rheological model of roller-asphalt interaction. The conclusion is drawn pointing that application of the approach for the development of compaction technology based on calculation of dynamic modulus will result in enhanced pavement quality along with reduced labor expenditure and higher cost saving.

  8. 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.

  9. 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.

  10. About the sizes of elastomer particles in the asphalt concrete binder providing the maximum service life of pavements

    Science.gov (United States)

    Kaplan, A. M.; Chekunaev, N. I.

    2014-05-01

    It is noted that the durability of asphalt concrete pavements is determined by the time of the trunk cracks formation in the polymer-containing composites - in the modified by elastomers (e.g., by rubber) bitumenous binder of asphalt. Developed by the authors previously the theory of the cracks propagation in heterosystems [1] has allowed to investigate the problem of the cracks propagation in the rubber-bitumen composite. This investigations show that most effectively to prevente the trunk cracks formation in asphalt concrete can ultrafine rubber particles (150-750 nm) in a bitumenos binder of asphalt.

  11. 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

  12. 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.

  13. 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.

  14. 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.

  15. INFLUENCE OF WAVE RADIATION OF ROAD ASPHALT PAVEMENT ON LEVEL AND FREQUENCY OF SPECTRUM NOISE OF AUTOMOBILE TYRE

    Directory of Open Access Journals (Sweden)

    V. Peregon

    2010-01-01

    Full Text Available Experimental researches on indication of noise of an automobile tire, spectral characteristics of tyres noise and asphalt coverings at vehicle’s traction are carried out. It has been revealed that wave radiations of the road asphalt pavement do not influence on the level and frequency of the noise spectrum of an automobile tyre. The technique of the experimental researches has been carried out and presented.

  16. 浅谈沥青路面再生技术的研究与应用%Research and Application of Regeneration Technique of Asphalt Pavement

    Institute of Scientific and Technical Information of China (English)

    邢长生

    2014-01-01

    This article embarks from the asphalt pavement regeneration significance, analyzes the present situation of asphalt pavement regeneration, and the research and application of the regeneration technology of asphalt pavement are discussed in detail.%本文从沥青路面再生的意义出发,分析了沥青路面再生的现状,并且针对沥青路面再生技术的研究与应用进行详细探讨。

  17. Thermal and hydraulic analysis of multilayered asphalt pavements as active solar collectors

    International Nuclear Information System (INIS)

    Highlights: • A new type of asphalt solar collector has been introduced in this paper. • The common pipe network has been replaced for a highly porous asphalt layer. • The use of these collectors contributes to achieve current environmental targets. • Excellent thermal efficiencies have been obtained in the laboratory tests. • Further research is needed to increase the low flow rates achieved. - Abstract: The fulfillment of current environmental aims like reducing fossil fuel consumption or greenhouse gas emissions entails the development of new technologies that enable the use of cleaner, cheaper and renewable energies. Furthermore, the need to improve energy efficiency in buildings encourages scientists and engineers to find new ways of harvesting energy for later uses. The use of asphalt pavements as active solar collectors is introduced in this article. Several authors have studied the use of roads as an energy source before. However, a new technology is presented in which a multilayered pavement with a highly porous middle layer is used instead of a solar collector with an embedded pipe network. These collectors are fully integrated within the road infrastructure and may offer low cost solar energy for water heating. The paper includes a brief comment on the state-of-the-art. Then, a broad methodology is presented in which data, materials and procedures needed to run the tests are fully described. Finally, the results of the laboratory tests are stated and discussed. The prototype used in the laboratory provided excellent thermal efficiency. However, these good results contrast with the low flow rate levels registered during the tests. Thus, although this technology seems to be very promising, new experimental tests should be performed before an effective application is possible

  18. 沥青面层的疲劳等效温度%Fatigue Equivalent Temperature for Asphalt Pavements

    Institute of Scientific and Technical Information of China (English)

    谈至明; 吁新华

    2013-01-01

    The relationship between the fatigue life of an asphalt pavement and its average temperature, temperature gradients was discussed. Based on the equivalency principal of cumulative fatigue damage, a method for calculating the fatigue equivalent temperature for asphalt pavement was put forward, with reference to the pavement temperature field data collected from 95 regions of China over the years, the corresponding fatigue equivalent temperatures were calculated and analyzed, the correlation between the standard fatigue equivalent temperature and the altitude of asphalt pavement located, the characteristic asphalt pavement temperature (pavement surface average temperature over years and its standard deviation ) were summarized. Hence, the standard fatigue equivalent temperatures for asphalt pavements in 738 regions of China were calculated, for design purpose, a contour map of the standard fatigue equivalent temperatures was initially proposed. Moreover, the influences of various factors in the non-standard conditions on the fatigue equivalent temperature for asphalt pavement were analyzed, and a set of approximate formulas were given accordingly. At last, the reliability of the calculation method and corresponding results were validated by a comparative study.%分析了沥青面层疲劳寿命与面层温度的均值和梯度的相互关系.基于疲劳损伤等效原则,给出了沥青路面面层疲劳等效温度的计算方法.根据全国95个地区多年的路面温度场数据,对沥青面层疲劳等效温度进行了计算和分析,总结了沥青面层基准疲劳等效温度与地区海拔、路表温度特征值(多年路表温度均值和标准差)之间的回归关系,据此推算得到了全国738个地区的沥青面层基准疲劳等效温度值,并绘制了可供设计采用的全国沥青面层基准疲劳等效温度等值线图,归纳了非基准条件下各因素对沥青面层疲劳等效温度的影响规律,给出了各因素修正计算

  19. 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

  20. Reasons for Rut Caused by Asphalt Pavement Rheology%沥青路面流变产生车辙的原因分析

    Institute of Scientific and Technical Information of China (English)

    姜允庆

    2013-01-01

    Rheology means the changes of material stress and strain with time. Asphalt pavement means the compacted mixture with asphalt as binding material. The rut is the common disease of asphalt pavement. The paper focuses on the cause of the asphalt pavement rheology and produce ruts and influence.%  流变[rheology]指材料的应力、应变随时间变化而变化的现象。沥青路面[asphalt pavement]指在基层上铺筑以沥青为胶凝材料的混合料经压实成型的路面。车辙是目前沥青路面最常见的病害之一。本文重点介绍了沥青路面流变而引起车辙的原因及影响。

  1. Pavement performance of asphalt mixtures containing silica%硅石沥青混合料的路用性能

    Institute of Scientific and Technical Information of China (English)

    郭乃胜; 王聪; 赵颖华

    2014-01-01

    The boiling water test was used to investigate adhe-siveness between silica and asphalt with different contents of hydrated lime added .Based upon the design theory of graded anti-skidding asphalt mixtures , the coarse aggregates retained on the 4.75 mm sieve were adopted for silica , fine aggregates passing the 4.75 mm sieve and filler were utilized for lime-stone.Marshall design method was performed to determine gradation composition design of asphalt mixtures containing silica, and the experimental section of asphalt pavement con-taining silica was chosen for construction with tracking detec-tion at a typical region .Results show that adhesiveness be-tween silica and asphalt can be improved by the addition of hydrated lime at 2% by the weight of asphalt , and the per-formance test results of asphalt mixtures containing silica with 2% hydrated lime added can meet the requirements of the technical specifications ( JTG F40-2004 ) , especially that presents favorable moisture susceptibility .The experimental pavement conditions display an appreciable usage .The tex-ture depth and British pendulum numbers of experimental pavement is higher than that of common asphalt pavement at the same route.Moreover, the texture depth and British pen-dulum numbers along with increasing time exhibit lower de-crease than that of common asphalt pavement in terms of tracking detection results .This means silica, as a kind of acid aggregate , may be used in the highway asphalt pavement by using appropriate gradations composition design and anti-stripping agent , which can improve the skidding resistance of asphalt pavement .%采用水煮法分析添加不同掺量消石灰的硅石与沥青的黏附性.根据级配型抗滑沥青混合料设计理论,筛孔4.75 mm以上的粗集料采用硅石,4.75 mm以下的集料采用石灰岩.基于马歇尔设计法进行硅石沥青混合料配合比设计及路用性能检验,并选择具有代表性路段进行硅石沥青路面

  2. 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.

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

    International Nuclear Information System (INIS)

    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. - Highlights: • We compare PAH and azaarene concentrations in runoff from coal-tar- and asphalt-sealed pavement. • Concentrations in coal-tar-sealcoat runoff greatly exceeded those in asphalt-sealcoat runoff. • Decreases in azaarenes and LMW PAHs were offset by increases in HMW PAHs. • PAH concentrations in coal-tar-sealcoat runoff remained high for months after application. - Concentrations of PAHs in runoff from pavement with coal-tar-based sealcoat continue to be elevated for at least 3 months following sealcoat application

  4. Asphalt cement poisoning

    Science.gov (United States)

    Asphalt; Pavement ... The substances in asphalt that can be harmful are: Hydrocarbons Industrial glues Industrial solvents Tar ... Asphalt is found in: Road paving materials Roofing materials Tile cements Asphalt may also be used for ...

  5. 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。

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

    OpenAIRE

    Firdaus Chairuddin; Wihardi Tjaronge

    2014-01-01

    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 ...

  7. 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.

  8. Influencing Factors and Construction Control of Asphalt Pavement Evenness%沥青路面平整度的影响因素和施工控制

    Institute of Scientific and Technical Information of China (English)

    吴昊

    2012-01-01

    During the construction process of asphalt pavement, phenomena such as unevenness appear con- stantly. The factors that influence asphalt pavement evenness are summarized and relevant measures for improving pavement evenness are proposed.%在沥青路面施工过程中,经常会出现一些不平整的现象,对沥青路面平整度的影响因素进行总结,并提出提高路面平整度的相关措施。

  9. 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.

  10. 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.

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

    Institute of Scientific and Technical Information of China (English)

    2013-01-01

    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.%  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。

  12. Measurements of the stiffness and thickness of the pavement asphalt layer using the enhanced resonance search method.

    Science.gov (United States)

    Zakaria, Nur Mustakiza; Yusoff, Nur Izzi Md; Hardwiyono, Sentot; Nayan, Khairul Anuar Mohd; El-Shafie, Ahmed

    2014-01-01

    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. PMID:25276854

  13. 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.

  14. 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

  15. The Principle and Application of Asphalt Pavement Regeneration Technology%沥青路面再生技术的原理与应用

    Institute of Scientific and Technical Information of China (English)

    刘福军

    2014-01-01

    沥青路面再生技术是利用多种设备、工艺及技术,对沥青路面进行全面修复和再生,从而提高沥青路面稳定性,延长公路使用寿命的新型技术。本文对沥青路面再生技术的原理进行简单分析,探讨沥青路面再生技术的应用。%Asphalt pavement regeneration technology is a new technology to comprehensive repair and regeneration on the asphalt pavement by using a variety of equipments, process and technologies, so as to improve the stability of the asphalt pavement and prolong the service life of the road. In this paper, the author briefly analyzes the principle of asphalt pavement regeneration technology and discusses the application of as-phalt pavement regeneration technology.

  16. 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.

  17. 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。

  18. Application of CalME incremental-recursive method to the evaluation of the structural condition as asphalt pavements

    International Nuclear Information System (INIS)

    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. 橡胶沥青混凝土路面施工技术研究%Research on construction technology of rubber asphalt concrete pavement

    Institute of Scientific and Technical Information of China (English)

    李霞

    2015-01-01

    对传统路面与橡胶混凝土路面的性价比进行了分析比较,介绍了橡胶沥青混凝土路面的特点,并对其在工程中的应用技术进行了阐述,指出橡胶沥青混凝土路面具有显著的经济、社会、环境效益,应用前景广阔。%This paper analyzed and compared the cost performance of traditional pavement and rubber concrete pavement, introduced the charac-teristics of rubber asphalt concrete pavement, and elaborated its application technology in engineering, pointed out that the rubber asphalt con-crete pavement had significant economic, social, environmental benefits, had wide application prospect.

  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.

    2014-01-01

    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.

  1. Comparison of Surface Characteristics of Hot-Mix Asphalt Pavement Surfaces at the Virginia Smart Road

    OpenAIRE

    Davis, Robin Michelle

    2001-01-01

    Pavement surface characteristics are important to both the safety of the pavement surface and the comfort of the drivers. As of yet, texture and friction measurements have not been incorporated into the design of pavement surfaces. Seven different wearing surface mixtures, placed at the Virginia Smart Road pavement facility, were studied over a one year time period for both friction and texture properties. A locked wheel skid trailer and a laser profilometer were used to assess the pavemen...

  2. 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.

  3. Analysis of Factors Influencing the Asphalt Concrete Pavement Compactness%沥青混凝土路面压实度的影响因素分析

    Institute of Scientific and Technical Information of China (English)

    李彩妹

    2013-01-01

    Compactness is an important step in the construc-tion of asphalt concrete pavement compaction, it can not only ensure the pavement, improve pavement compaction smoot-hness, is also very ef ective for the lower porosity, and can effectively improve the pavement friction, has significant eff-ect on resistance against stress and crack resistance, so stud-ying on the science compaction of asphalt concrete pavement, analyzing the factors affecting the compaction degree of the concrete pavement, control ing these factors, can ef ectively improve the quality of pavement.%沥青混凝土路面施工重要的一个步骤是压实,它不但能确保路面的密实、提升路面的平整度,对降低空隙率也是非常有效果的。而且能有效提升路面摩擦力,对抵抗自然侵害力以及抗裂能力有显著的作用。所以只有研究科学的沥青混凝土路面压实,分析影响混凝土路面压实度的因素,控制好这些因素,才能有效地提高路面的质量。

  4. Asphalt Materials Characterization in Support of Implementation of the Proposed Mechanistic-Empirical Pavement Design Guide

    OpenAIRE

    Flintsch, Gerardo W.; Loulizi, Amara; Stacey D. Diefenderfer; Khaled A. Galal; Diefenderfer, Brian K.

    2007-01-01

    The proposed Mechanistic-Empirical Pavement Design Guide (MEPDG) procedure is an improved methodology for pavement design and evaluation of paving materials. Since this new procedure depends heavily on the characterization of the fundamental engineering properties of paving materials, a thorough material characterization of mixes used in Virginia is needed to use the MEPDG to design new and rehabilitated flexible pavements. The primary objective of this project was to perform a full hot-mix a...

  5. Causes of Expressway Asphalt Pavement Diseases and Prevention Measures%浅谈高速公路沥青路面病害成因及防治措施

    Institute of Scientific and Technical Information of China (English)

    侯利荣

    2014-01-01

    针对高速公路通车后,沥青路面出现的病害类型,提出沥青路面病害成因,阐述高速公路沥青路面病害的防治措施。%For the problems of asphalt pavement diseases after the opening of highway, this paper analyses the causes of asphalt pavement diseases, and proposes the preventive measures for diseases of expressway asphalt pavement.

  6. 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 combu...

  7. 隧道沥青路面专用养护剂的阻燃性和路用性能研究%Study on Flame Retardance and Pavement Performance of Special Maintenance Agent for Tunnel Asphalt Pavement

    Institute of Scientific and Technical Information of China (English)

    吕春飞

    2013-01-01

    In connection with a new flame-retardant maintenance agent for tunnel asphalt pavement, study is carried out to the extent that the flame retardance and the function of aging resistance or slowing are evaluated, and then the effect of the agent on waterproofness and sliding resistance of tunnel asphalt pavement is inspected. The result shows that the maintenance agent can effectively improve the oxygen index of asphalt and, at the premise of the sliding resistance almost not decreased, improve the waterproofness of tunnel asphalt pavement.%对具有阻燃作用的隧道沥青路面专用养护剂进行了研究,对该养护剂的阻燃性和在防止或减缓沥青老化方面的功能进行评价,着重考察其对隧道沥青路面不透水性和抗滑性能的影响.研究结果表明:专用养护剂能有效提高沥青的氧指数,且在几乎不降低抗滑性能的前提下提高隧道沥青路面的不透水性.

  8. 沥青路面动力响应分析方法研究%Study on Dynamic Response Analysis Method of Asphalt Pavement

    Institute of Scientific and Technical Information of China (English)

    2012-01-01

    西部交通建设科技项目“沥青路面动力响应分析方法研究”旨在建立车辆-道路系统动力学模型,研究高速重载车辆荷载作用下沥青路面结构的动力响应情况,分析动力载荷对沥青路面结构使用性能的影响,从而提出适合重载交通条件的沥青路面动力响应理论分析方法。本篇对该项目的技术创新点、主要研究成果、社会经济效益及推广应用前景进行了介绍,为今后沥青路面的结构改造与设计提供理论依据。%Editor's Notes. The traffic construction technology project in westem China,Study on Dy- namic Response Analysis Method of Asphalt Pavement',is to establish the dynamic model of vehicle-read system,to study the dynamic response situation of asphalt pavement structure under the load effect of high speed haavy-load vehicles,and to analyze the effect of dynamic loads on the using performance of asphalt pavement structural,thus the article proposed the theoretical analysis method of asphalt pavement dynamic response suitable for the heavy traffic conditions. The article introduced the technical innovation points,main study findings, social economic benefits and promotion application prospects of this project, providing the theoretical basis for the future structure transformation and design of asphalt pavement.

  9. 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.

  10. Compaction of asphalt road pavements : using finite elements and critical state theory

    OpenAIRE

    Huerne, ter, H.L.

    2004-01-01

    The objective of this research was to investigate whether it is possible to develop a tool that enables simulation of a compaction process of asphalt for construction of roads, and how this is best done.

  11. 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.

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

    OpenAIRE

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

    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 i...

  13. 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.

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

    International Nuclear Information System (INIS)

    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 the assumption of random nucleation and nuclei growth, whereas the limestone decomposition stage appears to follow the one-dimensional phase boundary model. (electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics)

  15. 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。

  16. 超载作用下沥青混凝土路面的受力特性分析%Stress Analysis of Asphalt Concrete Pavement Under Overload

    Institute of Scientific and Technical Information of China (English)

    崔学民; 陈德华

    2012-01-01

    Based on the breakage of asphalt concrete pavement of Foshan-Kaiping Expressway, elastic layered theory is used to analyze the stress and deformation of the overloaded asphalt concrete pavement, the effects of overloaded vehicles on stress characteristics and fatigue lifetimes are discussed theoretically.%根据佛开高速公路沥青混凝土路面破损情况,应用弹性层状体系理论分析沥青混凝土路面在超载作用下的应力和变形,从理论上探讨超载车辆对路面的受力特性和疲劳寿命产生的影响.

  17. 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.

  18. Spanish experience with the application of gyratory compactor and indirect tensile test in design and control of cold recycled asphalt pavement

    OpenAIRE

    Martínez Reguero, Adriana Haydée; Miró Recasens, José Rodrigo; Pérez Jiménez, Félix Edmundo

    2007-01-01

    This paper summarizes the Spanish experience in the design and control of cold in-place recycling (CIR) of asphalt pavements. First, the results obtained in laboratory after the mixture design process are compared with the densities encountered in the field. Second, the application of the Superpave Gyratory Compactor (SGC) for specimen manufacture during the design stage is analyzed by varying the standard conditions of gyration angle and vertical pressure. Finally, a new design method ...

  19. Practical research on the modified rubber powder asphalt pavement engineering%橡胶粉改性沥青路面工程实践研究

    Institute of Scientific and Technical Information of China (English)

    孟建建; 勾煜

    2012-01-01

    Through comprehensively considering features and influential factors of rubber powder asphalt, the paper describes the production and construction technology of the new rubber power modified asphalt pavement from aspects of raw material selection of rubber powder, basic asphalt, coarse aggregate, fine aggregate and filling materials, the design and production, transportation, paving and rolling and forming of rubber powder asphalt mixture. Practice proves that rubber powder asphalt pavement has great effect of bleeding and sliding resistance and noise resistance. Through nearly two years' operation and return visit, it turns out that the pavement eveness is good without potholes. In addition, the proprietors are satisfied with the highway conditions.%综合考虑橡胶粉沥青的特点及其影响因素,从橡胶粉、基质沥青、粗集料、细集料和填料等原材料的选用,橡胶粉沥青混合料的设计与生产、运输、摊铺以及碾压成型等角度,详细阐述了一种新型的橡胶粉改性沥青路面的生产与施工工艺,实践证明:橡胶粉沥青路面具有良好的泌水性和抗滑、防噪效果,经过近两年的运行和回访表明,路面平整度等状况良好,无车辙、无坑洞,业主反映较好。

  20. Research on heat transfer mechanism and thermal characteristics of heat transfer asphalt pavement%调热沥青路面调热机理及调热特性研究

    Institute of Scientific and Technical Information of China (English)

    乔华

    2015-01-01

    为研究保水路面、热阻路面和储热路面的调热特性,对三种调热路面的调热机理进行了分析;通过成型三种调热路面试件和普通沥青路面试件,并在试件底部设置温度传感器,采用温度采集仪对四种路面的温度变化数据进行了采集,研究结果表明,储热路面的温度变化相对于普通沥青路面存在一定的滞后性;三种调热路面均能降低路面温度,但降低幅度保水路面最大,热阻路面居中,储热路面最小。%For the study of the thermal characteristics of water-retention pavement,thermal resistance pavement,heat storage pavement,the heat transfer mechanism of three kinds of heat transfer asphalt pavement was analyzed;the three kinds of heat transfer asphalt pavement specimens and normal asphalt pavement specimens were formed,and the temperature sensors were set at the bottom of specimens,and the temperature data of four kinds of pavement were collected. The results show that the temperature change of heat storage pavement lags behind the normal asphalt pavement;all the three kinds of heat transfer pavements can effectively reduce the pavement temperature,but the water-retention’s cooling effect is the best,thermal resistance is center,thermal storage’s cooling effect is poorer.

  1. FEM analysis of dynamic behavior of asphalt pavement structure weakened by grassroots with account of hydraulic and vehicle load coupling effects

    Science.gov (United States)

    Huang, J.; Pan, X.; Dai, S. B.; Cai, Y.

    2015-12-01

    This paper establishes the finite element model of saturated asphalt pavement with ANSYS. The thickness and elastic modulus of pavement surface layers and grassroots are taken as influencing factors to analyze the influence of these factors’ change on the pavement mechanical behavior. The results indicate that the increase of surface thickness leads to the shear stress's decrease that may relieve the internal shear stress concentrated phenomenon effectively. The increase of elastic modulus of surface makes the pore pressure decrease, and result in the shear stress's increase. The grassroots thickness has no obvious effect on the pore- water pressure and shear stress; the grassroots elastic modulus’ increase may increase the internal shear stress and decrease the pore pressure.

  2. 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。

  3. 论改性沥青路面施工技术%Discussion on the construction technology of modified asphalt pavement

    Institute of Scientific and Technical Information of China (English)

    王秀娥

    2015-01-01

    对胶粉改性沥青混合料的配合比设计流程及其设计要点进行了分析,介绍了胶粉沥青混合料的生产流程,并对改性沥青路面施工技术的具体应用过程进行了研究,以提升该技术手段在今后公路施工中的应用水平。%This paper analyzed the mixture proportioning design process and its design key points of rubber powder modified asphalt,introduced the production process of rubber powder asphalt mixture,and researched the specific application process of modified asphalt pavement construc-tion technology,in order to enhance the application level of this technology in future highway construction.

  4. GREENPATCH® - Cold Mix Asphalt

    OpenAIRE

    ECT Team, Purdue

    2013-01-01

    GreenPatch® is environmentally friendly cold asphalt that is a direct replacement for traditional cold patch in repairing asphalt pavements. This revolutionary breakthrough in the cold asphalt industry contains no petroleum based softeners such as diesel, toluene, kerosene, and naphthalene found in conventional cold asphalt that pose serious threats to human health and the environment.

  5. 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

  6. Exploring the Ageing Effect of Binder on Skid Resistance Evolution of Asphalt Pavement

    OpenAIRE

    Kane, Malal; ZHAO, Dan; Do, Minh Tan; Chailleux, Emmanuel; DE LARRARD, Francois

    2010-01-01

    One of the most important safety requirements of a road is its capability of preventing skidding of vehicles. However, this requirement so called "skid resistance" evolves during the whole pavement life. Phenomena that are identified to be responsible of this evolution are binder removal, aggregate polishing and seasonnal variations. In addition, ageing of bitumen is also identified to play a significant role on skid resistance evolution. One of the main results of previous works about skid r...

  7. 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.

  8. Evaluation of the effect of aggregate mineralogy on the durability of asphalt pavements

    OpenAIRE

    Anastasio, Sara

    2015-01-01

    Shape, gradation, hardness and texture are among the aggregate characteristics necessary to consider during the asphalt mixture design process. However these characteristics do not provide direct information on the compatibility between the aggregate and the bitumen, nor do they give any indication on how this compatibility evolves when other factors as water, additives and other chemicals interact with the mixture. Other aspects, such as aggregate chemistry, can also significa...

  9. 基于抗裂的沥青路面合理结构研究%Study on Structural Design of Anti-cracking Asphalt Pavement

    Institute of Scientific and Technical Information of China (English)

    柴彩萍

    2012-01-01

    In this paper, a special road design program is used to analyze the stress value and distribution of the semi rigid asphalt pavement under normal tire pressure. Based on calculating analysis, some conclusions are obtained, such as the change law of the stress in layer bottom caused by the altering of construction mechanics parameters, the rational as- phalt pavement construction based on the change law which could avoid the fatigue cracking and reflection cracking and the design direction of anti-cracking asphalt pavement' s material composition. The research resuhs would have theoretical reference value for the structural design of semi-rigid asphalt pavement.%利用专门的道路设计程序,对半刚性基层沥青路面进行结构力学计算。通过沥青路面内的应力大小和分布分析,得到层底拉应力随结构力学参数(各材料层厚度、模量及结构形式)变化规律,据此提出避免沥青面层疲劳开裂和半刚性基层反射裂缝的沥青路面合理结构,并指出基于抗裂的沥青路面材料组合设计方向。研究结果对半刚性基层沥青路面结构组合设计具有理论参考价值。

  10. Typical Structure of Bridge Deck Asphalt Pavement of Cement Concrete Bridge%水泥混凝土桥沥青铺装典型结构研究

    Institute of Scientific and Technical Information of China (English)

    何德云; 熊欣; 董强

    2011-01-01

    Vehicle's safety and comfort has been directly affected by the quality of bridge deck pavement, and the quality of bridge deck pavement has been directly affected by the composite structure of bridge deck pavement. Through the interlayer cohesive tests with 7 sorts of materials, temperature stability and fatigue bending tests with 3 composite structures, the performance sequence of interlayer cohesive materials and asphalt composite structures have been confirmed. On the basis of the test results, the typical structure of bridge deck pavement has been proposed, which offers references for the design and construction of bridge deck pavement.%桥面铺装的质量直接影响着行车的安全性和舒适性,桥面铺装的结构组合又直接决定了桥面铺装的质量.通过对7种桥面铺装层材料的层间黏结性能试验、3种桥面铺装组合结构的温度稳定性试验和复合小梁弯曲疲劳试验,确定了桥面铺装层间黏结材料和沥青铺装结构的性能排序,在此基础上提出了桥面铺装的典型结构型式,可为桥面铺装设计和施工提供参考.

  11. 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。

  12. The use of crushed rubber in asphalt mixtures of road pavements

    OpenAIRE

    Holubka, Mariya; Salaiová, Brigita

    2013-01-01

    The presented article gives a brief overview on the possible use of crushed rubber from waste tires in asphalt mixtures. Advantages, disadvantages and difficulties of its use in road construction are also discussed. The results of sieve analysis and thermal analysis obtained on the samples prepared from waste rubber are discussed. The use of recycled tire rubber in road construction can contribute significantly to the reduction of environmental load. Коротко описано можливості застосу...

  13. 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.

  14. Analysis for Critical Range of Key Indices in Preventive Maintenance of Asphalt Pavement%沥青路面预防性养护关键指标临界范围浅析

    Institute of Scientific and Technical Information of China (English)

    张逆

    2015-01-01

    沥青路面使用性能关键指标的临界范围是确定路面所处状态、选择路面养护时机的关键参数. 针对高速公路沥青路面预防性养护时机问题,结合国内外研究成果及我国沥青路面实践,探讨并明确路面使用性能关键指标如路面状况指数(PCI)、平整度指数(IRI)、路面车辙(RD)、横向力系数(SFC)等的临界值范围,为我国高速公路管理部门选择沥青路面预防性养护时机提供参考.%The critical range of key indices of application performance of asphalt pavement is a key parameter for determining pavement status and selection of maintenance opportunity of pavement. In allusion to the problem of preventive maintenance opportunity of asphalt pavement of expressways and in combination with foreign research achievements and our national practices of asphalt pavement, this paper probes into and makes clear the range of critical values of key indices of pavement application performance such as pavement condition index ( PCI ) , international roughness index ( IRI ) , rut of pavement ( RD ) and side - way force coefficient ( SFC ) , etc. to provide a reference for our national expressway management departments to select preventive maintenance opportunity of asphalt pavement.

  15. Discuss the Processing and Precaution of Asphalt Pavement%小议沥青路面裂缝的处理及其预防措施

    Institute of Scientific and Technical Information of China (English)

    王辉

    2013-01-01

    The asphalt pavement is the commonly used flexib-le pavement in our current road, which has the advantages of carrying big capacity, high strength and strong ability to resist fatigue. The drawback is brit leness, easy to produce cracks w-hen the large difference of temperature and poor resistance to deformation ability. In this article, the author put forward some measures to prevent cracks in the asphalt pavement.%  沥青路面是我国目前公路中比较常用的柔性路面,它的优点是承载力大、强度高并且抗疲劳能力强。缺点是脆性大、温差大时易产生裂缝、抗变形的能力差。本文针对沥青路面中常见的一些裂缝提出了一些预防措施。

  16. Performance of asphalt rubber mixtures

    OpenAIRE

    Thives, Liseane Padilha; Trichês, Glicério; Pereira, Paulo A. A.; Pais, Jorge C.

    2010-01-01

    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: terminal blending (produced at industrial plants) and continuous blending (produced in asphalt plants). This study presents a laboratory evaluation of asphalt rubber mixtures produced with d...

  17. 沥青路面线性疲劳损伤特性及形变规律%Linear fatigue damage characteristics and deformation law of asphalt pavement

    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 the deformation of the asphalt pavement under vehicle load, using the general finite element software ABAQUS and the secondary development platform, an asphalt pavement numerical model which considers the pavement material fatigue damage is established to analyze the spatial distribution and evolution of asphalt pavement structure damage and horizontal normal strain, as well as the evolution law of the deflection on the surface of the pavement. The results show that the pavement structural damage mainly distributes in a specific damage zone that is located at the bottom of the layer and along the middle line between the double wheels. With the increase of the load cycles, the damage degree at the bottom of the base layer and the sub-base layer increases, the rate of which gradually decreases. Meanwhile, the horizontal tensile strain close to the bottom of the pavement layer increases, the rate of which gradually decreases, and neutral axis moves upward. The deflection on the surface of the pavement increases with the increase of load cycles, the rate of which decreases gradually. The results can provide a theoretical support for the asphalt pavement structure design, the maintenance and the prediction of the long-term performance.%为了研究沥青路面结构在车辆荷载作用下的疲劳损伤演化特性并分析其形变规律,运用通用有限元软件ABAQUS及其二次开发平台,建立考虑路面材料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和水平正应变的空间分布与演化规律,以及路表弯沉随荷载作用的演变规律.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,基层层底与底基层层底损伤度随荷载作用均增加,但增加幅度逐渐减小;路面结构层内水平正应变在荷载作用下,靠近层底位置拉应变逐渐增大,但增

  18. 谈橡胶沥青混凝土路面的施工%On construction of rubber asphalt concrete pavement

    Institute of Scientific and Technical Information of China (English)

    李义

    2012-01-01

    Combining the working experience,the paper introduces the construction technique of the rubber asphalt concrete pavement by taking some projects as the example,and illustrates the operation points for some key procedure,including the mixing of the rubber asphalt,the transportation,the paving,and the roller compaction,so as to direct the practice.%结合自身工作经验,以具体工程为例,介绍了橡胶沥青混凝土路面施工技术,分别阐述了橡胶沥青的搅拌、运输、摊铺、碾压等关键工序的操作要点,以期指导实践。

  19. 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.

  20. 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.

  1. 脱硫橡胶沥青溶胀原理及路用性能%Swelling Principle and Pavement Performance of Desulfurized Rubber Asphalt

    Institute of Scientific and Technical Information of China (English)

    杨毅文; 袁浩; 马涛

    2012-01-01

    分别从微观和宏观对脱硫橡胶及其橡胶沥青进行了研究,并用普通废胎橡胶及其橡胶沥青进行了对比.通过溶解试验发现脱硫橡胶的溶解性远大于普通橡胶,回收脱硫橡胶中仅有极少的橡胶颗粒存在.红外光谱表明脱硫橡胶颗粒较普通废胶粉含有更多的活性化学键,具有较低的交联度.脱硫橡胶沥青在相同温度下粘度较低同时也兼具较好的稳定性.建立了脱硫橡胶沥青的溶胀模型.比较了2种橡胶沥青的路用性能,发现脱硫橡胶的粘度和低温延度要好于普通橡胶沥青,其他性能则略差,并用溶胀模型进行了解释.%The desulfurized rubber and its rubber asphalt were studied from macro and micro aspects respectively, and the performance comparison between crumb rubber asphalt and desulfurized rubber asphalt was conducted. The result of solubility test show that the solubility of desulfurized rubber is much better than that of crumb rubber, and few rubber particle existed in the recycled desulfurized rubber. The infrared spectra show that the desulfurized rubber particle contains more additives and active chemical bond compared . To crumb rubber powder, and the former has less cross-linking, resulting in lower viscosity and better stability at the same temperature. A swelling model for desulfurized rubber asphalt was established, and the pavement performance of two kinds of rubber asphalt was compared. It is found that the viscosity and low-temperature ductility of desulfurized rubber is better than those of ordinary rubber asphalt except other pavement performance, which was explained by the swelling model.

  2. 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...

  3. Analysis on Superpave-20 asphalt pavement construction technology at Tianshui cross-boundary section%天水过境段Superpave-20沥青路面施工工艺分析

    Institute of Scientific and Technical Information of China (English)

    张海红

    2011-01-01

    摘要:通过对Superpave沥青混合料施工和现场施工工艺的分析,提出Superpave沥青路面施工质量控制方法,为提高沥青路面施工质量提供一些有益的参考。%Through analyzes the Superpave asphalt mixture construction and site construction technology, and proposes Superpave asphalt pave- ment construction quality control methods, which has provided some beneficial reference for improving asphalt pavement construction quality.

  4. 沥青混凝土的动水压力模拟试验%Simulation Test of Dynamic Water Pressure for Asphalt Pavement

    Institute of Scientific and Technical Information of China (English)

    姜旺恒; 张肖宁; 李智

    2011-01-01

    The simulation method of dynamic water pressure is one of the basic theories which should be researched to improve the water damage resistance of asphalt mixture. On the basis of designing the test system which generates dynamic water pressure in the voids of asphalt concrete by compressed air, the cylindrical asphalt concrete specimen, which has a space on its bottom and covered with epoxy resin glue on its lateral, was made to induct the water flow oriented through asphalt concrete voids to the established space, thus the oriented water erosion mode was formed. It is found by FEM that (1) the drainage could reduce the pore pressure in the specimen along its depth, which means pore pressure condition in voids of semi-rigid base asphalt pavement is harsher than that in drainage base asphalt pavement. It is found from the test by this specimen that ( 1 ) the splitting strength of the specimen decreased gradually due to water erosion; ( 2 ) powder escaped from asphalt concrete, shear failure occurred, and asphalt film stripped from the damaged surface during the oriented water erosion to the specimen at 60 ℃, which reveals that the effect of simulated dynamic pore pressure is significant; (3) asphalt mixture with void ratio about 8% has minimum resistance to water damage. These phenomena and test results reveal that the method is feasible for evaluating the water damage resistance of asphalt concrete.%动水压力模拟试验方法是提高沥青混合料抗水损害性能需要研究的基础理论问题之一.在设计以气压传递激发沥青混凝土孔隙中水压动态变化的试验装置的基础上,通过封闭圆柱形试件的侧壁和在试件底端构造蓄水空间以引导水在孔隙中向下渗流,形成定向冲刷模式.经有限元计算发现随试件深度增加水压减小,说明半刚性基层沥青路面比排水基层沥青路面承受的水压力条件更严酷.应用该试验装置发现动水冲刷使试件

  5. Research on Fatigue Properties of Reclaimed Asphalt Pavement%热再生沥青混合料的疲劳特性研究

    Institute of Scientific and Technical Information of China (English)

    董玲云; 何兆益; 黄刚; 王国伟; 侯俊

    2013-01-01

    针对渝长高速公路废旧沥青混合料,对新拌沥青混合料AC-16和RAP掺量分别为10%,30%,50%的再生AC-16进行长期老化前后的间接拉伸疲劳试验.引入疲劳寿命比Nf(k/n)和疲劳寿命损失率F(k)的概念,对再生沥青混合料疲劳特性的变化规律进行了系统评价.试验结果表明:随RAP掺量的增加,再生沥青混合料的疲劳寿命比降低,且老化后的疲劳寿命比要小于老化前,且疲劳寿命损失率增加.%Aiming at RAP (reclaimed asphalt pavement) of Yu-Chang freeway,the indirect tensile fatigue tests are carried out between a fresh asphalt mixture of AC-16 and the reclaimed AC-16 with RAP mixing amount 10,30,and 50 respectively,before and after the long-term aging.The fatigue life ratio Nf(k / n) and fatigue life loss ratio F (k) are introduced to systematically analyze the variation of the fatigue properties of the reclaimed asphalt mixture.Test results show that:with the increase of RAP amount,the reclaimed asphalt mixture fatigue life ratio decreases ; meanwhile,the age of fatigue life ratio of the reclaimed asphalt mixture is less than that before aging,and the fatigue life loss ratio increases.

  6. Impact of Surface Temperature on Fatigue Damage in Asphalt Pavement%路表温度对沥青路面疲劳损伤的影响

    Institute of Scientific and Technical Information of China (English)

    韦璐; Sascha KAYSER; Frohmut WELLNER

    2013-01-01

    To evaluate anti-fatigue performance of asphalt pavement impacted by temperature effectively and solve the problem of inaccurately prediction of fatigue damage by adopting a single fixed temperature, the impact of different surface temperatures and their combinations on fatigue damage in asphalt pavement is analyzed based on Miner law of accumulated fatigue damage, taking the temperature field prediction model of asphalt pavement provided by Dresden University of Technology in Germany for example. According to plenty of measured surface temperature data, different surface temperature combinations and their representative values in temperature intervals are determined and the change regularity of fatigue damage in asphalt pavement is studied. The analysis result shows that (1) the fatigue damage predicted by adopting surface temperature combinations is more accurate than that predicted by adopting a single fixed temperature; (2) when the number of temperature intervals forming temperature combination is much more, the predicted fatigue damage in asphalt pavement is more accurate, while when the number of temperature intervals was much less, the fatigue damage impacted by representative values in temperature intervals varies obviously; (3) the fatigue damage impacted by high temperature ( or upper limit) for representative value of temperature intervals is larger than the one by low temperature (lower limit).%为准确评价温度影响下沥青路面结构的抗疲劳性能,解决采用某单一固定温度预估疲劳损伤不够精确的问题,以德国德累斯顿工业大学提出的路面温度场预估模型为例,基于Miner疲劳累积损伤定理,分析路表不同温度及其组合对沥青路面疲劳损伤的影响.通过大量实测的路表温度数据,确定不同的路表温度组合及其组合内温度区间的温度代表值,研究路面结构疲劳损伤变化的规律.分析结果表明:采用由多个温度区间组成的路表温度组合预

  7. Fatigue Characteristics Analysis of Large Thickness Asphalt Pavement of Tong-ping Expressway%通平高速公路大厚度基层沥青路面疲劳特性分析研究

    Institute of Scientific and Technical Information of China (English)

    何杰

    2012-01-01

    In this paper, the author combines Tong-ping expressway engineering practice, through calculation and analysis of different interlayer bonding state of the large thickness of asphalt pavement of semi rigid base asphalt pavement with ordinary mechanical properties and fatigue characteristics, draw the total thickness of the same thickness of asphalt pavement is superior to ordinary asphalt pavement of semi rigid base of the conclusion.%结合通平高速公路的工程实践,通过计算分析不同层间粘结状态下的大厚度基层沥青路面与普通半刚性基层沥青路面的力学特性和疲劳特性,得出了总厚度相同的大厚度基层沥青路面要明显优于普通半刚性基层沥青路面的结论.

  8. Several Problems of Recycled Asphalt Macadam Pavement Needing Attention in Construction%再生沥青碎石面层施工中应注意的几个问题

    Institute of Scientific and Technical Information of China (English)

    杨祖炎

    2012-01-01

    The pollution of waste asphalt pavement material and funding pressures of new highway are two problems that cannot be neglected in the development process of the road, and asphalt pavement recycling technology is the effective way to resolve the issues. This paper analyzes some issues of the recycled asphalt construction should pay attention to.%废旧沥青路面材料的污染问题和新建公路的资金压力问题,是公路事业发展过程中不可忽视的两个问题,而沥青路面再生技术就是解决这一系列问题的有效途径,本文分析了再生沥青施工中应该注意的一些问题.

  9. Explore the Measures of Asphalt Subgrade Pavement and Flatness in Highway Engineering%探讨公路工程中沥青路基路面及平整度措施

    Institute of Scientific and Technical Information of China (English)

    吕国锋

    2013-01-01

    In the highway engineering construction, the asph-alt subgrade pavement construction affects the quality of the whole project. In order to ensure the flatness of the pavement, people need to control the subgrade and pavement construction. This article analysis the influencing factors of asphalt subgrad-e pavement construction, and put forward a number of technic-al measures to improve the flatness of subgrade pavement, a-ims at improving the construction level of subgrade pavement.%  在公路工程施工中,沥青路基路面的施工影响着整个工程的质量。要想保证公路路面的平整,就要做好路基路面的施工控制。本文就影响沥青路基路面施工的因素做了分析,提出了一些提高路基路面平整度的技术措施,希望能够提高路基路面的建设水平。

  10. 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。

  11. Pavement evaluation and rehabilitation

    Energy Technology Data Exchange (ETDEWEB)

    Ali, N.A.; Khosla, N.P.; Johnson, E.G.; Hicks, R.G.; Uzan, J.

    1987-01-01

    The 20 papers in this report deal with the following areas: determination of layer moduli using a falling weight deflectometer; evaluation of effect of uncrushed base layers on pavement performance; the effect of contact area shape and pressure distribution on multilayer systems response; sensitivity analysis of selected backcalculation procedures; performance of a full-scale pavement design experiment in Jamaica; subsealing and load-transfer restoration; development of a demonstration prototype expert system for concrete pavement evaluation; numerical assessment of pavement test sections; development of a distress index and rehabilitation criteria for continuously reinforced concrete pavements using discriminant analysis; a mechanistic model for thermally induced reflection cracking of portland cement concrete pavement with reinforced asphalt concrete overlay; New Mexico study of interlayers used in reflective crack control; status of the South Dakota profilometer; incorporating the effects of tread pattern in a dynamic tire excitation mechanism; external methods for evaluating shock absorbers for road-roughness measurements; factor analysis of pavement distresses for surface condition predictions; development of a utility evaluation for nondestructive-testing equipment used on asphalt-concrete pavements; estimating the life of asphalt overlays using long-term pavement performance data; present serviceability-roughness correlations using rating panel data; video image distress analysis technique for Idaho transportation department pavement-management system; acceptability of shock absorbers for road roughness-measuring trailers.

  12. 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.

  13. Impact on Pavement Performance of Anti-stripping Impact on Pavement Performance of Anti-stripping Agent in Granite Asphalt Mixture Agent in Granite Asphalt Mixture%抗剥落剂对花岗岩沥青路用性能的影响研究

    Institute of Scientific and Technical Information of China (English)

    李经辉

    2016-01-01

    In this paper,a way to improve bitumen properties and the adhesion between bitumen and aggregate is proposed by adding two anti-stripping agents,hydrated lime and AR-68,which can im-prove asphalt pavement performance comprehensively.The test shows that adding anti-stripping agent can significantly improve the adhesion between asphalt and aggregate,and improve the asphalt mix-ture composition structure.The anti-stripping agent can evidently raise both water stability and high temperature stability of asphalt mixture.%提出通过外加消石灰和 AR-68两种抗剥落剂来改善沥青相关性质,以及沥青和集料之间的粘附性,从而综合提高沥青路面的路用性能。试验表明,外加抗剥落剂能显著提高沥青与集料之间的粘附性,改善沥青混合料的组成结构,并且沥青混合料的水稳定性、高温稳定性均有明显提升。

  14. Physical properties of asphalt rubber after being mixed with reclaimed asphalt mixes

    OpenAIRE

    Pais, Jorge C.; Pereira, Paulo A. A.; Junior, J.; Gardete, Dinis

    2008-01-01

    Recycling of road pavements became an effective technique after the European legislation defined the amount of reclaimed material that could be sent to landfills. This rehabilitation technique allows the re-use of old pavement material and favours the reduction of the amount of new materials used to produce new pavement layers. One of the most promising pavement rehabilitation techniques uses asphalt rubber mixtures, i.e. asphalt mixtures in which the binder is asphalt modified by crumb r...

  15. Study and Application of Asphalt Medium Method for Measuring Pavement Air Void%沥青介质法实测路面空隙率研究及应用

    Institute of Scientific and Technical Information of China (English)

    周卫峰; 李源渊; 陈华鑫

    2016-01-01

    In order to overcome the disadvantages of poor representation and the accuracy in current air voids of asphalt pavement testing, we researched and developed the asphalt medium method for direct measuring asphalt pavement core samples’ largest theory relative density and calculating air voids, and applied it for quality inspection and evaluation of practical projects. The research result shows that ( 1 ) Compared with traditional method, the asphalt medium method overcame the drawbacks of solvent method and vacuum method, using heat asphalt as medium, it can more accurately measure the largest theory relative density of asphalt core samples, so the accuracy is higher. ( 2 ) The asphalt medium method directly uses the core samples’ bulk density and largest theory relative density for core samples’ air voids calculation, it has stronger representation. (3) As long as there is core samples from asphalt pavement, the asphalt medium method can be used for measuring its air voids, and it does not need to consult the maximum theoretical density of mixture for construction, so the application is more convenient. The variability of the measured largest theory relative density of core samples using the asphalt medium method can accurately evaluate the variability of the asphalt pavement. (4) There is a good relationship between the measured pavement air voids and the water seepage coefficient measured by the asphalt medium method. In practical projects, the method can be easily used for measuring the air voids of asphalt core samples, the result can be used for pavement quality evaluation and quality control.%为克服目前沥青路面空隙率检测代表性及准确性差的缺点,研究开发直接实测沥青路面芯样最大理论相对密度及计算空隙率的沥青介质法,并应用于实际工程的质量检测与评定。研究结果表明,与传统方法相比,沥青介质法克服了溶剂法与真空法的缺点,以热沥青为介质,更

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

    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。

  17. Riding Quality Model for Asphalt Pavement Monitoring Using Phase Array Type L-band Synthetic Aperture Radar (PALSAR)

    OpenAIRE

    Kamiya Yoshikazu; Weerakaset Suanpaga

    2010-01-01

    There are difficulties associated with near-real time or frequent pavement monitoring, because it is time consuming and costly. This study aimed to develop a binary logit model for the evaluation of highway riding quality, which could be used to monitor pavement conditions. The model was applied to investigate the influence of backscattering values of Phase Array type L-band Synthetic Aperture Radar (PALSAR). Training data obtained during 3–7 May 2007 was used in the development process, toge...

  18. 水泥路面板再生集料基层沥青路面性能预测%Performance Prediction of Recycled Cement Aggregates to Asphalt Pavement Roadbase

    Institute of Scientific and Technical Information of China (English)

    金荣

    2012-01-01

    通过室内试验分析了旧水泥路面板再生集料的技术指标,获取再生集料半刚性基层相关性能.研究结果表明旧水泥路面板再生集料具有良好的路用性能.在此基础上,笔者运用路面设计软件AASHTO 2002 M-E PDG对再生集料半刚性基层沥青路面进行性能预测,讨论新建沥青路面结构组合的可行性,从而为实际工程应用提供理论依据.%The related property of semi-rigid base constructed by recycled aggregates is obtainable through the analysis of the technical indicators on recycled aggregates of the old cement concrete pavement by experiment. The result indicates that the recycled aggregates of old cement concrete pavement remains excellent road performance. And on that basis, with the pavement design software AASHTO 2002 M-E PDG the performance of seme-rigid base asphalt pavement using the material of recycled aggregates is predicted. Moreover, the feasibility of structural composition of new asphalt pavement with an old one has also been discussed which could offer the theory support for the practical engineering application.

  19. Research on Fatigue Properties of Asphalt Pavement on Mix Base%混合式基层沥青路面的疲劳特性分析研究

    Institute of Scientific and Technical Information of China (English)

    彭宏图

    2013-01-01

    According to the 06 standard design methods,AASHTO experiment methods and actual interlayer bonding state,the fatigue properties of three different bituminous pavements of composite base are analyzed in this paper.The results reveal that with the same thickness,the mixed asphalt pavement has a better fatigue life than the semi-rigid base AC pavement.For the purpose of analyzing the sensitivity of the fatigue property,the thickness of the pavement and modulus of graded gravel are also taken into account in three different asphalt pavements of composite.%采用了06版规范方法、考虑实际层间粘接状态的规范方法以及AASH00经验方法对3种类型的混合式基层沥青路面的疲劳特性进行了分析研究,得出了相同厚度的混合式基层沥青路面比半刚性基层沥青路面具有更长的疲劳寿命的结论.并对不同结构层厚度、级配碎石模量对3种类型的混合式基层沥青路面的疲劳特性的敏感性进行了分析.

  20. Finite Element Model for Rutting Prediction in Asphalt Mixes in Various Air Void Contents

    OpenAIRE

    Mohammed Hadi Nahi; Ibrahim Kamaruddin; Amiruddin Ismail; Ramez Al-Ezzi Al-Mansob

    2014-01-01

    Asphalt pavement rutting is one of the most commonly observed pavement distresses and is a major safety concern to transportation agencies. Millions of dollars are spent annually to repair rutted asphalt pavements. Researches into improvements of hot-mix asphalt materials mix designs, methods of pavement evaluation and design can provide extended pavement life and significant cost savings in pavement maintenance and rehabilitation. The three objectives of this study are to investigate the rut...

  1. How to Do Well the Management and Quality Control of Asphalt Pavement Construction%浅谈如何做好沥青路面施工管理与质量控制

    Institute of Scientific and Technical Information of China (English)

    朱成兵

    2013-01-01

    In highway and urban road construction, technology management of asphalt pavement construction is very important. For asphalt pavement construction management, quality control is the problem need to address for construction technology managers. This article discussed this problem for informational purposes only.%  在公路与市政道路建设施工中,进行沥青路面的施工技术管理是非常重要的工作。如何进行沥青路面施工管理,做好质量控制工作一直是施工技术管理人员需要解决的问题,本文就以上问题进行了探讨,仅供参考。

  2. 沥青混凝土道面反射裂缝的防治与预控%On prevention and pre-control of reflection cracks of asphalt concrete pavement

    Institute of Scientific and Technical Information of China (English)

    江红义

    2012-01-01

    Combining with the work practice, the paper analyzes the formation mechanism and reasons for the reflection cracks on the asphalt concrete pavement, points out the pre-control measures and treatment methods for the reflection cracks, and proves by the engineering example that the application of the prevention technique can reduce the reflection cracks and enhance the stability of the asphalt concrete pavement.%结合工作实践,分析了沥青混凝土道面反射裂缝的产生机理及产生原因,提出了反射裂缝的预控措施和治理方法,通过工程实例证明该防治技术的应用减少了反射裂缝,增强了沥青混凝土面层的稳定性。

  3. The Grey-System-Based Prediction of the Service Performance of Asphalt Pavement of Expressways%基于灰色系统的高速公路沥青路面综合使用性能预测

    Institute of Scientific and Technical Information of China (English)

    范喜安

    2012-01-01

    以京沪高速公路(河北段)沥青路面使用性能评价为例进行研究。分析了影响沥青路面使用性能的主要因素。选取了2007-2011年路面使用性能各项指标数据和交通量,建立了GM(1,N)模型,预测了京沪高速公路(河北段)2012~2016年沥青路面使用性能各分项指标,误差检验表明,预测精度较高。通过预防性养护前沥青路面单项指标衰变曲线分析,得到了沥青路面综合使用性能指标,为确定预防性养护时机提供了依据。%With the performance-evaluation of the asphalt pavement of the Hebei Section of the Beiiing-Shanghai Expressway as a practical example, the main factors affecting the performance of asphalt pavement are analyzed ia the paper. With the various service performance targets and the traffic volume of the pavement built during 2007-2011 chosen, a GM (1, N) model is estab- lished to forecast all the classified targets of the service performance of the asphalt pavement of the Hebei Section of the Beijing- Shanghai Expressway. The error tests show that the accuracy of the forecast is quite high. Through the analysis of the decay curve of a single target of the asphalt pavement prior to the preventive curing, the comprehensive service performance targets of the asphalt pavement are obtained. The paper provides the basis, upon which the right time forthe preventive curing may be determined.

  4. Weight Research on Pavement Performances of Asphalt Mixture Based on Comparative Matrix Method%基于比较矩阵法的沥青混合料路用性能权重研究

    Institute of Scientific and Technical Information of China (English)

    和世明

    2012-01-01

    在评价沥青混合料的路用性能这一矛盾体时,权重是一关键因素,对方案优选起重要作用。如何相对客观地确定权重是评价模型中一个非常关键的问题。通过沥青混合料各路用性能的预估寿命这一相对客观的指标,结合比较矩阵法建立了权重模型,分别求取了沥青各面层各路用性能的权重。通过分析各路用性能的权重,可进一步指导各面层的沥青混合料的设计。%In case of assessment of the contradictory pavement performances of asphalt mixture,weight is the key factor playing important role in optimization of programme.How to confirm the weight objectively is very important for assessment model.By means of a comparative objective index,the estimated life of pavement performances of asphalt mixture and in combination with comparative matrix,the weight model is established to seek the weight of pavement performances of various asphalt layers.Through the analysis of pavement performances'weight,the design of asphalt mixture for various layers can be further guided.

  5. Study on Asphalt Pavement Fatigue-Damage with Forecasting Axial Load Spectrum%按预测轴载谱分析沥青路面的疲劳损伤

    Institute of Scientific and Technical Information of China (English)

    马林; 葛折圣; 胡晓倩; 黄明波

    2011-01-01

    现行《公路沥青路面设计规范》(JTGG D50-2006)轴载等效换算方法难以反映超载、重载交通对路面结构的影响.结构层参数取值未考虑结构层在疲劳过程中的材料损伤,是重载交通沥青路面出现早期破坏的原因之一.采用预测轴载谱和Miner法则,计算分析了路面结构的疲劳损伤累积过程,并考虑不同使用阶段路面基层模量衰减对路面结构损伤进程的影响.结果表明,半刚性基层厚沥青面层路面结构的疲劳损伤累积进程明显优于目前国内较典型的半刚性基层沥青路面结构.研究结果为重载交通沥青路面结构设计指明了方向.%In Specifications for Design of Highway Asphalt Pavement (JTG D50-2006), the method of Equivalent Axle Loads could not reflect the influence on pavement structure by overload and heavy-load transportation. And the parameter of structural layers was no considering the material damage in the process of fatigue. It is one of the reasons why asphalt pavement is damaged early. The fatigue-damage accumulation in pavement structure was analyzed by using the forecasting axle load spectrum and Miner law. And the parameter of structural layers attenuated while the material damage in the process of fatigue. The results show that the fatigue damage accumulation process of semi-rigid base total thickness asphalt pavement structure is significantly better than the current domestic typical semi-rigid bituminous pavement structure. So this research results can help the development of structure design of heave-load asphalt pavement.

  6. Water stability analysis of different grade rubber asphalt pavements%不同等级路面下橡胶沥青混合料水稳定性研究

    Institute of Scientific and Technical Information of China (English)

    2016-01-01

    In order to investigate the water stability of asphalt mixture under different levels of pavement,the AC-13 continuous graded asphalt concrete is replaced by the rubber particles.The stability of water in the first stage and the low grade pavement was studied by means of freezing and thawing split test.It is concluded that the suitable rub-ber particles can effectively reduce the splitting strength of asphalt mixture after freez-ing and thawing cycles.The void fraction of rubber asphalt mixture is higher than that of common asphalt mixture,and the splitting tensile strength is slightly less than that of the common asphalt mixture.The anti water performance of rubber asphalt mixture can meet the technical requirements of the first grade pavement engineering,and the in-crease of fine aggregate can improve the anti water performance of low grade pavement.%为探讨不同等级路面条件下橡胶沥青混合料的水稳定性能,以橡胶颗粒等质量取代AC-13连续级配沥青混凝土内的部分集料,通过冻融劈裂试验,对其在不同等级路面的水稳定性进行了研究.研究结果表明:掺入适宜的橡胶颗粒能有效减缓沥青混合料冻融循环后的劈裂强度损害.橡胶沥青混合料的空隙率大于普通沥青混合料的,其劈裂抗拉强度略小于普通沥青混合料的,且橡胶颗粒的粒径和掺量对其影响也非常明显.橡胶沥青混合料的抗水性能满足一级路面工程的技术要求.而低等级路面中,增加细集料能够改善其抗水性能.

  7. Assessment of bond between asphalt layers

    OpenAIRE

    Muslich, Sutanto

    2010-01-01

    Asphalt pavements are usually constructed in several layers and most of pavement design and evaluation techniques assume that adjacent asphalt layers are fully bonded together and no displacement is developed between them. However, full bonding is not always achieved and a number of pavement failures have been linked to poor bond condition Theoretical research showed that the distribution of stresses, strains and deflections within the pavement structure is highly influenced by the bond c...

  8. The application of pouring asphalt steel deck pavement construction method in suspension bridge%浇筑式沥青钢桥面铺装工法在悬索桥中的应用

    Institute of Scientific and Technical Information of China (English)

    李逢源

    2014-01-01

    This paper compared and analyzed the thermoset materials,asphalt materials,composite materials three kinds of steel deck pavement schemes,combining with the pavement case of Nanjing Yangtze River four bridge,mainly discussed the pavement method of composite pouring asphalt steel deck,the practice proved that the method ensured the back resistance and fatigue resistance of pavement structure,not only im-proved the construction quality,also shorten the construction period.%对热固性材料、沥青类材料、组合类材料三类钢桥面铺装方案进行了对比分析,结合南京长江四桥的铺装案例,主要对复合浇筑式沥青钢桥面的铺装工法进行了论述,实践证明该工法确保了铺装结构的追随性与抗疲劳性,既提高了施工质量,又缩短了工期。

  9. Evaluating permanent deformation in asphalt rubber mixtures

    OpenAIRE

    Fontes, Liseane P. T. L.; Trichês, Glicério; Pais, Jorge C.; Pereira, Paulo A. A.

    2009-01-01

    Permanent deformation or rutting, one of the most important distresses inflexible pavements, has long been a problem in asphalt mixtures. Throughout the years, researchers have used different test methods lo estimate the performance of asphalt mixtures in relation to rutting. One of the alternatives to reduce permanent deformation in asphalt pavement layers is through the use of mixtures produced with asphalt rubber This work aims at comparing the performance of a conventional dense graded mi...

  10. 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

  11. 基于非线性疲劳损伤特性的沥青路面形变规律%Deformation Regularity of Asphalt Pavement Based on Nonlinear Fatigue Damage Characteristics

    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 characteristic and deformation regularity of asphalt pavement under vehicle load, by using the general finite element software ABAQUS and the secondary development platform, an asphalt pavement numerical model which considers pavement material nonlinear fatigue damage was established to analyze the spatial distribution/evolution of asphalt pavement structure damages, the spatial distribution/evolution of asphalt pavement structure horizontal normal strains, and the evolution of pavement surface deflection varying with loads under repeated vehicle load. The results show that (1) The pavement structural damage mainly distributes in a specific damage zone located at the bottom of the layer along the middle line between the double wheels. With the increasing of load cycles, the damage degrees at the bottom of the base layer and the sub-base layer increase, and the rate of which gradually increases. (2) The horizontal tensile strain close to the bottom of the pavement layer increases, the rate of which gradually increases, and neutral axis moves upward. (3) The deflection of pavement surface increases with the increase of load cycles, and the rate of which increases gradually. The regularity is in agreement with related measured results. The results can provide a theoretical support for asphalt pavement structure design, maintenance and prediction of the long-term performance.%为了研究沥青路面结构在车辆荷载作用下的疲劳损伤演化特性,并分析其形变规律,运用通用有限元软件ABAQUS及其二次开发平台,建立考虑路面材料非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和路面结构水平正应变的空间分布及演化规律,以及路表弯沉随荷载作用的演变规律.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,基层层底与底基层层底损伤度随荷载

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

    OpenAIRE

    Pérez, F; Rodriguez, M.; De 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...

  13. Analysis of asphalt pavements with flexible base using viscoelastic three-dimensional finite element method%柔性基层沥青路面结构粘弹性三维有限元分析

    Institute of Scientific and Technical Information of China (English)

    陈诚诚; 刘俊卿; 王保实; 李倩

    2015-01-01

    以沈大高速公路沈鞍段路面结构为例,在温度变化时考虑沥青混合料粘弹性影响,建立了柔性基层沥青路面温度场疲劳断裂模型,借用三维有限元实现交通荷载及温度荷载耦合作用下路面结构的动力特性. 研究多场耦合作用下柔性基层沥青路面结构的破坏行为. 研究表明:荷载在移动过程中剪切型应力强度因子对路面开裂起控制作用;降温时张开型应力强度因子是沥青路面开裂破坏的主要因素;对柔性基层沥青路面结构考虑变温和交通荷载耦合作用下的疲劳寿命预估,结果显示,该方法与实际更为接近.%Taking the pavement structure of Shen-An period in Shen-Da highway as the example and considering the asphalt mixture viscoelasticity when temperature changed, the fatigue fracture model of flexible base asphalt pavement in temperature field was established. Then using the three dimensional finite element technology, the dynamic properties of the pavement structure under the coupling action of the traffic and temperature load were achieved and the destructive action of flexible base asphalt pavement was also analyzed under the action of multiple field coupling. The study showed that in the process of pavement cracking, the shear stress intensity factor played a control role as the load moved and the opening mode stress intensity factor was the critical role as the temperature felled. Predicting the fatigue life of flexible base asphalt pavement by considering the coupling action of the traffic and temperature load,the result showed this method was almost completely approaching the reality.

  14. Study on Pavement Performance of Rubber Asphalt Prepared with Diesel Activated Rubber Powder%柴油活化橡胶粉制备橡胶沥青路用性能研究

    Institute of Scientific and Technical Information of China (English)

    何东坡; 王浩

    2013-01-01

    In order to improve modification effect of rubber powder on asphalt and reduce its influence on original asphalt component, diesel is used as addition agent to activate rubber powder and then the pavement performance of diesel activated rubber asphalt is studied and compared to that of ordinary rubber asphalt. Then the mass ratio of rubber powder to diesel is confirmed to be 2: 1 and the base asphalt is Daqing AH-#90. The result shows that the law on how the diameter and content of the powder affecting the performance of activated rubber asphalt is the same as that on ordinary rubber asphalt; both the high-temperature behavior and elastic recovery performance of diesel activated rubber asphalt is inferior to those of ordinary one but both the low-temperature behavior and construction performance is superior.%为提高橡胶粉对沥青的改性效果,减少橡胶粉对原状沥青组分的影响,采用助剂柴油活化处理橡胶粉,研究了柴油活化橡胶沥青的路用性能,并与普通橡胶沥青的相关性能进行对比.确定了橡胶粉与柴油的质量比为2:1,基质沥青为黑龙江大庆AH-#90.结果表明:胶粉粒径、胶粉掺量对活化橡胶沥青性能的影响规律与普通橡胶沥青一样,柴油活化橡胶沥青的高温性能和弹性恢复性能不如普通橡胶沥青,低温性能和施工性能好于普通橡胶沥青.

  15. Riding Quality Model for Asphalt Pavement Monitoring Using Phase Array Type L-band Synthetic Aperture Radar (PALSAR

    Directory of Open Access Journals (Sweden)

    Kamiya Yoshikazu

    2010-11-01

    Full Text Available There are difficulties associated with near-real time or frequent pavement monitoring, because it is time consuming and costly. This study aimed to develop a binary logit model for the evaluation of highway riding quality, which could be used to monitor pavement conditions. The model was applied to investigate the influence of backscattering values of Phase Array type L-band Synthetic Aperture Radar (PALSAR. Training data obtained during 3–7 May 2007 was used in the development process, together with actual international roughness index (IRI values collected along a highway in Ayutthaya province, Thailand. The analysis showed that an increase in the backscattering value in the HH or the VV polarization indicated the poor condition of the pavement surface and, of the two, the HH polarization is more suitable for developing riding quality evaluation. The model developed was applied to analyze highway number 3467, to demonstrate its capability. It was found that the assessment accuracy of the prediction of the highway level of service was 97.00%. This is a preliminary study of the proposed technique and more intensive investigation must be carried out using ALOS/PALSAR images in various seasons.

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

    OpenAIRE

    Augusto Cannone Falchetto; Ki Hoon Moon; Michael P. Wistuba

    2014-01-01

    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 eff...

  17. A review of asphalt and asphalt mixture aging

    OpenAIRE

    Wilmar Darío Fernández-Gómez; Hugo Alexander Rondón Quintana; Fredy Reyes-Lizcano

    2012-01-01

    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-ter...

  18. 考虑轮迹横向分布的沥青路面疲劳寿命修正系数%Correcting factor of asphalt pavement fatigue life considering wheel-path lateral distribution

    Institute of Scientific and Technical Information of China (English)

    董忠红; 吕彭民

    2011-01-01

    To study the influence of the wheel-path lateral distribution on the fatigue life of the asphalt pavement,some dynamic strain sensors were buried at the bottom of the AC layer during construction,and the lateral distribution of the dynamic response of the semi-rigid base asphalt pavement was studied.Comprehensively considering the influences of the wheel-path lateral distribution and the dynamic response lateral distribution,the correcting factor of fatigue life of the asphalt pavement was got.The results show that the lateral distribution of the maximum longitudinal tensile strain at the bottom of the asphalt layer shows M shape under moving wheel load,and only the destruction of the position which located within 40 cm away from the center of the double tire is need to be considered when the fatigue life of the asphalt pavement is evaluated.The lateral distribution of the lateral strain at the bottom of the asphalt layer is quite complex,and only the destruction of the position which located under the double tires is need to be considered when the fatigue life of the asphalt pavement is evaluated.The fatigue life correcting factor of the test road is 0.16,which can be referred to the semi-rigid asphalt pavement design and fatigue life evaluation.%为了研究轮迹横向分布对沥青路面结构使用寿命的影响,道路施工过程中,在沥青面层底部布置动应变传感器,研究移动荷载下半刚性基层沥青路面动力响应横向分布规律。综合考虑轮迹横向分布和路面结构动力响应横向分布,计算得到沥青路面疲劳寿命修正系数。研究结果表明:移动车轮荷载下,沥青面层底部最大纵向拉应变的横向分布呈"M"形,进行沥青路面疲劳寿命评估时,只需要考虑距双排轮胎中心40cm之内位置产生的破坏作用;沥青面层底部横向弯拉应变的横向分布比较复杂,进行疲劳寿命评估时,只需要考虑轮胎下部产生的破坏作用。试验路的

  19. 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.

  20. Research on Effect of Recycled Materials on Properties of Cementing Material of Aging Asphalt Pavement%再生材料对旧沥青路面胶结料的再生性能影响研究∗

    Institute of Scientific and Technical Information of China (English)

    吴正光; 陈娟; 康爱红; 黄铭

    2015-01-01

    To analyze effect of different materials on properties of aging asphalt, different aging degree of reclaimed asphalt pavements were chosen to obtain the aging asphalt, new asphalt material and two kinds of viscosity grade of regenerant was added to aging asphalt to make recycled asphalt, based on the analysis of change rule of viscosity and penetration index on recycled asphalt, to compare the effect of different regeneration methods. The results show that new asphalt materials can ’ t improve recycled performance of aging asphalt well, regeneration agent on the improvement of the old asphalt performance is far superior to the new asphalt; low viscosity of regenerant can better restore penetration index of old asphalt, but for the low aging of old asphalt, it would make viscosity index falling too fast not to guarantee the high temperature performance of recycled asphalt. It suggests that old asphalt of lighter aging level uses high viscosity grade of recycling agent, old asphalt of heavier aging level uses regeneration of lower viscosity level and the new asphalt.%为分析不同再生材料对旧沥青路面胶结料再生性能的影响,基于实际工程抽提回收得到不同老化程度的旧沥青路面胶结料,应用新沥青材料与两种黏度等级的再生剂调配旧沥青路面胶结料制备成再生沥青,分析再生沥青的黏度与针入度指标的变化规律,并对不同再生方法的再生效果进行了比较。试验结果表明:新沥青材料对旧沥青路面胶结料的再生能力有限,再生剂对旧沥青路面胶结料性能指标的改善远优于新沥青;低黏度的再生剂能较好地恢复旧沥青路面胶结料的针入度指标,但对于老化程度较低的旧沥青路面胶结料,会使其黏度指标下降过快,而不能保证再生沥青的高温性能;建议老化等级较低的旧沥青路面胶结料采用黏度等级较高的再生剂再生的方法,老化等级较重的旧沥青

  1. Application of Rubber Asphalt Concrete Pavement in Port Area Roads%橡胶沥青混凝土路面在港区道路中的应用

    Institute of Scientific and Technical Information of China (English)

    莫晓华

    2015-01-01

    In allusion to heavy load traffic feature of port roads,this paper carries out indoor uniaxial compression test,wheel rutting test and bending test of small beams for rubber asphalt mixture.The results show that the elastic modulus and high -temperature property of rubber asphalt mixture are equivalent to SBS modified asphalt mixture,but fatigue performance is the best and above 1 time higher than matrix asphalt mixture.The paper applies rubber asphalt mixture to test sections,and the results show that the surface water seepage coefficient,compactness of mixture,structure depth and surface resistant coefficient of rubber asphalt pavement can satisfy the basic requirements of the specifications.On the basis of test, the paper proposes pavement structural form 4cm rubber asphalt AC -13 +6cm matrix asphalt AC -20 applicable to port roads.%针对港区道路的重载交通特性,进行橡胶沥青混合料室内单轴压缩试验、车辙试验及小梁弯曲试验。结果表明:橡胶沥青混合料的回弹模量、高温性能与 SBS 改性沥青混合料相当,但其疲劳性能最好,比基质沥青混合料高1倍多。将橡胶沥青混合料用于试验路段,结果表明:橡胶沥青路面的路表渗水系数、混合料压实度、构造深度以及表面抗滑系数都能够满足规范基本要求。基于试验,提出港区道路适用的路面结构形式为4 cm 橡胶沥青 AC -13+6 cm 基质沥青 AC -20。

  2. A LABORATORY STUDY ON THE EFFECT OF HIGH RAP AND HIGH ASPHALT BINDER CONTENT ON THE PERFORMANCE OF ASPHALT CONCRETE

    OpenAIRE

    Boriack, Paul Christian

    2014-01-01

    This thesis investigates the effect of added asphalt binder content on the performance and volumetric properties of asphalt concrete mixes containing Reclaimed Asphalt Pavement (RAP). Mixes with three different percentages of RAP (0%, 20%, 40%) obtained from an asphalt producer and three different percentages of asphalt binder (design asphalt content, design +0.5%, and design +1.0%) were evaluated. Additionally, a laboratory produced mix containing 100% RAP with four asphalt binder contents...

  3. 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.

  4. 考虑半刚性结构层横向贯通裂缝的沥青路面疲劳特性分析%Asphalt Pavement Fatigue Characteristic Analysis Considering the Semi-rigid Layer of Transverse Crack

    Institute of Scientific and Technical Information of China (English)

    刘浩; 黄开宇; 邓蓉

    2012-01-01

    In this paper finite element analysis method ( FEM) has been used to calculate and analyze asphalt pavement deflection,the maximum tensile stress and shear stress of asphalt layer,the maximum tensile stress and calculation fatigue life of semi-rigid layer in no transverse cracks and lateral cracks in two working conditions. The results show that the internal stress increases and the calculation fatigue life will be greatly reduced. In highway asphalt pavement structure design should consider structural analysis when road in crack condition.%采用有限元计算分析在无横向裂缝和有横向贯通裂缝两种工况条件下沥青路面的弯沉、沥青层最大拉应力和最大剪应力、半刚性层最大拉应力以及计算疲劳寿命,分析结果表明,考虑半刚性层存在横向贯通裂缝时,内部应力增加且计算疲劳寿命将大为降低.在提出高速公路沥青路面结构必要时应考虑存在裂缝的工况下进行验算.

  5. 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…

  6. POROUS PAVEMENT. PHASE I. DESIGN AND OPERATIONAL CRITERIA

    Science.gov (United States)

    Design and operational criteria, utilization concepts, benefits and disadvantages, as well as other characteristics of porous pavements are presented in this report. Particular emphasis is placed on porous asphalt pavements, but the criteria and design approach are applicable to ...

  7. 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.

  8. Comparative Durability Analysis of Asphalt Concrete Pavement Reinforced with Two Geosynthetics%两种土工合成材料加筋沥青混凝土路面耐久性对比分析

    Institute of Scientific and Technical Information of China (English)

    何勇海

    2012-01-01

    土工合成材料加筋沥青混凝土路面结构可以提高其疲劳寿命、抗反射裂缝和抗高温车辙能力,成为沥青路面路用技术性能改善的一个有效途径.通过室内试验系统研究了无加筋层、中间加铺玻纤土工格栅或聚酯玻纤布加筋沥青混凝土的低温抗裂性、高温稳定性和抗疲劳性能.试验结果表明,聚酯玻纤布加筋结构具有较好的低温抗裂性能,而玻纤格栅加筋结构的高温稳定性较好.%The asphalt concrete pavement structure reinforced with synthetics can improve the fatigue life, reflective crack resistance and high temperature rut resisting ability. This technique has become an effective way for improvements of road performance of the asphalt pavement. The laboratory test of low temperature resistance, the high temperature stability and anti-fatigue performance are done with the ordinary asphalt concrete pavement structure, reinforced with glass fiber geogrid or polyester glass fiber cloth glass. The test results show that polyester glass fiber cloth reinforcing structure has good low temperature crack resistance energy, while glass fiber reinforcement grid structure has good high temperature stability.

  9. Study on Axle Load Conversion for Concrete Base of Durable Asphalt Pavement%耐久性沥青路面混凝土基层轴载换算研究

    Institute of Scientific and Technical Information of China (English)

    郑木莲; 陈拴发; 马庆雷

    2012-01-01

    刚性基层耐久性沥青路面作为一种新型的路面结构,现行规范对于上覆沥青层水泥混凝土路面的设计思路对其并不适用,其轴载换算公式由于没有考虑刚性基层沥青路面结构的特点,得出的结果存在较大误差.依据普通混凝土及贫混凝土的疲劳方程,结合耐久性沥青路面混凝土基层在标准轴载和不同轴-轮型荷载作用下回归得出的荷载应力计算公式,按照混凝土基层等效疲劳损伤原则,推求得出单轴-单轮、单轴-双轮组、双轴-双轮组荷载换算为标准轴载的公式.结果表明:得出的轴载换算公式可充分考虑混凝土基层耐久性沥青路面基层厚度、基层模量、地基模量结构设计参数的影响,具有良好的实用性,可为路面结构设计提供依据.%As a new kind pavement structure, the design method of cement concrete pavement with asphalt surface course in the current specification is not suitable to the durable asphalt pavement with rigid base. Since the characteristics of durable pavement with rigid base are not taken into account, there exists large error in the results getting from the axle-load conversion equation. According to the fatigue equations of popular concrete and lean concrete, the load stress calculation equations rigid base in durable asphalt pavement subjecting standard axle load and different axle-wheel load, and the equivalent fatigue damage principle of concrete base, the axle load conversion equations from the load of single-axle and single-wheel, single-axle and two-wheel and two-axle and two-wheel to the standard axle load are derived. The results show that the axle load conversion equations got in the paper can fully consider the influences of the structure design parameters of base depth, base modulus and subgrade modulus etc. Of durable asphalt pavement with concrete pavement, so the equations have good suitability and can provide basis for pavement structure design.

  10. Pavement Performance of Warm Recycled Asphalt Mixture%温拌再生沥青混合料路用性能研究

    Institute of Scientific and Technical Information of China (English)

    冯万斌; 周谦

    2012-01-01

    To apply Warm Recycled Asphalt Mixture (WRAM) widely in Liaoning, the pavement performance of WRAM with different dosage of RAP is studied based on warm mix agent produced from Liaoning. The effect of compaction temperature on volume of voids of WRAM is analyzed, and the manufacture temperatures of WRAM specimens in laboratory are confirmed, the gradation compositions of WRAM are verified by the experiments used currently. The results show the mix temperature and compaction temperature of asphalt mixtures through central plant hot recycling can be reduced evidently and the utilization ratio of RAP may be increased as a result of the addition of warm mix agent. Moreover, the high temperature stability, low temperature performance and water stability of WRAM preferably fulfill technology requirements of criterion implemented currently depending on the rational controlling of volume of voids of WRAM.%为使温拌再生沥青混合料(WRAM)在辽宁省更好推广应用,基于辽宁自主研发的温拌剂进行了不同回收沥青路面材料(RAP)掺量的WRAM路用性能研究。分析了不同压实温度对WRAM空隙率的影响规律,据此确定了WRAM的室内制备温度,并采用现行试验方法检验了WRAM的配合比设计。结果表明,温拌剂的加入可显著降低厂拌热再生沥青混合料的拌和与压实温度,提高RAP的利用比例,通过对WRAM空隙率指标的合理控制,WRAM的高低温性能和水稳定性能均表现良好,满足现行规范技术要求。

  11. 结构参数对沥青路面结构设计的影响分析%The Analysis of Structural Parameters' Influence on the Structural Design of Asphalt Pavement

    Institute of Scientific and Technical Information of China (English)

    谢娟; 李文瑛

    2011-01-01

    The present paper applies the theory and method proposed by the current design standards to the calculation of the thickness of asphalt pavement structure to analyze the variable relationship between thickness of pavement structure and design deflection as well as modulus of subgrade, and the impact of modulus of subgrade and thickness of semi-rigid base on the subbase tensile stress of every layer and, by an example calculation, draws a natural conclusion that if the structural thickness is designed according to the subbase tensile stress, fatigue cracking can be reduced with the decrease of subbase tensile stress, which is achieved by the improvement of the modulus of subgrade and the increase in the thickness of semi-rigid layer. In this paper, a large number of calculation data are accumulated during the analysis and provide reference for the designer' s further understanding of asphalt pavement structural design theory, which enable them to make better design of pavement structure.%应用现行设计规范提出的公路沥青路面结构厚度计算理论和方法,通过实例计算,分析了路面结构厚度随设计弯沉、土基模量的变化关系,分析了土基模量、半刚性基层厚度对路面各结构层层底拉应力的影响,得出通常情况下会以底基层层底拉应力控制结构厚度设计,以及提高土基模量、增加半刚性层厚度可以减小(底)基层层底拉应力从而减少疲劳开裂的结论.

  12. 加筋沥青路面APA试验及其非线性疲劳损伤分析%APA TEST AND NONLINEAR FATIGUE DAMAGE ANALYSIS OF THE REINFORCED ASPHALT PAVEMENT

    Institute of Scientific and Technical Information of China (English)

    周志刚; 袁秀湘

    2012-01-01

    Wheel repeated loading test is carried out to the asphalt pavement specimen under several loading levels by using Asphalt Pavement Analyzer (APA) to compare the reinforcing effect of fabric and glassgrid on the fatigue characteristics of asphalt pavement. Based on this, one nonlinear fatigue damage model is suggested. By using fatigue damage mechanics-finite element method, the paper simulated numerically the total process of the APA test, and analyzed the stress, displacement and fatigue life of specimens. The comparison between the results of simulation and test proves the rationality of the suggested model. It is pointed out that using reinforcing material can remarkaeblely improve the stress and dispacement levels in pavement after the crack spreads across the reinforcement, and so to increase the pavement's fatigue life effectively due to the bridge effect of reinforcing materials. Besides, based on the fatigue analysis, it is proved further that Paris equation can be used to describe the spreading process of the fatigue crack in pavement, and related parameters can be obtained accordingly.%应用沥青路面分析仪(APA)对沥青路面结构模拟试件进行多种荷载下的往返轮载疲劳试验,对比研究土工布、玻璃纤维格栅对沥青路面疲劳性能的加筋效果。在此基础上,提出沥青混合料非线性疲劳损伤演化模型,应用基于疲劳损伤力学的非线性有限元方法模拟APA试验过程,分析了试件应力、变形、疲劳寿命等,并与试验结果对比,论证了所提疲劳损伤演化模型的合理性,指出因加筋材料的桥联效应显著地改善了裂缝穿过筋材后路面的受力变形状况,有效地延长路面的疲劳寿命。同时,基于疲劳损伤分析,进一步验证了Paris公式可用于描述路面结构的疲劳裂缝稳定发展过程,并获得了有关的参数。

  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. PMID:24316812

  14. Permeable Pavements at Purdue

    OpenAIRE

    Knapp, Jim

    2013-01-01

    Two case studies will be presented describing sustainable drainage alternatives. The processes used for the 2nd Street project in Seymour will provide a comparison of the design processes for conventional and green infrastructure solutions. Purdue University will discuss a number of permeable pavement installations on campus and provide a map for viewing. Asphalt, concrete, and permeable paver options will be discussed.

  15. Modified Asphalt Binder with Natural Zeolite for Warm Mix Asphalt

    Science.gov (United States)

    Dubravský, Marián; Mandula, Ján

    2015-11-01

    In recent years, warm mix asphalt (WMA) is becoming more and more used in the asphalt industry. WMA provide a whole range of benefits, whether economic, environmental and ecological. Lower energy consumption and less pollution is the most advantages of this asphalt mixture. The paper deals with the addition of natural zeolite into the sub base asphalt layers, which is the essential constituent in the construction of the road. Measurement is focused on basic physic - mechanical properties declared according to the catalog data sheets. The aim of this article is to demonstrate the ability of addition the natural zeolite into the all asphalt layers of asphalt pavement. All asphalt mixtures were compared with reference asphalt mixture, which was prepared in reference temperature.

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

    OpenAIRE

    Jianlong Zheng; Tuo Huang

    2015-01-01

    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 ...

  17. 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...

  18. 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

  19. 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

  20. 基于非线性疲劳损伤的沥青路面轴载换算%AXLE LOAD CONVERSION OF ASPHALT PAVEMENT BASED ON NONLINEAR FATIGUE DAMAGE

    Institute of Scientific and Technical Information of China (English)

    吕松涛

    2012-01-01

    In order to establish the non-linear fatigue damage evolution equation of asphalt mixture and the axial load conversion method of asphalt pavement,the aggregate gradation and optimum asphalt-aggregate ratios are determined by a proportion design of asphalt mixture.Then,the fatigue damage variable is defined by the modulus decay basing on the basic theory of damage mechanics.The fatigue damage equation was deduced.The direct tensile fatigue test results were fitted from using the fatigue damage equation.The regularities of model parameters and damage with a stress ratio are given out.The new axle load conversion method is established for asphalt pavement.The results indicate that the fatigue damage evolution has the apparent non-linear properties of asphalt mixture.The Miner linear fatigue damage theory is not suitable to describe the process of fatigue damage evolution for asphalt pavement.It is not safe to use the axial load conversion method deriving from the Miner equation.The new axial load conversion method basing on the nonlinear fatigue damage evolution can consider the influence of loading history and damage history.%为了建立沥青混合料的非线性疲劳损伤演化方程,同时为完善沥青路面的轴载换算方法,首先进行沥青混合料的配合比设计,确定矿料级配及最佳油石比,然后从损伤力学基本理论出发,定义模量衰减为其疲劳损伤参量,由此推导得到了疲劳损伤方程,并以此方程对小梁直接拉伸疲劳试验结果进行拟合,得到了模型参数和损伤随应力比的变化规律,建立了沥青路面轴载换算新方法。结果表明:沥青混合料的疲劳损伤演化具有明显的非线性,用Miner线性疲劳损伤理论来描述沥青路面疲劳损伤演化过程不合适,由此推导得到的轴载换算方法偏不安全,建立在非线性疲劳损伤演化基础上的轴载换算方法考虑了加载历史和损伤历史的影响。

  1. 温拌橡胶沥青宽路用温度域流变特性%Rheological properties of warm mix asphalt rubber in wide range of pavement temperature

    Institute of Scientific and Technical Information of China (English)

    何亮; 凌天清; 马育; 马涛; 黄晓明

    2015-01-01

    为了研究温拌橡胶沥青的流变特性,制备了符合《公路工程废胎胶粉橡胶沥青》(JT/T 798—2011)技术要求的橡胶沥青,进行了粘温关系试验与基本技术指标试验,从降温效果与技术指标影响两方面确定了 Sasobit 温拌剂的最佳掺量,评价了 Sasobit 温拌橡胶沥青的高温(60、70℃)、中温(25℃)、低温(5℃~-24℃)宽路用温度域的流变特性。分析结果表明:3%的 Sasobit 为温拌橡胶沥青的最佳温拌剂掺量;温拌剂 Sasobit 提高了橡胶沥青的高温稳定性,70℃车辙因子提高了79%,但对橡胶沥青粘韧性没有明显影响;3%掺量的 Sasobit 降低了橡胶沥青的疲劳性能,25℃疲劳因子提高了22%,但是其温拌橡胶沥青疲劳性能依然优于 SBS 改性沥青;在中国沥青路面使用性能气候分区标准的冬温区温度以下,随着温度的降低 Sasobit 温拌橡胶沥青的低温性能逐渐优于 SBS 改性沥青,-24℃的蠕变劲度为 SBS 改性沥青的45%,同时3%的 Sasobit 掺量不会过度影响橡胶沥青的低温性能,-24℃时橡胶沥青蠕变劲度提高了10%。%In order to research the rheological properties of warm mix asphalt rubber,the asphalt rubber meeting the technical requirements in Asphalt Rubber for Highway Engineering (JT/T 798—2011)was prepared.The optimum content of warm mix additive Sasobit was determined from the warm mix effect and the impact of Sasobit on the technical indexes of warm mix asphalt rubber by viscosity-temperature relationship test and basic technical index test.The rheological properties of Sasobit warm mix asphalt rubber were evaluated in the wide range of pavement temperature at high(60,70 ℃),medium(25 ℃)and low(5 ℃--24 ℃)temperatures.Analysis result shows that 3% is the optimum content of Sasobit in warm mix asphalt rubber.Sasobit can improve the high-temperature stability of asphalt rubber

  2. Permeable Pavement Research - Edison, New Jersey

    Science.gov (United States)

    This presentation provides the background and summary of results collected at the permeable pavement parking lot monitored at the EPA facility in Edison, NJ. This parking lot is surfaced with permeable interlocking concrete pavers (PICP), pervious concrete, and porous asphalt. ...

  3. 重载对沥青路面车辙及疲劳寿命的影响%Influence of Heavy Load on Rutting and Fatigue Life of Asphalt Pavement

    Institute of Scientific and Technical Information of China (English)

    从志敏; 邹晓翎; 龚红仁

    2013-01-01

    为分析重载条件下沥青路面易产生车辙及疲劳病害的成因,基于弹性层状体系理论,利用ABAQUS有限元软件,分别通过车辙量和剪应力、基层疲劳模型表征路面车辙和疲劳寿命,研究了超重交通荷载对沥青路面车辙及疲劳寿命的影响.结果表明,当基层模量为0.4 GPa,轴载从100 kN增加到200 kN时,压密变形量增加了29.82%,路面内最大剪应力增加了24.7%,基层疲劳寿命缩减了95.30%;而当基层模量为2.0 GPa时,上述指标分别为27.67%,39.2%,99.26%.由此可知,重载对沥青路面结构破坏影响显著,且随着基层模量的增加,车辙和疲劳病害更加严重.研究结果有助于解释重交通路段沥青路面车辙及疲劳病害的成因.%In order to investigate the cause of the rutting and fatigue life of asphalt pavement under the heavy-load conditions, based on elastic layered system and through the finite computer ABAQUS,the relative amounts of rutting, shear stress, and base course's fatigue model were included to indicate the pavement rutting and fatigue life, respectively. The influence of heavy traffic loads on rutting and fatigue life of asphalt pavement were examined. The results show when the base modulus is 0. 4 GPa, axle load increases from 100 kN to 200 kN, the compression deformation increases about 29.82%, the maximum shear stress of asphalt pavement increases 24. 7%, the fatigue life of base course decreases 95. 30%. However, when the base modulus is 2. 0 GPa, the above indexes were 27. 67%,39. 2%,99. 26%. Thus,the influence of heavy-load on the asphalt pavement structure damage is significant,and with the increase of base course's modulus, the effect is serious. The results help to explain the causes of rutting and fatigue damage under the heavy traffic road.

  4. 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.

  5. Study on the Durability of Steel Deck Pavement Asphalt Mixture Based on Rubber Powder and SBS Compound Modified Technology%基于橡胶粉与 SBS 复合改性技术钢桥面铺筑沥青混合料耐久性试验研究

    Institute of Scientific and Technical Information of China (English)

    魏斌

    2015-01-01

    In order to satisfy the bridge deck pavement of asphalt concrete special performance re-quirements of asphalt binder,Improve the flexibility of bridge deck pavement asphalt concrete,by adding different proportions of rubber powder and SBS modified asphalt and composite mix performance test anal-ysis,discusses the composite rubber powder modified asphalt mixture by Sophie toughened,shear,impact mechanism water stability,and recommended significantly modified asphalt concrete composite best over-all performance rubber particles content.%为了满足桥面铺装沥青混凝土对沥青结合料的特殊性能要求,提高桥面铺装沥青混凝土的柔韧性,通过对不同掺加比例的橡胶粉与 SBS 复合改性沥青及其混合料的性能进行试验分析,探讨了橡胶粉对复合改性沥青混合料的增柔增韧、抗剪、水稳定性的影响机理,并推荐了可以显著复合改性沥青混凝土综合使用性能的最佳橡胶颗粒掺量。

  6. Traffic noise abatement : how different pavements, vehicle speeds and traffic densities affect annoyance levels

    OpenAIRE

    Freitas, Elisabete F.; Mendonça, Catarina; Santos, Jorge A.; Murteira, Carla; Ferreira, João Amaro Oliveira

    2012-01-01

    In this paper, annoyance ratings from traffic noise recorded on cobblestones, dense asphalt, and open asphalt rubber pavements are assessed with regard to car speeds and traffic den- sities. It was found that cobblestones pavements are the most annoying; also while open asphalt rubber pavement imposes less annoyance than dense asphalt it is not significantly different. Higher car speeds always lead to greater annoyance, as does higher traffic densi- ties. LAeq and LAmax correl...

  7. Improving Rutting Resistance of Pavement Structures Using Geosynthetics: An Overview

    Directory of Open Access Journals (Sweden)

    Sina Mirzapour Mounes

    2014-01-01

    Full Text Available A pavement structure consists of several layers for the primary purpose of transmitting and distributing traffic loads to the subgrade. Rutting is one form of pavement distresses that may influence the performance of road pavements. Geosynthetics is one type of synthetic materials utilized for improving the performance of pavements against rutting. Various studies have been conducted on using different geosynthetic materials in pavement structures by different researchers. One of the practices is a reinforcing material in asphalt pavements. This paper intends to present and discuss the discoveries from some of the studies on utilizing geosynthetics in flexible pavements as reinforcement against permanent deformation (rutting.

  8. 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.

  9. 外加材料对乳化沥青冷再生混合料路用性能的影响%Effect of Additives on Pavement Performance of Cold Recycled Asphalt Emulsion Mixture

    Institute of Scientific and Technical Information of China (English)

    杜少文

    2013-01-01

    The effect of three types of additives,including cement(C),hydrated lime(L) and hydrated lime-slag powder(LS) on the pavement performance of cold recycled asphalt emulsion mixture was investigated.Interface microstructure between new-old mastics in cold recycled asphalt emulsion mixture with cement was observed by scan electron microscopy,and then the strength improvement mechanism of cold recycled asphalt emulsion mixture by additives was analyzed.The test results show that the addition of cement can improve the indirect tensile strength,rutting resistance,water resistance and fatigue life of cold recycled asphalt emulsion mixture best,followed by hydrated lime-slag powder,hydrated lime is the last.The stiffness modulus of new mastic formed by hydrate products of cement or hydrated lime-slag powder with asphalt emulsion is similar with that of old mastic(aged asphalt mastic).Hydrate products has the bridge effect between new-old mastics,promoting the loading coordination and increasing the interface adhesive between new-old mastics,thus,the strength and pavement performance of cold recycled asphalt emulsion mixture can be improved.%研究了水泥、消石灰和消石灰矿渣粉3种外加材料对乳化沥青冷再生混合料路用性能的影响.采用扫描电镜观察了掺水泥乳化沥青冷再生混合料中新旧胶浆界面的显微结构,分析了外加材料对乳化沥青冷再生混合料强度的改善机理.结果表明:水泥对乳化沥青冷再生混合料的劈裂强度、高温稳定性、水稳性和疲劳寿命提高作用最大,消石灰矿渣粉次之,而消石灰最小.水泥或消石灰矿渣粉产生的水化产物与乳化沥青相互交织形成新胶浆,新胶浆劲度模量与严重老化的旧(沥青)胶浆劲度模量差别不大,同时水化产物能在新旧胶浆之间起“桥梁”作用,这促进了新旧胶浆之间的受力协调,大大改善了新旧胶浆之间的黏结,从而极大地提高了乳化沥青冷再生混

  10. HMA Pavement Performance and Durability

    OpenAIRE

    del Pilar Vivar, Eliana; Haddock, John E.

    2006-01-01

    It has long been argued that at densities higher than approximately 92 percent (air void contents lower than 8 percent), a hotmix asphalt mixture is impermeable to water. However, as densities become lower (air void contents higher) than this, small decreases in the density can yield exponential increases in permeability. The objectives of this study were to better understand the increases in hot-mix asphalt pavement performance and durability that can be gained by increasing the initial pave...

  11. 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

  12. 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。

  13. Research and Prospect of Application of Recycled Wastes in Pavement of Asphalt Road%回收废料用于沥青道路铺筑的研究与展望

    Institute of Scientific and Technical Information of China (English)

    高惠; 刘念平

    2012-01-01

    道路铺筑和养护要消耗大量的集料和矿粉,回收料的替代使用有助于保护节约天然资源.结合沥青混合料和集料的各种路用指标,对各类可用作沥青道路铺筑的回收废料进行研究,其中包括钢渣、玻璃、塑料、橡胶、水泥、陶瓷等工业、建筑废料以及生活垃圾焚烧灰等.根据回收料的颗粒大小、硬度、粗糙度、孔隙率、弹性等特性,将它们分别用于道路各个层面结构中,其体现出与天然集料和矿粉相同甚至更优越的路用性能.%Pavement and maintenance of roads should consume a good deal of aggregates and mineral powders , and alternative use of recycled materials assists in protecting and saving natural resources. In combination with various road indices of asphalt mixtures and aggregates, this paper studies all types of recycled wastes used for pavement of asphalt roads, including industrial and construction wastes such as steel slag, glass, plastic, rubber, cement and ceramic, etc. as well as incineration ash of domestic garbage, etc. In according to their characteristics of grain size, hardness, roughness, porosity and elasticity, etc. the recycled wastes are applied in various bedding surface structures of roads respectively and embody the same road performance as natural aggregates and mineral powders and even more excellent.

  14. POROUS PAVEMENT PHASE I DESIGN AND OPERATIONAL CRITERIA (EPA/600/2-80/135)

    Science.gov (United States)

    Design and operational criteria, utilization concepts, benefits and disadvantages, as well as other characteristics of porous pavements are presented in this report. Particular emphasis is placed on porous asphalt pavements, but the criteria and design approach are applicable to ...

  15. Nonlinear fatigue damage characteristics analysis of asphalt pavement considering interlayer contact%考虑层间接触的沥青路面非线性疲劳损伤特性分析

    Institute of Scientific and Technical Information of China (English)

    孙志林; 黄晓明

    2012-01-01

    With the ABAQUS of the general finite element software and the secondary development platform, an asphalt pavement numerical model considering the pavement material nonlinear fatigue damage was established to analyze the influence of different contact condition on the damage degree at the bottom of the layer, the horizontal tensile stress at the bottom of the layer, the deflection on the surface of the pavement, and the fatigue life of the pavement structure. The results show that with the increase of the interlayer friction coefficient, the damage degree at the bottom of the base layer increases and the damage degree at the bottom of the sub-base layer decreases, and the two of them approach each other gradually. The horizontal tensile stress at the bottom of the base layer gradually decreases while the horizontal tensile stress at the bottom of the sub-base layer gradually increases. The deflection on the surface of the pavement decreases, the fatigue life of base decreases and the fatigue life of sub-base increases, and the two of them approaches each other gradually. In general, good interlayer contact condition can give full play to the role of various layer and enhance the carrying capacity of the structure.%运用通用有限元软件ABAQUS及其二次开发平台,建立考虑路面材料非线性疲劳损伤的沥青路面结构数值计算模型,分析不同层间接触状态对受损路面结构层底损伤度、结构层底水平正应力、路表弯沉以及对路面结构层疲劳寿命的影响.研究结果表明:随着面层与基层层间摩擦因数的逐步增大,基层层底损伤度逐步增加,底基层层底损伤度逐步减小,且两者逐渐接近;基层层底水平拉应力逐渐减小,底基层逐渐增大;路表弯沉逐渐减小;基层疲劳寿命减小,底基层疲劳寿命增加,且两者逐渐接近.总体来说,良好的层间接触状态能使各结构层充分发挥作用,从而增强结构整体承载能力.

  16. Application Research on Preventing Measures against Reflection Cracks of Asphalt Concrete Surface Covering Old Cement Pavement%旧水泥路面沥青加铺层防反射裂缝措施的应用与分析

    Institute of Scientific and Technical Information of China (English)

    张泽鹏; 王钊

    2014-01-01

    In this paper,the five common prevention measures against reflection crack that produced in asphalt concrete pavement covering an old cement concrete pavement have been introduced,including self-adhesive belt, thermal bonding belt,SAMI stress absorbing layer,geotextile and glass fiber grid. Through indoor fatigue tests and outdoor tests,comparison and analysis on application characteristic of the five prevention measures have been put forward.%针对旧水泥混凝土路面沥青加铺层结构中自粘式压缝带、热粘式压缝带、SAMI 应力吸收层、土工布及玻纤格栅等常用的五种延缓反射裂缝的处理措施,通过对其进行室内疲劳试验分析和室外试验评价,对比分析这五种处理措施的应用特点。

  17. Research on Nonlinear Property and Granular Base Modulus of Flexible Base Asphalt Pavement%柔性基层沥青路面非线性特性及模量研究

    Institute of Scientific and Technical Information of China (English)

    何兆益; 唐伯明

    2001-01-01

    Through laboratory research and theory analysis , the nonlinear property of semi-rigid asphalt pavement with granular (upper)base is studied and the modulus values of granular (upper)base is suggested. It is proved that the modulus of traditional flexible base is further smaller than granular(upper)base.In addition, the nonlinear property of granular (upper)base is advantageous to the fatigue of pavement.%从室内试验和理论分析两方面研究具有碎石上基层的半刚性沥青路面非线性特性和碎石上基层模量合理取值,研究结果表明碎石上基层具有比传统柔性基层高得多的弹性模量,此外碎石上基层非线性特性有利于重交通对路面的疲劳作用。

  18. 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.

  19. Study on Influence Factors of Anti-shear Performance of High Grade Asphalt Concrete Pavement%高等级沥青混凝土路面抗剪性能影响因素研究

    Institute of Scientific and Technical Information of China (English)

    王志强

    2014-01-01

    Based on the multilayered elastic system theory and the GAMES software,considering the thickness of pavement structure courses,the stiffness and the interface condition,the paper analyzed the change law of anti-shear performance of the asphalt pavement.The results show that:the effect of the thickness of the surface course and the base course on the asphalt pavement is insignificant,so it is a waste of cost to increase the thickness of the surface course and the base course to enhance the shearing capability;the shear stress peak value in the surface course would be reduced by increasing the modulus of base course,but the change is not obvious,which indicates that it does little to promote the anti-shear performance by increasing the modulus of base course;the more the modulus ratio between the wearing course and the mid-course,the greater the shear stress peak value in the surface course,which can be ob-viously seen;the shear stress peak value in the surface course would be reduced by the decrease of inter-facial bonding performance.%运用多层弹性体系理论,以 GAMES 软件为力学分析工具,考虑路面结构层厚度、基面层模量及层间状态等因素,分析沥青路面抗剪性能的变化规律。结果表明:沥青路面剪应力峰值受面层厚度和基层厚度影响不明显,通过增加面层厚度和基层厚度提高路面抗剪性能加重了经济成本,收效甚微;面层内剪应力峰值随基层模量增加而减小,但变化不明显,说明增加基层模量对沥青路面抗剪性能的提高作用不大;上面层与中面层模量比越大,上面层内剪应力峰值越大,且这种影响较为明显;在层间粘结减弱的过程中,面层内最大剪应力峰值随之减小。

  20. 沥青路面反射裂缝扩展机理与防裂效果分析%Analysis on Propagation Mechanism of Asphalt Pavement Reflective Crack and Anti-Cracking Effect

    Institute of Scientific and Technical Information of China (English)

    孙雅珍; 翟晓星; 李宁

    2012-01-01

    This paper aims to research the propagation mechanism of reflective crack and the anti-cracking effect of geosynthetics in semi-rigid base asphalt pavement. Using surface base stress and stress intensity factor analyses the propagation mechanism of semi-rigid base asphalt pavement reflective crack under different load function. Applying numerical analysis evaluates the anti-cracking effect of geosynthetics. Under symmetrical load, reflective cracks can not propagate. Under asymmetrical load, it will cause shearing type crack. Under temperature load,it will cause tensile type crack. After paving geosynthetics at asphalt surface base, the shear stress and tensile stress of surface base are decreased and the stress intensity factor of crack tip is also decreased. Under different load function, reflective cracks have different propagation mode. Geosynthetics can relieve the stress concentration of crack tip. Its anti-cracking effect is obvious.%目的 揭示半刚性基层沥青路面反射裂缝的扩展机理,确定土工合成材料的防裂效果.方法 利用面层底部应力和应力强度因子法分析合反射裂缝沥青路面结构在不同荷载作用下的裂缝扩展机理,并应用数值分析的方法来评价土工合成材料的防裂效果.结果 在正荷载作用下,裂缝不会扩展;在偏荷载作用下,会产生剪切型裂缝;在温度荷载作用下,会产生张开型裂缝.沥青面层底部加铺土工合成材料后,面层底部裂缝处产生的切应力与拉应力以及裂缝尖端的应力强度因子均得到了明显的减小.结论 在不同的荷载作用下,反射裂缝具有不同的扩展方式.土工合成材料可以有效地缓解裂缝尖端的应力集中,防裂效果明显.

  1. 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...

  2. Effects of temperature and water on pavement performance

    Energy Technology Data Exchange (ETDEWEB)

    Badu-Tweneboah, K.; Tia, M.; Ruth, B.E.; Richardson, J.M.; Armaghani, J.M.

    1987-01-01

    The 12 papers in the report deal with the following areas: procedures for estimation of asphalt-concrete pavement moduli at in-situ temperatures; stress caused by temperature gradient in portland-cement concrete pavements; characterizing temperature effects for pavement analysis and design; temperature response of concrete pavements; an examination of environmental versus load effects on pavements; moisture in portland-cement concrete; effect of rainfall on the performance of continuously reinforced concrete pavements in Texas; effect of moisture on the structural performance of a crushed-limestone road base; water-induced distress in flexible pavement in a wet tropical climate; an evaluation of design high-water clearances for pavements; economic impact of pavement subsurface drainage; use of open-graded, free-draining layers in pavement systems; a national synthesis report.

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

    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

  4. Resonance Testing of Asphalt Concrete

    OpenAIRE

    Gudmarsson, Anders

    2014-01-01

    This thesis present novel non-destructive laboratory test methods to characterize asphalt concrete. The testing is based on frequency response measurements of specimens where resonance frequencies play a key role to derive material properties such as the complex modulus and complex Poisson’s ratio. These material properties are directly related to pavement quality and used in thickness design of pavements. Since conventional cyclic loading is expensive, time consuming and complicated to perfo...

  5. Environmental Benefits of Warm Mix Asphalt

    OpenAIRE

    Zaumanis, M; OLESEN, E

    2010-01-01

    WMA is a relatively new technology that allows significant lowering of the production and pavement temperature of conventional hot mix asphalt (HMA). It promises various benefits, but probably the most significant is the possibility to reduce carbon footprint of asphalt thus supporting the demands of Kyoto protocol for lowering greenhouse gas emissions in the atmosphere.

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

    OpenAIRE

    M.O. Hamzah; Z. F. M. JAAFAR; Ahmad, F

    2013-01-01

    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 g...

  7. Operational properties of nanomodified stone mastic asphalt

    OpenAIRE

    Inozemtsev Sergey Sergeevich; Korolev Evgeniy Valer’evich

    2015-01-01

    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 physica...

  8. Comparison of laboratory test performance between asphalt-rubber hot mix and dense graded asphalt concrete

    OpenAIRE

    Sousa, Jorge B.; Pais, Jorge C.; Stubstad, Richard N.

    2000-01-01

    "Reflective cracking in pavements : research in practice" contains the Proceedings of the 4th International RILEM Conference on Reflective Cracking in Pavements (Proceedings PRO11). Asphalt-Rubber Hot-Mix (ARHM) has shown a higher resistance to flexural and reflective fatigue cracking, and also to permanent deformation, than conventional Dense Graded Asphalt Concrete (DGAC). Experience has demonstrated that with ARHM, a significant reduction in overlay thickness is possible, especially in...

  9. 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

  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. Long Life Pavements; Firmes de larga duracion

    Energy Technology Data Exchange (ETDEWEB)

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

    2009-07-01

    The existence of long-life pavements is not new; they have been built in Europe and the United States for decades. In fact, the concept arises from the observation of in-service roads; it was verified how particular pavements, initially designed for a 20-year service life, did not seem to have reduced the bearing capacity along the time, and its maintenance necessities had been exclusively focused on the wearing course. The base idea of long-life pavements is the existence of a fatigue threshold below which the damage produced by each load application is, in practice, zero or below the healing potential of the asphalt mix. The use practice of long-life pavements design considers a pavements constituted by three asphalt layers, each one with a very specific role: a wearing course that provides with the surface characteristics, an intermediate course that provides with most of the structural capacity and a base course that provides with the fatigue resistance. Furthermore, one of the particularities is the design against specific distress mechanisms. Maintenance strategy also presents specific particularities for long-life pavements. It is essentially focused on the detection of surface deterioration, and the appropriate and timely repair, before the damage extends beyond the wearing course, putting into risk the structural integrity of the pavement. Nowadays, this new way to conceive the design, the construction and the maintenance of road pavements, constitutes one of the main challenges for pavement engineering worldwide. (Author) 5 refs.

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

    OpenAIRE

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

    2014-01-01

    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 dat...

  13. 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

    2016-04-01

    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.

  14. 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.

  15. 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...

  16. 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.

  17. 冰劈效应对沥青路面表面裂缝的影响性分析%Impact of Ice-split Effect to Surface Cracking in Asphalt Pavement

    Institute of Scientific and Technical Information of China (English)

    赵岩荆; 倪富健

    2011-01-01

    In order to investigate the impact of ice-split on the propagation of the asphalt pavement surface cracking in the alternate freezing and thawing seasons, the pavement structure model was built by utilizing ABAQUS based on fracture mechanics. The variations of stress intensity factor under ice-split effect, thermal shrinkage effect and combination of both effects on pavement surface cracking were calculated. Besides, the effects of ponding depth in crack gap, crack width and crack length were evaluated. The Pearson correlation coefficients between these stress intensity factors were analyzed as well. The results indicate that ( 1 ) only a little of ponding in the crack gap can cause high stress intensify factor level under the ice-split effect, the stress intensify factor increases with the ponding depth increases, but the increasing degree decreases; (2)bigger crack width can result in the crack propagation more rapidly under ice-split effect, while the crack length has little effect on the stress intensity factor; (3) when there are both ice-split effect and thermal shrinkage effect exist, the Pearson related coefficient between the stress intensity factors which caused by the stress intensity factor and ice-split effect reaches over 0. 99; (4) the thermal shrinkage effect is not significant than the ice-split effect while inducing stress intensity factors. Therefore, the crack on the surface of pavement should be repaired as soon as possible to avoid being harmful by ice-split effect in the alternate freezing and thawing seasons. By this way, the pavement can be kept in good situation and the service life can be extended.%为研究冻融交替季节冰劈效应对沥青混凝土路面表面裂缝扩展的作用,基于断裂力学方法,采用ABAQUS有限元分析软件建立了路面结构模型,分别研究了路表裂缝在冰劈效应、温缩效应及二者结合作用下的应力强度因子随缝隙内积水深度、裂缝宽度以及裂缝长度等影响

  18. 基于环境温度变化的混合式基层沥青路面结构疲劳损伤分析%Fatigue damage analysis of composite base asphalt pavement structure based on change of ambient temperature

    Institute of Scientific and Technical Information of China (English)

    郭芳; 付宏渊; 邵腊庚

    2015-01-01

    In order to analyze the fatigue characteristics of composite base asphalt pavement structure under the change of ambient temperature, the impact of Hechi temperatures of each month in Guangxi and seasonal variations of subgrade resilient modulus were considered, and three kinds of asphalt pavement structures on composite base were put forward. With ABAQUS software, two states between layers were considered, and the temperature field, strain response and the cumulative fatigue damage of four pavement structures were calculated and analyzed. By monitoring results oftemperature sensors and strain gauges with straight road tests, simulation models were used to calculate fatigue damage of asphalt layer. The results indicate that the strain response with different temperature fields in each month in asphalt pavement is varied. When the temperature increases, the tensile strain at the bottom of asphalt layer increases. The fatigue damage in different seasons is varied and has high proportion in high temperature season. Based on the ambient temperature change considerations, the temperature sensitivity of scheme B is the smallest (scheme B means composite base asphalt pavement which is made of cement stabilized, graded gravel for the base layer and large size asphalt macadam mixture layer), and its fatigue damage is the minimum. The research results can provide reference for choosing good pavement structure on composite base.%为了分析环境温度变化时混合式基层沥青路面结构的疲劳损伤特性,拟定3种混合式基层沥青路面结构,充分考虑广西河池地区各月温度变化以及土基回弹模量的季节性变化,运用ABAQUS软件对2种层间结合状态的4种路面结构方案的温度场、应变响应和疲劳损伤进行计算分析,通过试验路面温度传感器、应变片的监测结果和疲劳损伤模拟模型计算沥青层的疲劳损伤。研究结果表明:在不同月份温度下,沥青路面应变响应差

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

    International Nuclear Information System (INIS)

    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

  20. 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.

  1. Rheological properties of asphalts with particulate additives

    Energy Technology Data Exchange (ETDEWEB)

    Shashidhar, N. [EBA Engineering, Baltimore, MD (United States); Chollar, B.H. [Federal Highway Administration, McLean, VA (United States)

    1996-12-31

    The Superpave asphalt binder specifications are performance-based specifications for purchasing asphalt binders for the construction of roads. This means that the asphalt is characterized by fundamental material (rheological) properties that relate to the distress modes of the pavements. The distress modes addressed are primarily rutting, fatigue cracking and low temperature cracking. For example, G*/sin({delta}) is designed to predict the rutting potential of pavements, where G* is the magnitude of the complex shear modulus and 6 is the phase angle. The binder for a road that is situated in a certain climatic zone requires the binder to have a minimum G*/sin({delta}) of 2200 Pa at the highest consecutive 7-day average pavement temperature the road had experienced. Implicit in such a performance based specification is that the fundamental property, G*/sin({delta}), of the binder correlates with rutting potential of the pavement regardless of the nature of the binder. In other words, the specification is transparent to the fact that the binder can simply be an asphalt, or an asphalt modified by polymers, particulates and other materials that can form a two-phase mixture. This paper discusses the asphalt-particulate system.

  2. Asphalt Mixture Design with Anti-skidding and Low Noise Performance in Tunnel Pavement%抗滑降噪型隧道沥青混合料设计

    Institute of Scientific and Technical Information of China (English)

    丛卓红; 王莎; 郑南翔; 孙国庆; 吴喜荣

    2012-01-01

    针对隧道路面噪音大、抗滑性能差、发生火灾时易引起沥青产生浓烟等缺陷,设计了抗滑降噪型沥青混合料,采用大空隙沥青混合料结构降低隧道路面噪音、提高抗滑性能,并采用阻燃剂降低隧道火灾危险性。对抗滑降噪型沥青混合料的降噪性能、抗剪性能、水稳定性能、渗水性能、抗滑性能等综合性能与空隙率的关系进行研究,确定合理空隙率,并铺筑试验路进行验证。结果表明:抗滑降噪型隧道沥青路面比普通隧道沥青路面噪音降低约6dB,抗滑性能提高20%;混合料的目标空隙率宜控制在19%,施工现场路面空隙率宜控制在16%~21%。在隧道中采用该混合料可有效提高隧道路面的使用性能,改善隧道运营环境。%Aimed at tunnel pavement's large noise, bad anti-skidding performance and dense smoke caused by possible fire, a anti-skidding and low noise asphalt mixture was designed to reduce noise, improve anti-skidding performance, and eliminate smoke. The large void ratio structure could reduce noise and improve anti-skidding performance. The fire retardant could prevent the fire hazard. The relationships of void ratio and mixture performances such as noise reduction, shearing, water stability, permeability, and anti-skidding were researched. The best void ratio was determined, which was verified on the test road. The results show that the application of this mixture in tunnel pavement can reduce noise about 6 dB more than that of the normal tunnel pavement mixture. The anti-skidding performance can be improved 20% more than that of the normal tunnel pavement mixture. The optimum void ratio is 19%. The void ratio in site should he within 16% to 21%. The tunnel pavement performance and environment can be improved by use of this mixture effectively.

  3. Performance prediction of hot mix asphalt from asphalt binders

    International Nuclear Information System (INIS)

    Asphalt binder being a high weight hydrocarbon contains asphaltene and maltene and is widely used as cementing materials in the construction of flexible pavements. Its performance in hot mix asphalt also depends on combining with different proportions of aggregates. The main objective of this study was to characterize asphalt cement rheological behavior and to investigate the influence of asphalt on asphalt-aggregate mixtures prepared with virgin binders and using polymers. Binder rheology and mixtures stiffness were determined under a range of cyclic loadings and temperature conditions. Master curves were developed for the evaluation of relationship between parameters like complex modulus and phase angle at different frequencies. Horizontal shift factors were also computed to determine time and temperature response of binders and mixes. The results showed that the stiffness of both the binder and the mixes depends on temperature and frequency of load. Polymer modified binder is least susceptible to temperature variations as compared to other virgin asphalt cement. Performance of asphalt mixtures can be predicted from those of asphalt binders using the master curve technique. (author)

  4. Asphalt solar collectors: A literature review

    International Nuclear Information System (INIS)

    Highlights: ► Solar energy can be harnessed by asphalt pavements. ► Research on asphalt thermal behavior and asphalt solar collectors is reviewed. ► Asphalt temperature is very sensitive to the variation of absortivity. ► Asphalt solar collector efficiency depends on flow rate and geometrical parameters. -- Abstract: Asphalt pavements subject to solar radiation can reach high temperatures causing not only environmental problems such as the heat island effect on cities but also structural damage due to rutting or hardening as a result of thermal cycles. Asphalt solar collectors are doubly effective active systems: as they solve the previously mentioned problems and, moreover, they can harness energy to be used in different applications. The main findings of the existing research on asphalt solar collectors are gathered together in this review paper. Firstly, the main heat transfer mechanisms involved in the solar energy collection process are identified and the most important parameters and variables are presented. After analyzing the theoretical foundations of the heat transfer process, this review focuses on the types of studies carried out so far on asphalt’s thermal behavior, different methodologies employed by other authors to study asphalt solar collectors and influence of the variables involved in thermal energy harvesting.

  5. 材料粘弹性对沥青混凝土钢桥面铺装结构疲劳寿命预估的影响%Influences of Viscoelasticity of Materials on Estimate of Fatigue Life of Pavement Structure of Asphalt Concrete Steel Deck

    Institute of Scientific and Technical Information of China (English)

    任开亮; 黄天贵; 赵国云

    2015-01-01

    为研究材料粘弹性对钢桥面浇注式沥青混凝土铺装结构疲劳寿命预估结果的影响,建立粘弹性有限元模型,分析不同荷载作用次数下铺装结构表面拉应变的变化规律,并基于应变控制的铺装面层混凝土疲劳方程预估铺装的使用寿命。结果表明:由于受材料粘弹性特性影响,随着荷载作用次数增加,钢桥面铺装表面拉应变也随之增大,铺装疲劳寿命降低;荷载作用20000次前变化更为明显,其后则趋于平缓。%In order to research influences of viscoelasticity of materials on estimate of fatigue life of pavement structure of asphalt concrete steel deck,this paper establishes a viscoelasticity finite element model and analyzes change rules of tensile strain on the surface of pavement structure at different action times of load,and estimates the service life of pavement based on strain controlled fatigue equation of surface concrete of pavement.The results show that the tensile strain on the surface of steel deck pavement increases with more action times of load due to influence of viscous and elastic properties,and fatigue life of pavement decreases;the change before 20 000 action times of load is more significant,and then becomes flat.

  6. 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...

  7. Rutting mechanisms and advanced laboratory testing of asphalt mixtures resistance against permanent deformation

    OpenAIRE

    Miljković Miomir; Radenberg Martin

    2011-01-01

    Permanent deformation in asphalt layers which manifestation on pavement surface is named rutting represents one of the most significant distresses of asphalt pavements. Depending on the level, it can be a huge inconvenience for traffic safety, driving comfort, and overall pavement life-cycle. Rutting may be classified into three basic types: one-dimensional or vertical compaction, lateral flow or plastic movement, and mechanical deformation. As an addition to Superpave® mixture volumetr...

  8. Fatigue laws for Brazilians asphalt rubber mixtures obtained in 4 point bending tests

    OpenAIRE

    Fontes, Liseane P. T. L.; Trichês, Glicério; Pais, Jorge C.; Pereira, Paulo A. A.

    2009-01-01

    The majority of Brazilian roadpavements consistsof thin pavement structures unable to resist the damage caused by heavy loads and an increasing traffic demand. The main structural distress modes found in Brazilians asphalt layers is fatigue cracking. One of the prom-ising techniques to improve the pavement performance is through asphalt rubber mixtures, which make use of crumb rubber from scrap tires to modify and enhance the properties of the asphalt. The inexistence of fatigue laws for asph...

  9. Effects of Crumb Rubber Size and Concentration on Performance of Porous Asphalt Mixtures

    OpenAIRE

    Altan Cetin

    2013-01-01

    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 deter...

  10. Use of tire rubber to improve fatigue performance of asphalt mixtures

    OpenAIRE

    Thives, L. P.; Trichês, Glicério; Pereira, Paulo A. A.; Pais, Jorge C.

    2010-01-01

    The accelerated failure of pavements is one of the main problems in Brazilian roads resulting from fatigue cracking due to the repeated application of traffic induced stresses. The incorporation of crumb rubber from waste tires in asphalt, named asphalt rubber, is a method which has been used in several countries to improve the properties of asphalt pavement mixtures and, at the same time, has been a ecologically alternative to deal with the proper disposal of waste tires. This...

  11. 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

  12. Control the Thickness of Asphalt Pavement Maintenance Measures%控制维修高速公路沥青路面厚度的措施

    Institute of Scientific and Technical Information of China (English)

    马尚

    2011-01-01

    The road maintenance tasks has increased year by year after China's highway mileage increase. In order to fulfill the job of local repairs, this article taking the combination of the actual highway pavement maintenance through the analysis on the principles of road paving thickness control, summed up the optimization of the construction process, and proposed to control the standards and quality assurance measures.%我国高速公路通车里程不断增加,路面维修的数量也在逐年加大,为了做好局部维修工作,本文结合高速公路的路面维修实际,通过分析路面摊铺厚度控制的原理,归纳了优化的施工工艺流程,提出了控制标准和质量保证措施。

  13. Change in fatigue behavior of asphalt hot mixes produced with asphalt rubber binders

    OpenAIRE

    Neto, Silvrano Adonias Dantas; Farias, Farias, Márcio Muniz de; Pais, Jorge C.

    2009-01-01

    Fatigue life of asphalt hot mixes is given as a function of both stiffness and tensilestrains induced in the bottom of the wearing courses of flexible pavements. In conventional as-phalt hot mixes the increase of stiffness leads to a decrease of fatigue life. However, this work shows that there is an increase of both fatigue life and stiffness of asphalt rubber hot mixes in comparison with the asphalt hot mixes produced with straight binders. In this work laboratory tests were performed in as...

  14. 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.

  15. Dynamic linear viscoelastic properties and extensional failure of asphalt binders

    Science.gov (United States)

    Ruan, Yonghong

    Billions of dollars are spent annually in USA to maintain old pavements that are badly cracked. In order to reduce this expenditure, it is desirable to have criteria for selecting asphalts with superior cracking resistance that will provide pavements with longer durability. Literature reports indicate that the ductility of binders recovered from asphalt pavements correlates with cracking failure. However, ductility measurement is a time and material consuming process, and subject to reproducibility difficulties, as are all failure tests. In addition, ductility measurement does not belong to the currently used Superpave(TM) specification. Correlations between ductility and dynamic viscoelastic properties (measured with the dynamic shear rheometer, DSR), which are much easier and faster to perform and may be included into the Superpave(TM) system, are studied for both straight and modified binders. Ductility correlates quite well with G'/(eta '/G') for conventional asphalt binders aged at different conditions, especially when ductility is below 10 cm. However, for modified asphalts, there is no universal correlation between ductility and G'/(eta'/G'), even in the low ductility region. As far as the asphalt binder in pavement is concerned, the loss due to oxidative aging of its ductility is an important reason for pavement cracking. Polymer modification modifies the rheological and oxidative hardening properties of asphalt binders. The effect of polymeric modifiers on various properties of asphalt binders was investigated. Modifiers studied were diblock poly (styrene-b-butadiene) rubber (SBR), triblock poly (styrene-b-butadiene-b-styrene) (SBS), and tire rubber. Polymer modified binders have a lower hardening and oxidation rate than their corresponding base asphalts. In addition, modified binders have lower hardening susceptibility compared with their base materials and in some cases the results can be dramatic. Polymer modification improves asphalt binders' shear

  16. 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.

  17. Classification of recycled asphalt 'RA' material

    OpenAIRE

    Wendling, Louisette; DE LA ROCHE SAINT ANDRE, Chantal; Gaudefroy, Vincent; Marsac, Paul; TEBALDI, Gabriele; DAVE, Eshan; HUGENER, Martin; BOCCI, Maurizio; LOIZOS, Andreas; JENKINS, Kim; MARRADI, Alessandro; Grilli, Andrea; Graziani, Andrea; PASETTO, Marco; MURAYA, Patrick

    2012-01-01

    Use of recycled asphalt pavements (RA) in pavement rehabilitation processes is continuously growing as recycling techniques, such as cold recycling (CR), are being utilized in increasing magnitude. The focus of this paper is on developing a state of the art and state of the practice summary of processes used for classification of RA. A variety of topics were explored through an exhaustive literature search, these include RAP production methods, definition of RA materials, stockpiling practice...

  18. "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...

  19. 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

  20. 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

  1. 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.

  2. Selection of Sizes of Vibrating Screens in Crushing Plant of Asphalt Pavement%沥青路面碎石场振动筛配筛的选择

    Institute of Scientific and Technical Information of China (English)

    王瑞林; 秦勇

    2016-01-01

    By analyzing the aggregate produced by different screen sizes and vibrating screens at different angles in crushing plant,this paper studies provision of screens for aggregate used for AC-20 and AC-16 asphalt mixtures in crushing plant.The results of study show that 23,11,6 and 3mm vibrating screens are appropriated for cold AC -16 mixture;when the screening result of aggregate does not satisfy the requirement,first check whether the angle of vibrating screens is appropriated or not,and then adjust screen size after adjustment to qualified angle,if the screen angle cannot be adjusted,enlarge the screen size to a certain degree based on the reasonable screen size.%通过分析碎石场不同筛孔尺寸及不同角度振动筛所生产的集料,研究碎石场AC-20及AC-16沥青混合料所用集料的配筛情况.研究结果表明:AC-20沥青混合料冷料振动筛配筛为23、11、6、3 mm较为合适,AC-16混合料冷料振动筛配筛为19、11、6、3 mm较为合适;集料筛分结果不满足要求时,首先查看振动筛筛网角度是否合适,调整到合格角度后再调整筛孔尺寸,若无法调整筛网角度,则在合理筛网尺寸上一定程度地放大.

  3. 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.  ……

  4. Deformation Parameters and Fatigue of the Recycled Asphalt Mixtures

    OpenAIRE

    Šrámek Juraj

    2015-01-01

    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...

  5. The Development of Moisture Sensitivity Test for Compacted Asphalt

    OpenAIRE

    M.K. Shamshuddin; M.E. Abdullah; Rhasbudin Shah, S.M.

    2011-01-01

    Moisture damage is one of the major issues in asphalt distress. It is due to the adhesive and cohesive failure of asphalt mixture and it will shorten pavement life. Moisture-sensitive mixtures need to be identified during the course of the mixture design process which fulfills the specified minimum standard. The laboratory testing procedures currently available for compacted Hot Mix Asphalt (HMA) to test the moisture sensitivity were primarily developed to determine the degree ...

  6. Determination of Rheological Properties of Bio Mastic Asphalt

    OpenAIRE

    R. Muniandy; H. Jafariahangari; Yunus, R.; S. Hassim

    2008-01-01

    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 land...

  7. Comparison between asphalt rubber and conventional mixtures in overlay design

    OpenAIRE

    Fontes, Liseane P. T. L.; Trichês, Glicério; Pereira, Paulo A. A.; Pais, Jorge C.

    2008-01-01

    Asphalt modified with crumb rubber has been used to produce asphalt rubber mixtures for pavement overlays subjected to heavy loads and high temperatures. Under severe conditions, these mixtures are capable of resisting permanent deformations, having an extended fatigue life and resisting crack propagation in comparison to conventional ones. A laboratory research was conducted to determine the performance properties of overlays with asphalt rubber mixtures produced through wet processes using ...

  8. Thermal Properties of Asphalt Mixtures Modified with Conductive Fillers

    OpenAIRE

    Byong Chol Bai; Dae-Wook Park; Hai Viet Vo; Samer Dessouky; Ji Sun Im

    2015-01-01

    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 pro...

  9. Assessment of highway pavements using GPR

    Science.gov (United States)

    Plati, Christina; Loizos, Andreas

    2015-04-01

    Highway infrastructure is a prerequisite for a functioning economy and social life. Highways, often prone to congestion and disruption, are one of the aspects of a modern transport network that require maximum efficiency if an integrated transport network, and sustainable mobility, is to be achieved. Assessing the condition of highway structures, to plan subsequent maintenance, is essential to allow the long-term functioning of a road network. Optimizing the methods used for such assessment will lead to better information being obtained about the road and underlying ground conditions. The condition of highway structures will be affected by a number of factors, including the properties of the highway pavement, the supporting sub-base and the subgrade (natural ground), and the ability to obtain good information about the entire road structure, from pavement to subgrade, allows appropriate maintenance programs to be planned. The maintenance of highway pavements causes considerable cost and in many cases obstruction to traffic flow. In this situation, methods that provide information on the present condition of pavement structure non-destructively and economically are of great interest. It has been shown that Ground-Penetrating-Radar (GPR), which is a Non Destructive Technique (NDT), can deliver information that is useful for the planning of pavement maintenance activities. More specifically GPR is used by pavement engineers in order to determine physical properties and characteristics of the pavement structure, information that is valuable for the assessment of pavement condition. This work gives an overview on the practical application of GPR using examples from highway asphalt pavements monitoring. The presented individual applications of GPR pavement diagnostics concern structure homogeneity, thickness of pavement layers, dielectric properties of asphalt materials etc. It is worthwhile mentioning that a number of applications are standard procedures, either

  10. 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.

  11. Optimization of asphalt rubber hot mixes based on performance laboratory tests

    OpenAIRE

    Neto, Silvrano Adonias Dantas; Farias, Márcio Muniz de; Pais, Jorge C.; Pereira, Paulo A. A.

    2003-01-01

    Asphalt binders modified with crumb rubber recycled from ground tires have been successfully used in asphalt mixtures improving the mechanical and functional behaviour of the pavements. This paper shows the influence of several factors that affect the behaviour of asphalt-rubber (AR) and of hot mixes made with this material. Modified binders were prepared using a straight binder with 35/50 penetration and rubber obtained by the environmental process. Samples of asphalt-rubber w...

  12. TECHNOLOGY OF DISPERSED REINFORCEMENT OF ASPHALT CONCRETE MIXTURES WITH CHRYSOTILE FIBRES

    OpenAIRE

    S. I. Buldakov; A. Yu. Dedyukhin

    2010-01-01

    Problem statement. The issues of technology of preparation of dispersed rein-forced asphalt concrete mixtures are still not clearly understood. Available tech-nologies of dispersed reinforcement involve application of granulated additives, which permits the quality of asphalt concrete mixtures to be improved and, there-fore, it will result in increasing life expectancy of asphalt concrete pavements.Results and conclusions. The ways of improvement of quality and durability of asphalt-concrete ...

  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. 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.

  15. Effect of the weather in the aging of asphalts by XRD

    International Nuclear Information System (INIS)

    Asphalt is a sticky, black and highly viscous liquid or semi-solid that is presented in most crude petroleum and in some natural deposits. As is well known, asphalt has been the preferential choice in pavement construction since excellent utility of pavement, however, as other organic substances, it is also subjected to aging phenomena evolving with time. Asphalt aging is one of the principal factors causing deterioration of asphalt pavements. The photodegradation of asphalts must be considered in the study of the performance of asphalt pavement, especially in geographical regions where high solar radiation intensity occurs. It has an important influence in asphalt aging in tropical places as Brazil. Many methods have been applied to simulate aging of bitumen. It was just a simulation but not real aging asphalt. In this study we submitted the asphalt to the weather as sun and rain. Periodically, during 430 days, the XRD profiles were done and the results analyzed. The scattering measurements were carried out in 0-20 reflection geometry using a powder diffractometer Shimadzu XRD-6000. Scans were typically done from 8 deg to 28 deg every 0.05 deg. The parameters FWHM and peak centroid were analyzed. From 0 until 180 days the aging was faster. The peaks were marked and analyzed with the pass of time. The crystallinity of asphalt increase with weather exposition. Some angles of profiles changed the position indicating change of atomics plans. (author)

  16. Development of high stability hot mix asphalt concrete with hybrid binder

    Directory of Open Access Journals (Sweden)

    Toshiaki Hirato

    2014-12-01

    Full Text Available Cost reduction of public works projects has been desired due to severe financial circumstances. Therefore, asphalt pavement has been requested to extend its life. Semi-flexible pavement or epoxy asphalt pavement, which has high rutting resistance and oil resistance, may be applied to the place where these performances ae demanded. However, special technique is required in manufacturing and construction. In addition, these materials have also raised a problem that they cannot be recycled. Meanwhile, conventional asphalt pavement has several drawbacks. It is vulnerable to rutting caused by traffic load and damage caused by petroleum oils such as gasoline or motor oil. The materials used in asphalt mixtures were studied for improving the durability of asphalt mixture. A high stability asphalt concrete was developed which has equal or superior performance to semi-flexible pavement and epoxy asphalt pavement. In this paper, the process of selecting the substance and the characteristics evaluation of the developed mixtures ae described. Furthermore, an inspection result as well as follow-up survey of the performance of the developed mixtures obtained from trial and actual construction is shown.

  17. Application of asphalt rubber technology to recreational trails

    Science.gov (United States)

    Ni, Haifeng

    Crumb rubber aggregate was employed instead of stone/sand aggregate in asphalt pavement that was modified by fine rubber particles. Crumb rubber aggregate forms an elastic network in the asphalt, which improves the pavement's susceptibility to low-temperature cracking, and absorb more stress at the crack tips than the conventional asphalt pavement. Laboratory tests were conducted to evaluate the tension/compression performance of a blend of asphalt rubber with rubber aggregate (ARRA). An optimum design methodology was introduced by examining the effect of asphalt source, curing temperature, curing time, rubber content, aggregate size, compaction pressure, and the effect of certain additives. At ambient temperature, the ARRA with equal amount of binder and aggregate exhibits good mechanical properties. Vestenamer helps improve the pavement's strength, stiffness, and fracture resistance to low temperature cracking. It was demonstrated that such pavement meets the mechanical requirements for recreational trails, such as bicycle, or pedestrian trails. ARRA is a viscoelastic material which exhibits time-dependent and loading rate-dependent behavior. Temperature is a key issue to its response to an external load. Both temperature and rate dependences were investigated. A series of uniaxial compression relaxation tests on ARRA or Vestenamer modified ARRA were conducted at room temperature to study the time-dependent performance of ARRA. Schapery's theory was applied to characterize the nonlinear viscoelastic behavior of ARRA.

  18. Application of surplus and waste materials in roads pavement making

    OpenAIRE

    S.M. Mousavi; Fazli, A. H.; Rouzmehr, F.

    2011-01-01

    Nowadays there are a lot of problems about surpluses and debris made by humans all around the world. Lots of these surpluses seriously harm our natural environment. Reuse of this kind of materials in other processes like building constructions or pavement help our natural environment in every aspect. Asphalt concrete is the main part of pavements in most parts of the world with an increasing rate of production in need of more ways and roads. In this paper we will provide...

  19. Reliability-based Design Procedure for Flexible Pavements

    OpenAIRE

    Dinegdae, Yared Hailegiorgis

    2015-01-01

    Load induced top-down fatigue cracking has been recognized recently as a major distress phenomenon in asphalt pavements. This failure mode has been observed in many parts of the world, and in some regions, it was found to be more prevalent and a primary cause of pavements failure. The main factors which are identified as potential causes of top down fatigue cracking are primarily linked to age hardening, mixtures fracture resistance and unbound layers stiffness. Mechanistic Empirical analytic...

  20. Scheme Analysis on Asphalt Concrete Covering Cement Pavement of Guangzhao Expressway%广肇高速公路水泥路面加铺沥青砼方案分析

    Institute of Scientific and Technical Information of China (English)

    谢永明

    2014-01-01

    The length of cement pavement of Guangzhao Expressway is 10Km.According to the actual traffic load,stress condition of the pavement,cost reduction and convenience of maintenance after pavement overla-ying,the necessity of overlaying for cement pavement has been analyzed.Combined with experiences from other cement pavement overlaying projects,through the overlay structure calculation,a feasible scheme of overlaying for cement pavement of Guangzhao Expressway has been put forward,which could provide references for relative project management units.%广肇高速公路水泥路面长度为10km,结合实际交通荷载情况、路面受力状况、加铺后养护成本降低及养护便利性等方面分析了广肇高速公路水泥路面加铺的必要性,结合省内相关加铺项目的经验,通过加铺层结构计算,提出了广肇高速公路水泥路面加铺的可行方案,可供相关项目管理单位参考。

  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. Rutting based evaluation of asphalt mixes

    International Nuclear Information System (INIS)

    Pavement rutting is one of the most common and destructive pavement distresses being observed in flexible pavements, which is primarily due to a-x-le loads that exceed legal limit and high ambient temperatures, and also poor mix design is one of the cause of rutting. The drastic increase in traffic volume during last few decades has resulted in premature pavement fillers of almost the whole road structure in Pakistan. In this scenario it is the time to investigate this problem and propose appropriate solution. Physical properties of aggregates and bitumen were evaluated in the laboratory. Mechanical Properties of three mixes. i.e., Marshall, Super pave and Stone Mastic Asphalt (SMA) were evaluated by performing creep test. indirect tensile test and dynamic modulus in order to compare the performance of mixes under prevailing load and environmental conditions of Pakistan. The study revealed that Super pave mixes performed better than Marshall and SMA. (author)

  3. State-of-art of asphalt surfacings on long-spanned orthotropic steel deck in China

    OpenAIRE

    Chen, X.; Liu, X.; Qian, Z.; Lei, Z

    2012-01-01

    Reliable and durable asphalt surfacing systems still remain to be desired for the long-spanned orthotropic steel bridges as the nationally and internationally reports on distresses in deck pavement. Based on ten-year research works, this paper has presented a brief review and discussion of the Chinese practices and experiences of deck pavement on long-spanned steel bridges, including issues of typical surfacing materials and their properties, main distresses in asphalt surfacing, and the basi...

  4. Nondestructive evaluation of the complex modulus master curve of asphalt concrete specimens

    Science.gov (United States)

    Gudmarsson, A.; Ryden, N.; Birgisson, B.

    2013-01-01

    The dynamic Young's modulus of asphalt concrete is directly related to pavement quality and is used in thickness design of pavements. There is a need for a nondestructive laboratory method to evaluate the complex modulus, which can be linked to nondestructive field measurements. This study applies seismic measurements to an asphalt concrete beam where resonant acoustic spectroscopy and optimization of frequency response functions are used to estimate the complex moduli. A good estimation of the master curve is obtained.

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

    OpenAIRE

    Abd El Halim Omar Abd El Halim; Amir Omar Abd El Halim; Moustafa Awadalla; Mohamed Adel Hassanin

    2015-01-01

    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 i...

  6. 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...

  7. 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.

  8. Research on Surfactant Warm Mix Asphalt Construction Technology

    Science.gov (United States)

    Li, Guoliang; Sun, Jingxin; Guo, Xiufeng

    Discharging temperature of hot asphalt mixture is about 150°C-185°C, volatilization of asphalt fume harms people's health and fuel cost is high. Jinan Urban Construction Group applies PTL/01 asphalt warm mix agent to produce warm mix asphalt to construction of urban roads' asphalt bituminous pavement. After comparing it with performance of traditional hot asphalt mixture, mixing temperature may be reduced by 30°C-60°C, emission of poisonous gas is reduced, energy conservation and environmental protection are satisfied, construction quality reaches requirements of construction specifications and economic, social and environmental benefits are significant. Thus, it can be used for reference for green construction of urban roads.

  9. Effect of moisture on the aging behavior of asphalt binder

    Science.gov (United States)

    Ma, Tao; Huang, Xiao-Ming; Mahmoud, Enad; Garibaldy, Emil

    2011-08-01

    The moisture aging effect and mechanism of asphalt binder during the in-service life of pavement were investigated by laboratory simulating tests. Pressure aging vessel (PAV) test simulating the long-term aging of binder during the in-service life of pavement was modified to capture the long-term moisture aging effect of binder. Penetration grade tests including penetration test, soften point test, and ductility test as well as Superpave™ performance grade tests including viscosity test, dynamic shear rheometer test, and bending beam rheometer test were conducted to fully evaluate the moisture aging effect of binder. Fourier transform infrared spectroscopy test and Gel-permeation chromatography test were applied to provide a fundamental understanding of the moisture aging mechanism of binder. The results indicate that moisture condition can accelerate the aging of asphalt binder and shorten the service life of asphalt binder. The modified PAV test with moisture condition can well characterize the moisture aging properties of asphalt binder.

  10. 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,

  11. 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

  12. 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.

  13. 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.

  14. Stiffness of Hot-Mix Asphalt

    OpenAIRE

    Pellinen, Terhi K.; Xiao, Shangzhi

    2006-01-01

    This research was initiated from a need to evaluate marginal mixtures that do not meet the Superpave mix design criteria for the air voids content requirements for the construction of hot mix asphalt pavements. The developed criteria is comprised of the base criteria derived from test data of as-placed field cores normalized to 7.5% air voids content, which provides the minimum stiffness and strength requirements for a mixture as a function of the traffic level. The stiffness of pavement core...

  15. Hybrid green permeable pave with hexagonal modular pavement systems

    International Nuclear Information System (INIS)

    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.

  16. 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.

  17. Mechanistic and Economical Characteristics of Asphalt Rubber Mixtures

    OpenAIRE

    Mena I. Souliman; Annie Eifert

    2016-01-01

    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 Ru...

  18. The temperature effect on the reflective cracking of asphalt overlays

    OpenAIRE

    Minhoto, Manuel; Pais, Jorge; Pereira, Paulo

    2008-01-01

    This paper presents a study about the influence of temperature on the reflective cracking in a flexible road pavement through the evaluation of the asphalt overlay damage associated to traffic and temperature variations throughout a year. This study was developed from a numerical simulation of the asphalt overlay behaviour based on a three-dimensional finite-element analysis, considering the simultaneous loading of traffic and temperature variations. A mechanistic-based overlay design method ...

  19. 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.

  20. 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...

  1. Modeling of asphalt by means of discrete element method – an initial study

    OpenAIRE

    Feng, Huan; Hededal, Ole; Stang, Henrik

    2013-01-01

    Asphalt is a viscous material consisting of a matrix of stones, sand and filler glued together by a bituminous binder, which is used in many pavement constructions. Knowledge about asphalt is mainly based on the results of experimental and empirical investigation, which comes at the expense of conducting time-consuming and lab-costly procedures. The use of numerical models, capable of reducing greatly the testing cost, has shown great potential in characterizing asphalt-aggregate mixtures for...

  2. The Effects of Salt on Rheological Properties of Asphalt after Long-Term Aging

    OpenAIRE

    Xin Yu; Ying Wang; Yilin Luo; Long Yin

    2013-01-01

    Limited studies in recent years have shown that asphalt pavement subject to seawater in coastal regions or deicing salt in cold regions may be seriously damaged after being soaked in saline water for a long time. However, there is limited research into the influence of salt on rheological properties of asphalt after long-term aging. In this study, rheological properties of unmodified and polymer-modified asphalt after long-term aging were tested after being soaked in different concentrations ...

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

    OpenAIRE

    Peralta, J.; Silva, Hugo Manuel Ribeiro Dias da; Williams, R. Christopher; Rover, Marjorie; Machado, A.V.

    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...

  4. The effect of loading time on flexible pavement dynamic response: a finite element analysis

    Science.gov (United States)

    Yin, Hao; Solaimanian, Mansour; Kumar, Tanmay; Stoffels, Shelley

    2007-12-01

    Dynamic response of asphalt concrete (AC) pavements under moving load is a key component for accurate prediction of flexible pavement performance. The time and temperature dependency of AC materials calls for utilizing advanced material characterization and mechanistic theories, such as viscoelasticity and stress/strain analysis. In layered elastic analysis, as implemented in the new Mechanistic-Empirical Pavement Design Guide (MEPDG), the time dependency is accounted for by calculating the loading times at different AC layer depths. In this study, the time effect on pavement response was evaluated by means of the concept of “pseudo temperature.” With the pavement temperature measured from instrumented thermocouples, the time and temperature dependency of AC materials was integrated into one single factor, termed “effective temperature.” Via this effective temperature, pavement responses under a transient load were predicted through finite element analysis. In the finite element model, viscoelastic behavior of AC materials was characterized through relaxation moduli, while the layers with unbound granular material were assumed to be in an elastic mode. The analysis was conducted for two different AC mixtures in a simplified flexible pavement structure at two different seasons. Finite element analysis results reveal that the loading time has a more pronounced impact on pavement response in the summer for both asphalt types. The results indicate that for reasonable prediction of dynamic response in flexible pavements, the effect of the depth-dependent loading time on pavement temperature should be considered.

  5. Extending the Lifespan of Porous Asphalt Concrete

    OpenAIRE

    Zhang, Y.

    2015-01-01

    Porous Asphalt (PA) concrete is widely used as a surfacing layer on highways in the Netherlands. The service life of PA wearing courses is limited because of the fact that it is vulnerable to raveling. The possibilities of applying preventive maintenance to PA wearing courses by means of spraying rejuvenation products on the pavement surfaces are being investigated with high interest in the Netherlands. A material which has the ability to penetrate into the bituminous binder and soften (rejuv...

  6. Optimizing Use Of Marshall Asphalt Mix Design

    OpenAIRE

    Lindly, Jay

    1997-01-01

    Rutting has been a problem in Qatar's highway pavements since it began designing asphalt mixtures with the Marshall Method in the early 1990's. This paper describes specifications and rules-of-thumb which have been generated in the United States which may provide insight to Qatar's rutting problem and suggests modifications to mix design and construction procedures. The paper describes appropriate bitumen and aggregate specifications and discusses field procedures to implement mix design va...

  7. Warm mixes asphalt : Laboratory evaluation of two mix design methods

    OpenAIRE

    MAILLARD NUNES, Patrícia; DONY, Anne; KLINCEVICIUS, Mary; MOTTA, Rosângela; Bernucci, Liedi; DEL PRIORE, Claudio; Brosseaud, Yves; Gaudefroy, Vincent; COLIN, Johan

    2009-01-01

    From a French-Brazilian partnership among Escola Politécnica da Universidade de São Paulo (LTP - Laboratory of Pavement Technology), Ecole Spéciale de Travaux Publics ESTP (GREMACOR Laboratory) and Laboratoire Central des Ponts et Chaussées (LCPC Division SMIT), a study on warm mixes asphalt was developed. Since 2003, new asphalt mixes that are set between hot and cold mixes have been developed with the purpose of reducing mixing and compaction temperatures of hot mixes asphalt, yet maintain...

  8. 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.

  9. How good are linear viscoelastic properties of asphalt binder to predict rutting and fatigue cracking

    Energy Technology Data Exchange (ETDEWEB)

    Chen, J.S.; Tsai, C.J. (National Cheng Kung Univ., Tainan (Taiwan, Province of China). Dept. of Civil Engineering)

    1999-08-01

    This article evaluates the effects of linear viscoelastic properties of asphalt on pavement rutting and fatigue cracking. The parameters in the binder specification recently developed by the Strategic Highway Research Program (SHRP) were also compared for pavement performance. Two studies were conducted for asphalt-aggregate mixes. The first study was the wheel tracking test to evaluate the rutting of mixes containing three asphalts. The second study was a detailed field study of the effects of binder properties on the pavement performance of eight different sections. Results of both investigations indicated that SHRP parameters were not sufficient indicators for predicting the rutting and fatigue cracking of pavements. The discrepancies between performance data and existing parameters of the binder mainly resulted from the inherited assumptions made during the specification development, that is, stress- or strain-controlled mode and traffic loading frequency. In order to directly relate the linear viscoelastic properties of asphalt binders to pavement performance, calculating the dissipated energy per traffic cycle, W[sub d], became imperative. Fundamental derivation of W[sub d] was developed in this study. Results indicated that W[sub d] could predict the rutting and fatigue cracking of pavements reasonably well, This study, proposed the dissipated energy, W[sub d], as the single parameter for evaluating pavement rutting and fatigue cracking.

  10. 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.

  11. 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.

  12. 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

  13. 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…

  14. Investigation of Asphalt Mixture Creep Behavior Using Thin Beam Specimens

    International Nuclear Information System (INIS)

    The asphalt pavement layer consists of two or more lifts of compacted asphalt mixture; the top of the layer is also exposed to aging, a factor that significantly affects the mixture properties. The current testing specifications use rather thick specimens that cannot be used to investigate the gradual change in properties with pavement depth. This paper investigates the feasibility of using the 3-point bending test with thin asphalt mixture beams (127x12.7x6.35 mm) to determine the low-temperature creep compliance of the mixtures. Several theoretical and semi-empirical models, from the theory of composites, are reviewed and evaluated using numerical and experimental data. Preliminary results show that this method can be used for low-temperature mixture characterization but several crucial factors need further inspection and interpretation

  15. Experimental Study of the Anti-Skid Property Scenic Asphalt Pavements in the Southern Region%南方景区道路抗滑沥青路面路用性能试验

    Institute of Scientific and Technical Information of China (English)

    傅东阳; 胡昌斌; 陈永乐

    2011-01-01

    为了改善景区道路的安全性和抗滑性,分析了级配的类型和集料的种类对沥青混合料各项性能的影响,特别是对沥青混合料的抗滑性能的影响.结果表明,采用中粒式沥青混合料适合于高温地区道路的高温稳定性要求;采用空隙率小于5%的密实混合料级配适合于湿润多雨气候条件下的沥青路面水稳性的要求.为了改善陡坡路段沥青路面抗滑性能,级配中应该增加粒径大于4.75 mm的粗集料的含量.%In order to improve the safety and anti-skid property of the scenic roads, the affection of the types of gradation and aggregates on various properties of asphalt mixture has been investigated in this paper, especially on the anti-skid property. The results show that medium-size asphalt mixture is suitable for the high temperature stability in the high temperature region. The dense-graded mixture with less than 5% void content can satisfy the requirements for asphalt water-stability in the wet and rainy conditions. To improve anti-skid property in the steep slope, the concentration of coarse aggregates with the diameter larger than 4.75 mm should be increased.

  16. Leachability of dissolved chromium in asphalt and concrete surfacing materials.

    Science.gov (United States)

    Kayhanian, Masoud; Vichare, Akshay; Green, Peter G; Harvey, John

    2009-08-01

    Leachate metal pollutant concentrations produced from different asphalt and concrete pavement surfacing materials were measured under controlled laboratory conditions. The results showed that, in general, the concentrations of most metal pollutants were below the reporting limits. However, dissolved chromium was detected in leachate from concrete (but not asphalt) specimens and more strongly in the early-time leachate samples. As the leaching continued, the concentration of Cr decreased to below or close to the reporting limit. The source of the chromium in concrete pavement was found to be cement. The concentration of total Cr produced from leachate of different cement coming from different sources that was purchased from retail distributors ranged from 124 to 641mug/L. This result indicates that the potential leachability of dissolved Cr from concrete pavement materials can be reduced through source control. The results also showed that the leachability of dissolved Cr in hardened pavement materials was substantially reduced. For example, the concentration of dissolved Cr measured in actual highway runoff was found to be much lower than the Cr concentration produced from leachate of both open and dense graded concrete pavement specimens under controlled laboratory study. It was concluded that pavement materials are not the source of pollutants of concern in roadway runoff; rather most pollutants in roadway surface runoff are generated from other road-use or land-use sources, or from (wet or dry) atmospheric deposition. PMID:19604624

  17. 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...

  18. 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.

  19. 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.

  20. Evolution of the asphaltic cements specification in the developing countries; Evolucao das especificacoes de cimentos asfalticos nos paises desenvolvidos

    Energy Technology Data Exchange (ETDEWEB)

    Leite, Leni F.M.; Constantino, Romulo S. [PETROBRAS, Rio de Janeiro, RJ (Brazil). Centro de Pesquisas; Tonial, Ilonir A. [PETROBRAS S.A., Rio de Janeiro, RJ (Brazil). Abastecimento

    2000-07-01

    After SUPERPAVE binder specifications implementation in USA and Canada in 1997, regarding rheological tests, relating to pavement performance, Europe is studying the possibility to include some parameters already developed by SUPERPAVE in the new European binder specifications to be launched by the end of 2000. Australia, South Africa and New Zealand are also developing researches in this field. The employment of polymer modified asphalts are also increasing the search for new tests that present correlation with pavement performance. In Brazil, the petroleum company PETROBRAS has been using since 1994 rheological tests to the evaluation of asphalt cements and modified asphalts. (author)

  1. 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.

  2. 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.

  3. Current practices for modification of paving asphalts

    Energy Technology Data Exchange (ETDEWEB)

    Bahia, H.U.; Perdomo, D. [Asphalt Institute, Lexington, KY (United States)

    1996-12-31

    The Superpave binder specification, AASHTO MP1, has introduced new concepts for selecting paving asphalt binders. The specification, in addition to using rheological and failure measurements that are more related to performance, is based on the idea that the criteria to maintain a satisfactory contribution of asphalt binders to the resistance of pavement failures remains the same but have to be satisfied at critical application temperatures. The test procedures require that the material be characterized within certain ranges of strains or stresses to ensure that material and geometric non-linearities are not confounded in the measurements. These new specification concepts have resulted in re-evaluation of asphalt modification by the majority of modified asphalt suppliers. The philosophy of asphalt modification is expected to change, following these new concepts, from a general improvement of quality to more focus on using modifiers based on the most critical need as defined by two factors: (1) The application temperature domain and (2) the type of distress to be remedied. The new specification requirements should result in a more effective use of modifiers as the amount and type of modifier will be directly related to the application environment and the engineering requirements.

  4. Water quality and quantity assessment of pervious pavements performance in experimental car park areas

    OpenAIRE

    Sañudo Fontaneda, Luis Ángel; Charlesworth, Susanne M.; Castro Fresno, Daniel; Andrés Valeri, Valero Carlos Alessio; Rodríguez Hernández, Jorge

    2014-01-01

    Pervious pavements have become one of the most used sustainable urban drainage system (SUDS) techniques in car parks. This research paper presents the results of monitoring water quality from several experimental car park areas designed and constructed in Spain with bays made of interlocking concrete block pavement, porous asphalt, polymer-modified porous concrete and reinforced grass with plastic and concrete cells. Moreover, two different sub-base materials were used (limestone aggregates a...

  5. 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. PMID:25574851

  6. 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.

  7. 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. PMID:23434738

  8. 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.

  9. A comprehensive approach for the assessment of in-situ pavement density using GPR technique

    Science.gov (United States)

    Plati, Christina; Georgiou, Panos; Loizos, Andreas

    2013-04-01

    Proper construction of the asphalt pavement is a prerequisite to developing a long lasting roadway that does not require extensive future maintenance. This goal is achieved by verifying that design specifications are met through the use of quality assurance (QA) practices. The in-situ density is regarded as one of the most important controls used to ensure that a pavement being placed is of high quality because it is a good indicator of future performance. In-situ density is frequently assessed utilizing one or more of the following three methods: cores, nuclear density gauge measurements or non-nuclear density gauge measurements. Each of the above mentioned methods, however, have their distinct disadvantages. Cores, for example, are generally considered to be the most accurate means of measuring in-situ density, however, they are a time consuming and destructive test that introduces a defect into asphalt pavements. Because of the destructive nature associated with coring, contractors and agencies have alternatively used non-destructive nuclear and non-nuclear density gauges for quality control purposes. These instruments allow for a more rapid assessment of the in-situ density, allowing measurements to be taken even during the pavement's construction. The disadvantage of these gauges are that they provide density readings only at discrete locations of the asphalt pavement mat, while no consensus exists among pavement researchers on the proper correlation between the gauges and core density. In recent years, numerous alternative methods have been introduced for the assessment of in-situ density, both during asphalt pavement construction and afterwards. These methods include, amongst others, intelligent compaction, thermal imaging and ground penetrating radar (GPR). Among these methods, GPR has been defined as both a technically feasible and promising method for the nondestructive, rapid, and continuous evaluation of in-situ asphalt pavement density based on

  10. APPLICATION OF LOW TEMPERATU RE PROPERTIES IMPROVEMENT ASPHALT TO REPAIRE WORK OF RO CK FILL DAM WITH ASPHALT FACING

    Science.gov (United States)

    Shimazaki, Masaru; Tsunoo, Takashi; Kasahara, Atsushi

    The low temperature properties improvement asphalt that is no decreasing the transformation follow and the stress relaxation properties at the low temperature was developed. It aimed at properties of PG64-28 (lowest temperature 28 degree C and maximum temperature 64 degree C that was able to be used) from PG (Performance Grade) of mix design method SUPERPAVE (Superior Performance Pavement) of new road-building plan SHRP (Strategic Highway Research Program) in the United States when developing. When the repair work of the rock fill dam with asphalt facing located in Kyogoku-cho Abuta-gun Hokkaido was planned, the applicability of the developed asphalt was verified. As for the verification outcome and the developed asphalt, it was proven that it was applied to the repair construction, and there was no problem in manufacturing and construction.

  11. Experimental investigation of basic oxygen furnace slag used as aggregate in asphalt mixture.

    Science.gov (United States)

    Xue, Yongjie; Wu, Shaopeng; Hou, Haobo; Zha, Jin

    2006-11-16

    Chinese researchers have commenced a great deal of researches on the development of application fields of basic oxygen steel making furnace slag (BOF slag) for many years. Lots of new applications and properties have been found, but few of them in asphalt mixture of road construction engineering. This paper discussed the feasibility of BOF steel slag used as aggregate in asphalt pavement by two points of view including BOF steel slag's physical and micro-properties as well as steel slag asphalt materials and pavement performances. For the former part, this paper mainly concerned the mechanochemistry and physical changes of the steel slag and studied it by performing XRD, SEM, TG and mercury porosimeter analysis and testing method. In the second part, this paper intended to use BOF steel slag as raw material, and design steel slag SMA mixture. By using traditional rutting test, soak wheel track and modified Lottman test, the high temperature stability and water resistance ability were tested. Single axes compression test and indirect tensile test were performed to evaluate the low temperature crack resistance performance and fatigue characteristic. Simultaneously, by observing steel slag SMA pavement which was paved successfully. A follow-up study to evaluate the performance of the experimental pavement confirmed that the experimental pavement was comparable with conventional asphalt pavement, even superior to the later in some aspects. All of above test results and analysis had only one main purpose that this paper validated the opinion that using BOF slag in asphalt concrete is feasible. So this paper suggested that treated and tested steel slag should be used in a more extensive range, especially in asphalt mixture paving projects in such an abundant steel slag resource region. PMID:16982138

  12. 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.

  13. Effectiveness of pavement-solar energy system – An experimental study

    International Nuclear Information System (INIS)

    Highlights: • We built a small-scale pilot project of pavement-solar energy utilization. • Design an automatic monitoring system to record the operating data. • The average heat absorptivity of pavement-solar energy is 37%. • The average thermal storage effectiveness of the system is 17%. - Abstract: A small-scale pilot project was built for the pavement-solar energy utilization in this paper. An automatic data acquisition system was designed to measure the effectiveness of the pavement solar energy system based on the operation data of 24 h a day in both summer and winter. Through 69 days (1656 h) of operation in summer, 2821 kW h of heat energy were stored in soil underground. In the transitional season, 4598 kW h of heat energy were taken out from soil during 104 days (2496 h) of operation in winter. The analysis showed that in summer, solar heat collection of asphalt pavement could effectively reduce 7 °C of its temperature. Under conditions of natural radiation, the average heat absorptivity of pavement was 37% and the average thermal storage effectiveness of the system was 17%. The electrical energy consumed by the system is only 11% of stored heat. During the winter, the asphalt pavement absorbs heat from underground soil which effectively increases its temperature, cutting 32% days of surface temperature below the freezing point. This not only save the energy for ice/snow removal but also mitigate associated safety risks

  14. Modeling of change in asphalt concrete dynamic modulus

    Directory of Open Access Journals (Sweden)

    A.M. Kirillov

    2015-03-01

    Full Text Available Historically, since the 1930s, deformation and power criteria were defined by methods of calculation of non-rigid road clothes (the deformation modulus, the California bearing ratio, the dynamic modulus. For almost a centenary history considerable statistical changes of the specified indicators in road layers were collected. However, the physical essence of these changes and their regularity still remain unknown. Over the last decade in the field of auto roads the use of energy criteria has been more universal in comparison with the strength and deformation. These criteria bear in itself a predictive function, allow not only estimating integrally and complexly the pavement functional condition, but also managing this state during operation. Despite this fact, in today’s regulatory documents one of the main characteristics of asphalt concrete is still the deformation indicator – dynamic modulus. At the same time, now there is no reliable approach that would make it possible to define change of dynamic modulus of asphalt concrete in operation, so this task is still urgent. Moreover, there are no accurate dependences of ratio change between static and dynamic modules of asphalt concrete during operation. Change of dynamic modulus as private indicator can be used at calculation of energy functions variation. In this paper the authors made an attempt to simulate changes of dynamic modulus of asphalt concrete when loading and analyzed the suggested viscoelastic model. New results, in particular analytical dependences, can form the basis of new regulatory documents for asphalt concrete pavement construction.

  15. Influence of mixture composition on the noise and frictional characteristics of flexible pavements

    Science.gov (United States)

    Kowalski, Karol J.

    Both traffic noise and wet pavement-tire friction are mainly affected by the tire/pavement interaction. Existing laboratory test methods allow for evaluation of polishing resistance of the aggregates only. Currently, there is no generally accepted standardized laboratory test method to address noise related issues and the overall frictional properties of pavements (including macrotexture). In this research, which included both laboratory and field components, friction and noise properties of the flexible (asphalt) pavements were investigated. As a part of this study, a laboratory device to polish asphalt specimens was developed and the procedure to evaluate mixture frictional properties was proposed. Following this procedure, forty-six different Superpave mixtures (each utilizing a different aggregate blends), one stone matrix asphalt (SMA) mixture and one porous friction course (PFC) mixture were tested. Six of the above mixes (four Superpave mixtures, SMA mixture and PFC mixture) were selected for laboratory noise testing. This testing was performed using a one-of-a-kind tester called the Tire/Pavement Test Apparatus (TPTA). In addition, the field sections constructed using Superpave, SMA and PFC mixtures were also periodically tested for friction and noise. Field measurements included testing of total of 23 different asphalt and two concrete pavements. The field friction testing was performed using both portable CTM and DFT devices and the (ASTM E 274) locked wheel friction trailer. The laboratory friction testing was performed using CTM and DFT devices only. The results of both field and laboratory friction measurements were used to develop an International Friction Index (IFI)-based frictional requirement for laboratory friction measurements. The results collected in the course of the study indicate that the IFI-based flag values could be successfully used in place of SN-based flag values to characterize frictional characteristics of pavements.

  16. 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.

  17. Aging Influence on Fatigue Characteristics of RAC Mixtures Containing Warm Asphalt Additives

    OpenAIRE

    Feipeng Xiao; Wenbin Zhao; Serji N. Amirkhanian

    2010-01-01

    Aging is an important factor to affect the long-term performance of asphalt pavement. The fatigue life of a typical warm mix asphalt (WMA) is generally related to various factors of rheological and mechanical properties of the mixture. The study of the fatigue behavior of the specific rubberized WMA is helpful in recycling the scrap tires and saving energy in terms of the conventional laboratory aging process. This study explores the utilization of the conventional fatigue analysis approach i...

  18. Caltrans use of scrap tires in asphalt rubber products: a comprehensive review

    OpenAIRE

    Haiping Zhou; Sri Holikatti; Peter Vacura

    2014-01-01

    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 in...

  19. Influence of Subgrade and Unbound Granular Layers Stiffness on Fatigue Life of Hot Mix Asphalts - HMA

    OpenAIRE

    Hugo A. Rondón-Quintana; Wilmar D. Fernández-Gómez; Jesús A. Hernández-Noguera

    2013-01-01

    The mainly factors studied to predict fatigue life of hot mix asphalt-HMA in flexible pavements are the loading effect, type of test, compaction methods, design parameters of HMA (e.g., particle size and size distribution curve, fine content, type of bitumen) and the variables associated with the environment (mainly moisture, temperature, aging). This study evaluated through a computer simulation, the influence of the granular layers and subgrade on the fatigue life of asphalt layers in flexi...

  20. 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.

  1. 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

    2016-03-01

    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.

  2. The Application of Asphalt Cold Recycling Technology in Lower Yellow River Flood Control Project

    OpenAIRE

    Zhao Yu Kun; Li Qing An

    2016-01-01

    Asphalt cold recycling technology has many advantages, such as rapid construction, energy saving, and environmental protection. In this article, the works based on the flood control dike road repair of lower Yellow River flood control project and cold asphalt recycling technology. Combined with the current flood control dike road in Liaocheng, the old pavement rehabilitation program was designed and the program was successfully implemented. It provided a successful reference cases for applica...

  3. 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.

  4. 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. PMID:20855160

  5. A review of the fundamentals of polymer-modified asphalts: Asphalt/polymer interactions and principles of compatibility.

    Science.gov (United States)

    Polacco, Giovanni; Filippi, Sara; Merusi, Filippo; Stastna, George

    2015-10-01

    During the last decades, the number of vehicles per citizen as well as the traffic speed and load has dramatically increased. This sudden and somehow unplanned overloading has strongly shortened the life of pavements and increased its cost of maintenance and risks to users. In order to limit the deterioration of road networks, it is necessary to improve the quality and performance of pavements, which was achieved through the addition of a polymer to the bituminous binder. Since their introduction, polymer-modified asphalts have gained in importance during the second half of the twentieth century, and they now play a fundamental role in the field of road paving. With high-temperature and high-shear mixing with asphalt, the polymer incorporates asphalt molecules, thereby forming a swallowed network that involves the entire binder and results in a significant improvement of the viscoelastic properties in comparison with those of the unmodified binder. Such a process encounters the well-known difficulties related to the poor solubility of polymers, which limits the number of macromolecules able to not only form such a structure but also maintain it during high-temperature storage in static conditions, which may be necessary before laying the binder. Therefore, polymer-modified asphalts have been the subject of numerous studies aimed to understand and optimize their structure and storage stability, which gradually attracted polymer scientists into this field that was initially explored by civil engineers. The analytical techniques of polymer science have been applied to polymer-modified asphalts, which resulted in a good understanding of their internal structure. Nevertheless, the complexity and variability of asphalt composition rendered it nearly impossible to generalize the results and univocally predict the properties of a given polymer/asphalt pair. The aim of this paper is to review these aspects of polymer-modified asphalts. Together with a brief description of

  6. 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...

  7. Modeling of energy dissipation processes in a pavement – vehicle system

    Directory of Open Access Journals (Sweden)

    A.M. Kirillov

    2015-09-01

    Full Text Available The law of conservation of energy for a ‘pavement – vehicle’ system manifests itself primarily in the fact that for any temperature and operating conditions of a road asphalt concrete pavement the potential energy of gravity and the kinetic energy of a vehicle are partially transformed upon contact with the road pavement into elastic deformation energy or thermal energy, while a part of the energy dissipates. These types of energy are to some extent transformed into the internal energy of the road pavement, altering its energy balance and causing destructive processes. The initial level of the internal pavement energy changes while the road is used, on the one hand, through regular contributions from vehicles and from solar raditation, and, on the other hand, from compensating for viscoelastic deformation. Understanding these changes will allow to develop new and more efficient methods for monitoring the pavement condition, as well as a scientifically valid system of scheduling the repairs. In this article, we have assessed the level and the significance of the contribution of the work done by the moving vehicles over the pavement, and of the thermal radiation to the internal pavement energy gain. We have constructed a physical and mathematical model of energy dissipation and storage in the ‘pavement – vehicle’ system accounting for viscoelastic deformation and thermal radiation. We have designed an algorithm allowing to determine a scientifically based repair interval for asphalt concrete pavement. It is shown that the maximum plasticity for some ranges of speeds and transport weights may serve as a criterion of the recommended operating conditions of the road.

  8. The effect of Cryogenic Crumb Rubber in cold recycled mixes for road pavements

    DEFF Research Database (Denmark)

    Pettinari, Matteo; Dondi, Giulio; Sangiorgi, Cesare; Hededal, Ole

    2014-01-01

    Asphalt Pavement cold mixes for road bases, bound with bitumen emulsion and cement. The crumb rubber is produced cryogenically with granulometric selection, which together with the bitumen, the cement and the fine fractions of the mix forms a resilient mastic capable of imparting significant fatigue...

  9. 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.

  10. 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

  11. 基于土工合成材料加铺层的沥青混凝土路面抗裂性能%Crack Resistance of Geosynthetics Overlay Based Asphalt Concrete Pavement

    Institute of Scientific and Technical Information of China (English)

    孙雅珍; 刘杰民; 赵复笑

    2012-01-01

    应用数值计算的方法和冲击韧性试验研究在行车载荷作用下土工合成材料加铺层对含反射裂缝沥青混凝土路面的抗裂效果,并对土工合成材料弹性模量进行了优化设计.分析了温度、时间和加铺层弹性模量对裂缝延长线上各点正应力和面层层底拉应力的影响;应用冲击韧性试验系统评价了土工合成材料加铺层的抗裂效果.数值计算与冲击韧性试验结果基本一致.研究结果表明:铺设土工合成材料是防治反射裂缝的有效途径,能有效地改变结构的应力分布,更大程度地减少了应力集中;同时确定最佳的土工布加铺层的弹性模量为1 000 MPa;但加铺层对含裂缝沥青混凝土路面的路表弯沉基本没有影响.%The effect of geosynthetics overlay on retarding propagation of reflective cracks in AC pavement under vehicle load was studied by numerical calculation and impact toughness test, and the modulus of geosynthetics overlay was optimized. The effects of temperature, time and elastic modulus of the geosynthetics overlay on the tensile stress at the bottom of surface course and the normal stresses on the line of extensional crack-tip were analyzed. The impact toughness test was conducted to evaluate the effectiveness of the crack resistance of the geosynthetics overlay. The numerical calculation result was consistency with the test result. The results show that (1) geosynthetics overlay is effective for reflective crack resistance, it could obviously decrease stress concentration and change stress distribution; (2 ) the elastic modulus of the optimum geosynthetics overlay is 1 000 Mpa; (3) the geosynthetics overlay basically has no effect on the vertical deflection of the road surface.

  12. New experimental methods to monitor and characterize asphalt rubber binders

    OpenAIRE

    Peralta, J.; Silva, Hugo Manuel Ribeiro Dias da; Pais, Jorge C.

    2010-01-01

    The need for continuous quality improvement of the road pavements, leads to the development of new binders, such as asphalt rubber (AR). AR is produced by the digestion of crumb rubber from used tires on bitumen. The resulting AR is a heterogeneous material with high viscosity. The study of this product during its production is essential due to the sudden and sharp increase in the volume of AR in this phase. Knowledge of the extent of this phenomenon has obvious implications in...

  13. 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.

  14. The Application of Asphalt Cold Recycling Technology in Lower Yellow River Flood Control Project

    Directory of Open Access Journals (Sweden)

    Zhao Yu Kun

    2016-01-01

    Full Text Available Asphalt cold recycling technology has many advantages, such as rapid construction, energy saving, and environmental protection. In this article, the works based on the flood control dike road repair of lower Yellow River flood control project and cold asphalt recycling technology. Combined with the current flood control dike road in Liaocheng, the old pavement rehabilitation program was designed and the program was successfully implemented. It provided a successful reference cases for application of asphalt cold recycling technology for flood control dike road repair in the lower Yellow River flood control project.

  15. 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.

  16. 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.

  17. 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。

  18. 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.

  19. 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.

  20. 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.

  1. Greenhouse gas emissions of alternative pavement designs: framework development and illustrative application.

    Science.gov (United States)

    Liu, Xiaoyu; Cui, Qingbin; Schwartz, Charles

    2014-01-01

    Pavement rehabilitation is carbon intensive and the choice of pavement type is a critical factor in controlling greenhouse gas (GHG) emissions. The existing body of knowledge is not able to support decision-making on pavement choice due to a lack of consensus on the system boundaries, the functional units and the estimation periods. Excessive data requirements further inhibit the generalization of the existing methodologies for design evaluation at the early planning stage. This study proposes a practical life-cycle GHG estimation approach, which is arguably effective to benchmark pavement emissions given project bid tabulation. A set of case studies conducted for this study suggest that recycled asphalt pavement (e.g., foam stabilized base (FSB), and warm mix asphalt (WMA)) would prevent up to 50% of GHGs from the initial construction phase. However, from a life-cycle perspective, pavement emissions are dictated largely by the traffic characteristics and the analysis period for the use phase. The benefits from using recycled materials (e.g., FSB) are likely to diminish if the recycled products do not perform as well as those properly proportioned with less recycled materials, or if the recycled materials are locally unavailable. When the AADT reaches 10,000, use phase releases more than 97% of the life cycle emissions and the emissions difference among alternative designs will be within 1%. PMID:24333742

  2. 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.

  3. Mechanical behavior of flexible pavements undergoing thermal gradients - doi: 10.4025/actascitechnol.v33i3.10848

    Directory of Open Access Journals (Sweden)

    Grazielli Vassoler

    2011-07-01

    Full Text Available The proper structural understanding of a pavement should consider, according to the pavement mechanics, the aspects related to the traffic load, the environment and material properties. When asphaltic materials are used, the stress/strain relationships and the dependencies of load-time and temperature are key parameters for understanding flexible pavement performance. In this study, we employed the finite elements method to calculate stress/strain in flexible pavements structures considering temperature variation. The input data includes material stiffness, which is function of temperature and changes with position and time. The pavement temperature is obtained through the heat transfer differential equation, applying the Laplace transform and its numerical inversion. The finite elements grid was generated by the software ANSYS® and imported by the software MATLAB®. In order to determine the stiffness of the first layer (asphalt concrete we used the average of four nodes, depending on the each node temperature. The result evidences the importance of thermal gradients for the pavement analysis, both for the fatigue cracking and the accumulation of plastic deformations. The use of unique modulus for asphalt concrete layer generates results far from reality.

  4. 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.

  5. Experiment Study on Crack Resistance Performance of Asphalt Pavement Stress-Absorbing Layer Based on Fracture Energy%基于断裂能的沥青路面应力吸收层抗裂性能试验研究

    Institute of Scientific and Technical Information of China (English)

    刘燕燕; 凌天清; 黄中文

    2012-01-01

    半刚性基层与沥青面层之间铺设应力吸收层是有效解决沥青路面反射裂缝方法之一.通过三点弯曲试验,对比分析SBR(Styrene Butadiene Rubber)改性乳化沥青碎石封层、纤维增强乳化沥青碎石封层、乳化沥青稀浆封层、橡胶沥青碎石封层、纤维橡胶沥青碎石封层等路面封层的复合断裂能、最大弯曲力与最大挠度.试验结果表明:复合断裂能最大的是纤维橡胶沥青碎石封层,其次依次是纤维增强乳化沥青碎石封层、乳化沥青稀浆封层、橡胶沥青碎石封层、SBR改性乳化沥青碎石封层.%Between the semi-rigid base and asphalt surface laying stress, absorbing layer is one effective solution to asphalt reflection cracks. Based on three-point bending test, maximum bending force and maximum deflection of SBR( styrene butadiene rubber) modified emulsion asphalt crushed stone seal , fiber reinforce modified emulsion asphalt crushed stone seal, emulsion asphalt slurry seal, rubber asphalt crushed stone seal and fiber rubber asphalt crushed stone seal were analyzed. It was found that fiber asphalt rubber crushed stone seal has the biggest composite fracture energy, then fiber reinforce modified emulsion asphalt crushed stone seal, emulsion asphalt slurry seal, asphalt rubber crushed stone seal, SBR modified e-mulsion asphalt crushed stone seal followed.

  6. State-of-art of asphalt surfacings on long-spanned orthotropic steel deck in China

    NARCIS (Netherlands)

    Chen, X.; Liu, X.; Qian, Z.; Lei, Z.

    2012-01-01

    Reliable and durable asphalt surfacing systems still remain to be desired for the long-spanned orthotropic steel bridges as the nationally and internationally reports on distresses in deck pavement. Based on ten-year research works, this paper has presented a brief review and discussion of the Chine

  7. 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.

  8. 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.

  9. Deformation Parameters and Fatigue of the Recycled Asphalt Mixtures

    Directory of Open Access Journals (Sweden)

    Šrámek Juraj

    2015-12-01

    Full Text Available 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 (ε6. The test equipment and software is used to evaluate fatigue and deformation characteristics.

  10. 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.

  11. 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)

  12. 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.

  13. An approach to the usage of polyethylene terephthalate (PET) waste as roadway pavement material

    Energy Technology Data Exchange (ETDEWEB)

    Gürü, Metin, E-mail: mguru@gazi.edu.tr [Gazi University, Eng. Fac., Chem. Eng. Depart., 06570 Maltepe-Ankara (Turkey); Çubuk, M. Kürşat; Arslan, Deniz; Farzanian, S. Ali [Gazi University, Eng. Fac., Civil Eng. Depart., 06570 Maltepe-Ankara (Turkey); Bilici, İbrahim [Hitit University, Eng. Fac., Chem. Eng. Depart., 19100 Çorum (Turkey)

    2014-08-30

    Graphical abstract: - Highlights: • We derived two novel additive materials from PET bottle waste: TLPP and VPP. • We used them to modify the base asphalt separately. • The additives improved both the asphalt and the asphalt mixture performance. • TLPP, VPP offer a beneficial way about disposal of ecologically hazardous PET waste. - Abstract: This study investigates an application area for Polyethylene Terephthalate (PET) bottle waste which has become an environmental problem in recent decades as being a considerable part of the total plastic waste bulk. Two novel additive materials, namely Thin Liquid Polyol PET (TLPP) and Viscous Polyol PET (VPP), were chemically derived from waste PET bottles and used to modify the base asphalt separately for this aim. The effects of TLPP and VPP on the asphalt and hot mix asphalt (HMA) mixture properties were detected through conventional tests (Penetration, Softening Point, Ductility, Marshall Stability, Nicholson Stripping) and Superpave methods (Rotational Viscosity, Dynamic Shear Rheometer (DSR), Bending Beam Rheometer (BBR)). Also, chemical structures were described by Scanning Electron Microscope (SEM) equipped with Energy Dispersive Spectrometer (EDS) and Fourier Transform Infrared (FTIR) techniques. Since TLPP and VPP were determined to improve the low temperature performance and fatigue resistance of the asphalt as well as the Marshall Stability and stripping resistance of the HMA mixtures based on the results of the applied tests, the usage of PET waste as an asphalt roadway pavement material offers an alternative and a beneficial way of disposal of this ecologically hazardous material.

  14. Experimental Investigations of Effect of Sulphur on Beach Sand–Fly Ash–Asphalt (S-F-A) Paving Mixes

    OpenAIRE

    Satyakumar, M.; Satheeshchandran, R.

    2013-01-01

    The main components of the flexible pavements are asphalt and aggregates. But in most of the places in India there is shortage of the good quality aggregates (especially coarse aggregates), at the same time beach sand is available in plenty in many regions. Due to relative abundance of beach sand, the studies on the utilities of the beach sand in paving mixes are worth taking up. But beach Sand-Asphalt mix alone is not suitable for pavement construction, because of its low stability and high ...

  15. 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...

  16. 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.

  17. Research on the Technology Applying Anti-Rutting Additive to Asphalt Mixture

    Science.gov (United States)

    Sun, Jie; Huang, Liming; Li, Chun

    High-temperature problems like rutting, displacement and upheaval are the most serious ones for bituminous pavement of urban roads. Especially, such problems at crossroads and fixed places where buses stop, for instance, BRT, affect service ability and life of roads largely. Application of anti-rutting asphalt mixture mainly aims at reducing strain and deformation generated by bituminous concrete under effect of vehicle load, decreasing remainders that cannot be recovered in deformation, improving the ability of bituminous pavement to resist deformation under high temperature and delaying generation of rutting. Anti-rutting asphalt mixture in this thesis refers to the asphalt mixture where anti-rutting additive is added by dry method and high-temperature stability is improved.

  18. The Comparison of Measured and Simulated Dynamic Responses of Vehicles Indicated by Road Pavement Unevenness

    Directory of Open Access Journals (Sweden)

    Decký Martin

    2015-05-01

    Full Text Available The article presents the comparison of measured and simulated dynamic responses of heavy vehicle which are indicated by road pavement unevenness. This unevenness was represented by speed control bumps, potholes and stochastic pavement unevenness. The objective simulations were realized through the medium Quarter- Car Simulation by means of application of simulated theory of dynamic systems. The reliability of used model was verificated with comparison of measured and simulated values of sprung mass T815 vehicle accelerations. In the article, there are presented courses of total vertical forces of Quarter-Car Simulation for the first, the second and the fourth classification degree of unevenness, which was considered through the world's respected parameter IRI (International Roughness Index. Obtained simulated dynamic effects of the vehicle on the pavement were used for modification of a relevant Slovak design method of asphalt pavements.

  19. Effects of Mineral Filler to Polymer Modified Bitumen Ratio on the Design Properties of Hot Mix Asphalt and its Performance

    OpenAIRE

    Imran Hafeez; MUMTAZ AHMED KAMAL

    2010-01-01

    Current development in the design of asphalt concrete especially in the upper layers of flexible pavements contains about acceptable proportion of mineral fillers passing 75?m (# 200) sieve, which contributes towards the mix cohesion, resistant to rutting and improves serviceability. Three filler to PMA (Polymer Modified Asphalt) ratios (i.e. 2.4, 3.4. and 4.4%) in Marshall Method of mix design were used in order to determine the optimum filler content at relatively low design ...

  20. 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.

  1. Analysis of pavement serviceability for the Aashto Design Method: The Chilean Case

    International Nuclear Information System (INIS)

    Serviceability is an indicator that represents the level of service a pavement provides to the users. This subjective opinion is closely related to objective aspects, which can be measured on the pavement's surface. This research aims specifically at relating serviceability results obtained by a 9-member evaluation panel, representing general public as closely as possible to parameters (particularly of roughness) measured within instruments on 30, 25 and 11 road sections of asphalt concrete, Portland cement concrete and asphalt overlay respectively. Results show that prediction of serviceability is quite accurate based on roughness evaluation, while also revealing that, by comparison to studies in more developed countries, Chileans are seemingly more tolerant, in that they assign a somewhat high rating to ride quality. Furthermore, visible distress does not have a significant influence on serviceability values for Chilean users. A ratio between International Roughness Index (IRI) and Serviceability, as defined by AASHTO, was developed and may be used in this design method. Results for the final pavement condition of urban pavements were obtained (IRI-asphalt final=5.9, IRI-concrete final=8.1). (author)

  2. 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...

  3. 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...

  4. Preliminary evaluation of the lifecycle costs and market barriers of reflective pavements; TOPICAL

    International Nuclear Information System (INIS)

    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

  5. 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

  6. Use of Ground Penetrating Radar at the FAA's National Airport Pavement Test Facility

    Science.gov (United States)

    Injun, Song

    2015-04-01

    The Federal Aviation Administration (FAA) in the United States has used a ground-coupled Ground Penetrating Radar (GPR) at the National Airport Pavement Test Facility (NAPTF) since 2005. One of the primary objectives of the testing at the facility is to provide full-scale pavement response and failure information for use in airplane landing gear design and configuration studies. During the traffic testing at the facility, a GSSI GPR system was used to develop new procedures for monitoring Hot Mix Asphalt (HMA) pavement density changes that is directly related to pavement failure. After reviewing current setups for data acquisition software and procedures for identifying different pavement layers, dielectric constant and pavement thickness were selected as dominant parameters controlling HMA properties provided by GPR. A new methodology showing HMA density changes in terms of dielectric constant variations, called dielectric sweep test, was developed and applied in full-scale pavement test. The dielectric constant changes were successfully monitored with increasing airplane traffic numbers. The changes were compared to pavement performance data (permanent deformation). The measured dielectric constants based on the known HMA thicknesses were also compared with computed dielectric constants using an equation from ASTM D4748-98 Standard Test Method for Determining the Thickness of Bound Pavement Layers Using Short-Pulse Radar. Six inches diameter cylindrical cores were taken after construction and traffic testing for the HMA layer bulk specific gravity. The measured bulk specific gravity was also compared to monitor HMA density changes caused by aircraft traffic conditions. Additionally this presentation will review the applications of the FAA's ground-coupled GPR on embedded rebar identification in concrete pavement, sewer pipes in soil, and gage identifications in 3D plots.

  7. 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.

  8. Investigation of the Permanent Deformation Characteristics of Overlaid Pavement Incorporating Stress Absorbing Membrane Interlayers

    Institute of Scientific and Technical Information of China (English)

    Olumide Moses Ogundipe[1; Nicholas H. Thom[2; Andrew C. Collop[3

    2014-01-01

    This study was carried out to evaluate the resistance of overlaid pavement incorporating stress absorbing membrane interlayers to permanent deformation. In this study, the permanent deformation of the interlayer mixtures was determined using the RLAT (repeated load axial text) carried out in the Nottingham Asphalt Tester. Also, a test pavement was constructed in the laboratory to assess the resistance to permanent deformation of overlaid pavement incorporating SAMIs (stress absorbing membrane interlayers). The test pavement was divided into two along the centre line. Each of the divisions has three sections--two having SAMIs and one without SAMIs. The pavement was instrumented and trafficked. Trafficking was stopped when the pavement was deemed to have failed. The results showed that the measured permanent deformation values of the control sections were less than the sections having SAMIs. The increased permanent deformation values indicate that the introduction of SAMIs causes more vertical/horizontal deformation of the pavement. It was also found that the permanent deformation values varied depending on the composition and thickness of the SAMIs.

  9. 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.

  10. 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.

  11. 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.

  12. 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.

  13. Research on Fiber Micro-Surfacing Mixture Design and Pavement Performance in Interchange’s Connections

    OpenAIRE

    Wu Zhaoyang

    2015-01-01

    In order to use the micro-surfacing which is the existing micro-surfacing technology guide that has some technical defects, the method to determine the optimal dosage of emulsified asphalt and best whetstone is not very reasonable, and it impedes the application and development of micro-surfacing technology to improve the performance of the pavement. In this paper, the “graphical method” is first used to determine the optimal dosage range of emulsified asphalt. Nowadays, a large number of exp...

  14. Analyzing the influence of manufacturing conditions of reclaimed asphalt concrete on the characteristics of the asphalt binder: development of a gradual binder extraction method

    Science.gov (United States)

    Navaro, J.; Bruneau, D.; Drouadaine, I.; Pouteau, B.; Colin, J.; Dony, A.

    2012-05-01

    When asphalt concrete is manufactured incorporating a high percentage (almost 70%) of reclaimed materials from the deconstruction of road surfaces under renovation, and when the corresponding production device is designed specifically to reduce the energy input need (lowering the production temperature), the resulting manufacturing process contributes to the protection of the environment and reduces production costs. However, to meet the quality requirements of the finished product, virgin materials of appropriate quality and quantity must also be added (mineral aggregates and new asphalt binder) and control systems set up to quantify and optimize the parameters involved (thus avoiding the guess work which still often prevails today). It was for this reason that a new experimental technique described here was devised, which will ultimately be used in asphalt concrete production plants. The technique involves lixiviating reclaimed asphalt concrete using a chlorinated solvent; the resulting solute is collected gradually, then the mixture of binders (virgin and reclaimed asphalt concrete) can be characterized and their mass fractions quantified using a combination of UV and IR spectrometry. With this experimental technique we were able to assess the extent to which the reclaimed asphalt pavement binder participates in the agglomeration and cohesion of the reclaimed asphalt concrete. This assessment was made in terms of the main parameters in the production process, temperature of the materials and mixing time.

  15. 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

    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。%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.

  16. Assessment of in-situ compaction degree of HMA pavement surface layers using GPR and novel dielectric properties-based algorithms

    Science.gov (United States)

    Georgiou, Panos; Loizos, Fokion

    2015-04-01

    Field compaction of asphalt pavements is ultimately conducted to achieve layer(s) with suitable mechanical stability. However, the achieved degree of compaction has a significant influence on the performance of asphalt pavements. Providing all desirable mixture design characteristics without adequate compaction could lead to premature permanent deformation, excessive aging, and moisture damage; these distresses reduce the useful life of asphalt pavements. Hence, proper construction of an asphalt pavement is necessary to develop a long lasting roadway that will help minimize future maintenance. This goal is achieved by verifying and confirming that design specifications, in this case density specifications are met through the use of Quality Assurance (QA) practices. With respect to in-situ compaction degree of hot mix asphalt (HMA) pavement surface layers, nearly all agencies specify either cored samples or nuclear/ non nuclear density gauges to provide density measurement of the constructed pavement. Typically, a small number of spot tests (with either cores or nuclear gauges) are run and a judgment about the density level of the entire roadway is made based on the results of this spot testing. Unfortunately, density measurement from a small number of spots may not be representative of the density of the pavement mat. Hence, full coverage evaluation of compaction quality of the pavement mat is needed. The Ground Penetrating Radar (GPR), as a Non Destructive Testing (NDT) technique, is an example of a non-intrusive technique that favors over the methods mentioned above for assessing compaction quality of asphalt pavements, since it allows measurement of all mat areas. Further, research studies in recent years have shown promising results with respect to its capability, coupled with the use of novel algorithms based on the dielectric properties of HMA, to predict the in-situ field density. In view of the above, field experimental surveys were conducted to assess the

  17. 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%.

  18. Recycling of petroleum contaminated soils in cold mix asphalt paving materials

    International Nuclear Information System (INIS)

    The purpose of the paper is to evaluate the hazardous characteristics of cold mix asphalt pavements containing both petroleum contaminated sands and clean sands. Research sponsored by the United States Environmental Protection Agency (USEPA), the Electric Power Research Institute (EPRI) and several state agencies has suggested that asphalt incorporation may be useful for treating petroleum contaminated soils and other wastes. However, the most often cited reservation about this technology is the potential for polynuclear aromatic hydrocarbon (PNAH) releases and hydrocarbon air emissions. In most cases these studies were based upon the use of hot batching technologies. Hydrocarbon emissions are also reduced because the mixing occurs at ambient temperatures avoiding the potential emissions from fuel combustion and volatilization of the lighter asphalt fractions. For this reason, cold mix asphalt incorporation is not subject to permitting by the South Coast Air Quality Management District in California

  19. 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

  20. 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.

    2016-05-01

    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.

  1. Pervious Pavement System Evaluation

    Science.gov (United States)

    Pervious pavement is a low impact development stormwater control. The Urban Watershed Management Branch of the U.S. Environmental Protection Agency in Edison, NJ, is evaluating concrete pavers as a popular implementation. The pollutant removal of a bench-scale permeable interlo...

  2. Investigation of mineral filler effects on the aging process of asphalt mastics

    Science.gov (United States)

    Moraes, Raquel

    Aging of asphalt binders is induced by chemical and/or physicochemical changes during production of pavement and throughout its service life. Although binder aging in pavement always occurs while binder is in contact with aggregates and mineral filler, in most laboratory aging studies, and in current specifications, asphalt binders are individually aged without accounting for aggregate induced interactions. Past research has had conflicting findings, attributing both mitigating and/or catalytic effects to the presence of mineral filler in asphalt binder with regards to oxidative aging. Thus, in the present study it was hypothesized that evaluation of asphalt oxidative aging without regard to interactive effect of the presence of mineral filler is inadequate as a specification tool. Effects of mineral fillers on oxidative aging of asphalt is investigated by means of accelerated aging of mastics (asphalt and fillers) in Pressure Aging Vessel (PAV). Testing matrix included aging evaluation of mastics containing different fillers content, mineralogy, and surface area. Results showed that low-temperature behavior of aged mastic can be modified by controlling filler concentration and type. Fillers acts as an agent adsorbing heavy fractions of asphalt binder, therefore reducing stiffness and changing glass-transition temperature. Also, during oxidative aging of asphalt binders and mastics, both diffusion and adsorption mechanisms play a role in the rate of aging of asphaltic material. A method to characterize the behavior of mastics with aging was also developed by monitoring the mastics |G*| aging index (ratio of complex modulus before and after aging). Gel Permeation Chromatography (GPC) testing results supported mentioned findings regarding |G*| changes, as the presence of mineral filler appears to decelerate the rate of production of larger molecular size oxidation products in the binder phase of mastics. Implication of the findings is that change in molecular size

  3. 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.

  4. Non-linear viscoelastic behavior of polymer modified asphalt (PMA) in the paving industry

    Energy Technology Data Exchange (ETDEWEB)

    Jorshari, K. [Calgary Univ., AB (Canada)

    2000-06-01

    A common practice in the past few years in asphalt technology has been the modification of asphalt binders, most often through the addition of macromolecular materials, like elastomers and plastomers. A wider performance range for the bound pavement materials is the objective behind the addition of polymers to bitumen. This method reduces the accumulation of permanent deformation (rutting), retards fatigue crack initiation and propagation, which in turn is useful in decreasing the life cycle costs of asphalt pavement. The extreme field temperatures experienced in Canada reinforce the use of this procedure. The author initiated a research project aimed at (1) the determination of dynamic mechanical properties of certain polymer modified asphalt used in the filed, (2) the analysis of experimental data acquired through periodic-dynamic true shear test and the characterization of viscoelastic properties at large deformations, and (3) to study the behaviour of different types of modified asphalt binders under the same reduced temperature. The author proceeded by using a sliding plate dynamic shear rheometer used for large amplitude oscillatory shear (LAOS) flow. The maximum pavement design temperature specified in Strategic Highway Research Program (SHRP) binder served as the basis for the temperature reduction, and the results compared with conventional asphalt property. The comparison involved Fourier analysis of the stress response to LAOS. A specific range of transducer was selected for this research. The results indicated that the stress response to oscillatory shear test at LAOS decreases with increasing temperature. Higher stress and mechanical modulus was obtained when the frequency was increased, relating it to the number of vehicles on the road. Raising the frequency by an average of 10 times increases the modulus by one order of magnitude. A higher stress response is a consequence of a higher percentage of polymers. The impact of reduced temperature and non

  5. Research on the key technologies of waste asphalt material recycling%废弃沥青材料的循环利用关键技术研究

    Institute of Scientific and Technical Information of China (English)

    杨林江

    2015-01-01

    通过了解国内外沥青路面再生技术的发展现状,剖析沥青路面老化、再生机理,提出了废旧沥青混合料循环利用的技术,研发出一套行之有效的沥青路面热再生技术,以适应当今形势下的沥青路面再生、资源循环利用和环境保护的需要,为建设资源节约型、环境友好型社会而努力。%By understanding the domestic and international development situations of as-phalt pavement recycling technology,and analyzing the mechanism of asphalt pavement aging and recycling,this essay proposed the technologies of recycling of waste asphalt mixtures. It al-so developed a set of effective technologies of hot recycling of asphalt pavement,to adapt to the needs of asphalt pavement recycling,resources circulating and environment protecting in the current situation,which in an effort to construct a resource-saving and environment-friend-ly society.

  6. 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.

  7. 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.

  8. Use of ground-penetrating radar for asphalt thickness determination

    Science.gov (United States)

    Choubane, Bouzid; Fernando, Emmanuel; Ross, Stephen C.; Dietrich, Bruce T.

    2003-07-01

    A computer program, called TERRA (Thickness Evaluation of Roads by RAdar) was recently developed for estimating pavement layer thicknesses from ground penetrating radar (GPR) data. This program incorporates decision criteria for automated detection of layer interfaces, computation of layer thicknesses and a segmentation algorithm for delineating segments based on layer thicknesses. The Florida Department of Transportation (FDOT) initiated the present field study for an initial assessment of TERRA. Radar and core data were collected from several flexible pavement sections of Florida's roadway system. These sites were selected to represent the present Florida in-place mixes (Superpave and Marshall mixtures) and different asphalt layer thicknesses, which varied from approximately 50 to 300 mm (2 to 12 in). Radar data were collected at both highway speeds and in stationary mode. This paper presents a description of the data collection effort as well as the subsequent analysis and findings.

  9. 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.

  10. 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...

  11. Dynamic Properties and Fatigue Life of Stone Mastic Asphalt Mixtures Reinforced with Waste Tyre Rubber

    OpenAIRE

    Nuha Salim Mashaan; Ali, Asim H.; Suhana Koting; Mohamed Rehan Karim

    2013-01-01

    Today, virgin polymer modified asphalt mixes are comparatively more expensive for road pavement. One way to reduce the expense of such construction and to make it more convenient is the application of inexpensive polymer, such as waste polymer. The primary aim of this study was to investigate the effect of adding waste tyre rubber (crumb rubber modifier (CRM)) on the stiffness and fatigue properties of stone mastic asphalt (SMA) mixtures. Various percentages of waste CRM with size of 0.60 mm ...

  12. Evaluation of an eastern shale oil residue as an asphalt additive

    Energy Technology Data Exchange (ETDEWEB)

    Thomas, K.P.; Harnsberger, P.M.

    1995-09-01

    An evaluation of eastern shale oil (ESO) residue as an asphalt additive to reduce oxidative age hardening and moisture susceptibility was conducted by Western Research Institute (WRI). The ESO residue, have a viscosity of 23.9 Pa{lg_bullet}s at 60{degree}C (140{degree}F), was blended with three different petroleum-derived asphalts, ASD-1, AAK-1, and AAM-1, which are known to be very susceptible to oxidative aging. Rheological and infrared analyses of the unaged and aged asphalts and the blends were then conducted to evaluate oxidative age hardening. In addition, the petroleum-derived asphalts and the blends were coated onto three different aggregates, Lithonia granite (RA), a low-absorption limestone (RD), and a siliceous Gulf Coast gravel (RL), and compacted into briquettes. Successive freeze-thaw cycling was then conducted to evaluate the moisture susceptibility of the prepared briquettes. The rheological analyses of the unaged petroleum-derived asphalts and their respective blends indicate that the samples satisfy the rutting requirement. However, the aging indexes for the rolling thin film oven (RTFO)-aged and RTFO/pressure aging vessel (PAV)-aged samples indicate that the blends are stiffer than the petroleum-derived asphalts. This means that when in service the blends will be more prone to pavement embrittlement and fatigue cracking than the petroleum-derived asphalts. Infrared analyses were also conducted on the three petroleum-derived asphalts and the blends before and after RTFO/PAV aging. In general, upon RTFO/PAV aging, the amounts of carbonyls and sulfoxides in the samples increase, indicating that the addition of the ESO residue does not mitigate the chemical aging (oxidation) of the petroleum-derived asphalts. This information correlates with the rheological data and the aging indexes that were calculated for the petroleum-derived asphalts and the blends.

  13. Development of test method for evaluating root resistance of pavement used for roof garden caused by thickening growth of root

    Energy Technology Data Exchange (ETDEWEB)

    Ishihara, Saori; Tanaka, Kyoji [Tokyo Institute of Technology, Tokyo, (Japan)

    2010-07-01

    The growth of roots of plants can damage roof garden components, such as pavements. This paper developed a test method for evaluating the resistance of pavement used in roof gardens to damage from a thickening growth of roots. The study assessed the behaviour of plant roots and evaluated the force of root growth subjected to hypertrophy. A system to measure the enlargement force of roots was designed and used for measurements over a period of 8 months on a cherry blossom of 21 years growth. The enlargement force was approximately 440 N/cm. A mechanical simulated root was designed and used to carry out experimental tests on asphalt pavements. The tests results demonstrated the viability of simulated root for evaluation of root resistances in pavements and various components of roof gardens.

  14. Asphalt chemical fractionation

    International Nuclear Information System (INIS)

    Asphalt fractionation were carried out in the Esmeraldas Oil Refinery using n-pentane, SiO2 and different mixture of benzene- methane. The fractions obtained were analyzed by Fourier's Transformed Infrared Spectrophotometry (FTIR)

  15. NON-LINEAR CALCULATION OF MULTILAYER AIRFIELD PAVEMENTS ACCORDING TO THE THEORY OF PLASTIC CURRENT

    Directory of Open Access Journals (Sweden)

    A.N.Popov

    2015-02-01

    Full Text Available Statement of the problem.Low fracture strength of asphalt, promoting formation of the reflected cracks in a strengthening layer interferes with strengthening of precast slab pavings PAG by as-phalt layers of strengthening. Constructive-technological decisions aimed at decreasing the re-flected crack formation in practice do not produce a due result because of the absence of a strict mathematical model of the operation of non-rigid layers of strengthening. Thus, for the purpose of the definition of the parameters of the design of strengthening operation of the mathematical model based on the research of change of an intense-deformed condition of a multilayer airfield pavement, exposed to impact of a static load from aircrafts is required.Results.Elastic and plastic model of the deformation of the multilayer airfield pavement is ob-tained based on mathematical assumptions of the theory of a current. Strength and plasticity crite-rion are proved accordingly for materials of the artificial airfield pavement, a natural earth founda-tion. The method for settlements of elastic and plastic model is suggested using the method of final elements.Conclusions.The obtained data can be used in the course of designing of layers of reinforcement of rigid airfield pavement from plates PAG.

  16. Microstructure - based continuum damage model for Asphalt mixes

    International Nuclear Information System (INIS)

    Full text.Hot mix asphalt (HMA) is a complex composite material that consists of different sizes of aggregates, asphalt binder and air voids. One of the most important failures in asphalt pavements is caused by permanent deformation under high service temperature. An HMA with high resistance to permanent deformation work-hardens under repeated loading with accumulating strain. However, HMA that is susceptible to permanenr deformation develop microcracks under repeated loading, which softens the mix and leads ao an increase in the rate of accumulated strain. Most of macroscopic response of HMA, assume isotropic material properties and do not account for the microscopic behavior. This study develops a viscoplastic constitutive model for asphalt mixtures that incorporates microstructure parameters. The model is based on Perzyna's elasto-viscoplastic theory. The viscous flow function is extended to reflect the microstructure anisotropy. In addition, a damage parameter is included in the model to reflect the initiation adn propagation of cracks. The model's parameters are obtained using image analysis procedures, static creep tests and strength tests. The model is used to describe the behavior of number of mixtures with known field performance

  17. 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

  18. Asphalt Mix Design and performance

    OpenAIRE

    Badaruddin, Shakor Ramat; White, Thomas D.

    1995-01-01

    Premature flexible pavement distress became a major concern in Indiana. As a result, a study was conducted investigating the major underlying factors. Pavement sections were investigated based on a factorial study with four factors comprised of climate, truck traffic, pavement base type, and wheel path. The distresses evaluated were rutting, thermal cracking and stripping. All were evaluated against control sections with zero distress. The pavement condition of each section was determin...

  19. Modified Asphalt Binder with Natural Zeolite for Warm Mix Asphalt

    OpenAIRE

    Dubravský Marián; Mandula Ján

    2015-01-01

    In recent years, warm mix asphalt (WMA) is becoming more and more used in the asphalt industry. WMA provide a whole range of benefits, whether economic, environmental and ecological. Lower energy consumption and less pollution is the most advantages of this asphalt mixture. The paper deals with the addition of natural zeolite into the sub base asphalt layers, which is the essential constituent in the construction of the road. Measurement is focused on basic physic – mechanical properties decl...

  20. 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.

  1. The use of reflective and permeable pavements as a potential practice for heat island mitigation and stormwater management

    International Nuclear Information System (INIS)

    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. (letter)

  2. Synthesis of Specimen Preparation and Curing Processes for Cold Recycled Asphalt Mixes

    OpenAIRE

    TEBALDI, Gabriele; DAVE, Eshan; Marsac, Paul; MURAYA, Patrick; HUGENER, Martin; Graziani, Andrea; Grilli, Andrea; MARRADI, Alessandro; Wendling, Louisette; Gaudefroy, Vincent; JENKINS, Kim; LOIZOS, Andreas; BOCCI, Maurizio

    2012-01-01

    The process of cold recycling (CR) is becoming method of choice for pavement rehabilitation due to significantly added environmental and economic benefits. Understanding and standardization of specimen preparation and curing processes are critical to replicate field conditions in lab. This paper presents an extensive synthesis of various specimen preparation and curing processes for cold recycled asphalt mixes. Topics synthesized include RAP, emulsion/bitumen and aggregate preparation, mixing...

  3. Laboratory test methods for polishing asphalt surfaces and predicting their skid resistance

    OpenAIRE

    Do, Minh Tan; Kane, Malal; Cerezo, Véronique

    2013-01-01

    In this paper, laboratory test methods reproducing phenomena affecting pavement skid resistance evolution are presented. Polishing tests are performed by Wehner/Schulze machine to simulate the polishing induced by traffic and the binder removal phase (typical for bituminous asphalt concrete). Accelerated aging tests are performed by a weatherometer, operating conditions being adjusted according to local weather conditions, to simulate the binder aging responsible for friction increase at earl...

  4. Influence of the bitumen properties on the functional and rheological behaviour of asphalt rubber binders

    OpenAIRE

    Peralta, J.; Silva, Hugo Manuel Ribeiro Dias da; Machado, A.V.; Pais, Jorge C.

    2009-01-01

    It is estimated that about ten kilograms of tires are discarded per inhabitant annually. The negative impact of this residue can be reduced since rubber can be reused as a constituent of asphalt rubber (AR) builder in road pavements. However, the materials which constitute the AR binders and their interaction are not sufficiently characterized, In this work several base bitumens interacted with crumb rubber in order to produce AR binders, which were subsequently separated, by using a modified...

  5. 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。

  6. Effect of Zn/Al Layered Double Hydroxide Containing 2-Hydroxy-4-n-octoxy-benzophenone on UV Aging Resistance of Asphalt

    OpenAIRE

    Chao Peng; Jianying Yu; Jing Dai; Jian Yin

    2015-01-01

    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 Z...

  7. 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.

  8. A model for predicting thermal properties of asphalt mixtures from their constituents

    Science.gov (United States)

    Keller, Merlin; Roche, Alexis; Lavielle, Marc

    Numerous theoretical and experimental approaches have been developed to predict the effective thermal conductivity of composite materials such as polymers, foams, epoxies, soils and concrete. None of such models have been applied to asphalt concrete. This study attempts to develop a model to predict the thermal conductivity of asphalt concrete from its constituents that will contribute to the asphalt industry by reducing costs and saving time on laboratory testing. The necessity to do the laboratory testing would be no longer required when a mix for the pavement is created with desired thermal properties at the design stage by selecting correct constituents. This thesis investigated six existing predictive models for applicability to asphalt mixtures, and four standard mathematical techniques were used to develop a regression model to predict the effective thermal conductivity. The effective thermal conductivities of 81 asphalt specimens were used as the response variables, and the thermal conductivities and volume fractions of their constituents were used as the predictors. The conducted statistical analyses showed that the measured values of thermal conductivities of the mixtures are affected by the bitumen and aggregate content, but not by the air content. Contrarily, the predicted data for some investigated models are highly sensitive to air voids, but not to bitumen and/or aggregate content. Additionally, the comparison of the experimental with analytical data showed that none of the existing models gave satisfactory results; on the other hand, two regression models (Exponential 1* and Linear 3*) are promising for asphalt concrete.

  9. Experimental investigation of the fatigue behaviour of asphalt concrete mixtures containing waste iron powder

    International Nuclear Information System (INIS)

    Research highlights: → This paper presents the first model of the fatigue behaviour of iron-asphalt mixtures in the world. → This model is able to describe the fatigue behaviour of iron-asphalt under dynamic loading. → Coarse surface, high stiffness and angularity of iron powder lead to enhanced fatigue performance. → The model illustrates that the use of iron powder has a considerable effect on tensile strain of HMA. → The use of this type of waste material could be a helpful solution for less polluted environment. - Abstract: The use of additives and admixtures in the construction of asphalt concrete pavements to strengthen them against dynamic loads has increased considerably in recent years. Recent research has shown that employing desirable waste materials in hot mix asphalts (HMAs) improves their dynamic properties noticeably. The study of some special cases, such as the addition of blast furnace slag and metallic materials of waste electronic instruments to HMA, has led to a considerable increase in the ability of HMAs to tolerate fatigue phenomena and repeated loading. Based on experimental studies, a model is proposed to describe the fatigue behaviour of asphalt mixtures containing waste iron powder. The results of this research show an important increase in the strength of asphalt mixtures containing waste iron powder against fatigue phenomena in comparison to conventional HMAs.

  10. 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.

  11. Rutting mechanisms and advanced laboratory testing of asphalt mixtures resistance against permanent deformation

    Directory of Open Access Journals (Sweden)

    Miljković Miomir

    2011-01-01

    Full Text Available Permanent deformation in asphalt layers which manifestation on pavement surface is named rutting represents one of the most significant distresses of asphalt pavements. Depending on the level, it can be a huge inconvenience for traffic safety, driving comfort, and overall pavement life-cycle. Rutting may be classified into three basic types: one-dimensional or vertical compaction, lateral flow or plastic movement, and mechanical deformation. As an addition to Superpave® mixture volumetric design three, so called, simple performance tests (SPT were recommended. Each of these tests in conduced in uniaxial or triaxial compression of cylindrical specimens. They cover the determination of dynamic modulus, repeated load permanent deformation test (flow number, and static load permanent deformation test (flow time. These tests provide relatively good insight in on-site mixture performance. An application of these tests provides a potential link between mixture design and structural analysis that was an underlying goal of substantial amount of earlier flexible pavement researches.

  12. 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.

  13. PAHs underfoot: contaminated dust from coal-tar sealcoated pavement is widespread in the United States.

    Science.gov (United States)

    Van Metre, Peter C; Mahler, Barbara J; Wilson, Jennifer T

    2009-01-01

    We reported in 2005 that runoff from parking lots treated with coal-tar-based sealcoat was a major source of polycyclic aromatic hydrocarbons (PAHs) to streams in Austin, Texas. Here we present new data from nine U.S. cities that show nationwide patterns in concentrations of PAHs associated with sealcoat. Dust was swept from parking lots in six cities in the central and eastern U.S., where coal-tar-based sealcoat dominates use, and three cities in the western U.S., where asphalt-based sealcoat dominates use. For six central and eastern cities, median SigmaPAH concentrations in dust from sealcoated and unsealcoated pavement are 2200 and 27 mg/kg, respectively. For three western cities, median SigmaPAH concentrations in dust from sealcoated and unsealcoated pavement are similar and very low (2.1 and 0.8 mg/kg, respectively). Lakes in the central and eastern cities where pavement was sampled have bottom sediments with higher PAH concentrations than do those in the western cities relative to degree of urbanization. Bottom-sediment PAH assemblages are similar to those of sealcoated pavement dust regionally, implicating coal-tar-based sealcoat as a PAH source to the central and eastern lakes. Concentrations of benzo[a]pyrene in dustfrom coal-tarsealcoated pavement and adjacent soils greatly exceed generic soil screening levels, suggesting that research on human-health risk is warranted. PMID:19209579

  14. PAHs underfoot: contaminated dust from coal-tar sealcoated pavement is widespread in the United States

    Energy Technology Data Exchange (ETDEWEB)

    Peter C. Van Metre; Barbara J. Mahler; Jennifer T. Wilson [U.S. Geological Survey, Austin, TX (USA)

    2009-01-15

    We reported in 2005 that runoff from parking lots treated with coal-tar-based sealcoat was a major source of polycyclic aromatic hydrocarbons (PAHs) to streams in Austin, Texas. Here we present new data from nine U.S. cities that show nationwide patterns in concentrations of {Sigma}PAHs associated with sealcoat. Dust was swept from parking lots in six cities in the central and eastern U.S., where coal-tar-based sealcoat dominates use, and three cities in the western U.S., where asphalt-based sealcoat dominates use. For six central and eastern cities, median SPAH concentrations in dust from sealcoated and unsealcoated pavement are 2200 and 27 mg/kg, respectively. For three western cities, median SPAH concentrations in dust from sealcoated and unsealcoated pavement are similar and very low (2.1 and 0.8 mg/kg, respectively). Lakes in the central and eastern cities where pavement was sampled have bottom sediments with higher PAH concentrations than do those in the western cities relative to degree of urbanization. Bottom-sediment PAH assemblages are similar to those of sealcoated pavement dust regionally, implicating coal-tar-based sealcoat as a PAH source to the central and eastern lakes. Concentrations of benzo(a)pyrene in dust from coal-tar sealcoated pavement and adjacent soils greatly exceed generic soil screening levels, suggesting that research on human-health risk is warranted. 30 refs., 4 figs., 2 tabs.

  15. 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.

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

    Directory of Open Access Journals (Sweden)

    D. I. Chernousov

    2011-11-01

    Full Text Available 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 modulus of elasticity and tensile bending strength. To forecast operating properties ofasphalt concrete, 4×4×16 cm beams were tested on vibrostand УВ 70/100, which enables one toobtain frequency and amplitude of oscillations continuously adjustable during operation. The techniqueuses analytical relationships which allow one to determine durability of operating period undersimulation of axis load of 6 and 10 tons. Comparison of the relationships obtained shows thatmodulus of elasticity, bending and comparison strength of involved asphalt concrete mixes markedlydecrease. However, this decrease is more pronounced with reference asphalt concretes.Conclusions. The use of shungite mineral powder provides for increasing fatigue life of asphaltconcrete, which can be related to higher adhesion activity of shungite powder compared with limestonepowder.

  17. Addition of an industrial residue to asphalt: evaluation of material properties

    Energy Technology Data Exchange (ETDEWEB)

    Dantas, T.N. Castro; Lima, C.K.M.; Moura, M.C.P.A.; Dantas Neto, A.A.; Felix, G.B. [Universidade Federal do Rio Grande do Norte (UFRN), Natal, RN (Brazil). Dept. de Engenharia Quimica], e-mail: carlenise@eq.ufrn.br

    2010-10-15

    Polymer waste from a button manufacturer was blended with 50/60 penetration-grade petroleum asphalt cement with the purpose of enhancing its physical properties and to obtain pavements which are more resistant to temperature gradients and permanent deformation. This polymer waste is considered as an environmental problem because it is produced in large scale and stored in sanitary landfills. First, the polymer waste was classified as unsaturated polyester. Then, the waste was blended with asphalt according to the following experimental conditions: polymer content: 2.0, 7.0, or 14.0 wt.%; mixing temperature: 140 or 180 deg C; and mixing time: 20 or 60 min. The results obtained in penetration index, ring-and-ball softening point, flash point, and viscosity assays showed that the addition of polymer waste as an insoluble material to asphalt is a viable alternative to solve this environmental problem. (author)

  18. 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.

  19. An approach to the usage of polyethylene terephthalate (PET) waste as roadway pavement material.

    Science.gov (United States)

    Gürü, Metin; Çubuk, M Kürşat; Arslan, Deniz; Farzanian, S Ali; Bilici, İbrahim

    2014-08-30

    This study investigates an application area for Polyethylene Terephthalate (PET) bottle waste which has become an environmental problem in recent decades as being a considerable part of the total plastic waste bulk. Two novel additive materials, namely Thin Liquid Polyol PET (TLPP) and Viscous Polyol PET (VPP), were chemically derived from waste PET bottles and used to modify the base asphalt separately for this aim. The effects of TLPP and VPP on the asphalt and hot mix asphalt (HMA) mixture properties were detected through conventional tests (Penetration, Softening Point, Ductility, Marshall Stability, Nicholson Stripping) and Superpave methods (Rotational Viscosity, Dynamic Shear Rheometer (DSR), Bending Beam Rheometer (BBR)). Also, chemical structures were described by Scanning Electron Microscope (SEM) equipped with Energy Dispersive Spectrometer (EDS) and Fourier Transform Infrared (FTIR) techniques. Since TLPP and VPP were determined to improve the low temperature performance and fatigue resistance of the asphalt as well as the Marshall Stability and stripping resistance of the HMA mixtures based on the results of the applied tests, the usage of PET waste as an asphalt roadway pavement material offers an alternative and a beneficial way of disposal of this ecologically hazardous material. PMID:25080154

  20. 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.

    2016-04-01

    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. In this paper, a four level multiscale computational micromechanics methodology is utilized to determine the accuracy of micromechanics versus directly measured viscoelastic properties of asphalt concrete pavement. This is accomplished by first measuring the viscoelastic dynamic modulus of asphalt binder, as well as the elastic properties of the constituents, and this comprised the first scale analysis. In the second scale analysis, the finite element method is utilized to predict the effect of mineral fillers on the dynamic modulus. In the third scale analysis, the finite element method is again utilized to predict the effect of fine aggregates on the dynamic modulus. In the fourth and final scale analysis, the finite element method is utilized to predict the effect of large aggregates on the dynamic modulus of asphalt concrete. This final predicted result is then compared to the experimentally measured dynamic modulus of two different asphalt concretes for various volume fractions of the constituents. Results reveal that the errors in predictions are on the order of 60 %, while the ranking of the mixtures was consistent with experimental results. It should be noted that differences between the "final predicted results" and the experimental results can provide fruitful ground for understanding the effect of interactions not considered in the multiscale approach, most importantly, chemical interactions.

  1. A Multiscale Virtual Fabrication and Lattice Modeling Approach for the Fatigue Performance Prediction of Asphalt Concrete

    Science.gov (United States)

    Dehghan Banadaki, Arash

    Predicting the ultimate performance of asphalt concrete under realistic loading conditions is the main key to developing better-performing materials, designing long-lasting pavements, and performing reliable lifecycle analysis for pavements. The fatigue performance of asphalt concrete depends on the mechanical properties of the constituent materials, namely asphalt binder and aggregate. This dependent link between performance and mechanical properties is extremely complex, and experimental techniques often are used to try to characterize the performance of hot mix asphalt. However, given the seemingly uncountable number of mixture designs and loading conditions, it is simply not economical to try to understand and characterize the material behavior solely by experimentation. It is well known that analytical and computational modeling methods can be combined with experimental techniques to reduce the costs associated with understanding and characterizing the mechanical behavior of the constituent materials. This study aims to develop a multiscale micromechanical lattice-based model to predict cracking in asphalt concrete using component material properties. The proposed algorithm, while capturing different phenomena for different scales, also minimizes the need for laboratory experiments. The developed methodology builds on a previously developed lattice model and the viscoelastic continuum damage model to link the component material properties to the mixture fatigue performance. The resulting lattice model is applied to predict the dynamic modulus mastercurves for different scales. A framework for capturing the so-called structuralization effects is introduced that significantly improves the accuracy of the modulus prediction. Furthermore, air voids are added to the model to help capture this important micromechanical feature that affects the fatigue performance of asphalt concrete as well as the modulus value. The effects of rate dependency are captured by

  2. 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.

  3. Effects of Mineral Filler to Polymer Modified Bitumen Ratio on the Design Properties of Hot Mix Asphalt and its Performance

    Directory of Open Access Journals (Sweden)

    Imran Hafeez

    2010-10-01

    Full Text Available Current development in the design of asphalt concrete especially in the upper layers of flexible pavements contains about acceptable proportion of mineral fillers passing 75?m (# 200 sieve, which contributes towards the mix cohesion, resistant to rutting and improves serviceability. Three filler to PMA (Polymer Modified Asphalt ratios (i.e. 2.4, 3.4. and 4.4% in Marshall Method of mix design were used in order to determine the optimum filler content at relatively low design asphalt contents (3.83%, for asphalt concrete having PMA and 100% lime stone dust. Designed mix was laid on Southbound Turnol Taxila National Highway Section (N-5, Pakistan as a trial in year 2003. The study reveals that filler to asphalt ratio affects the mix properties to a greater extent and mix laid at site have shown relatively better performance during its service life of initial four critical years. For coarse graded mixes with low asphalt contents, designed especially for heavy loading and high temperatures regions like Pakistan, filler to asphalt ratio less than equal to 1.0 yields better results.

  4. Pavement management using hyperspectral imagery

    Science.gov (United States)

    Ayalew, Balehager; Gomez, Richard B.; Roper, William E.; Carrasco, Oscar

    2003-08-01

    Public Works facilities require up-to-date information on the health status of the road network they maintain. However, roadway maintenance and rehabilitation involves the greatest portion of a municipality's annual operating budget. Government officials use various technologies such as a pavement management system to assist in making better decisions about their roadways systems, pavement condition, history, and projects. Traditionally, manual surveying has served as the method of obtaining this information. To better assist in decision-making, a regionally specific spectral library for urban areas is being developed and used in conjunction with hyperspecrtal imaging, to map urban materials and pavement conditions. A Geographical Information and Positioning System (GIS/GPS) will also be implemented to overlay relative locations. This paper will examine the benefits of using hyperspectral imaging over traditional methods of roadway maintenance and rehabilitation for pavement management applications. In doing so, we will identify spatial and spectral requirements for successful large-scale road feature extraction.

  5. Pervious Pavement System Evaluation- Abstract

    Science.gov (United States)

    Porous pavement is a low impact development stormwater control. The Urban Watershed Management Branch is evaluating interlocking concrete pavers as a popular implementation. The pavers themselves are impermeable, but the spaces between the pavers are backfilled with washed, gra...

  6. Fast simulated annealing inversion of surface waves on pavement using phase-velocity spectra

    Science.gov (United States)

    Ryden, N.; Park, C.B.

    2006-01-01

    The conventional inversion of surface waves depends on modal identification of measured dispersion curves, which can be ambiguous. It is possible to avoid mode-number identification and extraction by inverting the complete phase-velocity spectrum obtained from a multichannel record. We use the fast simulated annealing (FSA) global search algorithm to minimize the difference between the measured phase-velocity spectrum and that calculated from a theoretical layer model, including the field setup geometry. Results show that this algorithm can help one avoid getting trapped in local minima while searching for the best-matching layer model. The entire procedure is demonstrated on synthetic and field data for asphalt pavement. The viscoelastic properties of the top asphalt layer are taken into account, and the inverted asphalt stiffness as a function of frequency compares well with laboratory tests on core samples. The thickness and shear-wave velocity of the deeper embedded layers are resolved within 10% deviation from those values measured separately during pavement construction. The proposed method may be equally applicable to normal soil site investigation and in the field of ultrasonic testing of materials. ?? 2006 Society of Exploration Geophysicists.

  7. Research on Fiber Micro-Surfacing Mixture Design and Pavement Performance in Interchange’s Connections

    Directory of Open Access Journals (Sweden)

    Wu Zhaoyang

    2015-01-01

    Full Text Available In order to use the micro-surfacing which is the existing micro-surfacing technology guide that has some technical defects, the method to determine the optimal dosage of emulsified asphalt and best whetstone is not very reasonable, and it impedes the application and development of micro-surfacing technology to improve the performance of the pavement. In this paper, the “graphical method” is first used to determine the optimal dosage range of emulsified asphalt. Nowadays, a large number of expressways reach the stage of repair and maintenance. Interchange ramp exit and entrance are always the accident-prone sections and, it’s easy to over-look the pavement’s skid resistance of those areas. Micro-surfacing can significantly improve the performance of pavement, especially the skid resistance. Verified with laboratory tests, it recommends that the dosage of emulsified asphalt corresponding to the peak of flexural strain measured with low temperature bending test as OAC of micro-surfacing mixture shows technical superiority. The use of fiber micro-surfacing at the ramp’s exit and entrance can reduce the braking distance.

  8. Analysis of asphalt mixtures on town roads

    OpenAIRE

    Glavica, Primož

    2006-01-01

    Asphalt mixtures are most commonly used composite for construction of top layers of different drive ways. By definition asphalt mixtures are composed of crushed rock, fill, bitumen and additives. Percentage of individual components wary according to the purpose asphalt mixture is to be used for. Asphalt mixtures must be capable of enduring different types of load. According to the type of load asphalt mixtures are divided into asphalt mixtures used for supporting layers and asp...

  9. Evaluation of Thermal Oxidative Aging Effect on the Rheological Performance of Modified Asphalt Binders

    Science.gov (United States)

    Zhu, Cheng

    Modified asphalt binder, which is combined by base binder and additive modifier, has been implemented in pavement industry for more than 30 years. Recently, the oxidative aging mechanism of asphalt binder has been studied for several decades, and appreciable finding results of asphalt binder aging mechanism were achieved from the chemistry and rheological performance aspects. However, most of these studies were conducted with neat binders, the research of aging mechanism of modified asphalt binder was limited. Nowadays, it is still highly necessary to clarify how the asphalt binder aging happens with the modified asphalt binder, what is the effect of the different modifiers (additives) on the binder aging process, how the rheological performance changes under the thermal oxidative aging conditions and so on. The objective of this study was to investigate the effect of isothermal oxidative aging conditions on the rheological performance change of the modified and controlled asphalt binders. There were totally 14 different sorts of asphalt binders had been aged in the PAV pans in the air-force drafted ovens at 50°C, 60°C and 85°C for 0.5 day to 240 days. The Fourier-Transform Infrared Spectroscopy (FT-IR) and Dynamic Shear Rheometer (DSR) were used to perform the experiments. The analysis of rheological indices (Low shear viscosity-LSV, Crossover modulus-G*c, Glover-Rowe Parameter-G-R, DSR function-DSR Fn) as a function of carbonyl area (CA) was conducted. With the SBS modification, both of the hardening susceptibility of the rheological index-LSV and G-R decreases compared with the corresponding base binder. The TR increased the hardening susceptibility of all the rheological indexes. While for the G*c, SBS increases the slope of the most modified asphalt binders except A and B_TR_X series binders. The multiple linear regression statistical analysis results indicate that the oxidative aging conditions play an important role on the CA, and rheological performance

  10. 环氧沥青混凝土复合铺装结构疲劳试验研究%Research on the Fatigue Property of Multilayered Pavement on Concrete Bridge Deck

    Institute of Scientific and Technical Information of China (English)

    陈团结; 钱振东

    2012-01-01

    水泥混凝土桥面铺装整体结构的疲劳特性是决定铺装层使用寿命的关键.通过对双层沥青铺装层结构的复合梁以及“水泥混凝土板十双层沥青混合料铺装”三层复合结构的疲劳试验,对水泥混凝土桥面铺装层复合结构的疲劳性能进行了研究,同时考虑了层间防水粘结层的影响.结果表明当微应变为700×10-6时,“环氧沥青混凝土+SMA”结构的疲劳寿命是其他类型铺装结构的1.4倍;“水泥混凝土板十环氧沥青混凝土+SMA”三层复合结构的疲劳寿命是其他类型铺装结构的2.1倍.结论表明“环氧沥青+SMA”复合铺装结构适宜于水泥混凝土桥面铺装.%It is key for life-span of deck pavement that if the fatigue property of the whole deck pavement structure is better or not. The facts showed that when some materials with good fatigue properties were adopted, but the life of deck pavement was not prolonged at all. Here some experiments on double-layered asphalt deck pavement and "concrete deck + double-layered asphalt deck pavement" were done, along with some researches on the fatigue property of multi-layered deck pavement, considering the influence of adhesion layer. Some conclusions have been arrived that when the micro strain equals to 700 × 10-6, the fatigue life of the beam combined with epoxy asphalt concrete and SMA is 1. 4 times than other deck pavement structures; the fatigue life of the triple-layered deck pavement combined with concrete deck, epoxy asphalt concrete and SMA is 2. 1 times than other type of deck pavement. That indicates that deck pavement combined with epoxy asphalt concrete and SMA is suitable for concrete bridges.

  11. MaNIAC-UAV - a methodology for automatic pavement defects detection using images obtained by Unmanned Aerial Vehicles

    Science.gov (United States)

    Henrique Castelo Branco, Luiz; César Lima Segantine, Paulo

    2015-09-01

    Intelligent Transportation Systems - ITS is a set of integrated technologies (Remote Sensing, Image Processing, Communications Systems and others) that aim to offer services and advanced traffic management for the several transportation modes (road, air and rail). Collect data on the characteristics and conditions of the road surface and keep them update is an important and difficult task that needs to be currently managed in order to reduce accidents and vehicle maintenance costs. Nowadays several roads and highways are paved, but usually there is insufficient updated data about current condition and status. There are different types of pavement defects on the roads and to keep them in good condition they should be constantly monitored and maintained according to pavement management strategy. This paper presents a methodology to obtain, automatically, information about the conditions of the highway asphalt pavement. Data collection was done through remote sensing using an UAV (Unmanned Aerial Vehicle) and the image processing and pattern recognition techniques through Geographic Information System.

  12. Maintenance measures for preservation and recovery of permeable pavement surface infiltration rate--The effects of street sweeping, vacuum cleaning, high pressure washing, and milling.

    Science.gov (United States)

    Winston, Ryan J; Al-Rubaei, Ahmed M; Blecken, Godecke T; Viklander, Maria; Hunt, William F

    2016-03-15

    The surface infiltration rates (SIR) of permeable pavements decline with time as sediment and debris clog pore spaces. Effective maintenance techniques are needed to ensure the hydraulic functionality and water quality benefits of this stormwater control. Eight different small-scale and full-scale maintenance techniques aimed at recovering pavement permeability were evaluated at ten different permeable pavement sites in the USA and Sweden. Maintenance techniques included manual removal of the upper 2 cm of fill material, mechanical street sweeping, regenerative-air street sweeping, vacuum street sweeping, hand-held vacuuming, high pressure washing, and milling of porous asphalt. The removal of the upper 2 cm of clogging material did not significantly improve the SIR of concrete grid paves (CGP) and permeable interlocking concrete pavers (PICP) due to the inclusion of fines in the joint and bedding stone during construction, suggesting routine maintenance cannot overcome improper construction. For porous asphalt maintenance, industrial hand-held vacuum cleaning, pressure washing, and milling were increasingly successful at recovering the SIR. Milling to a depth of 2.5 cm nearly restored the SIR for a 21-year old porous asphalt pavement to like-new conditions. For PICP, street sweepers employing suction were shown to be preferable to mechanical sweepers; additionally, maintenance efforts may become more intensive over time to maintain a threshold SIR, as maintenance was not 100% effective at removing clogging material. PMID:26735865

  13. Development of an Image-based Multi-Scale Finite Element Approach to Predict Fatigue Damage in Asphalt Mixtures

    Science.gov (United States)

    Arshadi, Amir

    Image-based simulation of complex materials is a very important tool for understanding their mechanical behavior and an effective tool for successful design of composite materials. In this thesis an image-based multi-scale finite element approach is developed to predict the mechanical properties of asphalt mixtures. In this approach the "up-scaling" and homogenization of each scale to the next is critically designed to improve accuracy. In addition to this multi-scale efficiency, this study introduces an approach for consideration of particle contacts at each of the scales in which mineral particles exist. One of the most important pavement distresses which seriously affects the pavement performance is fatigue cracking. As this cracking generally takes place in the binder phase of the asphalt mixture, the binder fatigue behavior is assumed to be one of the main factors influencing the overall pavement fatigue performance. It is also known that aggregate gradation, mixture volumetric properties, and filler type and concentration can affect damage initiation and progression in the asphalt mixtures. This study was conducted to develop a tool to characterize the damage properties of the asphalt mixtures at all scales. In the present study the Viscoelastic continuum damage model is implemented into the well-known finite element software ABAQUS via the user material subroutine (UMAT) in order to simulate the state of damage in the binder phase under the repeated uniaxial sinusoidal loading. The inputs are based on the experimentally derived measurements for the binder properties. For the scales of mastic and mortar, the artificially 2-Dimensional images of mastic and mortar scales were generated and used to characterize the properties of those scales. Finally, the 2D scanned images of asphalt mixtures are used to study the asphalt mixture fatigue behavior under loading. In order to validate the proposed model, the experimental test results and the simulation results were

  14. Assessment of dynamic modulus of high density polypropylene waste fiber reinforcement in asphalt concrete

    Directory of Open Access Journals (Sweden)

    Hassan S. OTUOZE

    2015-12-01

    Full Text Available Traditional asphalt tests like Hveem and Marshall tests are at best mere characterization than effective test of pavement field performance because of complex viscoelastic behavior of asphalt. Mechanical properties otherwise called simple performance tests (SPT are performance criteria of asphalt. Dynamic modulus among other SPT’s like permanent deformation, fatigue cracking, thermal cracking, moisture susceptibility, shear and friction properties; determines stress-strain to time-temperature relationships that imparts on strength, service life and durability. The test followed the recommendations of NCHRP 1-37a (2004 and mixes were prepared using 0, 0.5, 1.0 and 1.5% HDPP contents. The parameters tested for dynamic modulus, /E*/, are stiffness, recoverable strain (ε, and phase angle (ξ. Time – temperature superposition (TTS called master curve was fitted using sigmoidal curve to interpolate the parameters beyond measured data set so as to observe the viscoelastic behavior outside the physical properties. The performance of 0.5% HDPP asphalt is better enhanced than the conventional asphalt to improve upon strength, service and durability.

  15. The effects of salt on rheological properties of asphalt after long-term aging.

    Science.gov (United States)

    Yu, Xin; Wang, Ying; Luo, Yilin; Yin, Long

    2013-01-01

    Limited studies in recent years have shown that asphalt pavement subject to seawater in coastal regions or deicing salt in cold regions may be seriously damaged after being soaked in saline water for a long time. However, there is limited research into the influence of salt on rheological properties of asphalt after long-term aging. In this study, rheological properties of unmodified and polymer-modified asphalt after long-term aging were tested after being soaked in different concentrations of salt (0.3%~5%) for different durations (1 day~30 days). Orthogonal array based on the Taguchi method was used for experimental design. The frequency sweep tests were performed on the specimens of aged asphalt after being soaked for complex modulus and phase angle master curves and ultimate fatigue temperature. BBR tests were performed for stiffness. The test results indicate that saline water appears to reduce low temperature properties and fatigue resistance properties and improved high temperature properties of aged asphalt, and it also affects the sensitivity of complex modulus and phase angles at low frequencies. PMID:24459450

  16. A feasibility study to use coal tar contaminated soil in asphalt cement mixture production

    International Nuclear Information System (INIS)

    Coal tars are the residues produced during the gasification of coal. Traditionally, coal tars were buried onsite at the power plants or left as residuals in the bottom of gas holders. Currently, there are more than 1,500 such historic sites which will undergo site assessment in the near future. The use of coal tar residuals in asphalt-based products could result in greatly reduced disposal costs, in comparison to current methods of disposal. Present disposal practice of coal tar contaminated residuals includes disposal in hazardous waste landfills or incineration. Treatment and disposal costs are reported to be as much as $1,000/ton for current coal tar contaminated residuals disposal options. This feasibility study was performed to determine the use of coal tar contaminated soil (CTCS) in bituminous materials to produce hot asphalt mix. Mixtures of varying composition of CTCS and bituminous material were produced to perform TCLP. The air emissions during the mixing process were captured and analyzed. In this study, a bench scale investigation was performed to identify and quantify the emissions from heating the CTCS at the mixer temperature. The pilot scale investigations were performed by replacing reclaimable asphalt pavement (RAP) with CTCS during the hot asphalt mix production. The investigations were performed on two types of mixtures; using CTCS as the direct additive in the first type, and using SS-1 (slow setting asphalt emulsion) stabilized CTCS as an additive in the second type

  17. A feasibility study to use coal tar contaminated soil in asphalt cement mixture production

    Energy Technology Data Exchange (ETDEWEB)

    Dulam, C.S.; Hoag, G.E.; Dahmani, A.; Nadim, F. [Univ. of Connecticut, Storrs, CT (United States). Environmental Research Inst.

    1996-11-01

    Coal tars are the residues produced during the gasification of coal. Traditionally, coal tars were buried onsite at the power plants or left as residuals in the bottom of gas holders. Currently, there are more than 1,500 such historic sites which will undergo site assessment in the near future. The use of coal tar residuals in asphalt-based products could result in greatly reduced disposal costs, in comparison to current methods of disposal. Present disposal practice of coal tar contaminated residuals includes disposal in hazardous waste landfills or incineration. Treatment and disposal costs are reported to be as much as $1,000/ton for current coal tar contaminated residuals disposal options. This feasibility study was performed to determine the use of coal tar contaminated soil (CTCS) in bituminous materials to produce hot asphalt mix. Mixtures of varying composition of CTCS and bituminous material were produced to perform TCLP. The air emissions during the mixing process were captured and analyzed. In this study, a bench scale investigation was performed to identify and quantify the emissions from heating the CTCS at the mixer temperature. The pilot scale investigations were performed by replacing reclaimable asphalt pavement (RAP) with CTCS during the hot asphalt mix production. The investigations were performed on two types of mixtures; using CTCS as the direct additive in the first type, and using SS-1 (slow setting asphalt emulsion) stabilized CTCS as an additive in the second type.

  18. The Effects of Salt on Rheological Properties of Asphalt after Long-Term Aging

    Directory of Open Access Journals (Sweden)

    Xin Yu

    2013-01-01

    Full Text Available Limited studies in recent years have shown that asphalt pavement subject to seawater in coastal regions or deicing salt in cold regions may be seriously damaged after being soaked in saline water for a long time. However, there is limited research into the influence of salt on rheological properties of asphalt after long-term aging. In this study, rheological properties of unmodified and polymer-modified asphalt after long-term aging were tested after being soaked in different concentrations of salt (0.3%~5% for different durations (1 day~30 days. Orthogonal array based on the Taguchi method was used for experimental design. The frequency sweep tests were performed on the specimens of aged asphalt after being soaked for complex modulus and phase angle master curves and ultimate fatigue temperature. BBR tests were performed for stiffness. The test results indicate that saline water appears to reduce low temperature properties and fatigue resistance properties and improved high temperature properties of aged asphalt, and it also affects the sensitivity of complex modulus and phase angles at low frequencies.

  19. Dynamic contracting mechanism for pavement maintenance management

    NARCIS (Netherlands)

    Demirel, H.C.; De Ridder, H.A.J.

    2013-01-01

    Technological advances, financial possibilities and changes of demands have increasingly affected the pavement maintenance environment for outsourcing in recent years. This induces complexity in the contracting methods of pavement maintenance activities. Despite the fact that current contracting pra

  20. Pervious Pavement System Evaluation-Poster

    Science.gov (United States)

    Pervious pavement is a low impact development stormwater control. The Environmental Protection Agency's Urban Watershed Management Branch is evaluating interlocking concrete pavingstone pervious pavement systems. The pavingstones themselves are impermeable, but the spaces between...