WorldWideScience

Sample records for asphalt mixtures

  1. 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.

  2. 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...

  3. 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...

  4. 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...

  5. 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...

  6. 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...

  7. Microstructural characterisation of rubber modified asphalt mixtures

    OpenAIRE

    Abdul Hassan, Norhidayah

    2013-01-01

    Research to improve the performance of asphalt mixtures through the addition of crumb rubber using the dry process has continued worldwide because of its potential as a recycling option for used tires. For decades, dry mixed rubberised asphalt mixtures have performed inconsistently in field trials and laboratory evaluations. However, current research has revealed that the performance of asphalt mixtures is highly dependent on the characteristics of its internal structure or phase constituents...

  8. 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.

  9. Asphalt Mixture for the First Asphalt Concrete Directly Fastened Track in Korea

    OpenAIRE

    Seong-Hyeok Lee; Dae-Wook Park; Hai Viet Vo; Samer Dessouky

    2015-01-01

    The research has been initiated to develop the asphalt mixtures which are suitable for the surface of asphalt concrete directly fastened track (ADFT) system and evaluate the performance of the asphalt mixture. Three aggregate gradations which are upper (finer), medium, and below (coarser). The nominal maximum aggregate size of asphalt mixture was 10 mm. Asphalt mixture design was conducted at 3 percent air voids using Marshall mix design method. To make impermeable asphalt mixture surface, th...

  10. 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.

  11. Asphalt rubber mixtures in Portugal: fatigue resistance

    OpenAIRE

    Miranda, Henrique; Batista, Fátima; Neves, José; Antunes, Maria de Lurdes; Fonseca, Paulo

    2009-01-01

    This paper presents a study concerning the fatigue behaviour of asphalt mixtures with bitumen modified with high content of crumb rubber used in Portugal. For assessing the fatigue behaviour of this type of mixtures, four asphalt mixtures with high content of crumb rubber were used: two field bituminous mixtures – an open-graded and a gap-graded – both with granite aggregates; and two laboratory manufactured bituminous mixtures – an open-graded mixture with granite aggregates and a gap-graded...

  12. Asphalt Mixture for the First Asphalt Concrete Directly Fastened Track in Korea

    Directory of Open Access Journals (Sweden)

    Seong-Hyeok Lee

    2015-01-01

    Full Text Available The research has been initiated to develop the asphalt mixtures which are suitable for the surface of asphalt concrete directly fastened track (ADFT system and evaluate the performance of the asphalt mixture. Three aggregate gradations which are upper (finer, medium, and below (coarser. The nominal maximum aggregate size of asphalt mixture was 10 mm. Asphalt mixture design was conducted at 3 percent air voids using Marshall mix design method. To make impermeable asphalt mixture surface, the laboratory permeability test was conducted for asphalt mixtures of three different aggregate gradations using asphalt mixture permeability tester. Moisture susceptibility test was conducted based on AASHTO T 283. The stripping percentage of asphalt mixtures was measured using a digital camera and analyzed based on image analysis techniques. Based on the limited research results, the finer aggregate gradation is the most suitable for asphalt mixture for ADFT system with the high TSR value and the low stripping percentage and permeable coefficient. Flow number and beam fatigue tests for finer aggregate asphalt mixture were conducted to characterize the performance of asphalt mixtures containing two modified asphalt binders: STE-10 which is styrene-butadiene-styrene (SBS polymer and ARMA which is Crum rubber modified asphalt. The performance tests indicate that the STE-10 shows the higher rutting life and fatigue life.

  13. Laboratory aging of asphalt mixtures : simulation of reclaimed asphalt and application as test method for durability

    OpenAIRE

    Mollenhauer, Konrad; MOUILLET, Virginie; PIERARD, Nathalie; TUSAR, Marjan; Gabet, Thomas

    2012-01-01

    Surface asphalt courses reach their end of service life after a time span between 10 and 30 years, depending on their durability. Afterwards, the surface layer is usually milled and reused in asphalt mixtures as reclaimed asphalt. In order to enable the analysis of durability and recyclability of a new asphalt mixture, four laboratory aging procedures were designed and comparatively applied on twoasphalt mixes. Besides aging of loose asphalt mix in heating cabinets at varied temperatures and ...

  14. Strength Mechanism and Influence Factors for Cold Recycled Asphalt Mixture

    OpenAIRE

    Tao Ma; Hao Wang; Yongli Zhao; Xiaoming Huang; Yuhui Pi

    2015-01-01

    This study focused on the key factors affecting the tensile strength of cold recycled asphalt mixture with cement and emulsified asphalt. The specific surface areas and strength of RAP were analyzed. The interaction between the emulsified asphalt and cement was observed. Comprehensive laboratory testing was conducted to evaluate the influences of RAP, emulsified asphalt, and cement on the tensile strength of cold recycled asphalt mixture. It is found that although RAP is used as aggregates, i...

  15. About Coloured Cold Asphaltic Mixtures

    Directory of Open Access Journals (Sweden)

    Loredana Judele

    2008-01-01

    Full Text Available The first coloured bitumen was obtained by using bitumen from Peru and then bitumen from the Middle East, with a low content of asphaltenes, also called "colourable" bitumens. The colours obtained by adding iron oxides led nevertheless to dark colours, due to the presence of asphaltenes. Nowadays the coloured asphalt is obtained from synthesis binders with translucent aspect. The colours are obtained by adding inorganic pigments, mainly iron oxide for red, chromic oxide for green, titanic dioxide for white. The properties and behaviour of the coloured bitumen during its lifetime are comparable with the ones of classic bitumen, sometimes even better.

  16. Performance-based asphalt mixture design methodology

    Science.gov (United States)

    Ali, Al-Hosain Mansour

    Today, several State D.O.T.s are being investigating the use of tire rubber with local conventional materials. Several of the ongoing investigations identified potential benefits from the use of these materials, including improvements in material properties and performance. One of the major problems is being associated with the transferability of asphalt rubber technology without appropriately considering the effects of the variety of conventional materials on mixture behavior and performance. Typically, the design of these mixtures is being adapted to the physical properties of the conventional materials by using the empirical Marshall mixture design and without considering fundamental mixture behavior and performance. Use of design criteria related to the most common modes of failure for asphalt mixtures, such as rutting, fatigue cracking, and low temperature thermal cracking have to be developed and used for identifying the "best mixture," in term of performance, for the specific local materials and loading conditions. The main objective of this study was the development of a mixture design methodology that considers mixture behavior and performance. In order to achieve this objective a laboratory investigation able to evaluate mixture properties that can be related to mixture performance, (in terms of rutting, low temperature cracking, moisture damage and fatigue), and simulating the actual field loading conditions that the material is being exposed to, was conducted. The results proved that the inclusion of rubber into asphalt mixtures improved physical characteristics such as elasticity, flexibility, rebound, aging properties, increased fatigue resistance, and reduced rutting potential. The possibility of coupling the traditional Marshall mix design method with parameters related to mixture behavior and performance was investigated. Also, the SHRP SUPERPAVE mix design methodology was reviewed and considered in this study for the development of an integrated

  17. Impact of defective production of asphalt mixture resulting in damaged asphalt layers

    OpenAIRE

    Hrovat, Tea

    2013-01-01

    In practice it often happens that a newly built road soon, after the asphalt mixture is added, starts showing first cracks and damages, which are not necessarily always a fault of the contractor, who built in the asphalt mixture, but can derive from the production of asphalt mixture. Such mistakes in the production of the asphalt mixture are hard to prove, since all the contractors usually put the blame on the automatic mixing production in the asphalt plant. During the production of the asph...

  18. Laboratory mix design of asphalt mixture containing reclaimed material

    OpenAIRE

    Davide Lo Presti; Rawid Khan; Norhidayah Abdul Hassan; Gordon Airey; Andrew Collop

    2014-01-01

    This paper presents a study on the production of asphalt test specimens in the laboratory containing reclaimed asphalt. The mixtures considered were stone mastic asphalt concrete mixtures containing up to 30% of reclaimed asphalt. Specimens were compacted to the reference density obtained from the Marshall mix design. Gyration compaction method was used for preparing specimens for the experimental programme, while coring and cutting methods and X-ray computed tomography (CT) were used to inve...

  19. 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...

  20. Simulation of rheological behavior of asphalt mixture with lattice model

    Institute of Scientific and Technical Information of China (English)

    杨圣枫; 杨新华; 陈传尧

    2008-01-01

    A three-dimensional(3D) lattice model for predicting the rheological behavior of asphalt mixtures was presented.In this model asphalt mixtures were described as a two-phase composite material consisting of asphalt sand and coarse aggregates distributed randomly.Asphalt sand was regarded as a viscoelastic material and aggregates as an elastic material.The rheological response of asphalt mixture subjected to different constant stresses was simulated.The calibrated overall creep strain shows a good approximation to experimental results.

  1. 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.

  2. Evaluation of Hydrated Lime Filler in Asphalt Mixtures

    OpenAIRE

    Mohammed Abbas Hasan Al-Jumaily

    2008-01-01

    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 fund...

  3. Viscoelastic Analysis of Asphalt Mixture Based on Creep Test

    OpenAIRE

    Lihua Zhao; Jingyun Chen; Shengwu Wang

    2013-01-01

    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 ...

  4. 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 ...

  5. 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...

  6. 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.

  7. Effect of Residual Asphalt Content on Creep Strain of Cement Modified Emulsified Asphalt Mixtures

    OpenAIRE

    Seref Oruc; Murat Bostancioglu; Bahadir Yilmaz

    2013-01-01

    Objective of this paper is to determine the rutting performance of residual asphalt content oncement modified emulsified asphalt mixtures at heavy duty highways. For this purpose, emulsified asphaltspecimens with dense graded aggregate were prepared according to Marshall method for emulsified asphaltaggregatecold mixture design. The specimens were prepared in such a way that portland cement wassubstituted for mineral filler in an increased percent from 0 % to 6 %. In this way, three asphalt e...

  8. Analysing polystyrene-modified asphalt and its incidence in a heat-dense asphalt mixture

    OpenAIRE

    Ana Sofía Figueroa Infante; Fredy Alberto Reyes Lizcano; Diana Hernández Barrera; Christian Jiménez; Natalia Bohórquez

    2010-01-01

    This article presents some results obtained with an MDC-2 asphalt/polystyrene-modified asphalt mixture as a result of crushing waste glass. The stone, asphalt and polystyrene materials’ were characterised for drawing up the design. The Marshal method was used for obtaining the best asphalt- stone-polystyrene percentages. The Superpave method was used for analysing the asphalt; the mixture’s dynamic behaviour was analysed using a test involving 20ºC and 30ºC trapezoidal fatigue for 90x10-6, 15...

  9. 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...

  10. Review and Recommendation of Cold Asphalt Emulsion Mixtures Caems Design

    OpenAIRE

    I Nyoman Arya Thanaya

    2007-01-01

    Note from the Editor Cold Asphalt Emulsion Mixture (CAEM) is a mixture of aggregates and asphalt emulsion that is mixed at room temperature. It is relatively simple to produce, but the design procedure provided by the Asphalt Institute and the Ministry of Public Work of Indonesia pose some problems in its practical application. This Technical Note discusses limitations of the current design procedures and presents a simpler and more practicable design procedure

  11. Review and Recommendation of Cold Asphalt Emulsion Mixtures Caems Design

    Directory of Open Access Journals (Sweden)

    I Nyoman Arya Thanaya

    2007-01-01

    Full Text Available Note from the Editor Cold Asphalt Emulsion Mixture (CAEM is a mixture of aggregates and asphalt emulsion that is mixed at room temperature. It is relatively simple to produce, but the design procedure provided by the Asphalt Institute and the Ministry of Public Work of Indonesia pose some problems in its practical application. This Technical Note discusses limitations of the current design procedures and presents a simpler and more practicable design procedure

  12. 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.

  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. Behaviour of asphalt rubber mixtures with different crumb rubber and asphalt binder sources

    OpenAIRE

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

    2006-01-01

    This study evaluates the performance in laboratory of gap graded mixture prepared with different crumb rubber types and different conventional grade asphalt binders. The asphalt rubbers were prepared via wet process (continuous blend) and their properties were measured through the current tests: (i) penetration;(ii) softening point: (iii) resilience; (iv) apparent viscosity using a Brookfield viscometer. The rheological properties for conventional asphalts were measured too, in order to evalu...

  16. 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.

  17. DURABILITY OF ASPHALT CONCRETE MIXTURES USING DOLOMITE AGGREGATES

    Directory of Open Access Journals (Sweden)

    Imad Al-Shalout

    2015-12-01

    Full Text Available This study deals with the durability of asphalt concrete, including the effects of different gradations, compaction temperatures and immersion time on the durability potential of mixtures. The specific objectives of this study are: to investigate the effect of compaction temperature on the mechanical properties of asphalt concrete mixtures; investigate the effect of bitumen content and different aggregate gradations on the durability potential of bituminous mixtures.

  18. Laboratory Mix Design of Asphalt Mixture Containing Reclaimed Material

    Directory of Open Access Journals (Sweden)

    Davide Lo Presti

    2014-01-01

    Full Text Available This paper presents a study on the production of asphalt test specimens in the laboratory containing reclaimed asphalt. The mixtures considered were stone mastic asphalt concrete mixtures containing up to 30% of reclaimed asphalt. Specimens were compacted to the reference density obtained from the Marshall mix design. Gyration compaction method was used for preparing specimens for the experimental programme, while coring and cutting methods and X-ray computed tomography (CT were used to investigate the change in properties within the specimens and to validate the selected methodology. The study concluded that gyratory compaction is suitable to produce homogeneous test specimens also for mixtures containing high amount of reclaimed asphalt. Nevertheless, preliminary trials for each material are mandatory, as well as final coring and trimming of the specimens due to side effects.

  19. Performance Evaluation of Stone Mastic Asphalt and Hot Mix Asphalt Mixtures Containing Recycled Concrete Aggregate

    Directory of Open Access Journals (Sweden)

    Mohammad Saeed Pourtahmasb

    2014-01-01

    Full Text Available Environmental and economic considerations have encouraged civil engineers to find ways to reuse recycled materials in new constructions. The current paper presents an experimental research on the possibility of utilizing recycled concrete aggregates (RCA in stone mastic asphalt (SMA and hot mix asphalt (HMA mixtures. Three categories of RCA in various percentages were mixed with virgin granite aggregates to produce SMA and HMA specimens. The obtained results indicated that, regardless of the RCA particular sizes, the use of RCA to replace virgin aggregates increased the needed binder content in the asphalt mixtures. Moreover, it was found that even though the volumetric and mechanical properties of the asphalt mixtures are highly affected by the sizes and percentages of the RCA but, based on the demands of the project and traffic volume, utilizing specific amounts of RCA in both types of mixtures could easily satisfy the standard requirements.

  20. Rheological properties of asphalt mixtures containing various fibers

    Institute of Scientific and Technical Information of China (English)

    叶群山; 吴少鹏; 陈筝; 刘至飞

    2008-01-01

    Rheological characteristics of fiber-modified asphalt mixture were investigated.Cellulous fiber,polyester fiber and mineral fiber were used as additives for asphalt mixture,and the dosages were 0.3%,0.3%,0.4%,respectively.Dynamic modulus test using superpave simple performance tester(SPT) was adopted to study the dynamic modulus and phase angle for the control mixture and fiber-modified ones at various temperatures and frequencies.Test results show that the rheological properties can be improved significantly by the addition of various fibers.The dynamic modulus increases with the increase of frequency,and the phase angle decreases with the increase of frequency.When various fibers are used,the dynamic modulus increases and phase angle decreases at each frequency.This indicates that the stiffness and the elastic portion of fiber-modified asphalt mixtures can be enhanced when various fibers are used,which results in the change of viscoelastic properties of mixtures.The creep test results show that the total strain and the permanent strain of asphalt mixtures during load-unload cycle can be significantly reduced,which results in the improvement of resistance to permanent deformation for asphalt mixtures containing various fiber additives.The Burgers model can be employed effectively to illustrate the rheological properties of fiber modified asphalt mixtures.

  1. 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...

  2. 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.

  3. Effects of Fibers on the Dynamic Properties of Asphalt Mixtures

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    The dynamic characteristics of fiber-modified asphalt mixture were investigated. Cellulose fiber, polyester fiber and mineral fiber were used as additives for asphalt mixture, and the dosage was 0.3%, 0.3%,0.4%, respectively. Dynamic modulus test using SuperPave simple performance tester (SPT) was conducted to study the dynamic modulus (E*) and phase angle (δ) for the control asphalt mixture and fiber-modified ones at various temperatures and frequencies. Experimental results show that all fiber-modified asphalt mixtures have higher dynamic modulus compared with control mixture. The dynamic modulus master curves of each type of asphalt mixtures are determined based on nonlinear least square regression in accordance with the timetemperature superposition theory at a control temperature (21.1 ℃). The fatigue parameter E*×sinδ and rutting parameter E*/sinδ of asphalt mixture are adopted to study the fatigue and rutting-resistance properties, and experimental results indicate that such properties can be improved by fiber additives.

  4. Analysing polystyrene-modified asphalt and its incidence in a heat-dense asphalt mixture

    Directory of Open Access Journals (Sweden)

    Ana Sofía Figueroa Infante

    2010-04-01

    Full Text Available This article presents some results obtained with an MDC-2 asphalt/polystyrene-modified asphalt mixture as a result of crushing waste glass. The stone, asphalt and polystyrene materials’ were characterised for drawing up the design. The Marshal method was used for obtaining the best asphalt- stone-polystyrene percentages. The Superpave method was used for analysing the asphalt; the mixture’s dynamic behaviour was analysed using a test involving 20ºC and 30ºC trapezoidal fatigue for 90x10-6, 150x10-6 and 220x10-6m deformation. The truck-wheel test was analysed for a 13-ton load, similar to that of the heaviest axle on a Transmilenio (articulated bus. The dynamic module test was analysed for 15ºC, 20ºC and 30ºC and 2.5, 5 and 10 Hz frequencies. Conventional asphalt mixture and modified asphalt results were contrasted, interesting behaviour being observed regarding plastic deformation of the modified mixture in service

  5. 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.

  6. 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

  7. Performance Evaluation of Stone Mastic Asphalt and Hot Mix Asphalt Mixtures Containing Recycled Concrete Aggregate

    OpenAIRE

    Mohammad Saeed Pourtahmasb; Mohamed Rehan Karim

    2014-01-01

    Environmental and economic considerations have encouraged civil engineers to find ways to reuse recycled materials in new constructions. The current paper presents an experimental research on the possibility of utilizing recycled concrete aggregates (RCA) in stone mastic asphalt (SMA) and hot mix asphalt (HMA) mixtures. Three categories of RCA in various percentages were mixed with virgin granite aggregates to produce SMA and HMA specimens. The obtained results indicated that, regardless of t...

  8. 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.

  9. Effectiveness of Micro- and Nanomaterials in Asphalt Mixtures through Dynamic Modulus and Rutting Tests

    OpenAIRE

    Hui Yao; Zhanping You

    2016-01-01

    The objectives of this research are to use micro- and nanomaterials to modify the asphalt mixture and to evaluate the mechanical performance of asphalt mixtures. These micro- and nanomaterials, including carbon microfiber, Nanomer material, nanosilica, nonmodified nanoclay, and polymer modified nanoclay, were selected to blend with the control asphalt to improve the overall performance of the modified asphalt binders and mixtures. The microstructures of original materials and asphalt binders ...

  10. 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...

  11. 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.

  12. 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.

  13. 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.

  14. 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...

  15. SGC Tests for Influence of Material Composition on Compaction Characteristic of Asphalt Mixtures

    OpenAIRE

    Qun Chen; Yuzhi Li

    2013-01-01

    Compaction characteristic of the surface layer asphalt mixture (13-type gradation mixture) was studied using Superpave gyratory compactor (SGC) simulative compaction tests. Based on analysis of densification curve of gyratory compaction, influence rules of the contents of mineral aggregates of all sizes and asphalt on compaction characteristic of asphalt mixtures were obtained. SGC Tests show that, for the mixture with a bigger content of asphalt, its density increases faster, that there is a...

  16. Image analysis of aggregate,mastic and air void phases for asphalt mixture%Image analysis of aggregate, mastic and air void phases for asphalt mixture

    Institute of Scientific and Technical Information of China (English)

    ADHIKARI Sanjeev; YOU Zhan-ping; HAO Pei-wen; WANG Hai-nian

    2013-01-01

    The shape characterization and spatial distribution of aggregate,mastic and air void phases for asphalt mixture were analyzed.Three air void percentage asphalt mixtures,4%,7% and 8%,respectively,were cut into cross sections and polished.X-ray scanning microscope was used to capture aggregate,mastic,air void phase by the image.The average of polygon diameter was chosen as a threshold to determine which aggregates would be retained on a given sieve.The aggregate morphological image from scanned image was utilized by digital image processing method to calculate the gradation of aggregate and simulate the real gradation.Analysis result shows that the air void of asphalt mixture has influence on the correlation between calculation gradation and actual gradation.When comparing 4.75 mm sieve size of 4%,7% and 8% air void asphalt mixtures,7% air void asphalt mixture has 55% higher than actual size gradation,8% air void asphalt mixture has 8% higher than actual size gradation,and 4% air void asphalt mixture has 3.71% lower than actual size gradation.4% air void asphalt mixture has the best correlation between calculation gradation and actual gradation comparing to other specimens.The air void percentage of asphalt mixture has no obvious influence on the air void orientation,and three asphalt mixtures show the similar air orientation along the same direction.4 tabs,7 figs,17 refs.

  17. Some Properties of Emulsified Asphalt Paving Mixture at Iraqi Environmental Conditions

    OpenAIRE

    Shakir.A.Al-Mishhadani; Hasan.H.Al-Baid

    2014-01-01

    Cold emulsified asphalt mixture is generally a mix made of emulsified asphalt withaggregate. Emulsified asphalt is manufactured from base asphalt, emulsifier agent and waterwith approximate percentage of 40% to 75% asphalt, 0.1% to 2.5% emulsifier and 25% to60% water plus some minor components. This study aims to use the cold emulsified asphaltmixtures for road construction and maintenance in Iraq as an alternative to the hot asphaltmixtures, due to its economical, practical and environmental...

  18. 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

  19. 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 ...

  20. Investigation of Adding Proportion of RAP in Recycled Asphalt Mixture

    Directory of Open Access Journals (Sweden)

    Cao He

    2016-01-01

    Full Text Available According to the relationship between gradation and proportion of Reclaimed Asphalt Pavement (RAP and design gradation of recycled mixture, the authors discussed the influence of proportion of RAP on gradation adjustment of recycled mixture. And then, recycled mixture with 0%, 30%, 50%, 70% of RAP were made, and Influence of proportion of RAP on high and low temperature performance, water stability and anti-aging performance of recycled mixture were discussed. The results and analysis indicate that gradation of recycled mixture would not be adjusted to aiming gradation if proportion of RAP was too big. With the increase of proportion of RAP, high temperature performance and anti-aging performance of recycled mixture enhanced, but low temperature performance and water stability decayed sharply. In practical application, reasonable proportion of RAP should be determined according to gradation, performance demand and economy of recycled mixture.

  1. SGC Tests for Influence of Material Composition on Compaction Characteristic of Asphalt Mixtures

    Directory of Open Access Journals (Sweden)

    Qun Chen

    2013-01-01

    Full Text Available Compaction characteristic of the surface layer asphalt mixture (13-type gradation mixture was studied using Superpave gyratory compactor (SGC simulative compaction tests. Based on analysis of densification curve of gyratory compaction, influence rules of the contents of mineral aggregates of all sizes and asphalt on compaction characteristic of asphalt mixtures were obtained. SGC Tests show that, for the mixture with a bigger content of asphalt, its density increases faster, that there is an optimal amount of fine aggregates for optimal compaction and that an appropriate amount of mineral powder will improve workability of mixtures, but overmuch mineral powder will make mixtures dry and hard. Conclusions based on SGC tests can provide basis for how to adjust material composition for improving compaction performance of asphalt mixtures, and for the designed asphalt mixture, its compaction performance can be predicted through these conclusions, which also contributes to the choice of compaction schemes.

  2. SGC tests for influence of material composition on compaction characteristic of asphalt mixtures.

    Science.gov (United States)

    Chen, Qun; Li, Yuzhi

    2013-01-01

    Compaction characteristic of the surface layer asphalt mixture (13-type gradation mixture) was studied using Superpave gyratory compactor (SGC) simulative compaction tests. Based on analysis of densification curve of gyratory compaction, influence rules of the contents of mineral aggregates of all sizes and asphalt on compaction characteristic of asphalt mixtures were obtained. SGC Tests show that, for the mixture with a bigger content of asphalt, its density increases faster, that there is an optimal amount of fine aggregates for optimal compaction and that an appropriate amount of mineral powder will improve workability of mixtures, but overmuch mineral powder will make mixtures dry and hard. Conclusions based on SGC tests can provide basis for how to adjust material composition for improving compaction performance of asphalt mixtures, and for the designed asphalt mixture, its compaction performance can be predicted through these conclusions, which also contributes to the choice of compaction schemes. PMID:23818830

  3. Characterization of Various Plant-Produced Asphalt Concrete Mixtures Using Dynamic Modulus Test

    OpenAIRE

    Muhammad Irfan; Asad S. Waraich; Sarfraz Ahmed; Yasir Ali

    2016-01-01

    This research characterizes the performance of various plant-produced asphalt concrete mixtures by dynamic modulus |E∗| test using asphalt mixture performance tester (AMPT). Marshall designed specimens of seven different mixtures were prepared using the Superpave gyratory compactor and subjected to sinusoidal compressive loading at various temperatures (4.4 to 54.4°C) and loading frequencies (0.1 to 25 Hz). A catalog of default dynamic modulus values for typical asphalt concrete mixtures of P...

  4. Utilization of Recycled Concrete Aggregates in Stone Mastic Asphalt Mixtures

    OpenAIRE

    Mohammad Saeed Pourtahmasb; Mohamed Rehan Karim

    2014-01-01

    Recycled concrete aggregate (RCA) is considered as one of the largest wastes in the entire world which is produced by demolishing concrete structures such as buildings, bridges, and dams. It is the intention of scientists and researchers, as well as people in authority, to explore waste material recycling for environmental and economic advantages. The current paper presents an experimental research on the feasibility of reusing RCA in stone mastic asphalt (SMA) mixtures as a partial replaceme...

  5. Analysis of moisture susceptibility of different loose coated asphalt mixtures

    International Nuclear Information System (INIS)

    The durability is one of the significant properties of bituminous paving mixtures. It is shown that moisture damage is one of the primary factors affecting the durability of the mixtures. Moisture damage is basically a combined result of two mechanisms: a) Loss of adhesion between the bitumen and aggregate interface and b) Loss of cohesion in the mixture along with several other factors like the changes in binders, aggregates qualities and something else. The aim of this study is therefore to examine the moisture sensitivity, of different combinations of five different kinds of aggregate quarries/sources and six binder types of different penetration grade and properties, and compare the performance of these combinations between four laboratory tests: Static Immersion Test, Total Water Immersion Test (TWIT) Test, Boiling TWIT Test and Rolling Bottle Test. The tests have been carried out at the Taxila Institute of Transportation Engineering (TITE) to obtain the data for loose coated bituminous paving mixtures. The results show that the combination of Margallah aggregate source and ELVALOY Polymer Modified Bitumen provides best resistance against moisture damage and Rolling Bottle Test is the best test to discriminate between different loose coated Asphalt mixtures, irrespective of time taken by the test. major factors that caused moisture-related problems: adhesive failure, bitumen stripping off the aggregate surface and cohesive failure which is due to the loss of mixture stiffness. Moisture-related problems do not occur without the presence of water and traffic, which provides energy to break the adhesive bonds and cause cohesive failures. Repeated freeze-thaw cycles can also accelerate the distress in the pavement. Since the performance of Asphalt mixtures under the affect of moisture is a very complex issue, various researches have been made to simulate the moisture damage in the past years. Asphalt technologists have carried out many attempts to develop

  6. The Research on Improvement of Low Temperature Stability for Diatomite Modified Asphalt Mixture with PE Particles

    Directory of Open Access Journals (Sweden)

    HU Qiusheng

    2015-01-01

    Full Text Available In light of the lake of low temperature stability for diatomaceous which used as asphalt modifier.Stat the research with the diatomite produced at Jilin Changbai, using the way of low temperature bending test to evaluate the PE and diatomite composite modified asphalt mixture’s low temperature crack resistance performance. The results showed that after the diatomite and PE composite modified asphalt mixture has the best advantage of anti-cracking performance under low-temperature environment,which is better than PE modified asphalt mixture and the matrix asphalt mixture. As a result,asphalt mixture being composite modified by diatomite and PE could significantly improve asphalt mixture’s low temperature stable performance.

  7. 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.

  8. 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.

  9. The Use of Polyethylene in Hot Asphalt Mixtures

    Directory of Open Access Journals (Sweden)

    Mohammad T. Awwad

    2007-01-01

    Full Text Available The increase in road traffic during the last two decades in combination with an insufficient degree of maintenance due to shortage in funds has caused an accelerated and continuous deterioration of the road network in Jordan. To alleviate this process, several types of measures may be effective, e.g., securing funds for maintenance, improved roadway design, use of better quality of materials and the use of more effective construction methods. The use of polymer in asphalt mixture as a modifier started in the 80s of the last century and has been tested in a number of countries around the World. In this research, polyethylene as one sort of polymers is used to investigate the potential prospects to enhance asphalt mixture properties. The objectives also include determining the best type of polyethylene to be used and its proportion. Two types of polyethylene were added to coat the aggregate [High Density Polyethylene (HDPE and Low Density Polyethylene (LDPE]. The polymers were introduced to the mixture in two states (Grinded and not Grinded. Marshall mix design was used, first to determine the optimum bitumen binder content and then further to test the modified mixture properties. In total, 105 samples were prepared (21 samples were used to determine the binder content and the remaining samples were used to investigate the effect of modifying the asphalt mixtures. The optimum asphalt content was 5.4%. Seven proportions of polyethylene of each type and state by weight of the optimum binder content were selected to be tested (6, 8, 10, 12, 14, 16 and 18%. The tests include the determination of bulk density, stability and flow. Marshall mix design requires the determination of the percentages of air voids and air voids of mineral aggregate. The results indicated that grinded HDPE polyethylene modifier provides better engineering properties. The recommended proportion of the modifier is 12% by the weight of bitumen content. It is found to increase the

  10. Some Properties of Emulsified Asphalt Paving Mixture at Iraqi Environmental Conditions

    Directory of Open Access Journals (Sweden)

    Shakir.A.Al-Mishhadani

    2014-02-01

    Full Text Available Cold emulsified asphalt mixture is generally a mix made of emulsified asphalt withaggregate. Emulsified asphalt is manufactured from base asphalt, emulsifier agent and waterwith approximate percentage of 40% to 75% asphalt, 0.1% to 2.5% emulsifier and 25% to60% water plus some minor components. This study aims to use the cold emulsified asphaltmixtures for road construction and maintenance in Iraq as an alternative to the hot asphaltmixtures, due to its economical, practical and environmental advantages. This studyfocusedto test and evaluates the emulsified asphalt material properties to be used as paving mixture.The tested properties of emulsified asphalt mixture were bulk density, air voids, dry Marshallstability, wet Marshall stability, retained Marshall stability, flow tests and compared with thecommon used specification.The results indicate that the emulsified asphalt type cationic slowsetting low viscosity (CSS-1 is very suitable with quartz type of aggregate from Al-Nibaayquarry. From many trial mixes it is found that the best percentages of initial residual bitumencontent to produced adequateresults for coating test ,mixing ,compaction ,curing and Marshallstability were ranged from (2.5%, 3%,3.5%,4% and 4.5%, andthe optimum percentage is(3.5%.Finally it can be conducted that the emulsified asphalt mixture is a suitable alternativemixture to the hot asphalt mixture for road construction and maintenance in Iraq.

  11. Some Properties of Emulsified Asphalt Paving Mixture at Iraqi Environmental Conditions

    Directory of Open Access Journals (Sweden)

    Shakir.A.Al-Mishhadani* Hasan.H.Al-Baid

    2014-04-01

    Full Text Available Cold emulsified asphalt mixture is generally a mix made of emulsified asphalt withaggregate. Emulsified asphalt is manufactured from base asphalt, emulsifier agent and waterwith approximate percentage of 40% to 75% asphalt, 0.1% to 2.5% emulsifier and 25% to60% water plus some minor components. This study aims to use the cold emulsified asphaltmixtures for road construction and maintenance in Iraq as an alternative to the hot asphaltmixtures, due to its economical, practical and environmental advantages. This studyfocusedto test and evaluates the emulsified asphalt material properties to be used as paving mixture.The tested properties of emulsified asphalt mixture were bulk density, air voids, dry Marshallstability, wet Marshall stability, retained Marshall stability, flow tests and compared with thecommon used specification.The results indicate that the emulsified asphalt type cationic slowsetting low viscosity (CSS-1 is very suitable with quartz type of aggregate from Al-Nibaayquarry. From many trial mixes it is found that the best percentages of initial residual bitumencontent to produced adequateresults for coating test ,mixing ,compaction ,curing and Marshallstability were ranged from (2.5%, 3%,3.5%,4% and 4.5%, andthe optimum percentage is(3.5%.Finally it can be conducted that the emulsified asphalt mixture is a suitable alternativemixture to the hot asphalt mixture for road construction and maintenance in Iraq.  

  12. 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...

  13. 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.

  14. Determination of Required Energy Action at Formation of Asphalt Concrete Mixture

    OpenAIRE

    B. M. Khroustalev; V. N. Romaniuok

    2014-01-01

    A problem pertaining to determination of the concentrated exergy of the asphalt concrete mixture is considered in the paper. The paper shows the possibility to use the concentrated exergy of the asphalt concrete mixture for qualitative energy evaluation of mixing processes.

  15. Utilization of Recycled Concrete Aggregates in Stone Mastic Asphalt Mixtures

    Directory of Open Access Journals (Sweden)

    Mohammad Saeed Pourtahmasb

    2014-01-01

    Full Text Available Recycled concrete aggregate (RCA is considered as one of the largest wastes in the entire world which is produced by demolishing concrete structures such as buildings, bridges, and dams. It is the intention of scientists and researchers, as well as people in authority, to explore waste material recycling for environmental and economic advantages. The current paper presents an experimental research on the feasibility of reusing RCA in stone mastic asphalt (SMA mixtures as a partial replacement of coarse and fine aggregates. The engineering properties of SMA mixtures containing RCA have been evaluated for different percentages of binders based on the Marshall mix design method. The outcomes were statistically analyzed using two-factor analysis of variance (ANOVA. Test results revealed that the performance of SMA mixtures is affected by RCA due to higher porosity and absorption of RCA in comparison with virgin granite aggregates. However, the engineering properties of SMA mixtures containing a particular amount of RCA showed the acceptable trends and could satisfy the standard requirements. Moreover, to achieve desirable performance characteristics, more caution should be made on properties of SMA mixtures containing RCA.

  16. The Study of Water Stability for SBS and Polyacrylate Composite Modified Asphalt Mixture

    Directory of Open Access Journals (Sweden)

    HU Qiusheng

    2014-09-01

    Full Text Available Polyacrylate (Polyacrylate, called PAE is a kind of thermoplastic polymer latex, which is easy to form a waterproof membrane and has greater adhesion ,always be used in concrete to enhance its ability to resist water corrosion.SBS is an inorganic modifier for modified asphalt mixture will help to improve the high and low temperature stability and other road performance, ect.However,its ability to enhanced asphalt mixture’s resistance for water damage is not obvious. In order to research the two composite modified asphalt mixture’s resistance effects to water damage , the Marshall Stability Test and Fort Kentucky Flooding Scattering Experiments were used on asphalt mixtures, SBS modified asphalt mixture and composite modified asphalt mixture and the effect of different composite modified PAE content were studied. The results showed that: PAE can significantly improve the water stability of asphalt mixture, what’s more, with the increase use of PAE,the mass loss rate of asphalt mixture decreases steadily.

  17. 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.

  18. 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...

  19. 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 ...

  20. 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...

  1. The Research on Improvement of Low Temperature Stability for Diatomite Modified Asphalt Mixture with PE Particles

    OpenAIRE

    HU Qiusheng; Zhou, Gang

    2015-01-01

    In light of the lake of low temperature stability for diatomaceous which used as asphalt modifier.Stat the research with the diatomite produced at Jilin Changbai, using the way of low temperature bending test to evaluate the PE and diatomite composite modified asphalt mixture’s low temperature crack resistance performance. The results showed that after the diatomite and PE composite modified asphalt mixture has the best advantage of anti-cracking performance under low-temperature ...

  2. 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.

  3. 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.

  4. Study of normal and shear material properties for viscoelastic model of asphalt mixture by discrete element method

    DEFF Research Database (Denmark)

    Feng, Huan; Pettinari, Matteo; Stang, Henrik

    2015-01-01

    In this paper, the viscoelastic behavior of asphalt mixture was studied by using discrete element method. The dynamic properties of asphalt mixture were captured by implementing Burger’s contact model. Different ways of taking into account of the normal and shear material properties of asphalt mi...

  5. 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...

  6. Influence of ageing on the properties of bitumen from asphalt mixtures with recycled concrete aggregates

    OpenAIRE

    Pasandín, A. R.; Pérez, I.; Oliveira, Joel; Silva, Hugo Manuel Ribeiro Dias da; Pereira, Paulo A. A.

    2015-01-01

    The reuse of recycled concrete aggregates in new hot-mix asphalt can be a more sustainable method of production, but these mixtures may need a heat treatment before compaction to improve their water sensitivity performance. A direct consequence of this treatment is an increase in the hot-mix asphalt resilient modulus. The aim of this paper is to analyse the effect of ageing on the stiffness of asphalt mixtures with different amounts of recycled concrete aggregates, before and after a heat tre...

  7. Background of superpave asphalt mixture design and analysis. National asphalt training center demonstration project 101. Final report, December 1992-November 1994

    Energy Technology Data Exchange (ETDEWEB)

    McGennis, R.B.; Anderson, R.M.; Kennedy, T.W.; Solaimanian, M.

    1995-02-01

    The manual represents the first formal training document that embodies the complete series of SUPERPAVE asphalt mixture design and analysis test equipment and procedures. These tests and procedures represent the results of the SHRP 5-year research effort to investigate and improve asphalt cement technology. This manual was developed under the FHWA`s National Asphalt Training Center. Students attending the center utilize this manual to obtain a better understanding of the underlying theory behind asphalt mixture design and analysis, as well as how to perform each of the new procedures.

  8. Density of asphalt paving mixtures: Measurements, variations, and influencing factors

    International Nuclear Information System (INIS)

    The first part describes the results of a research study to determine the effectiveness of the Troxler Model 4640 Thin Lift Nuclear Density Gauge. The densities obtained from cores and the nuclear density gauge from seven construction projects were compared. A linear regression technique was used to investigate how well the core densities could be predicted from nuclear densities. Correlation coefficients were determined to indicate the degree of correlation between the core and nuclear densities. Using a statistical analysis technique, the range of differences between core and nuclear measurements was established for specified confidence levels for each project. Analysis of the data indicated that the accuracy of this gauge is highly material dependent. While acceptable results were obtained with limestone mixtures, the gauge did not perform satisfactorily with mixtures containing siliceous aggregate. The data presented in this paper indicate that the gauge could be used as a quality control tool provided that a calibration is developed for each project. The maximum theoretical specific gravities of asphalt-aggregate paving mixtures obtained from different methods were compared. The study included experimental work and analysis of the resulting data. The agreement between results obtained from the Texas C-14 method and the Rice method were excellent. Results obtained by backcalculating theoretical maximum densities from a single Rice test were also found to be satisfactory. Theoretical approach based on bulk specific gravity of aggregate is not recommended because of yielding significantly low theoretical maximum specific gravities and high relative densities. The last two parts summarize density levels and corresponding variations obtained from fifty-seven construction projects throughout the state of Texas

  9. Physical and environmental properties of asphalt mixtures containing incinerator bottom ash.

    Science.gov (United States)

    Huang, Chin-Ming; Chiu, Chui-Te; Li, Kung-Cheh; Yang, Wan-Fa

    2006-10-11

    This paper presents parts of the results from a research project sponsored by Taiwan Environmental Protection Administration (TEPA), investigating both the physical and environmental properties of asphalt mixtures using different amount of incinerator bottom ash (IBA) as fine aggregate substitution. The Marshall mix design method was used to determine the design asphalt content and evaluate the potential performance of these IBA-asphalt mixtures. Water sensitivity and wheel track rutting were also performed on these mixtures. Leachates, from both laboratory and outdoor leaching tests, were performed to measure the concentration of selected heavy metals and the level of daphnia toxicity. While with adequate Marshall stability, the IBA-asphalt mixtures were shown to have excessively high Marshall flow and excessively low VMA (voids in the mineral aggregate). The results of the wheel tracking tests also indicated that the IBA-asphalt mixtures had low rutting resistance. The results of the water sensitivity test according to procedure of AASHTO T283 method showed that the IBA-asphalt mixtures had a higher tensile strength ratio (TSR) as compared with the conventional asphalt mixtures. Considering the environmental aspects, outdoor leaching tests showed that IBA had a high level of daphnia toxicity. From an ecological perspective, IBA could be identified as hazardous waste in Taiwan. However, after being mixed with asphalt binder, the concentration of heavy metals and the levels of daphnia toxicity were significantly reduced. The leachates of 10-day flat plate leaching tests on Marshall specimens containing IBA indicated that the heavy metal were undetectable and the daphnia toxicity was ineffective. PMID:16787702

  10. Effect of Short-Term Aging Process on the Moisture Susceptibility of Asphalt Mixtures and Binders Containing Sasobit Warm Mix Additive

    OpenAIRE

    Bo Li; Jinyu Yang; Xiaohui Li; Xiang Liu; Feng Han; Liangying Li

    2015-01-01

    Moisture susceptibility is one of the key issues of warm mix asphalt (WMA). In this research, the moisture susceptibility of asphalt mixtures and binders containing Sasobit warm mix additive was investigated in comparison to that of hot mixture asphalt (HMA) through laboratory aging experiments. The WMA asphalt mixtures were aged in the laboratory at three aging temperatures and times. The moisture susceptibility of the asphalt mixtures was measured through the laboratory immersed Marshall te...

  11. 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.

  12. Microstructure modeling and virtual test of asphalt mixture based on three-dimensional discrete element method

    Institute of Scientific and Technical Information of China (English)

    马涛; 张德育; 张垚; 赵永利; 黄晓明

    2016-01-01

    The objective of this work is to model the microstructure of asphalt mixture and build virtual test for asphalt mixture by using Particle Flow Code in three dimensions (PFC3D) based on three-dimensional discrete element method. A randomly generating algorithm was proposed to capture the three-dimensional irregular shape of coarse aggregate. And then, modeling algorithm and method for graded aggregates were built. Based on the combination of modeling of coarse aggregates, asphalt mastic and air voids, three-dimensional virtual sample of asphalt mixture was modeled by using PFC3D. Virtual tests for penetration test of aggregate and uniaxial creep test of asphalt mixture were built and conducted by using PFC3D. By comparison of the testing results between virtual tests and actual laboratory tests, the validity of the microstructure modeling and virtual test built in this study was verified. Additionally, compared with laboratory test, the virtual test is easier to conduct and has less variability. It is proved that microstructure modeling and virtual test based on three-dimensional discrete element method is a promising way to conduct research of asphalt mixture.

  13. 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.

  14. Investigation of Low Heat Accumulation Asphalt Mixture and Its Impact on Urban Heat Environment.

    Directory of Open Access Journals (Sweden)

    Jianguang Xie

    Full Text Available This study is focused on investigating the effectiveness of low heat accumulation asphalt mixture and its impact on the urban heat environment. Infrared radiation experiments showed that the temperature of the asphalt mixture decreased with the increase in far-infrared radiant material. The results also revealed that, compared to asphalt with 0% far-infrared radiant content, the asphalt material with a certain ratio of far-infrared radiation material had higher stability at high and low temperatures as well as good water absorption capacity. The Marshall stability of the specimen mixed with 6% far-infrared radiant was higher by 12.2% and had a residual stability of up to 98.9%. Moreover, the low-temperature splitting tensile strength of the asphalt mixture with 6% far-infrared radiation material increased by 21.3%. The friction coefficient of the asphalt mixtures with 6% and 12% far-infrared radiation material increased by 17.7% and 26.9%, respectively.

  15. 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...

  16. Development of an autonomous setup for evaluating self healing capability of asphalt mixtures

    OpenAIRE

    Qiu, J.; Molenaar, A.A.A.; Van de Ven, M.F.C.; Wu, S.

    2012-01-01

    It is a well known fact that asphalt mixtures have self healing capabilities. Yet most of the self healing investigations are carried out using complex and time consuming fatigue tests. In order to investigate the self healing capability in a simple and efficient manner, a beam on elastic foundation test setup (BOEF) is proposed in this paper. With a notched asphalt concrete beam fully glued on a low modulus rubber foundation, the BOEF setup is able to control the self healing process autonom...

  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. 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...

  19. 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.

  20. Study of the Internal Mechanical response of an asphalt mixture by 3-D Discrete Element Modeling

    DEFF Research Database (Denmark)

    Feng, Huan; Pettinari, Matteo; Hofko, Bernhard;

    2015-01-01

    In this paper the viscoelastic behavior of asphalt mixture was investigated by employing a three-dimensional Discrete Element Method (DEM). The cylinder model was filled with cubic array of spheres with a specified radius, and was considered as a whole mixture with uniform contact properties for ...

  1. 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.

  2. 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.

  3. 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

  4. Assessments of low emission asphalt mixtures produced using combinations of foaming agents

    Science.gov (United States)

    Mohd Hasan, Mohd Rosli

    The asphalt foaming techniques have been used over the last couple of decades as an alternative to the traditional method of preparing asphalt mixtures. Based on positive feedback from the industry, this study was initiated to explore and evaluate the performance of the Warm Mix Asphalt (WMA) mixture produced through a foaming process using physical and chemical foaming agents, which are ethanol and sodium bicarbonate (NaHCO3), respectively. The success of this project may lead to new theories and provide an environmentally friendly technique to produce asphalt mixtures. This may advance the understanding of the foaming process and improve the performance of WMA to support sustainable development. Theoretically, ethanol can function in the same manner as water but requires less energy to foam due to its lower boiling point, 78°C. During the asphalt foaming process, numerous bubbles were generated by the vaporized ethanol, which significantly increased the volume of the asphalt binder, hence the coating potential of aggregates improves. The sodium bicarbonate was incorporated to enhance the quantity of bubbles and its stability. Therefore, understanding foaming agents, their solubility, chemical reactions, chemical function groups and rheological properties of the foamed binder are essential to help control the foam structure and final properties of the foamed WMA mixture. In order to understand the overall performance of newly developed foaming WMA, this material was evaluated for moisture susceptibility, rutting potential, and resistance to fracture and thermal cracking. The coatability, workability and compactability of foamed asphalt mixtures during production were also evaluated. Based on the results, it was found that the newly proposed foaming WMA has high potential to promote sustainable development by lowering the energy consumption and impacts on the environment. The ethanol is efficient in lowering the viscosity of asphalt binders, enhancing the

  5. Performance Characteristic of Cold Recycled Mixture with Asphalt Emulsion and Chemical Additives

    Directory of Open Access Journals (Sweden)

    Shaowen Du

    2015-01-01

    Full Text Available Three types of chemical additives were used to modify asphalt emulsion recycled mixture. These chemical additives include composite Portland cement (CPC, hydrated lime (HL, and a combination of hydrated lime and ground-granulated blast-furnace slag (GGBF. The influence of different additives on the recycled mixture performance was investigated by volumetric and strength tests, moisture susceptibility test, rutting resistance test, and low temperature bending test. To better understand its performance characteristic, the microstructure images of the recycled mixture were observed by environmental scanning electron microscope (ESEM. Test results demonstrate that the performance improvement of the emulsion recycled mixture depends on the types and content of chemical additives. Several recommendations are presented for the selection of chemical materials. Based on ESEM image analysis, the interface bonding mechanism is proposed to explain the performance characteristic of the recycled mixture with asphalt emulsion and cementitious materials.

  6. Asphalt Concrete Mixtures: Requirements with regard to Life Cycle Assessment

    OpenAIRE

    Jan Mikolaj; Frantisek Schlosser; Lubos Remek; Aurelia Chytcakova

    2015-01-01

    Design of asphalt concrete, required properties of constituent materials and their mixing ratios, is of tremendous significance and should be implemented with consideration given to the whole life cycle of those materials and the final construction. Conformity with requirements for long term performance of embedded materials is the general objective of the Life Cycle Assessment (LCA). Therefore, within the assessment, material properties need to be evaluated with consideration given to the wh...

  7. 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...

  8. 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

  9. 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.

  10. 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.

  11. Development of an autonomous setup for evaluating self healing capability of asphalt mixtures

    NARCIS (Netherlands)

    Qiu, J.; Molenaar, A.A.A.; Van de Ven, M.F.C.; Wu, S.

    2012-01-01

    It is a well known fact that asphalt mixtures have self healing capabilities. Yet most of the self healing investigations are carried out using complex and time consuming fatigue tests. In order to investigate the self healing capability in a simple and efficient manner, a beam on elastic foundation

  12. 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

  13. 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 ...

  14. Characterization of Various Plant-Produced Asphalt Concrete Mixtures Using Dynamic Modulus Test

    Directory of Open Access Journals (Sweden)

    Muhammad Irfan

    2016-01-01

    Full Text Available This research characterizes the performance of various plant-produced asphalt concrete mixtures by dynamic modulus |E∗| test using asphalt mixture performance tester (AMPT. Marshall designed specimens of seven different mixtures were prepared using the Superpave gyratory compactor and subjected to sinusoidal compressive loading at various temperatures (4.4 to 54.4°C and loading frequencies (0.1 to 25 Hz. A catalog of default dynamic modulus values for typical asphalt concrete mixtures of Pakistan was established by developing stress-dependent master curves separately, for wearing and base course mixtures. The sensitivity of temperature and loading frequency on determination of dynamic modulus value was observed by typical isothermal and isochronal curves, respectively. Also, the effects of various variables on dynamic modulus were investigated using statistical technique of two-level factorial design of experiment. Furthermore, two dynamic modulus prediction models, namely, Witczak and Hirsch, were evaluated for their regional applicability. Results indicated that both the Witczak and Hirsch models mostly underpredict the value of dynamic modulus for the selected conditions/mixtures. The findings of this study are envisaged to facilitate the implementation of relatively new performance based mechanistic-empirical structural design and analysis approach.

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

    Directory of Open Access Journals (Sweden)

    Feipeng Xiao

    2010-01-01

    Full Text Available 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 in investigating the cumulative dissipated, stiffness, and fatigue life of rubberized asphalt concrete mixtures containing the WMA additive after a long-term aging process. The aged beams were made with one rubber type (−40 mesh ambient crumb rubber, two aggregate sources, two WMA additives (Asphamin and Sasobit, and tested at 5 and 20ºC. A total of 55 aged fatigue beams were tested in this study. The test results indicated that the addition of crumb rubber extends the fatigue resistance of asphalt binder while WMA additive exhibits a negative effect. The study indicated that the WMA additive generally has an important influence on fatigue life. In addition, test temperature and aggregate source play an important role in determining the cumulative dissipated energy, stiffness, and fatigue life of an aged mixture.

  16. Three-dimensional modeling and simulation of asphalt concrete mixtures based on X-ray CT microstructure images

    Directory of Open Access Journals (Sweden)

    Hainian Wang

    2014-02-01

    Full Text Available X-ray CT (computed tomography was used to scan asphalt mixture specimen to obtain high resolution continuous cross-section images and the meso-structure. According to the theory of three-dimensional (3D reconstruction, the 3D reconstruction algorithm was investigated in this paper. The key to the reconstruction technique is the acquisition of the voxel positions and the relationship between the pixel element and node. Three-dimensional numerical model of asphalt mixture specimen was created by a self-developed program. A splitting test was conducted to predict the stress distributions of the asphalt mixture and verify the rationality of the 3D model.

  17. Fatigue Properties of Layered Double Hydroxides Modified Asphalt and Its Mixture

    Directory of Open Access Journals (Sweden)

    Xing Liu

    2014-01-01

    Full Text Available This study investigated the influence of layered double hydroxides (LDHs on the fatigue properties of asphalt mixture. In this paper, different aging levels (thin film oven test (TFOT and ultraviolet radiation aging (UV aging for short of bitumen modified with various mass ratios of the LDHs were investigated. The TFOT and UV aging process were used to simulate short-term field thermal-oxidative aging and long-term field light UV aging of bitumen, respectively. The influences of LDHs on the fatigue properties of LDHs were evaluated by dynamic shear rheometer (DSR and indirect tensile fatigue test. Results indicated that the introduction of LDHs could change the fatigue properties of bitumen under a stress control mode. The mixture with modified bitumen showed better fatigue resistance than the mixture with base bitumen. The results illustrated that the LDHs would be alternative modifiers used in the bitumen to improve the lifetime of asphalt pavements.

  18. Stiffness modulus of Polyethylene Terephthalate modified asphalt mixture: A statistical analysis of the laboratory testing results

    International Nuclear Information System (INIS)

    Highlights: • Effect of PET modification on stiffness property of asphalt mixture was examined. • Different temperatures and loading amounts were designated. • Statistical analysis was used to find interactions between selected variables. • A good agreement between experimental results and predicted values was obtained. • Optimal amount of PET was calculated to achieve the highest mixture performance. - Abstract: Stiffness of asphalt mixture is a fundamental design parameter of flexible pavement. According to literature, stiffness value is very susceptible to environmental and loading conditions. In this paper, effects of applied stress and temperature on the stiffness modulus of unmodified and Polyethylene Terephthalate (PET) modified asphalt mixtures were evaluated using Response Surface Methodology (RSM). A quadratic model was successfully fitted to the experimental data. Based on the results achieved in this study, the temperature variation had the highest impact on the mixture’s stiffness. Besides, PET content and amount of stress showed to have almost the same effect on the stiffness of mixtures. The optimal amount of PET was found to be 0.41% by weight of aggregate particles to reach the highest stiffness value

  19. Nuclear method for determination of asphalt content corrected for moisture in bituminous mixture. Final report, March 1988-February 1989

    International Nuclear Information System (INIS)

    This report presents results of research on the development of a method for determination of asphalt content corrected for moisture using the nuclear-gauge method. The researchers selected an approach that involved rapid drying of the asphalt concrete samples in a microwave oven prior to the determination of asphalt content using a Troxler Model 3241-C nuclear asphalt-content gauge. As a reference, asphalt contents were also measured using quantitative extraction. In general, good agreement was found between asphalt contents measured by the Troxler Model 3241-C nuclear gauge and asphalt contents measured by quantitative extraction. In extended sampling for Plant 1, no significant increase in nuclear gauge error was seen over a 10-day sampling period, which indicates that daily calibration of the nuclear gauge is probably unnecessary to maintain satisfactory performance. The field demonstration of the procedure of drying the bituminous mixture in a microwave oven and then determining its asphalt content by the nuclear method indicated asphalt-content results were obtained approximately 1 hour faster than results obtained by quantitative extraction

  20. Fatigue Properties of Layered Double Hydroxides Modified Asphalt and Its Mixture

    OpenAIRE

    Xing Liu; Shaopeng Wu; Ling Pang; Yue Xiao; Pan Pan

    2014-01-01

    This study investigated the influence of layered double hydroxides (LDHs) on the fatigue properties of asphalt mixture. In this paper, different aging levels (thin film oven test (TFOT) and ultraviolet radiation aging (UV aging for short)) of bitumen modified with various mass ratios of the LDHs were investigated. The TFOT and UV aging process were used to simulate short-term field thermal-oxidative aging and long-term field light UV aging of bitumen, respectively. The influences of LDHs on t...

  1. Contribution of asphalt rubber mixtures to noise abatement – time effect

    OpenAIRE

    Freitas, Elisabete F.

    2010-01-01

    Wearing course layers with a rubberized asphalt binder have been lately recommended as a measure to mitigate noise. Their acoustical performance in an early age seems to be superior to that shown by conventional layers. Nevertheless, there is no deep knowledge in relation to their behavior throughout their lifetime. The research carried out aims at observing and studying this type of mixes. For this purpose, several road sections with gap-graded mixtures, two of which with rubb...

  2. APPLICATION OF PACKING THEORY ON GRADING DESIGN FOR POROUS ASPHALT MIXTURES

    Directory of Open Access Journals (Sweden)

    Hardiman Hardiman

    2004-01-01

    Full Text Available The design life of porous asphalt is shorter than dense mix as a consequence of permeability loss due to clogging and poor resistance to disintegration. To mitigate problems associated with clogging, double layer porous asphalt has been constructed in the Netherlands. This paper investigated a development of a new grading design for porous asphalt by varying percentage of aggregate with maximum sizes of 20, 14 and 10mm; a theory of packing was used. The most common method used for grading design is based on empirical, which does not relate the packing behaviour of the aggregate mass. The packing theory used in this study was facilitated by a vibratory compactor. It was found that mixtures containing aggregate sizes 14 and 10mm have a good permeability and stability, when vibrated for 65 second with a frequency of 40Hz, while for aggregates containing 20mm, to achieve the requirement for Marshall stability, the gradation needs to be modified. Properties of porous asphalt based on packing theory are better from the empirical grading from Spain (P-12.

  3. Computational microstructure modeling of asphalt mixtures subjected to rate-dependent fracture

    Science.gov (United States)

    Aragao, Francisco Thiago Sacramento

    2011-12-01

    Computational microstructure models have been actively pursued by the pavement mechanics community as a promising and advantageous alternative to limited analytical and semi-empirical modeling approaches. The primary goal of this research is to develop a computational microstructure modeling framework that will eventually allow researchers and practitioners of the pavement mechanics community to evaluate the effects of constituents and mix design characteristics (some of the key factors directly affecting the quality of the pavement structures) on the mechanical responses of asphalt mixtures. To that end, the mixtures are modeled as heterogeneous materials with inelastic mechanical behavior. To account for the complex geometric characteristics of the heterogeneous mixtures, an image treatment process is used to generate finite element meshes that closely reproduce the geometric characteristics of aggregate particles (size, shape, and volume fraction) that are distributed within a fine aggregate asphaltic matrix (FAM). These two mixture components, i.e., aggregate particles and FAM, are modeled, respectively, as isotropic linear elastic and isotropic linear viscoelastic materials and the material properties required as inputs for the computational model are obtained from simple and expedited laboratory tests. In addition to the consideration of the complex geometric characteristics and inelastic behavior of the mixtures, this study uses the cohesive zone model to simulate fracture as a gradual and rate-dependent phenomenon in which the initiation and propagation of discrete cracks take place in different locations of the mixture microstructure. Rate-dependent cohesive zone fracture properties are obtained using a procedure that combines laboratory tests of semi-circular bending specimens of the FAM and their numerical simulations. To address the rate-dependent fracture characteristics of the FAM phase, a rate-dependent cohesive zone model is developed and

  4. Immobilization of heavy metals by asphalt-sulfur sodium hydroxide mixture

    Energy Technology Data Exchange (ETDEWEB)

    Sawada, K.; Ozawa, S.; Matsuda, H. [Nagoya Univ., Research Center for Advanced Waste and Emission Management, Nagoya (Japan); Mizutani, M.; Matsubara, M.; Hidaka, S. [Idemitsu Kosan Co. Ltd., Central Research Laboratories, Chiba (Japan)

    2000-07-01

    Approximately 50 million tons of municipal solid waste is incinerated annually in Japan. The resulting fly ash contains potentially toxic metals originally found in the wastes. A study was conducted to treat fly ash using an asphalt-sulphur-sodium hydroxide mixture. The main objective was to change the metals into metal sulfides to decrease their solubility and then to incorporate the dissoluble components into asphalt to repel water.Sodium sulfide, produced from the reaction, reacts with heavy metals to form metal sulfides insoluble in water. Adding dissoluble components in asphalt physically prevents the leaching of heavy metals from the treated ash. A biaxial kneader at 403 K was used to mix the samples before carrying out the dissolution test. Results indicate that the lead compounds present in the sample fly ash changed into lead sulfide. The amount of lead that was leached from the treated mixture passed Japan's standard for lead emissions which is 0.3 mg/L. It was concluded that this new immobilization method effectively stabilizes lead found in wastes such as fly ash. However, because sodium hydroxide is an expensive chemical, the amounts of additives will have to be optimized for practical use. 6 refs., 4 tabs., 5 figs.

  5. The Use of Steel Works Crushed Slag (Lidonit in the Preparation of Asphalt Mixtures

    Directory of Open Access Journals (Sweden)

    Gh. Gugiuman

    2004-01-01

    Full Text Available The high costs of the quarry crushed aggregates (producer costs to which additional railroad transport costs are taken into account result in the fact that at large distance away from quarry lesser amounts of chippings and crushing sands are provided only. The initiation of the crushed aggregates production manufactured out of steelworks crushed slag. Lidonit, at a competitive delivering price, has led to the first series of laboratory tests. In the first stage two asphalt concrete mixtures were made in cube-shaped and cylinder-shaped (Marshall test-tubes on which physical and mechanical characteristic values are determined. The results of these first tests outlined the real opportunity of using these products in supplying the roads and streets with asphalt mix for pavements.

  6. Neutron thermalization in quality control of asphalts content in mixtures for paving. Adaptation of nuclear densimeters for this purpose

    International Nuclear Information System (INIS)

    This paper shows how the neutron source of the nuclear densimeters, used for measure the humidity, can be used for measuring and making the quality control of the asphalt percentage in mixtures used for street paving. The measures are based in the neutronic thermalization processes, because the hydrogen is the main part of chemical composition of the asphalts. A calibration method for the equipment is presented. (author). 6 refs, 3 figs, 3 tabs

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

    Directory of Open Access Journals (Sweden)

    Nuha Salim Mashaan

    2013-01-01

    Full Text Available 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 were added to SMA mixtures. Indirect tensile stiffness modulus test was conducted at temperatures of 5, 25, and 40°C. Indirect tensile fatigue test was conducted at three different stress levels (2000, 2500, and 3000 N. The results show that the stiffness modulus of reinforced SMA samples containing various contents of CRM is significantly high in comparison with that of nonreinforced samples, and the stiffness modulus of reinforced samples is in fact less severely affected by the increased temperature compared to the nonreinforced samples. Further, the results show that CRM reinforced SMA mixtures exhibit significantly higher fatigue lives compared to the nonreinforced mixtures help in and promotion of sustainable technology by recycling of waste materials in much economical and environmental-friendly manner.

  8. Evaluation of permanent deformation characteristics of unmodified and Polyethylene Terephthalate modified asphalt mixtures using dynamic creep test

    International Nuclear Information System (INIS)

    Highlights: • Waste PET was utilized as modifier in asphalt mixture. • Deformation characteristics of asphalt mixtures were assessed. • Dynamic creep test was conducted at different temperatures and stress levels. • Permanent deformation models were introduced. - Abstract: One of the major types of plastics that can be found in Municipal Solid Waste (MSW) is Polyethylene Terephthalate (PET) which is a non-biodegradable semi-crystalline thermoplastic polymer, and is considered as polyester material. Generating large amount of waste PET, mainly as bottles, would cause environmental hazards by disposing in landfills. This paper aims to evaluate effects of utilizing waste PET flakes as modifier in asphalt mixture as an alternative solution to overcome the potential risks arise from producing large amount of waste PET as well as evaluating the deformation characteristics of unmodified and PET modified asphalt mixtures. To achieve this aim, different percentages of PET were designated for this investigation, namely: 0%, 0.2%, 0.4%, 0.6%, 0.8% and 1% by weight of aggregate particles, and dynamic creep test was performed at different stress levels (300 kPa and 400 kPa) and temperatures (10 °C, 25 °C and 40 °C). Consequently, Zhou three-stage model was developed. The results showed that permanent deformation characteristics of asphalt mixture were considerably improved by utilization of PET modification, when the permanent strain was remarkably decreased in PET modified mixture compared to the conventional mixture at all stress levels and temperatures. Besides, based on Zhou model, it was concluded that elastic and visco-elastic properties of asphalt mixture were improved by application of PET modification

  9. 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

  10. 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.

  11. 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...

  12. Shear Strength Characteristics of Coir Fibre Stabilised Stone Matrix Asphalt Mixtures

    Directory of Open Access Journals (Sweden)

    Bindu S

    2015-09-01

    Full Text Available The triaxial test measures the mix stability in the form of shear strength and gave better information for the prediction of field performance. The stresses acting on the laboratory specimen during the test simulate the state of stresses existing in the pavement. The Stone Matrix Asphalt mixtures (SMAwere investigated using triaxial shear strength testing at 50.8 mm/min ram rate loading at 60°C to investigate the effect of additive, coir fibre on the strength properties by varying  the percentages of fibre. SMA without fibre  is taken as the control mixture. The test was conducted at 0, 50, 75 and 100kPa confinements. The Mohr-Coulomb failure theory was used to analyze the test data and the analysis shows that the SMA stabilized mixtures had highest cohesion and shear strength as compared to the control mixture, but almost similar angle of internal friction value. The higher values of cohesion and shear strength can be associated to a fibre content of 0.3% and the percentage increase in cohesion is about 53% with respect to the control mixture. This shows that the mixture has greater resistance to shearing stresses than the control mixture. There is a trend that the strain at failure increases with increasing confinement pressure, indicating their stress dependent behaviour. The stress-strain curves indicate that the peak stress developed and the time of its occurrence is higher in stabilized mixtures when compared to those of the control mixture. For stabilized mixtures, it is observed that the shape change of the stress-strain curves is more gradual with increase in fibre content and brittle type failure does not seem to occur as in the case of control mixture.

  13. Computed tomography to determine fatigue cracking growth parameters in asphaltic mixtures

    Energy Technology Data Exchange (ETDEWEB)

    Braz, D.; Lopes, R.T. [Universidade Federal, Rio de Janeiro, RJ (Brazil). Coordenacao dos Programas de Pos-graduacao de Engenharia. Lab. de Instrumentacao Nuclear; Motta, L.M.G. [Universidade Federal, Rio de Janeiro, RJ (Brazil). Coordenacao dos Programas de Pos-graduacao de Engenharia. Lab. Geotecnico

    2002-07-01

    Distress of asphalt concrete pavement due to repeated bending from traffic loads has been a well recognized problem in Brazil. There are three primary causes of cracking, namely fatigue cracking, due to the repetitive nature of traffic loading, reflection cracking which results from the presence of a defect which may be a crack or joint in other layers in the pavement, and low temperature cracking which is caused by a rapid and large decrease in ambient temperature. If it is assumed that fatigue cracking growth is governed by the conditions at the crack tip, and that the crack tip conditions can be characterized by the stress intensity factor, then fatigue cracking growth as a function of stress intensity range {delta}K can be determined. Computed tomography technique is used to detect crack evolution in asphaltic mixtures which were submitted to fatigue tests. Fatigue tests under conditions of controlled stress were carried out using diametral compression equipment and repeat loading. The aim of this work is imaging several specimens at different stages of the fatigue tests, i.e., after different numbers of applied blows. In order to obtain the behavior of the crack growth for each specimens to both mixtures graphics were made to represent crack size (c) as a function of the applied loading number (N). A graphical representation of fatigue cracking growth rates (dc/dN) as a function of {delta}K is also presented. (author)

  14. Evaluation and Study the Effect of Additives and Other Factors on Tensile Strength of Asphalt Paving Mixtures

    Directory of Open Access Journals (Sweden)

    Hanaa Khaleel A. Al-Baiti

    2012-03-01

    Full Text Available The resistance of asphaltic concrete to cracking is dependent upon its tensile strength and flexibility characteristics. Also the low tensile strength has recognized as a major contributor to other performance problems. The fatigue life of mixtures decreases exponentially with decreasing of tensile strength. This trend is justified by the loss in stiffness and thereby initiating cracks and stripping. The main objective of this research is intended to study the effect of different variables related with the used materials and the external conditions on the tensile strength and predict a model of indirect tensile strength in asphalt concrete paving materials under the local prevailing conditions and investigate the effect of percent of additives of (Polyestrene resins and Hydrated Lime to enhance the resistance ability of asphalt concrete mixture against distresses. The main affected factors; soaking, asphalt content, compaction, aggregate maximum size and temperature, influence on the indirect tensile strength and presented through a statistics analysis model for tensile strength in asphalt mixture

  15. Surface modification of basalt with silane coupling agent on asphalt mixture moisture damage

    International Nuclear Information System (INIS)

    Graphical abstract: - Highlights: • A new silane coupling agent was synthesized based on KH570. • Basalt surface was modified using the new silane coupling agent. • Chemical bond between basalt and the new silane coupling agent was formed. • Asphalt mixture which used modified basalt show superior water stability. - Abstract: A new silane coupling agent was synthesized based on γ-(methacryloyloxy) propyltrimethoxysilane (KH570). The surface of basalt rocks was modified by KH570 and the new silane coupling agent (NSCA), and the interfacial interaction between silane coupling agent and basalt was also studied. Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS) analysis showed that the silane coupling agent molecule bound strongly with basalt rocks. Scanning electronic microscopy (SEM) observation showed that a thin layer of coupling agent was formed on the surface of modified basalt. The boiling test and immersion Marshall test confirmed that the moisture sensitivity of basalt modified with the new silane coupling agent increased more significantly than that untreated and treated with KH570. The Retained Marshall Strength of basalt modified with the new coupling agent increased from 71.74% to 87.79% compared with untreated basalt. The results indicated that the new silane coupling agent played an important role in improving the interfacial performance between basalt and asphalt

  16. Research on fatigue cracking growth parameters in asphaltic mixtures using computed tomography

    Energy Technology Data Exchange (ETDEWEB)

    Braz, D. E-mail: delson@lin.ufrj.br; Lopes, R.T.; Motta, L.M.G

    2004-01-01

    Distress of asphalt concrete pavement due to repeated bending from traffic loads has been a well-recognized problem in Brazil. If it is assumed that fatigue cracking growth is governed by the conditions at the crack tip, and that the crack tip conditions can be characterized by the stress intensity factor, then fatigue cracking growth as a function of stress intensity range {delta}K can be determined. Computed tomography technique is used to detect crack evolution in asphaltic mixtures which were submitted to fatigue tests. Fatigue tests under conditions of controlled stress were carried out using diametral compression equipment and repeat loading. The aim of this work is imaging several specimens at different stages of the fatigue tests. In preliminary studies it was noted that the trajectory of a crack was influenced by the existence of voids in the originally unloaded specimens. Cracks would first be observed in the central region of a specimen, propagating in the direction of the extremities. Analyzing the graphics, that represent the fatigue cracking growth (dc/dN) as a function of stress intensity factor ({delta}K), it is noticed that the curve has practically shown the same behavior for all specimens at the same level of the static tension rupture stress. The experimental values obtained for the constants A and n (of the Paris-Erdogan Law) present good agreement with the results obtained by Liang and Zhou.

  17. Surface modification of basalt with silane coupling agent on asphalt mixture moisture damage

    Energy Technology Data Exchange (ETDEWEB)

    Min, Yahong; Fang, Ying; Huang, Xiaojun; Zhu, Yinhui; Li, Wensheng [College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082 (China); Yuan, Jianmin [College of Materials Engineering, Hunan University, Changsha, 410082 (China); Tan, Ligang [College of Mechanical and Vehicle Engineering, Hunan University, Changsha, 410082 (China); Wang, Shuangyin [State Key Laboratory of Chem/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082 (China); Wu, Zhenjun, E-mail: wooawt@163.com [College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082 (China)

    2015-08-15

    Graphical abstract: - Highlights: • A new silane coupling agent was synthesized based on KH570. • Basalt surface was modified using the new silane coupling agent. • Chemical bond between basalt and the new silane coupling agent was formed. • Asphalt mixture which used modified basalt show superior water stability. - Abstract: A new silane coupling agent was synthesized based on γ-(methacryloyloxy) propyltrimethoxysilane (KH570). The surface of basalt rocks was modified by KH570 and the new silane coupling agent (NSCA), and the interfacial interaction between silane coupling agent and basalt was also studied. Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS) analysis showed that the silane coupling agent molecule bound strongly with basalt rocks. Scanning electronic microscopy (SEM) observation showed that a thin layer of coupling agent was formed on the surface of modified basalt. The boiling test and immersion Marshall test confirmed that the moisture sensitivity of basalt modified with the new silane coupling agent increased more significantly than that untreated and treated with KH570. The Retained Marshall Strength of basalt modified with the new coupling agent increased from 71.74% to 87.79% compared with untreated basalt. The results indicated that the new silane coupling agent played an important role in improving the interfacial performance between basalt and asphalt.

  18. Design and Construction of a Full-Scale Test Section with Asphalt Rubber Gap-Graded Wearing Course Mixture

    OpenAIRE

    Riviera, Pier Paolo; Ruffino, Barbara; Fiore, Silvia; Santagata, Ezio; Lanotte, Michele Antonio; Dalmazzo, Davide; Zanetti, Mariachiara

    2012-01-01

    A full-scale test section with asphalt rubber gap-graded wearing course mixture was designed and constructed on a major infrastructure as part of a regional research and implementation project. Standard and performance-related laboratory tests were carried out in order to select constituent materials, define the job-mix formula and monitor construction operations. Gaseous emissions of the bituminous mixture sampled during laying were analyzed to assess the potential risks to which labourers a...

  19. 温拌橡胶沥青混合料施工温度的确定%Determining on Construction Temperature of Warm Rubberized Asphalt Mixture

    Institute of Scientific and Technical Information of China (English)

    蔡骏; 葛折圣; 袁俊

    2011-01-01

    Warm mix asphalt technology was used to improve rubberized asphalt mixture properties at construction temperature. Viscosity-temperature curve of warm rubberized asphalt binder and properties of mixture are test.Construction temperature affection on warm rubberized asphalt binder and properties of mixture was analyzed. Then construction temperature of warm rubberized asphalt mixture was decided. Results showed that construction temperature of warm rubberized asphalt mixture could be 30℃ lower than that of rubberized asphalt mixture.%利用温拌技术改善橡胶沥青的施工性能.通过测定温拌橡胶沥青的粘温曲线和混合料的体积指标,分析了施工温度对橡胶沥青及混合料性能的影响,从而确定了温拌橡胶沥青的施工温度.结果表明,添加温拌剂后,橡胶沥青混合料的施工温度可以降低30℃.

  20. Validation of a dynamic modulus predictive equation on the basis of spanish asphalt concrete mixtures

    Directory of Open Access Journals (Sweden)

    Mateos, A.

    2015-03-01

    Full Text Available Dynamic modulus is defined as the ratio of peak cyclic stress to peak cyclic strain under harmonic loading. It is one of the most important properties of asphalt mixtures, since it determines the strain response characteristics as a function of loading rate and temperature. Different simplified models exist that can predict this variable from mixture composition and binder rheological data, with Witczak and Hirsh models being the most widely accepted. These models have been evaluated in the present study, on the basis of 352 data points from eight asphalt concrete mixtures that were tested between −5 and 60 °C. A new model is also formulated which improves predictions of the previous ones for Spanish mixtures, even though it is a relatively simple equation that requires very limited binder rheological data compared to Witczak and Hirsch models.El módulo dinámico es la relación entre los picos de tensión y deformación bajo carga armónica. Es una de las propiedades más importantes de las mezclas bituminosas, ya que determina la respuesta deformacional en función de la velocidad de carga y la temperatura. Existen diferentes modelos simplificados que permiten predecir esta variable a partir de la composición de la mezcla y de las características reológicas del betún, siendo los de Witczak y el de Hirsch los más ampliamente aceptados. Dichos modelos han sido evaluados en el presente estudio a partir de 352 puntos procedentes de ocho mezclas tipo hormigón bituminoso que fueron ensayadas entre −5 y 60 °C. Así mismo, se ha formulado un nuevo modelo que mejora las predicciones de los anteriores para las mezclas españolas, aun tratándose de una ecuación relativamente simple que requiere una mínima información reológica del betún en comparación con los modelos de Witczak y Hirsch.

  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. APPLICATION OF PACKING THEORY ON GRADING DESIGN FOR POROUS ASPHALT MIXTURES

    OpenAIRE

    Hardiman Hardiman

    2004-01-01

    The design life of porous asphalt is shorter than dense mix as a consequence of permeability loss due to clogging and poor resistance to disintegration. To mitigate problems associated with clogging, double layer porous asphalt has been constructed in the Netherlands. This paper investigated a development of a new grading design for porous asphalt by varying percentage of aggregate with maximum sizes of 20, 14 and 10mm; a theory of packing was used. The most common method used for grading des...

  3. Recycled tyre rubber modified bitumens for road asphalt mixtures: a literature review

    OpenAIRE

    Lo Presti, Davide

    2013-01-01

    Nowadays, only a small percentage of waste tyres are being land-filled. The Recycled Tyre Rubber is being used in new tyres, in tyre-derived fuel, in civil engineering applications and products, in moulded rubber products, in agricultural uses, recreational and sports applications and in rubber modified asphalt applications. The benefits of using rubber modified asphalts are being more widely experienced and recognized, and the incorporation of tyres into asphalt is likely to increase. The te...

  4. Characterization and design of asphalt mixtures with asphaltites from Boyacá for use in low traffic volume roads

    Science.gov (United States)

    Manrique-Espindola, R.

    2013-11-01

    The high availability of asphaltites in Boyacá and their low cost make this material a viable alternative for low traffic road paving; nevertheless, the traditional way in which this material is used generates, in cases, pavements with deficient behavior. This investigation, presents the results of the mixture design using asphaltites from the municipality of Pesca-Boyacá as well as coarse and fine aggregates produced in the region, 70-80 asphalt cement and slow-break asphalt emulsion. Working formulas for dense mixing in hot and cold and particularly MDF-2 and MDC-2 are presented from the characterization information; as benchmarks to define technical viability for use in low- traffic volume roads, according to NT1 regulation from INVIAS. The mixture design was performed according to the procedures defined in the RAMCODES and MARSHALL methodologies.

  5. Investigation of fatigue properties of granite asphalt mixtures containing hydrated lime

    Science.gov (United States)

    Wu, Shaopeng; Huang, Xu

    2010-03-01

    This paper presents the results of a laboratory study of evaluating the fatigue characteristics of granite asphalt mixtures (GAM) using different testing methods. In the study, the fatigue performances of GAM were evaluated with Superpave indirect tensile test (IDT) and four-point beam fatigue test. Specimens were conditioned by four different methods: (1) one cycle of freeze-thaw (F-T), (2) two cycles of F-T, (3) immersion in 60°C water bath for 30min (4) immersion in 60°C water bath for 48h, and contrastive analysis was made with unconditioned specimens. Investigation of moisture damage influence on the fatigue properties of GAM with and without Hydrated Lime (HL) was done. The results from this study indicated that both Superpave IDT and four-point beam fatigue test agreed with each other in ranking the fatigue property of GAM. Increasing F-T cycles or immersion time would decrease fatigue life in GAM, and the addition of HL was effective to prolong the fatigue life in GAM.

  6. Evaluation of Permanent Deformation of Unmodified and Rubber-Reinforced SMA Asphalt Mixtures Using Dynamic Creep Test

    OpenAIRE

    Herda Yati Katman; Mohd Rasdan Ibrahim; Mohamed Rehan Karim; Nuha Salim Mashaan; Suhana Koting

    2015-01-01

    This paper presents the evaluation of permanent deformation of rubber-reinforced SMA asphalt mixtures by using dynamic creep test. The effect of trans-polyoctenamer as a cross-linking agent in permanent deformation of rubberized mixtures was also evaluated. Dynamic creep test was conducted at different stress levels (200 kPa, 400 kPa) and temperatures (40°C, 50°C). Permanent deformation parameters such as dynamic creep curve, ultimate strain, and creep strain slope (CSS) were used to analyse ...

  7. Quantitative evaluation of rejuvenators to restore embrittlement temperatures in oxidized asphalt mixtures using acoustic emission

    Science.gov (United States)

    Sun, Zhe; Farace, Nicholas; Arnold, Jacob; Behnia, Behzad; Buttlar, William G.; Reis, Henrique

    2015-03-01

    Towards developing a method capable to assess the efficiency of rejuvenators to restore embrittlement temperatures of oxidized asphalt binders towards their original, i.e., unaged values, three gyratory compacted specimens were manufactured with mixtures oven-aged for 36 hours at 135 °C. In addition, one gyratory compacted specimen manufactured using a short-term oven-aged mixture for two hours at 155 °C was used for control to simulate aging during plant production. Each of these four gyratory compacted specimens was then cut into two cylindrical specimen 5 cm thick for a total of six 36-hour oven-aged specimens and two short term aging specimens. Two specimens aged for 36 hours and the two short-term specimens were then tested using an acoustic emission approach to obtain base acoustic emission response of short-term and severely-aged specimens. The remaining four specimens oven-aged for 36 hours were then treated by spreading their top surface with rejuvenator in the amount of 10% of the binder by weight. These four specimens were then tested using the same acoustic emission approach after two, four, six, and eight weeks of dwell time. It was observed that the embrittlement temperatures of the short-term aged and severely oven-aged specimens were -25 °C and - 15 °C, respectively. It was also observed that after four weeks of dwell time, the rejuvenator-treated samples had recuperated the original embrittlement temperatures. In addition, it was also observed that the rejuvenator kept acting upon the binder after four weeks of dwell time; at eight weeks of dwell time, the specimens had an embrittlement temperature about one grade cooler than the embrittlement temperature corresponding to the short-term aged specimen.

  8. Dynamic Modulus Test Analysis of Sulfur Modified Asphalt Mixture%硫磺改性沥青混合料的动态模量试验分析

    Institute of Scientific and Technical Information of China (English)

    侯睿; 郭忠印

    2013-01-01

    UTM system was used to test asphalt mixture's dynamic modulus with different sulfur contents (by mass).The influences of temperature,loading frequency and sulfur content on the viscoelastic properties of asphalt mixtures were analyzed.The results show that the temperature and loading frequency have the same influence on dynamic modulus of both sulfur modified asphalt mixture and conventional asphalt mixture.The effect of sulfur contents on viscoelastic properties of asphalt mixtures is different.A small quantity of sulfur will increase asphalt mixture's viscosity and temperature sensitivity,but a large quantity of sulfur will increase asphalt mixture's elasticity and reduce temperature sensitivity.%采用UTM系统对不同硫磺掺量(质量比)的沥青混合料进行动态模量试验,分析了温度、加载频率和硫磺掺量对沥青混合料黏弹特性的影响.结果表明:温度和加载频率对硫磺改性沥青混合料和普通沥青混合料动态模量的影响规律基本相同;不同硫磺掺量对沥青混合料黏弹性能的影响有所不同,硫磺掺量较小时,沥青混合料的黏性增加,温度敏感性增大;硫磺掺量较大时,沥青混合料的弹性增加,温度敏感性降低.

  9. Use of rubber crumb for preparation of asphalt-concrete mixtures

    Directory of Open Access Journals (Sweden)

    Yerbol Tileuberdi

    2012-03-01

    Full Text Available In this article use of rubber crumb from spent tire for preparation of rubber-bitumen compounds is investigated. Then the rubber-bitumen compositions are used in composition of asphalt concrete mixes .

  10. Use of rubber crumb for preparation of asphalt-concrete mixtures

    OpenAIRE

    Yerbol Tileuberdi; S. Kozbakarova; Yerdos Ongarbayev; B. Tuleutaev; Zulkhair Mansurov

    2012-01-01

    In this article use of rubber crumb from spent tire for preparation of rubber-bitumen compounds is investigated. Then the rubber-bitumen compositions are used in composition of asphalt concrete mixes .

  11. A Study on the Rheological Properties of Recycled Rubber-Modified Asphalt Mixtures

    OpenAIRE

    Murat Karacasu; Volkan Okur; Arzu Er

    2015-01-01

    Using waste rubber in asphalt mixes has become a common practice in road construction. This paper presents the results of a study on the rheological characteristics of rubber-modified asphalt (RMA) concrete under static and dynamic loading conditions. A number of static and dynamic creep tests were conducted on RMA mix specimens with different rubber sizes and contents, and a series of resonant column tests were conducted to evaluate the shear modulus and damping values. To simulate the stres...

  12. Superpave与Marshall沥青混合料设计方法的探讨%Discussion on Design Method of Superpave and Marshall Asphalt Mixture

    Institute of Scientific and Technical Information of China (English)

    李晓明

    2012-01-01

    从沥青混合料的级配、试件成型方法、油石比的确定等方面,探讨了Superpave与Marshall设计方法的特点。%The features of design methods of Superpave and Marshall are discussed from aspects of grading of asphalt mixture, test specimen molding method, and determination of asphalt aggregate ratio and so on.

  13. Research on Road Performance of Desulfurized Rubber Asphalt and Mixture%脱硫橡胶沥青及其混合料性能研究

    Institute of Scientific and Technical Information of China (English)

    张小利; 张文刚; 杜旭斌

    2013-01-01

    In order to discuss the road performance of desulfurized rubber asphalt and mixture,swelling mechanism of desulfurized rubber asphalt was studied first,and then performance testing of KLMY90#,normal rubber asphalt and desulfurized rubber asphalt were taken,after that,penetration,shear strength and cohesive strength of desulfurized rubber asphalt mortar were test,road performance of desulfurized rubber asphalt mixture were test at last.The study show that,there is no rubber particle core,but lots of chemical reaction in desulfurized rubber asphalt; the performance of desulfurized rubber asphalt is better than normal rubber asphalt without high viscosity.Easy isolation and poor high temperature storage stability; shear strength and cohesive strength of desulfurized rubber asphalt mortar is better; and desulfurized rubber asphalt mixture have good road performance.%为了研究脱硫橡胶沥青及其混合料的性能,研究首先对脱硫橡胶沥青的溶胀机理与溶胀特点展开研究,其次对脱硫橡胶沥青与KLMY90#基质沥青、普通橡胶沥青(40目)进行性能对比性试验,再对脱硫橡胶沥青胶浆的锥入度、抗剪强度、粘结强度进行试验研究,最终对脱硫橡胶沥青混合料的路用性能进行检测.研究结果表明:脱硫橡胶沥青中不存在橡胶颗粒核心且溶胀过程中伴有大量的化学反应;脱硫橡胶沥青各项性能均优于普通橡胶沥青,且克服了普通橡胶沥青高黏度、易离析、高温贮存稳定性差等缺点;脱硫橡胶沥青胶浆抗剪强度大、与矿料粘结力强;脱硫橡胶沥青混合料具有良好的路用性能.

  14. 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.

  15. 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

  16. 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

  17. LOT, a meso scale mechanistic tool for Porous Asphalt mixture design; winter damage and LOT validation

    NARCIS (Netherlands)

    Huurman, M.; Mo, L.T.; Woldekidan, M.F.

    2010-01-01

    By assignment of the Centre for Transport and Navigation (DVS) of the Dutch Ministry of Transport, Public Works and Water Management the Delft University of Technology developed LOT. LOT is a Lifetime Optimisation Tool for Porous Asphalt, PA, based on meso scale structural modelling. LOT sees an asp

  18. A Study on Design and Properties of Epoxy Asphalt Mixtures%环氧沥青混合料设计及性能研究

    Institute of Scientific and Technical Information of China (English)

    丛培良; 陈拴发; 陈华鑫

    2012-01-01

    采用体积设计方法,研究了环氧沥青混合料级配组成和成型前后养护时间对混合料性能的影响.试验结果表明:采用体积设计方法设计的环氧沥青混合料粗集料多,空隙率小,保证了环氧沥青混合料具有良好的抗滑性和抗渗性能.环氧沥青混合料成型前后养护时间影响试件的空隙率、矿料间隙率、沥青饱和度、稳定度和劈裂强度.成型前经过养护的环氧沥青混合料,成型后初始稳定度和劈裂强度比成型前未经过养护的高;但成型前经过养护试件的最终稳定度和劈裂强度低于成型前未经过养护的试件.而且,环氧沥青混合料在60℃养护7d后,已经具有良好的抗水损害性能和抗车辙性能.%Epoxy asphalt mixture is prepared using volume design methods. The effect of curing condition before and after modeled on properties of epoxy asphalt mixture and mixture composition are investigated. The results indicate that epoxy asphalt mixture consist of high coarse aggregate content and low void using volume design method. It can ensure mixture keeping better skid resistance and permeability resistance. The void, voids in mineral aggregate, voids filled with asphalt, Marshall stability and indirect tensile strength of epoxy asphalt mixture increase when mixture is deposited in oven before modeled. But Marshall stability and indirect tensile strength of deposited1 mixture are lower than that of no deposited before modeled. And epoxy asphalt mixture has better water damage resistance and rut resistance when epoxy asphalt mixture is cured 7 day at 60℃.

  19. 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.

  20. 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...

  1. The use of crumb rubber in asphalt mixtures using the dry process

    OpenAIRE

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

    2005-01-01

    The modification process of hot mix asphalts in which crumb rubber is initially mixed with the mineral aggregates before the addition of the binder is known as dry process. This process has as main advantages the use of conventional mixing plants and, at least in principle, has no limitation of the incorporated rubber content. The aim of this paper is to study the influence of the incorporated crumb rubber content in the mechanical behavior of dense graded mixes ( grade envelop...

  2. A study on the rheological properties of recycled rubber-modified asphalt mixtures.

    Science.gov (United States)

    Karacasu, Murat; Okur, Volkan; Er, Arzu

    2015-01-01

    Using waste rubber in asphalt mixes has become a common practice in road construction. This paper presents the results of a study on the rheological characteristics of rubber-modified asphalt (RMA) concrete under static and dynamic loading conditions. A number of static and dynamic creep tests were conducted on RMA mix specimens with different rubber sizes and contents, and a series of resonant column tests were conducted to evaluate the shear modulus and damping values. To simulate the stress-strain response of traffic-induced loading, the measurements were taken for different confining pressures and strain levels. The results of the study indicated that rubber modification increases stiffness and damping ratio, making it a very attractive material for use in road construction. However the grain size of the rubber is very important. Although RMA may cost up to 100% more than regular asphalt, the advantages it brings, such as an increased service life of the road and proper waste utilization contributing to a more sustainable infrastructure, may justify the added cost. PMID:25695096

  3. A Study on the Rheological Properties of Recycled Rubber-Modified Asphalt Mixtures

    Directory of Open Access Journals (Sweden)

    Murat Karacasu

    2015-01-01

    Full Text Available Using waste rubber in asphalt mixes has become a common practice in road construction. This paper presents the results of a study on the rheological characteristics of rubber-modified asphalt (RMA concrete under static and dynamic loading conditions. A number of static and dynamic creep tests were conducted on RMA mix specimens with different rubber sizes and contents, and a series of resonant column tests were conducted to evaluate the shear modulus and damping values. To simulate the stress-strain response of traffic-induced loading, the measurements were taken for different confining pressures and strain levels. The results of the study indicated that rubber modification increases stiffness and damping ratio, making it a very attractive material for use in road construction. However the grain size of the rubber is very important. Although RMA may cost up to 100% more than regular asphalt, the advantages it brings, such as an increased service life of the road and proper waste utilization contributing to a more sustainable infrastructure, may justify the added cost.

  4. Analysis of the Influence of the Modernized Bitumen Batching System on the Composition of the Hot Mix Asphalt Mixture

    Directory of Open Access Journals (Sweden)

    Justas Bražiūnas

    2011-04-01

    Full Text Available The weighted mass of a binder in the bucket of the bitumen batcher of a batch-type asphalt plant should be such that its percentage of hot mix asphalt (HMA mixture lot would comply with the design amount of the job-mix formula in all mix batches. A bitumen batcher does not always weigh bitumen portions precisely. Their mass deviations from the amount determined by the project and its variation impair HMA composition and performance. The paper provides data on a statistical evaluation of bitumen batcher modernization performed at Lithuanian enterprise „LL“. The article analyzes differences in the structures of reconstructed and not reconstructed bitumen batching systems and presents methods for determining modernization effectiveness. The paper also focuses on the effectiveness of the batching system, determining deviations from bitumen content in subsamples taken and extracted everyday during two seasons (before and after batcher‘s modernization of producing HMA from the value of job-mix formula and comparing them to the values of tolerances.Article in Lithuanian

  5. Experimental study on creep properties of crumb rubber modified asphalt mixture under low temperature%胶粉改性沥青混合料低温特性试验研究

    Institute of Scientific and Technical Information of China (English)

    郝俊杰

    2014-01-01

    为研究胶粉改性沥青混合料低温抗裂性能,采用沥青混合料小梁弯曲蠕变试验对胶粉改性沥青混合料的低温性能进行检验,并以 SBS 改性沥青混合料作为参照,结果表明,胶粉改性沥青混合料的感温性较弱,材料力学性能受温度影响较小,与 SBS 改性沥青混合料相比低温不易开裂。%The paper researches the crack resistance of crumb rubber modified asphalt mixture under low temperature,detects the low tempera-ture performance of crumb modified asphalt mixture by adopting the asphalt mixture small beam bending creep test,and compared with SBS mod-ified asphalt mixture. The results show that:the temperature sensitivity of crumb rubber modified asphalt mixture is less sensitive by taking SBS modified asphalt mixture as the reference,so its mechanical properties is less sensitive to temperature,and the crumb rubber modified asphalt mixture is not easy to crack.

  6. 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...

  7. Use of plastic waste (poly-ethylene terephthalate) in asphalt concrete mixture as aggregate replacement.

    Science.gov (United States)

    Hassani, Abolfazl; Ganjidoust, Hossein; Maghanaki, Amir Abedin

    2005-08-01

    One of the environmental issues in most regions of Iran is the large number of bottles made from poly-ethylene terephthalate (PET) deposited in domestic wastes and landfills. Due to the high volume of these bottles, more than 1 million m3 landfill space is needed for disposal every year. The purpose of this experimental study was to investigate the possibility of using PET waste in asphalt concrete mixes as aggregate replacement (Plastiphalt) to reduce the environmental effects of PET disposal. For this purpose the mechanical properties of plastiphalt mixes were compared with control samples. This study focused on the parameters of Marshall stability, flow, Marshall quotient (stability-to-flow ratio) and density. The waste PET used in this study was in the form of granules of about 3 mm diameter which would replace (by volume) a portion of the mineral coarse aggregates of an equal size (2.36-4.75 mm). In all prepared mixes the determined 6.6% optimum bitumen content was used. In this investigation, five different percentages of coarse aggregate replacement were used. The results showed that the aggregate replacement of 20% by volume with PET granules would result in a reduction of 2.8% in bulk compacted mix density. The value of flow in the plastiphalt mix was lower than that of the control samples. The results also showed that when PET was used as partial aggregate replacement, the corresponding Marshall stability and Marshall quotient were almost the same as for the control samples. According to most of specification requirement, these results introduce an asphalt mix that has properties that makes it suitable for practical use and furthermore, the recycling of PET for asphalt concrete roads helps alleviate an environmental problem and saves energy. PMID:16200982

  8. Research on high-temperature performance of rubber asphalt and its mixture%橡胶沥青及其混合料高温性能研究

    Institute of Scientific and Technical Information of China (English)

    马泽军; 肖启劲

    2014-01-01

    从橡胶沥青及混合料的高温性能入手,采用针入度、软化点、135℃粘度评价橡胶沥青高温性能,并采用车辙试验分析橡胶沥青混合料的高温性能,试验结果表明:橡胶粉能够显著改善橡胶沥青及混合料的高温性能。%Starting from high-temperature performance of rubber asphalt and mixture,the article estimates high-temperature performance of rubber asphalt by penetrometer,softening point and 135℃ viscosity,and analyzes the high-temperature performance of rubber asphalt mixture by applying wheel tracking test. The experimental results show that:rubber power can improve the high-temperature performance of rubber asphalt and mixture.

  9. 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)

  10. Evaluation of Permanent Deformation of Unmodified and Rubber-Reinforced SMA Asphalt Mixtures Using Dynamic Creep Test

    Directory of Open Access Journals (Sweden)

    Herda Yati Katman

    2015-01-01

    Full Text Available This paper presents the evaluation of permanent deformation of rubber-reinforced SMA asphalt mixtures by using dynamic creep test. The effect of trans-polyoctenamer as a cross-linking agent in permanent deformation of rubberized mixtures was also evaluated. Dynamic creep test was conducted at different stress levels (200 kPa, 400 kPa and temperatures (40°C, 50°C. Permanent deformation parameters such as dynamic creep curve, ultimate strain, and creep strain slope (CSS were used to analyse the results. Finally, the creep behaviour of the specimens was estimated by the Zhou three-stage creep model. The results show that crumb rubber and trans-polyoctenamer significantly affected the parameters especially at high stress and temperatures. Consistent findings were observed for all permanent deformation parameters. Moreover, based on Zhou model, it was concluded that resistance to permanent deformation was improved by application of crumb rubber and trans-polyoctenamer.

  11. Research on Durability of Granulated Crumb Rubber Asphalt Mixture and Improvement Measures%橡胶颗粒沥青混合料的耐久性及改善措施研究

    Institute of Scientific and Technical Information of China (English)

    孟会林

    2016-01-01

    Based on freeze -thaw split test and Cantabro stripping test after multiple curing cycles and short-time ageing of mixture,this paper studies durability of asphalt mixture mixed with 2.5% rubber crumbs (No.70 asphalt),proposes a technical solution to add aluminate coupling agent (ASA)to improve durability of granulated crumb rubber asphalt mixture,and compares performance indices of granulated scrub rubber asphalt mixture of No.70 asphalt with those of granulated crumb rubber asphalt mixture of SBS modified asphalt.The results show that the granulated crumb rubber asphalt mixture has perfect durability,and ASA can effectively improve long-term stability of the granulated crumb rubber asphalt mixture against scattering loss;the effectiveness of SBS modified asphalt with high viscosity to improve durability of the granulated crumb rubber asphalt mixture is to be verified;and it is necessary to further discuss the rationality of evaluating durability of the granulated crumb rubber asphalt mixture via short-time ageing test.%通过多养护循环及混合料短期老化后的冻融劈裂和肯塔堡飞散试验,对掺入2.5%橡胶颗粒沥青混合料(70号沥青)的耐久性进行研究,提出添加铝酸酯偶联剂(ASA)来提高橡胶颗粒沥青混合料耐久性的技术措施,并将70号沥青橡胶颗粒沥青混合料与SBS改性沥青橡胶颗粒沥青混合料的性能指标进行对比.结果表明:橡胶颗粒沥青混合料具有良好的耐久性,ASA能有效提高橡胶颗粒沥青混合料抗飞散损失的长期稳定性;采用粘度较大的SBS改性沥青对提高橡胶颗粒沥青混合料耐久性的有效性有待验证;短期老化试验评价橡胶颗粒沥青混合料耐久性的合理性有必要进一步讨论.

  12. 间断级配橡胶沥青混合料设计与性能分析%Design of Interrupted Grade Rubber Asphalt Mixture and Analysis of Performance

    Institute of Scientific and Technical Information of China (English)

    许勇; 张强; 王传峰

    2009-01-01

    橡胶沥青混合料是指采用橡胶沥青作为结合料与集料加热拌和而得到的一种沥青混合料.该文首先阐述了橡胶沥青混合料设计的主要问题是选择何种级配来适应粘度大且包含着大量橡胶颗粒的橡胶沥青结合料.接着分析了各种级配对橡胶沥青的适应性,并采用马歇尔试验方法完成了间断级配橡胶沥青混合料的设计.最后对其路用性能进行了测试分析.%The rubber asphalt mixture is an asphalt mixture by taking the rubber asphalt as the bonding material to be heated and mixed with the aggregates. The article firstly sets forth the main problem in the design of rubber asphalt mixture, and that is to select which grade for suiting the high viscosity and mass rubber grain of rubber asphalt bonding material. The article analyzes the adaptability of various grades on the rubber asphalt, and uses Masher test method to complete the design of interrupted grade rubber asphalt mixture, and finally carries out the test analysis of its road performance.

  13. Surface modification of basalt with silane coupling agent on asphalt mixture moisture damage

    Science.gov (United States)

    Min, Yahong; Fang, Ying; Huang, Xiaojun; Zhu, Yinhui; Li, Wensheng; Yuan, Jianmin; Tan, Ligang; Wang, Shuangyin; Wu, Zhenjun

    2015-08-01

    A new silane coupling agent was synthesized based on γ-(methacryloyloxy) propyltrimethoxysilane (KH570). The surface of basalt rocks was modified by KH570 and the new silane coupling agent (NSCA), and the interfacial interaction between silane coupling agent and basalt was also studied. Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS) analysis showed that the silane coupling agent molecule bound strongly with basalt rocks. Scanning electronic microscopy (SEM) observation showed that a thin layer of coupling agent was formed on the surface of modified basalt. The boiling test and immersion Marshall test confirmed that the moisture sensitivity of basalt modified with the new silane coupling agent increased more significantly than that untreated and treated with KH570. The Retained Marshall Strength of basalt modified with the new coupling agent increased from 71.74% to 87.79% compared with untreated basalt. The results indicated that the new silane coupling agent played an important role in improving the interfacial performance between basalt and asphalt.

  14. Research on high temperature stability of including salt anti-freezing asphalt mixture%蓄盐类抑制冻结沥青混合料高温性能研究

    Institute of Scientific and Technical Information of China (English)

    钟科

    2014-01-01

    In order to evaluate the high temperature performance of including salt anti-freezing asphalt mixture,ordinary asphalt mixture,anti-freezing asphalt mixture and anti-freezing asphalt mixture with rubber particles were chosen to carry out high temperature rutting test and immer-sion rutting test. The results show that whether there is the role of water or not,anti-freezing asphalt mixture with rubber particles shows more ex-cellent high temperature performance,compared with other two asphalt mixture.%为了研究蓄盐类抑制冻结沥青混合料的高温抗车辙性能,选取普通沥青混合料、抑制冻结沥青混合料及掺橡胶颗粒的抑制冻结沥青混合料,分别进行干法车辙试验和浸水车辙试验,结果表明:无论干法车辙或是浸水车辙,掺橡胶颗粒的抑制冻结沥青混合料都拥有良好的高温性能,优于其他两种沥青混合料。

  15. Evaluation of the Permanent Deformations and Aging Conditions of Batu Pahat Soft Clay-Modified Asphalt Mixture by Using a Dynamic Creep Test

    Directory of Open Access Journals (Sweden)

    Al Allam A. M.

    2016-01-01

    Full Text Available This study aimed to evaluate the permanent deformation and aging conditions of BatuPahat soft clay–modified asphalt mixture, also called BatuPahat soft clay (BPSC particles; these particles are used in powder form as an additive to hot-mix asphalt mixture. In this experiment, five percentage compositions of BPSC (0%, 2%, 4%, 6%, and 8% by weight of bitumen were used. A novel design was established to modify the hot-mix asphalt by using the Superpave method for each additive ratio. Several laboratory tests evaluating different properties, such as indirect tensile strength, resilient stiffness modulus, and dynamic creep, was conducted to assess the performance of the samples mixed through the Superpave method. In the resilient modulus test, fatigue and rutting resistance were reduced by the BPSC particles. The added BPSC particles increased the indirect tensile strength. Among the mixtures, 4% BPSC particles yielded the highest performance. In the dynamic creep test, 4% BPSC particles added to the unaged and short-term aged specimens also showed the highest performance. Based on these results, our conclusion is that the BPSC particles can alleviate the permanent deformation (rutting of roads.

  16. Differences in cracking resistance of asphalt mixtures due to ageing and moisture damage

    OpenAIRE

    López Montero, Teresa; Miró Recasens, José Rodrigo

    2016-01-01

    The ageing phenomenon and moisture damage become key factors to evaluate mixture cracking resistance. In this paper, the effect of ageing and water on cracking resistance and fatigue behavior in a bituminous mixture is studied. Specimens were tested by a direct tensile test (Fénix test) to obtain fracture energy values whereas variation of complex modulus and dissipated energy density was obtained by a strain sweep fatigue test (EBADE test). Results show a significant reduction in cracking re...

  17. 废橡胶粉改性沥青混合料性能研究%Research on Performance of Modified Asphalt Rubber Mixture

    Institute of Scientific and Technical Information of China (English)

    刘红瑛

    2012-01-01

    The rubber power with the different sizes is added into asphalt at 170~180℃ ,and mixed 1~2 hours, the asphalt rubber is formed. The effect of the different size rubber power on asphalt mixture by rutting test, bend test at low temperature, modified Lottman test and fatigue test is studied; the results show that asphalt rubber can increase soften point, viscosity and increase ductility at low temperature and PL the asphalt rubber with coarse size has higher soften point than with fine size, but the asphalt rubber with fine size has larger ductility than with coarse size at low temperature . the anti-rutting property at high temperature , the anti-cracking property at low temperature , the moisture susceptibility and fatigue property of asphalt rubber mixture ail can be improved significantly . and then the anti-rutting property of asphalt rubber mixture with coarse size rubber is superior to with fine size rubber, the anti-cracking property of asphalt rubber mixture with fine size rubber is superior to with coarse size rubber.%将不同细度的废橡胶粉加到170~180℃的沥青中,充分搅拌1~2 h,制成沥青橡胶.通过车辙试验、低温弯曲试验、冻融劈裂试验以及疲劳试验研究不同细度橡胶粉对沥青混合料性质的影响.结果表明:重交沥青经废橡胶粉改性后,软化点升高,135℃黏度增大;低温延度增加;针入度指数PI增加,同时抗老化性也得到了提高.对于不同细度的橡胶粉改性沥青后,表现为粗的橡胶粉改性沥青的软化点要高于细的橡胶粉,而细橡胶粉改性沥青的低温延度要大于粗的橡胶粉.沥青被橡胶粉改性后其混合料的低温、高温稳定性,水敏感性以及耐疲劳性都得到了显著改善,但不同细度的橡胶粉有差别,粗橡胶粉改性沥青混合料的高稳抗车辙能力要优于细橡胶粉,细橡胶粉改性沥青混合料的低温抗裂性要优于粗橡胶粉.

  18. 消石灰在沥青及其混合料中的应用%The Application of Hydrated Lime in Asphalt and Its Mixture

    Institute of Scientific and Technical Information of China (English)

    童姝娟; 吴国有

    2014-01-01

    This article mainly compares with the performance of the mixed with hydrated lime and mixed with other ingre-dients, proves that the incorporation of hydrated lime asphalt can not only improve the high temperature stability and water stability of asphalt mixture, but also improve the performance of the rest adhesion of the acid mine.%本文主要对掺入消石灰的沥青的性能与掺入其他成分的沥青进行了对比,证明了掺入消石灰的沥青不仅能够改善沥青混合料的高温稳定性和水稳定性,而且还提高了其余酸性矿料的粘附性能。

  19. Evaluation of Marshall Properties of Warm Mix Asphalt using Sasobit

    OpenAIRE

    Renugadevi. A

    2014-01-01

    With increasing concerns of global warming and increasing exhaustion of greenhouse gases, the asphalt industry is looking for alternatives for hot mix asphalt (HMA).Warm Mix Asphalt (WMA) is a fast emerging new technology which has a potential of revolutionizing the production of asphalt mixtures. WMA technology allows the mixing, lay down and compaction of asphalt mixes at significantly lower temperatures compared to Hot Mix Asphalt (HMA). The technology can reduce production tem...

  20. 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。

  1. 环氧橡胶沥青及其混合料的性能研究%Research on Performance of Epoxy-Rubber Modified Asphalt and Its Mixture

    Institute of Scientific and Technical Information of China (English)

    路彦; 张荣辉

    2011-01-01

    采用环氧树脂对橡胶沥青进行复合改性,掌握环氧橡胶沥青的软化点、弹性恢复等基本性能和生产工艺,确定环氧树脂最佳掺量和混合料的最佳配合比.通过马歇尔和车辙试验,检验环氧橡胶沥青混合料的高温稳定性、低温抗裂性能和抗水损害性能,验证其复合改性的优点.%The rubber asphalt is compound modified with epoxy resin, the basic performance of epoxy-rubber modified asphalt: softening point, elastic recovery and so on,also its production process are mastered; the optimal mixing amount of epoxy resin and the best mix proportion of epoxy-rubber modified asphalt mixture are determined by asphalt test. Furthermore, the properties of asphalt mixture are tested by marshall test and rutting test. These experiments test the stability under high temperature regimes, low temperature crack resistance and anti-water damage property of the epoxy-rubber modified asphalt mixture, demonstrat it had the advantage of compound modify.

  2. Design on Asphalt Mixture Ratio Based on Neural Networks%基于神经网络的沥青混合料配合比设计

    Institute of Scientific and Technical Information of China (English)

    孙益民; 钟明; 徐玲; 蒋伟华; 范凯

    2012-01-01

    In order to solve the problem that existing mixing theory cannot optimize various mechanical properties of asphalt mixtures, dozens of experiments in different mixture ratios were designed to test the main performance indexes of each experiment. The Marshall stability and flow values of the mixtures were studied with artificial neural network and the established 6-4-2 BP neural network model, the amount of asphalt binder, cement and four different sizes of ore were inputs, Marshall stability and flow values were outputs. The producing technology of asphalt mixture which mixed with asphalt binder, cement and four different sizes of ore was optimized. Finally, the better mixture ratio in ideal Marshall stability and flow values was obtained: C1 >32%, 16% 7%.%为了改良现有混料理论不能很好解决混合料的各种力学性能优化的问题.通过设计数十种不同配合比试验,分别测试按不同配合比制备的沥青混合料的主要性能指标.运用人工神经网络分析方法,以沥青结合料、水泥和4种不同粒径的矿石的用量比例为模型的输入,以沥青混合料的马歇尔稳定度和流值为输出,建立6 -4 -2的BP神经网络模型,对混合料的马歇尔稳定度和流值两大性能指标进行了研究.从而对沥青结合料、水泥和4种不同粒径的矿石制备沥青混合料的工艺进行了优化,并找到了理想马歇尔稳定度和流值时的适宜配合比为:C1>32%、16%<C2 <40%、C3<22%、12% <C4 <36%、3.5%<C<7.5%、O/S> 7%.

  3. Sasobit温拌排水沥青混合料水稳定性研究%Study on Water Stability of Sasobit Warm Mix Porous Asphalt Mixture

    Institute of Scientific and Technical Information of China (English)

    王坤; 陈景雅

    2013-01-01

    为研究Sasobit温拌排水沥青混合料的水稳定性能及其改善措施.对掺加Sasobit和纤维拌制OGFC-13型混合料,以5种温度成型马歇尔试件,测其各指标;对普通热拌(OGFC-1)、未掺加抗剥落剂(OGFC-2)、掺加消石灰(OGFC-3)、掺加含有生石灰的消石灰(OGFC-4)的Sasobit温拌排水沥青混合料,采用室内试验进行水稳定性能测试与对比分析.试验结果表明:最佳击实温度为150℃;水稳定性OGFC-3>OGFC-1 >OGFC-2>OGFC-4,说明消石灰对水稳性产生有利影响,但影响程度有限,应避免含杂质的消石灰;最佳消石灰用量为1.5%.%To investigate water stability and improve measure of Sasobit warm mix porous asphalt mixture,OGFC-13 warm mixture asphalt were prepared with Sasobit and polyester fibre.Optimal compaction temperature was determined according to test results of specimens formed at 5 different compaction temperatures by Marshall method.Then,general water stability tests was used to test the water stability of 4 kinds of asphalt mixtures,which were porous asphalt mixture of hot mix(OGFC-1),Sasobit warm mix without adding(OGFC-2),Sasobit warm mix adding hydrate lime(OGFC-3) and Sasobit warm mix adding hydrated lime with quick lime(OGFC-4).Test results show that the optimal compaction temperature is about 150 ℃ ; water stability order(OGFC-3>OGFC-1>OGFC-2>OGFC-4) shows that using hydrated lime has beneficial yet limited effects to improve water stability.Hydrated lime with quick lime should be avoided for its adverse effect.1.5 % hydrated lime showed best water stability.

  4. 基于复合材料的橡胶颗粒沥青混合料弹性模量预测%Elastic modulus prediction of crumb rubber asphalt mixture based on composite material

    Institute of Scientific and Technical Information of China (English)

    陈渊召; 李振霞

    2013-01-01

    为对橡胶颗粒沥青混合料弹性模量进行预估,分别建立单夹杂复合材料两层嵌入式模型和多步骤多相细观力学模型,得到橡胶颗粒沥青混合料弹性模量预测方法,对橡胶颗粒沥青混合料弹性模量进行预测;将弹性模量预测结果与实测结果进行对比分析,研究橡胶颗粒沥青混合料弹性模量影响因素,并对低温条件下弹性衰减进行分析.研究结果表明:该细观力学模型方法是有效的和可靠的,可用于预先评估橡胶颗粒沥青路面在低温下的力学性能和除冰能力;沥青胶浆的弹性模量对橡胶颗粒沥青混合料弹性模量的影响较大,且随沥青胶浆弹性模量的增大而增大;橡胶颗粒用量变化对混合料弹性模量的影响比较大,随着橡胶颗粒用量的增加,混合料弹性模量逐渐减小;在低温下,混合料的弹性模量显著增大,橡胶颗粒沥青路面的除冰效果将大大减弱.%In order to predict elastic modulus of crumb rubber asphalt mixture,two-layer embedded model of single inclusion composite and multi-step multiphase micro-mechanical model were established.Prediction method of elastic modulus for crumb rubber asphalt mixture was gotten.Elastic modulus of crumb rubber asphalt mixture was predicted,and elastic modulus comparative analysis of prediction results and measured results was carried out.Influencing factors of elastic modulus for crumb rubber asphalt mixture were researched,and deep analysis on elasticity attenuation under low temperature was carried out.The results show that the micro-mechanical model method is effective and reliable,and can be used to predict mechanical properties and deicing ability of crumb rubber asphalt mixture under low temperature.The effect of elastic modulus for asphalt mortar on elastic modulus for asphalt mixture is big,and elastic modulus of crumb rubber asphalt mixture increases with the increase of the asphalt mortar.The effect of crumb rubber

  5. 温度对温拌橡胶沥青混合料体积参数的影响%Influence of Temperature on Volumetric Parameters of Asphalt Rubber Mixture with Warm-Mix Additive

    Institute of Scientific and Technical Information of China (English)

    王翼; 刘黎萍; 孙立军

    2013-01-01

    Influence of mixing and compaction temperature on volumetric parameters was analyzed for differently graded asphalt rubber mixtures with warm-mix additive.Best asphalt-aggregate ratios of asphalt rubber mixtures with three different gradations and filler contents were determined by the Marshall test firstly.Mixture samples with DAT-H5 were made with different mixing and compaction temperatures.A comparative analysis of volumetric parameters was conducted and evaluated by the rutting test and freezethaw split test.The results show that the asphalt-aggregate ratio determines the technical feasibility of asphalt rubber mixture with DAT-H5.The mixing temperature has significant effect on compaction temperature of asphalt rubber mixtures with DAT-H5 as well.Based on the criteria of air void,the mixing and compaction temperature of asphalt rubber mixture with DAT-H5 could be almost reduced by 30 ℃ compared with the common asphalt rubber mixtures.The high-temperature performance of asphalt rubber stone matrix with DAT-H5 is ensured,while the water stability decreases somewhat.%通过室内试验研究了拌和与成型温度对添加温拌剂的不同级配橡胶沥青混合料体积参数的影响.设计了3种填隙方式的热拌橡胶沥青混合料,对添加DAT-H5温拌剂、采用不同拌和及成型温度的混合料体积参数进行了对比分析,并利用车辙与冻融劈裂试验验证了温拌剂的有效降温幅度.结果表明:油石比对温拌橡胶沥青混合料的技术可行性影响显著;拌和温度对温拌剂降低橡胶沥青混合料所需成型温度的作用影响较为明显;以空隙率为指标,温拌橡胶沥青玛蹄脂碎石混合料拌和与成型温度较热拌橡胶沥青混合料可降低约30℃,高温稳定性良好,但水稳定性有所下降.

  6. 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.

  7. 基于沥青混合料疲劳性能预测的混沌神经网络模型研究%Research on Chaotic Neural Network Model Based on Prediction for Fatigue Performance of Asphalt Mixtures

    Institute of Scientific and Technical Information of China (English)

    吴宏宇; 熊卫士; 张庆明

    2011-01-01

    沥青混合料的疲劳性能是决定沥青路面疲劳开裂的关键因素.由于沥青混合料的疲劳性能受众多因素影响,且各因素之间存在强烈的非线形关系,故难以有效进行预测与优化.提出基于混沌神经网络模型的方法,对以疲劳性能为目标的沥青混合料进行仿真计算,结果表明,此方法高效可行,预测精度高,可为沥青混合料的试验设计提供理论参考.%Fatigue performance of asphalt mixtures is a critical factor determining fatigue cracking of asphalt pavement. Since the fatigue performance of asphalt mixtures is affected by multiple factors, and strong non-linear relationship exists among all factors, it's hard to predict and optimize effectively. This paper proposes a method based on chaotic neural network model to perform simulation calculation for asphalt mixtures with fatigue performance as target. The result shows that this method is highly efficient and feasible, has high prediction accuracy and can provide theoretical reference for test design of asphalt mixtures.

  8. 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)

  9. 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.

  10. 室内试验中沥青混合料的温度问题分析%Problem Analysis of Temperature of Asphalt Mixture in Laboratory Test

    Institute of Scientific and Technical Information of China (English)

    崔通; 缪明澈

    2012-01-01

    In laboratory test, the temperature of test equipment has an influence on test result of asphalt mix- ture. Through the supervision of related equipment during test, the temperature deviation of devices such as calor- stat and mixing pot as well as solutions are proposed. Through the test, the operating temperature of related equip- ment in the test process of various type of modified asphalt is obtained and operation asphalt mixture such as base asphalt, Sasobit modified asphalt, and SBS details needing attention in the test process, such as mixing and sticking & mashing are obtained as well. The test results show that the actual temperature in calorstat is higher than set tem- perature ; the temperature of aggregate is lower than set temperature in calorstat about 8℃ ; the average temperature in mixing pot is lower than set temperature 12℃ ; the temperature measured by infrared thermometer needs to be adjusted and compared with that by thermometer; the tester needs to be fast and skilled in the test.%室内实验中,试验设备的温度会影响沥青混合料的试验结果。通过试验时监测相关设备,提出恒温箱、拌和锅等仪器的温度偏差以及解决办法。通过试验获得基质沥青、Sasobit改性沥青、SBS改性沥青等类型的沥青混合料试验过程中相关仪器的使用温度,以及试验过程中需要注意的操作细节,如拌和、插捣等。试验结果表明:恒温箱内实际温度高于设置温度;集料温度低于恒温箱设置温度8℃左右;拌和锅内平均温度低于设置温度12℃;红外线测温仪测量温度需要和温度计进行校正比较;试验中试验员动作要快速娴熟。

  11. Analysis on cost control methods of asphalt mixture mixing station%解析沥青混合料拌和站的成本控制方法

    Institute of Scientific and Technical Information of China (English)

    张薄

    2014-01-01

    In order to reduce asphalt mixture mixing station cost,the article transforms combustion system and boiler furnace of asphalt mixture mixing station,and shows some material management suggestions from aspects of crusher field selection,raw material piling and in-situ mineral powder production and so on,and summarizes some equipment operation and maintenance cost control measures,with a view to improve economic benefits.%为了降低沥青混合料拌和站的成本,对沥青混合料拌和站设备的燃烧系统与导热油炉进行了改造,并从轧石场的选择、原材料的堆放、现场矿粉的生产等方面给出了料场管理的建议,总结了一些设备操作与保养的成本控制措施,以达到提高企业经济效益的目标。

  12. 泡沫沥青用量对冷再生混合料疲劳性能的影响%The Effect of Foamed Asphalt Content on the Fatigue Performance of Cold Recycled Mixtures

    Institute of Scientific and Technical Information of China (English)

    周兵

    2014-01-01

    The-fatigue-property-of-foamed-asphalt-recycled-mixture-is-an-important-factor-that-affects-its-performance.Through-the-dosage-control-of-the-foamed-asphalt,the-indirect-tensile-strength-test-and-fatigue-test-are-performed,then-the-experimental-results-are-analyzed-to-find-the-relationship-be-tween-the-dosage-of-the-foamed-asphalt-and-the-performance-of-the-foamed-asphalt-mixture-in-order-to-get-a-better-understanding-of-the-performance-of-the-foamed-asphalt-mixture.%泡沫沥青再生混合料的疲劳性能是影响泡沫沥青混合料性能的重要因素。通过控制泡沫沥青的用量,采用间接拉伸强度试验和疲劳性能试验,并对实验结果进行分析,找出泡沫沥青用量和泡沫沥青混合料性能的关系。以期增加对泡沫沥青混合料疲劳性能的了解。

  13. 废塑胶粉复合改性沥青及其混合料性能研究%Research on Properties of Waste Plastic-Crumb Rubber Composite Modified Asphalt and Its Mixture

    Institute of Scientific and Technical Information of China (English)

    王元元; 董强; 李昌洲

    2012-01-01

    为进一步提高废轮胎橡胶沥青混合料路用性能,将废塑料(PP、PVC)制成颗粒或粉末与废轮胎胶粉一起添加到基质沥青中,通过物理和化学等加工工艺制成废塑胶粉复合改性沥青.对两种复合改性沥青的各项性能指标以及混合料路用性能进行试验,结果表明:废聚丙烯-橡胶粉复合改性沥青不仅大幅度降低了沥青胶结料的高温粘度,同时混合料的路用性能还得到了一定程度地提高,即给施工带来了便利又不影响路用性能.相比之下,PP-橡胶粉复合改性沥青混合料路用性能优于传统废轮胎胶粉改性沥青,而PVC-橡胶粉复合改性沥青混合料路用性能相对较弱.%In order to further improve waste crumb rubber asphalt pavement performance, this paper made waste plastics ( PP,PVC) into particles or powder, then added to the asphalt together with the crumb rubber, made into the waste plasyic-crumb rubber composite modified asphalt through physical and chemical processing. After testing the two compound modified asphalt and their mixture performance indicators, it came to the conclusion that PP-crumb rubber composite modified asphalt not only significantly reduces the high temperature viscosity of asphalt binder, but also improves the mixture pavement performance to some extent, that is, to bring the convenience of construction without affecting road performance. In contrast, the road performance of PP-crumb rubber composite modified asphalt mixture is superior to the traditional rubber asphalt; the PVC-crumb rubber composite modified asphalt mixture is relatively weaker.

  14. 考虑油石比波动的沥青混合料可靠度设计%Reliability Design of Asphalt Mixture with Consideration of Asphalt-Aggregate Ratio Fluctuation

    Institute of Scientific and Technical Information of China (English)

    刘克

    2012-01-01

    引入可靠度理论至沥青混合料配合比设计,减少施工油石比(Pb)变异对混合料性能的不利影响.将混合料失效定义为体积指标超出限值,由此提出可靠区间概念.用Pb概率分布函数在可靠区间内积分得到可靠度.以可靠度为评价指标对SMA-13进行级配优化,使SMA-13可靠度提高42.9%的同时不降低其路用性能.绘制可靠区间、Pb标准差与可靠度的诺模图,结合调研推荐:高速公路混合料可靠区间应≥0.6%,其它道路≥0.5%;高速公路混合料可靠度应≥95%,其它道路≥80%.%By introduction of reliability to the asphalt mixture design, the adverse effects of asphalt-aggregate ratio (Pb) variation on performance of mixture is reduced. Exceeding the limits of the volume indicator is defined as failure, and thus the concept of confidence interval is raised. Reliability is got by Pb integration of probability distribution function in confidence interval. Make the reliability as evaluation index to optimize grading of SMA-13, in order to keep the pavement performance when reliability of SMA-13 is increased by 42. 9% . Nomogram of confidence interval, Pb standard deviation and reliability is drawn, and after combination of research, we can get that: recommendable confidence interval of mixture used in highway and other roads should not be less than 0. 6% and 0. 5% respectively, and reliability of highway and other roads should not be less than 95% and 80% respectively.

  15. 橡胶改性沥青混合料技术研究%Rubber Modified Asphalt Mixture Technology

    Institute of Scientific and Technical Information of China (English)

    冯娟; 于江; 李林萍

    2012-01-01

    This paper studies the two processing methods for rubber modified asphalt. On the basis of analysis of rubber asphalt modified mechanism, that rubber asphalt in road construction can improve the road performance of the road, but also has to reduce the traffic noise, and increase driving comfort and safety, and energy conservation and environmentally friendly, significantly improve the economic and social benefits worth promoting.%研究了目前橡胶改性沥青的主要两种加工方法,在分析橡胶沥青改性机理的基础上,指出橡胶沥青在道路建设中既能改善道路的路用性能,又具有降低行车噪音、增加行车舒适度和安全性的作用,而且既节约能源又环保,经济社会效益显著提高,值得大力推广。

  16. Gradation Optimization Design of Skeleton Denseness Asphalt Mixture%骨架密实型沥青混合料级配优化设计

    Institute of Scientific and Technical Information of China (English)

    李林萍; 张金辉; 胡邦燕

    2015-01-01

    以骨架密实级配为研究对象,探讨集料级配与沥青混合料骨架稳定性之间的联系,提出骨架密实级配优化设计方法。运用分形级配理论对 SMA 型级配进行分析,得出各级配粗、细集料的组成特点。采用离散单元程序建立骨架密实级配的直观离散元数值模型,推导了模型颗粒生成的计算式,并进行骨架结构稳定性虚拟试验。得出优化骨架密实级配的分维数范围以及分维数对骨架结构稳定性的影响,可以为骨架密实级配优化设计提供参考。%To explore the relationship of gradation and asphalt mixture structure stability,selecting skeleton-density gradation as the research object,propose optimization design method of skeleton dense-ness asphalt mixture.Applying fractal grading theory analyze SMA gradation,conclude its composition fea-ture of aggregates and range of fractal dimensions.Adopting discrete element software establish the model of skeleton-density gradation.The virtual tests on the mixture structure stability were done.The simulation re-sults showed that,aggregates fractal dimensions make a great influence on structure stability.

  17. 废旧塑料改性沥青混合料动态模量研究%Research on dynamic modulus of waste plastic modified asphalt mixture

    Institute of Scientific and Technical Information of China (English)

    张倩; 谢来斌; 李彦伟; 何勇海; 刘建

    2011-01-01

    Waste plastic is reused in pavement engineering in this research. The purpose of the study is to probe the possibility of using waste plastic in asphalt mixture as a kind of modifier so as to find a way to solve the problem of the waste plastic disposal. High Density Polyethylene plastic bags obtained from supermarket were shredded into pieces and were added into asphalt mixture at three percentages of 2%, 5% and 8%. The corresponding control samples were also made and tested. Three different temperatures were used (4°C, 21. 3°C and 39. 2°C) and the frequencies ranged from 0. 1 Hz to 25 Hz in this dynamic modulus test. When compared with the test results of the control samples, almost all the dynamic modulus of the plastic modified samples( except 4 results) are greater than those of the control samples. No regular pattern is shown in the test results of the phase angle. Modified asphalt mixture with 2% plastic is of the greatest dynamic modulus and phase angle.%针对目前大量废旧塑料处置问题,尝试将其用于改性沥青混合料,以探索其在道路工程中使用的可能性.采用超市废旧高密度聚乙烯购物塑料袋,将其切碎后按照2%.5%和8%的掺量制作沥青混合料试件,采用三种试验温度在六种加载频率下进行动态模量试验,与未掺加塑料混合料的相应指标进行对比.试验结果显示在各个试验温度和加载频率下,掺加塑料屑的混合料动态模量普遍提高.掺加塑料与否对相位角指标的影响未呈现一定规律.在各个试验温度和加载频率下,2%塑料掺量混合料均具有较高的动态模量和相位角.

  18. Hot Mix Asphalt Recycling: Practices and Principles

    NARCIS (Netherlands)

    Mohajeri, M.

    2015-01-01

    Hot mix asphalt recycling has become common practice all over the world since the 1970s because of the crisis in oil prices. In the Netherlands, hot recycling has advanced to such an extent that in most of the mixtures more than 50% of reclaimed asphalt (RA) is allowed. These mixtures with such a hi

  19. COLOR ASPHALT CONCRETE COATING ON POLIMER-TAR BINDER

    OpenAIRE

    Zolotarev, V.; Golovenchic, S.; Oksak, S.; S. Efremov

    2005-01-01

    The possibility of receiving of color asphalt concrete on polimer-tar binder is found. Principal moments of production technology of coloured mixtures and device of asphalt concrete coating have been revealed.

  20. Simulation on temperature field and analysis on quality of heating roller of asphalt mixture%沥青混合料加热滚筒温度场仿真及质量分析

    Institute of Scientific and Technical Information of China (English)

    李旋; 马登成; 杨士敏

    2014-01-01

    为了提高沥青混合料的加热效率与均匀性、降低能源消耗、提高路面就地热再生的施工质量,针对沥青路面养护车加热滚筒不同结构的螺旋叶片,利用Fluent仿真软件,通过数值模拟和分析,建立沥青混合料的流动及加热三维分析模型,采用混合模型、标准 k-ε双方程模型、P1辐射模型的方法,研究不同螺旋角螺旋叶片对沥青混合料加热效率及加热均匀性的影响。研究结果表明:螺旋叶片的螺旋角对沥青混合料的加热效率以及加热均匀性影响较大,其中68°螺旋叶片加热效率最高、加热均匀性最好,为加热滚筒螺旋叶片的设计提供了借鉴。%To improve the heating efficiency and uniformity of asphalt mixture ,reduce energy con-sumption and improve the quality of asphalt pavement in place recycling ,aimed at the heating roller of asphalt pavement maintenance equipment ,the different structures of blade were designed .Through numerical simulation and analysis via Fluent ,the 3D analysis model of asphalt mixture were estab-lished .The mixture model ,stand k-εmodel and P1 model were obtained in this simulation .The influ-ence of the different helix angle of blade upon the heating efficiency and uniformity about asphalt mix-ture was discussed .Results show that the heating efficiency and uniformity of asphalt mixture are sig-nificantly different among distinct helix angles of blade .The heating efficiency and uniformity of as-phalt mixture is the best when the helix angle of blade is 68° ,which provides a reference for the desig-ning blade of the heating roller .

  1. 掺加消石灰对沥青混合料抗剥离性能的影响%Effect on Anti-Stripping Performance of Asphalt Mixture by Mixing Hydrated Lime

    Institute of Scientific and Technical Information of China (English)

    杜顺成; 索小刚

    2013-01-01

    为了提高和改善沥青混合料的抗剥离性能,通过在沥青混合料中掺加消石灰进行级配设计和混合料试验研究,对掺加消石灰前后的沥青混合料各项路用性能进行对比。实验结果表明:掺加1%消石灰的沥青混合料,可以有效地增强沥青混合料抗剥落性能,提高沥青混合料的长期抗水损害能力,改善沥青混合料的高温、低温和抗疲劳性能。%In order to improve anti stripping performance of the asphalt mixture ,design gradation is made by adding hydrated lime to asphalt mixture .Starting from the hydrated lime optimal dosage , experimental results show :the asphalt mixture treated by hydrated lime (1% ) effectively enhances the anti stripping performance of asphalt ,improves long-term anti water damage ability ,at the same time , also improves the properties at high and low temperature and anti fatigue ability .

  2. 泡沫沥青发泡特性及其冷再生混合料性能研究%Research on Foaming Characteristics of Foam Asphalt and Performance of its Cold Recycled Mixture

    Institute of Scientific and Technical Information of China (English)

    奎永才; 卢章天

    2015-01-01

    选择3种沥青,采用沥青发泡试验就沥青品种、温度及发泡用水量对发泡效果的影响进行研究,并通过无侧限抗压强度试验、间接拉伸试验以及浸水马歇尔试验、冻融劈裂试验对沥青用量和RAP(沥青路面回收旧料)掺量对泡沫沥青冷再生混合料力学性能和水稳定性的影响进行研究. 结果表明:在所选3种沥青中,相同条件下中海70 #沥青的发泡效果最好,其最佳发泡温度约为160 ℃,最佳发泡用水量为2%;RAP掺量增加对混合料水稳定性能不利;随着RAP掺量增加,混合料无侧限抗压强度和间接拉伸强度逐渐降低;RAP掺量可达70%以上,但应严格控制.%This paper studies influences of varieties of asphalt, temperature and water consumption for foaming on foaming effect by selecting 3 kinds of asphalt and by means of asphalt foaming test, and studies influences of asphalt dosage and mixing amount of RAP ( reclaimed asphalt pavement ) on mechanical properties and water stability of cold recycling mixture of foaming asphalt via unconfined compressive strength test, indirect tensile test and immersion Marshall test and freeze-thaw split test. The results show that among the selected 3 kinds of asphalt, the foaming effect of Zhonghai No. 70 asphalt under the same conditions is the best, its optimal foaming temperature is approximate 160℃, and the best forming water consumption is 2%;increase of RAP mixing amount is adverse to water stability of mixture;with increase of RAP mixing amount, the unconfined compressive strength and indirect tensile strength of mixture decrease gradually;the RAP mixing amount can be up to 70%, but should be strictly controlled.

  3. Design of porous asphalt mixture based on porous model%基于空隙模型的大空隙沥青混合料设计

    Institute of Scientific and Technical Information of China (English)

    邱青云; 魏庆朝; 关彦斌

    2011-01-01

    Void rate has a great influence on permeability and mechanic property of porous asphalt mixture. Permeability pavement may select adaptive void rate according to requirement. Target void rate obtained in void model can be used to design mixture ratio. The result indicate that target void rate obtained in void model can be used to guide mixture ratio design, which provide an efficient and accurate method for traditional design.%空隙率的大小对大空隙沥青混合料的渗透性及力学性能具有很大影响,透水铺面应根据用途选择合适的空隙率,在一定的水头(降雨强度)下利用空隙模型确定的目标空隙率进行混合料配合比设计.结果表明,空隙模型确定的目标空隙率可为混合料的配合比设计提供理论指导,提高了传统设计方法的工作效率和准确性.

  4. 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...

  5. 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.

  6. 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 ...

  7. 沥青混合料中掺加消石灰粉替代部分矿粉施工质量控制%Quality Control of Asphalt Mixture with Hydrated Lime Changing Some Mineral Powder

    Institute of Scientific and Technical Information of China (English)

    宋宗平

    2012-01-01

    Changing some mineral powder for hydrated lime in asphalt mixture at down layers of Lianyungang-Yancheng expressway is applied to improve the adhesion between asphalt and pebbles and water damage resistance for asphalt pavement. The construction process, mix proportion, compacting scheme and construction control points of the method of changing some mineral powder for hydrated lime is introduced. The whole quality of asphalt mixture is controlled.%为改善沥青与石料黏附性,提高沥青路面的抗水损害能力,在连盐高速公路下面层结构沥青混凝土混合料中,以消石灰替代部分石灰岩矿粉(总量不超过混合料质量的2%)进行施工.介绍了消石灰粉替代部分矿粉进行施工的工序、配合比设计、压实方案和施工控制要点,最终沥青混合料总体质量得到控制.

  8. 温拌橡胶沥青混合料拌和和压实温度研究%Research on Compaction T emperature and Performance of Warm Mix Rubber Asphalt Mixtures

    Institute of Scientific and Technical Information of China (English)

    王志祥; 霍洋洋; 党合欢

    2015-01-01

    为了研究温拌剂对橡胶沥青混合料拌和和压实温度的影响,降低实验温度,减少混合料的老化和废气的排放,选用自行开发的ZYF添加剂、低温高性能 PRLT 添加剂、Evotherm添加剂作为温拌剂,探究3种温拌橡胶沥青的粘温曲线以及混合料空隙率随压实温度的变化规律,推荐掺加3种温拌剂的橡胶沥青混合料适宜的拌和、施工温度,并研究3种不同温拌剂对橡胶沥青混合料的路用性能的影响。结果表明:ZYF温拌橡胶沥青混合料的压实温度可以降低20~25℃,PRLT 温拌橡胶沥青混合料的压实温度可以降低25~30℃,Evotherm温拌橡胶沥青混合料可以降低20~25℃;3种类型的温拌技术均可提高橡胶沥青混合料的高温性能、低温性能,但ZYF和Evotherm温拌剂的加入对橡胶沥青混合料的水稳性能有不利影响。%Aiming at reducing the experimental temperature ,aging of rubber asphalt mixtures and the emissions ,this paper selected self‐developed ZYF additives ,low temperature performance PRLT addi‐tives ,Evotherm as warm mix additives ,explore three warm mix asphalt rubber viscosity‐temperature curves and the variation of porosity compaction temperatures ,recommended the suitable mixing ,con‐struction temperature of three temperature mix asphalt rubber mixes ,and to study the impact of three different additives on the rubber warm asphalt mix .The results show :ZYF warm mix rubber asphalt mixture ,PRLT warm mix rubber asphalt mixture and Evotherm warm mix rubber asphalt mixture can reduce compaction temperature about 20~25℃ ,25~30℃ and 20~25℃ ,respectively .T he three types of warm mix technologies can both improve high‐temperature rutting resistance and low temperature performance of asphalt rubber mixtures ,while ZYF and Evotherm warm mix has adverse effect on wa‐ter stability of rubber asphalt mixtures .

  9. Curing Reaction Model of Epoxy Asphalt Binder

    Institute of Scientific and Technical Information of China (English)

    QIAN Zhendong; CHEN Leilei; WANG Yaqi; SHEN Jialin

    2012-01-01

    In order to understand the strength developing law of the epoxy asphalt mixture,a curing reaction model of the epoxy asphalt binder was proposed based upon the thermokinetic analysis.Given some assumptions,the model was developed by applying the Kissinger law as well as Arrhenius equation,and the differential scanning calorimetry was performed for estimating the model parameters.To monitor the strength development of the epoxy asphalt mixture,a strength test program was employed and then results were compared to those produced from the proposed model.The comparative evaluation shows that a good consistency exists between the outputs from test program and the proposed model,indicating that the proposed model can be used effectively for simulating the curing reaction process for the epoxy asphalt binder and predicting the strength development for the epoxy asphalt mixture.

  10. 剑麻纤维沥青混合料最佳纤维掺量试验研究%Experimental study on optimal dosage of fiber in asphalt mixture with sisal fiber

    Institute of Scientific and Technical Information of China (English)

    杨瑞华; 周前程

    2015-01-01

    剑麻纤维掺量是影响剑麻纤维沥青混合料性能的主要因素之一,通过马歇尔试验、谢伦堡沥青析漏试验和高温车辙试验综合确定剑麻纤维最佳用量,试验结果表明0.4%掺量的剑麻纤维沥青混合料性能最佳。%The optimal dosage of sisal fiber in asphalt mixture is one of the main factors influencing the performance of asphalt mixture. The opti-mal dosage of sisal fiber was determined through Marshall test,Schellenberg binder drainage test and rutting test. The results showed that the op-timal dosage of sisal fiber was 0. 4%.

  11. 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。

  12. 提高花岗岩沥青混合料水稳定性能措施的研究%Study on Measures Improving Water Stability Performance of Granite Asphalt Mixture

    Institute of Scientific and Technical Information of China (English)

    王月峰

    2012-01-01

    为有效提高花岗岩沥青混合料水稳定性能,通过试验检测了花岗岩集料的各项技术指标;对使用不同细集料、不同抗剥落剂的花岗岩沥青混合料分别进行了配合比设计和路用性能验证;利用常规水稳定性能试验和汉堡车辙试验对各种花岗岩沥青混合料的水稳定性能进行了测试。结果表明:采用石灰岩细集料能够有效提高花岗岩沥青混合料的水稳定性能;掺加消石灰或水泥均能大幅度改善花岗岩沥青混合料的水稳定性能,消石灰的改善效果最优。%In order to effectively improve water stability performance of granite asphalt mixture the technical index of the granite aggregate are measured through tests; the proportion design and pavement performance of the granite asphalt mixture with different fine aggregates and anti-stripping agents are verified; and the water stability of the granite asphalt mixture is tested by conventional water stability test and Hamburg wheel tracking test. The study results show that water stability of granite asphalt mixture with limestone fine aggregate could be increased effectively; that with lime hydrate or cement could be improved to a large extent, wherein the effect of lime hydrate is the best.

  13. Influence of Foamed Asphalt Content and Aggregate Gradation on Mixing Moisture Content of Mixture%泡沫沥青用量和矿料级配对混合料拌和用水量影响

    Institute of Scientific and Technical Information of China (English)

    赵桂娟

    2012-01-01

    为了研究泡沫沥青用量和矿料级配对泡沫沥青混合料所需合理拌和用水量的影响,设计了3种矿料级配组成OA1、OA2和OA3,通过变化4种沥青用量2%、3%、4%、5%(相对于矿料干重的百分比),5种拌和用水量,即混合料最佳击实含水率(OMC)的60%、70%、80%、90%、100%,将各组合下制备成的泡沫沥青混合料成型试件,测定其间接拉伸强度和干密度.结果表明:不同的矿料级配、泡沫沥青用量和拌和用水量条件下制备的泡沫沥青混合料具有不同的间接拉伸强度和干密度.不同的矿料级配和不同的混合料拌和用水量存在最佳泡沫沥青用量3%.综合推荐出泡沫沥青混合料OA1、OA2和OA3适宜的拌和用水量范围分别为65%~80%OMC、70%~85%OMC和75% -85%OMC.通过试验路的铺筑观测发现,使用状况良好,验证了此研究结果是合理的.%The reasonable water consumption of foamed asphalt mixture is influenced by the content of foamed asphalt and mineral aggregate gradation. This paper studied the indirect tensile strength and dry density of foamed asphalt mixture model using three types of mineral aggregate gradation, four different asphalt contents and five kinds of optimum compaction water content. The results show that the foamed asphalt mixture has different indirect tensile strengths and dry densities with various mineral aggregate gradations, foamed asphalt contents and water consumptions. The optimum content of foamed asphalt is determined by 3% according to different gradations and water consumptions of asphalt mixture. The tests indicate that appropriate water consumption ranges are 65% -80%OMC, 70% -85%OMC and 70% -85%OMC for asphalt mixture OA,, OA2 and OA3, respectively. The conclusions are verified by a lot of test results.

  14. 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 ...

  15. Asphalt Mixture Crack Transverse Stability Characteristics Considering Vehicle Load%考虑车辆荷载的沥青混料抗裂横向稳定特征

    Institute of Scientific and Technical Information of China (English)

    冯春

    2014-01-01

    车辆荷载效应对公路沥青混合料强度与抗裂横向稳定特征有重要影响。研究在车辆荷载影响下的沥青混料抗裂横向稳定方程,建立沥青混合料强度与疲劳行为之间的关系,通过分析车辆荷载效应均值变化对限载系数的影响规律,以粒式沥青混合料AC-13C为研究对象,进行了AC-13CBS(I-D)改性沥青混合料强度试验,设计沥青混合料原材料得到的路面抗裂结构分析模型,得到车辆荷载下沥青混料强度集料毛体积密度试验结果和AC-13C路面沥青混料配合比下的最佳油石比试验结果。通过概率密度函数特征计算结构可靠度的抗裂横向稳定特征计算,进行车辆荷载限载系数分析和抗裂横向稳定特征分析实验。实验结论表明,该方案能定量分析沥青混料抗裂性与车辆荷载影响关系模型,提高沥青路面的疲劳寿命。%The effect of vehicle load has an important factor on the highway asphalt mixture strength and crack resistance of lateral stability characteristics. The vehicle load under the influence of the asphalt mixture crack transverse stability equa-tion is researched, establishes the relationship between the asphalt mixture strength and fatigue behavior, through the influ-ence analysis of vehicle load effect mean change on the limit load coefficient, the grain type of asphalt mixture AC-13C is taken as the research object, the AC-13CBS (I-D) modified asphalt mixture strength test is taken, the design of asphalt mix-ture pavement cracking raw material obtained from the analysis of the structure model is obtained. The probability density functions of the features of the lateral stability calculation of crack resistance characteristics of structural reliability is de-signed for vehicle load, the limit load coefficient analysis and anti lateral stability analysis experiment is taken. The experi-mental results show that the quantitative analysis of asphalt mixture

  16. Evaluation and performance based mix design of rubber modified mixtures: Laboratory evaluation of asphalt concrete mixtures using waste tires. Final report

    Energy Technology Data Exchange (ETDEWEB)

    Goulias, D.G.; Ali, A.H.M.

    1997-02-01

    New Jersey Department of Transportation has been investigating the use of rubber modified materials over the last few years with the design and use of dense and gap graded mixtures, and in some cases the incorporation of RAP materials, in selected projects. While the short term field performance of these materials is satisfactory, their long term performance is unknown. These mixtures were designed with the traditional Marshall mixture design method, and thus is was not considered design criteria related to mixture behavior and performance into mixture selection. The main objective of this study is the development of a mixture design methodology for rubber modified materials that considers mixture behavior and performance. In order to achieve this objective researchers conducted a laboratory investigation which was able to evaluate mixture properties that can be related to mixture performance, (in terms of rutting, low temperature cracking, and fatigue), and simulating the actual field loading conditions that the material is being exposed to. The possibility of coupling the traditional Marshall mix design method with parameters related to mixture behavior and performance was investigated since this technique has been used over the years by the agency, and the necessary testing apparatus is available to both the agency and material laboratories. The SHRP SUPERPAVE mix design methodology was reviewed and considered in this study for the development of an integrated performance based design procedure. However, its applicability and use on routine bases was not considered at this time since it requires specific equipment with ongoing evaluation for its repeatability and precision. Finally, for the conduct of this investigation materials and mixtures used by NJDOT in rubber modified paving projects were used.

  17. Pitch-asphalts - new binder for road construction

    Energy Technology Data Exchange (ETDEWEB)

    Stompel, Z.; Collin, G.; Szen, A.; Herion, G.

    1988-01-01

    Discusses chemical and physical properties of a mixture of pitches and asphalts produced by the Blachownia Chemical Plant. The mixture consists of coal tar pitches with 25.7% content of toluene-insoluble fractions, anthracene oil and Dex asphalt. The following properties were analyzed: density, softening and softening point, adhesion, viscosity, sedimentation after 14 days. Physical and chemical properties of the pitch-asphalt from Blachownia were compared to those of pitch-asphalt from Ruetgerswerke AG in the FRG. Pitch-asphalt properties were evaluated from the point of view of their use in road construction. 8 refs.

  18. 消石灰对沥青混合料的抗水性能分析%The Effect of Hydrated Lime on Water Resistant Properties of Asphalt Mixture

    Institute of Scientific and Technical Information of China (English)

    李伟杰

    2011-01-01

    From the theosefical analysis of the performances of asphalt mixture,it is shown that adding lime hydrate can improve its water resistance,and enhances the bond strength between asphalt and aggregate. Meanwhile,the amount of hydrated lime and the amount of asphalt are discassed. The optimal amount of hydrated lime is 1% to 2% ,and it should not be used too much. In addition,if hydrated lime is increased, the asphalt must have a corresponding increase.%根据消石灰改善沥青混合料的性能,分析了消石灰的用量对沥青混合料抵抗水损害的影响以及消石灰的用量与沥青用量之间的关系.通过试验对比证明消石灰的加入可以改善沥青混合料的抗水性能,提高沥青与集料间的粘结强度.消石灰的掺入量在1%~2%之间为宜,消石灰的加入,还须增加相应的沥青用量,提高油石比.

  19. 短切PAN基碳纤维导电沥青混合料性能试验研究%Experimental research on performances for conductive asphalt mixture with chopped PAN-based carbon fiber

    Institute of Scientific and Technical Information of China (English)

    查旭东; 陈勇强; 程景

    2012-01-01

    In order to determine a reasonable carbon fiber contents for the conductive asphalt mixture with carbon fiber,the chopped polyacrylonitrile(PAN) based carbon fiber was selected as a conductive phase material.Many laboratory experiments were conducted to analyze the effect of the carbon fiber contents on the Marshall performances and the conductive performances for the AC-13C of conductive asphalt mixture and then verify its pavement performances.The results show that,under the same asphalt-aggregate ratio,with the increases of the carbon fiber contents,the bulk volume density,the voids filled with asphalt and the Marshall stability of the conductive asphalt mixture are appeared the trend from increasing to decreasing,the volume of air voids and the voids in mineral aggregate are changed as the relation from decreasing to increasing,but the flow value is increased continuously.The technical standards of AC,adjustment and SMA were applied to the asphalt mixtures with the different ranges of carbon fiber content,respectively,and the reasonable optimal asphalt-aggregate ratios were determined.There is a good semilogarithm correlation between the optimal asphalt-aggregate ratios and the carbon fiber contents.Under the optimal asphalt-aggregate ratio,a good correlation of power function is showed between the logarithms of electrical resistivity and the carbon fiber contents for the conductive asphalt mixture.All the pavement performances of asphalt mixture with 0.1% of carbon fiber content have attained the technical requirements of modified asphalt mixture and SMA in the climate conditions with high demand.Therefore,the suitable carbon fiber content can play an excellent role in reinforcing the conductive asphalt mixture and then form the stable conductive network.The technical requirements of various performances and conductive heating are integrated to recommend the suitable carbon fiber content as 0.1%.%为了确定碳纤维导电沥青混合料的合理碳纤

  20. 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.

  1. Evaluación de las propiedades mecánicas de una mezcla densa en caliente modificada con asfaltita/Mechanical Properties Evaluation of a hot Asphalt Mixture Modified with Asphaltite

    Directory of Open Access Journals (Sweden)

    Hugo Alexander Rondón Quintana

    2012-12-01

    Full Text Available El trabajo evaluó en laboratorio la resistencia mecánica bajo carga monotónica, el módulo resiliente y la resistencia a la deformación permanente que experimenta una mezcla asfáltica cuando se modifica con una asfaltita. Adicionalmente, fue evaluada durante dos años, la influencia del medio ambiente de la ciudad de Bogotá D.C., sobre las propiedades mecánicas de la mezcla modificada. Se concluye que la resistencia mecánica de la mezcla asfáltica modificada incrementa en comparación con la convencional. La tendencia general de las mezclas con el tiempo de exposición al medio ambiente de Bogotá D.C., es experimentar un aumento en los valores de rigidez debido principalmente a procesos de endurecimiento por envejecimiento del ligante asfáltico. Sin embargo, para el caso de las mezclas modificadas y fabricadas con CA 60-70 en los primeros cinco meses de exposición, la rigidez disminuye.The strength under monotonic load, resilient modulus and rutting were evaluated on a hot-mix asphalt (HMAmodified with a natural sphaltite. Additionally, the influence of the environmental conditions of BogotáD.C., was evaluated during two years on the mechanical properties of a modified asphalt mixture. The results show that the mechanical properties evaluated were better for the HMA mixes modified in compared with those with neat asphalts. The asphaltite produces higher mechanical resistance in HMA. The general tendency of the mixtures is increase the modulus with time due to aging of the asphalt cement. However, modified mixtures with AC 60- 70, decrease in stiffness during the first months.

  2. 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...

  3. Study on Performance Impact for Polyester Fibers into Melting Ice and Snow MFL-asphalt Mixture%聚脂纤维对MFL融冰化雪沥青混合料的性能影响研究

    Institute of Scientific and Technical Information of China (English)

    何湘宁

    2014-01-01

    At low temperatures,a salt for asphalt mixture can improve pavement skid resistance, but there are some problems in pavement performance.The purpose of the paper is to study and analysis on improving pavement performance of melting ice and snow MFL-asphalt mixture (MMAM)after appen-ding polymer fibers.Comparative analysis with the base asphalt mixture,asphalt mixture with MFL and fiber reinforced MMAM was performed.Results indicated that polyester fibers can not influence the melt-ing ice and snow effect and rutting resistance of MMAM.Besides,it was found that water stable perform-ance and crack resistance at low temperature of MMAM were lower than those of base asphalt mixture, and maximum bending strain at low temperature of MMAM decreased 33 .4%,compared to that of base asphalt mixture.An encouraging founding from this study was that polyester fibers can improve anti-water damage ability and crack resistance at low temperature,and its maximum bending strain at low tempera-ture increases 10% compared to that of base asphalt mixture.%在冬季或低温条件下,盐化物沥青混合料融冰化雪技术能够提高路面的抗滑性能,但混合料的路用性能方面仍存在一定的缺陷。通过在 MFL融冰化雪型沥青混合料(MMAM)的基础上添加聚酯纤维技术处理,通过对普通、MMAM以及聚脂纤维+MMAM混合料的融冰化雪效果和路用性能进行测试对比分析,结果表明:聚酯纤维不会影响 MFL的融冰化雪功能,MMAM和聚脂纤维+MMAM都能够实现融冰化雪效果;另外,聚酯纤维的添加对 MMAM的抗车辙性能不产生影响;与普通混合料相比,MMAM的水稳定性和低温抗裂能力明显降低,且低温破坏弯曲应变降低幅度达到33.4%,而聚酯纤维的添加可以改善 MMAM的抗水损害能力与低温抗裂能力,且低温破坏弯曲应变提高幅度达到10%。

  4. 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…

  5. Experimental Study on Fatigue Property of Asphalt Mixtures under Effect of Freezing and Thawing%冻融作用下沥青混合料疲劳性能试验研究

    Institute of Scientific and Technical Information of China (English)

    王立新

    2011-01-01

    冻融试验可用于模拟潮湿条件下路面受到水损害时其疲劳寿命的变化.针对AC - 25沥青混凝土设计3种级配,进行冻融劈裂疲劳试验,建立无水和有水条件下的疲劳方程,分析不同因素对冻融后沥青混合料疲劳性能的影响,揭示冻融后沥青混合料疲劳性能衰减机理.%Freezing-thawing test can be used to simulate changes of fatigue lifetime of pavement subject to water damage under the moist condition. This paper designs three gradations aiming at AC-25 asphalt concrete to carry out freezing-thawing fracturing fatigue test, to establish fatigue equations under conditions without water and with water, to analyze influences of different factors on fatigue property of asphalt mixtures after freezing and thawing, and to discover attenuation mechanism of fatigue property of asphalt mixtures after freezing and thawing.

  6. 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.

  7. Increasing the rate of recycled asphalt: an experimental study

    Directory of Open Access Journals (Sweden)

    Marjan TUŠAR

    2014-09-01

    Full Text Available Asphalt is material that can be recycled. In particular reclaimed asphalt (RA contains aged binder, which limits the reuse of RA. In this study the rate of recycled asphalt was increased by adding a rejuvenator containing paraffin. The authors investigated the effect of the rejuvenator in laboratory and in plant prepared samples of asphalt mixture. In laboratory samples with different percentage of RA (0%, 10%, 30%, 50% and rejuvenator were prepared. In asphalt plant only asphalt mixture with highest amount of RA and rejuvenator and control mixture without RA were prepared. On samples were conducted different tests, e.g. determining softening point, Fraass breaking point, penetration, indirect tensile strength. Results on extracted bitumen showed increase in softening point and decrease in Fraass breaking point with increasing percentage of RA and rejuvenator, meaning that service temperature of binders increased. Asphalt samples prepared in asphalt plant were laid on test field. Asphalt with RA and rejuvenator was built in at lower temperature (round 100 °C. Mixtures with RA and rejuvenator have better low temperature properties confirmed with Thermal Stress Restrained Specimen Test (TSRST method, but are less resistant to compaction and less sensitive to water than control mixture. For comparison of long term behaviour wheel tracking test was performed on mixtures built in test field. A week after paving, the control mixture showed better properties, but one year later the results were opposite, asphalt containing RA and rejuvenator was more resistant to rutting. From the results of this experimental study the following was concluded: the amount of RA can be increased by using rejuvenator and the quality of such asphalt mixture is in most cases equal or even better than asphalt mixture made of virgin materials. By using RA we preserve nature, reduce usage of virgin raw materials, but it is cost effective only if recycling degree is high

  8. 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

  9. On application of foamed asphalt cold recycled mixture in road flexible base%泡沫沥青冷再生混合料在道路柔性基层的应用

    Institute of Scientific and Technical Information of China (English)

    赵华

    2012-01-01

    Taking the foamed asphalt cold recycled mixture in some road construction as the example,the paper analyzes the performance of the foamed asphalt,illustrates the relative construction methods and the process control,and it achieves certain results in the road operation,so the material can be further applied in the municipal road construction.%以泡沫沥青冷再生混合料在某道路施工中的应用为例,对泡沫沥青的性能进行了分析,阐述了相关施工方法与过程控制,经道路建成营运取得了一定的成果,该种材料可在市政道路建设中推广应用。

  10. Application Technology Research on Overlay Maintenance of Rubber Modified Asphalt Mixture%橡胶粉改性沥青混合料罩面养护应用技术研究

    Institute of Scientific and Technical Information of China (English)

    辛顺超; 杨静

    2014-01-01

    通过沥青和沥青混合料室内试验对比分析了基质沥青与橡胶粉改性沥青的性能,采用非常规试验研究了各种材料加铺罩面的应用效果与经济效益。结果表明:在橡胶粉掺量为10%时,相比基质沥青而言,改性沥青混合料的动稳定度提高2.73倍;残留稳定度增加11%;冻融劈裂强度比提升10.2%,在破坏荷载为3 kN 时,可少铺筑厚度7.3 mm,在此情况下铺设长1 km,宽8.5 m 的公路可节约资金9322.8元。橡胶粉改性沥青混合料的应用可以延长路面使用寿命,提高经济效益。%This article comparatively analyzed the performance of asphalt and rubber powder modi-fied asphalt through laboratory tests.Unconventional test was used to examine the application overlay effects and economic benefits of Different materials.The results showed that:In the rubber powder con-tent of 10%,compared with asphalt,modified asphalt mixture dynamic stability increased 2.73 times;residual stability increased by 1 1 %;freeze-thaw splitting strength ratio improved 10.2%.When at fail-ure load of 3 kN,paving thickness can be less than the asphalt mixture 7.3 mm,in this case,if laying 1 km long,8.5 m wide road can save 9 322.8 Yuan.The applications of rubber powder modified asphalt can extend the pavement life and improve economic efficiency.

  11. 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

  12. FATIGUE EQUATION OF ASPHALT MIXTURE CONSIDERING THE INFLUENCE OF LOADING RATE%考虑加载速度影响的沥青混合料疲劳方程

    Institute of Scientific and Technical Information of China (English)

    吕松涛

    2012-01-01

    In order to establish the relationship between the strength and fatigue behavior of asphalt mixture, the direct tensile strength tests under different loading rates are presented and the power function rule between the strength and loading rate is revealed. Basing on the strength values under different loading rates, the real stress ratios corresponding to the fatigue loading rates of asphalt mixture are obtained. The asphalt mixture fatigue equations based on nominal and real stress ratio are created by fatigue tests. The intersection of fatigue curve characterized by the .nominal stress ratio and abscissa axis is much larger than 1. The fatigue curve based on a nominal stress ratio cannot be extended. But the fatigue curve characterized by a real stress ratio can be extended to the strength failure point, whose fatigue life is 1. The strength and fatigue failure behavior are unified. The structure coefficient of tensile strength of asphalt pavement is deduced. The results of the research provide a theoretical foundation for revising the specifications for the design of highway asphalt pavement in our country.%为了建立沥青混合料强度与疲劳行为之间的联系,通过不同加载速率下的沥青混合料直接拉伸强度试验,揭示了强度随加载速率的幂函数变化规律;基于不同加载速率下的强度值,得到了与疲劳加载速率对应的沥青混合料疲劳真实应力比;通过疲劳试验,创建了基于名义应力比和真实应力比的沥青混合料疲劳方程,基于名义应力比的疲劳方程后延后与横坐标的交点远比1大,不具有后延性,而基于真实应力比的疲劳方程可以后延到疲劳寿命为1的强度破坏点,统一了强度破坏与疲劳破坏行为;据此推导了沥青路面抗拉强度结构系数计算新方法;研究结果可为我国公路沥青路面设计规范的修订提供理论依据。

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

    Science.gov (United States)

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

    2016-08-01

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

  14. 用真实应力比表征的老化沥青混合料疲劳性能%Fatigue Performance of Aged Asphalt Mixture Characterized By Real Stress Ratio

    Institute of Scientific and Technical Information of China (English)

    吕松涛

    2012-01-01

    为了弥补现行沥青路面设计规范在利用传统疲劳方程进行疲劳设计时的不足,通过对沥青混合料进行不同程度的长期老化试验模拟了路面实际的老化程度.通过不同加载速率下的沥青混合料强度试验,揭示了强度随加载速率的变化规律.基于不同加载速率下的强度值,得到了与疲劳加载速率对应的疲劳真实应力比,建立了基于名义应力比和真实应力比的沥青混合料疲劳方程.基于名义应力比的疲劳方程曲线后延后与横坐标的交点远比1大,不具有后延性,而基于真实应力比的疲劳方程曲线可以后延到疲劳寿命为1的强度破坏点,统一了强度破坏与疲劳破坏的内在联系.建立了基于真实应力比的老化沥青混合料疲劳方程,疲劳方程曲线均通过(1,1)点.研究结果可为沥青路面设计时考虑老化效应的影响和抗拉强度结构系数的正确计算提供理论方法和依据.%In order to make up for the fatigue design shortage of asphalt pavement design specification in using traditional fatigue equation, the actual aging degree of asphalt pavement was simulated by different long term aging degree tests of asphalt mixture. The regularity of strength varying with loading rate was revealed through strength tests of asphalt mixture in different loading rates. Based on the strength values in different loading rates, the real stress ratios corresponding to the fatigue loading rates were obtained. The asphalt mixture fatigue equations based on nominal and real stress ratios were created. The intersection of fatigue curve characterized by nominal stress ratio and abscissa axis is much larger than 1, it cannot be extended; while the fatigue curve characterized by real stress ratio can be extended to the strength failure point, which the fatigue life is 1, it unified the inner relationship between strength and fatigue failures. The fatigue equation of aged asphalt mixtures based on real

  15. Fatigue Properties of Asphalt Mixtures under Broad Stress Ratio Conditions: Improved S-N Model%宽应力比条件下的沥青混合料疲劳特性:改进的S-N模型

    Institute of Scientific and Technical Information of China (English)

    吕松涛; 郑健龙

    2011-01-01

    为了避免采用分段函数的不方便性和弥补传统S-N疲劳方程分析宽应力比条件下沥青混合料疲劳特性的不足,揭示了应用反曲函数( Sigmoidal Function)描述宽应力水平下沥青混合料疲劳规律的适用性,通过原材料试验及配合比设计,确定了沥青混合料级配和最佳油石比,利用MTS810( Material Test System 810)对沥青混合料进行了较宽不同应力比下的疲劳试验,采用反曲函数对试验结果进行了拟合,建立了宽应力比条件下沥青混合料改进的S-N疲劳模型,利用该模型对疲劳寿命进行了预估,并与传统S-N模型预估结果进行了比较.结果表明:采用反曲函数建立的改进的S-N疲劳模型能模拟宽应力比条件下的沥青混合料疲劳规律,证实了其先进性,该模型各参数具有明确的疲劳物理意义,且其参数值容易获得.%For avoiding the inaccessibility of the segment function and make up the insufficiency of using traditional S-N fatigue equation to analyze the asphalt mixture's fatigue characters under broad stress ratio condition, the applicability of using sigmoidal function to describe the fatigue regularity of asphalt mixtures under broad stress ratio condition was revealed. The asphalt mixture gradation and optimum asphalt-aggregate ratio were determined by the tests of raw materials and the design of mixture proportions. The fatigue tests of asphalt mixtures were carried out by MTS-810 under broad stress ratio conditions. The test results were fitted by sigmoidal function. The improved S-N fatigue model was established under broad stress ratio condition. The fatigue life was predicted by the improved S-N fatigue model, and the estimate result was compared with the conventional one. It indicates that the improved S-N fatigue model based on the sigmoidal function can simulate the fatigue regularity of asphalt mixtures under broad stress ratio condition. The advantages of the new model were confirmed. The

  16. 沥青混合料拉压疲劳损伤试验%Experiment of Tension-compression Fatigue and Damage for Asphalt Mixture

    Institute of Scientific and Technical Information of China (English)

    钱国平; 刘宏富; 郑健龙; 蒋丽君

    2012-01-01

    为研究沥青路面结构实际处于拉压应力作用下的疲劳损伤特性,针对沥青混合料AC - 13开展了连续式交变正弦波形加载的小梁拉压疲劳试验.依据损伤力学基本理论,采用唯象学方法分析了沥青混合料的拉压疲劳损伤特性.介绍了拉压疲劳试验方法及影响因素,根据疲劳试验结果得到了拉压疲劳方程;基于弹性模量定义的损伤变量,建立了拉压疲劳损伤模型,拟合疲劳试验结果确定了损伤参数,获得了考虑应力水平的拉压疲劳损伤演化方程.研究结果表明:疲劳损伤参数α、β随应力水平增大而增大,且近似呈线性关系;拉压疲劳损伤演化大致呈3阶段变化规律,即损伤萌生、损伤稳定增长和损伤失稳破坏阶段;应力水平越大的损伤演化曲线越靠下,随寿命比变化疲劳损伤演化速度越缓和.%In order to understand the fatigue damage characteristics of the actual structure of asphalt pavement under tension and compression stress, the tension-compression fatigue test of beam under continuous sine wave alternating loading for AC-13 was conducted. Based on the basic theory of damage mechanics, the tension-compression fatigue damage characteristics of asphalt mixtures were studied using phenomenology. The tension-compression fatigue test method and influencing factors were introduced, and the tensioncompression fatigue equation was established by fatigue test results. Based on the damage variable defined by elastic modulus, the tension-compression fatigue damage model was established. The damage parameters were determined by fitting the fatigue test data, and the tension-compression fatigue damage evolution equation regarding to the stress level was built. The results show that (1) fatigue damage parameters a and β increased with stress level, and the relationship between the damage parameters and the stress level was linear; (2) tension-compression fatigue damage evolution was

  17. Thermal behavior of asphalt cements

    International Nuclear Information System (INIS)

    Asphalt cements are highly complex mixtures of hydrocarbon molecules whose thermal behavior is of prime importance for petroleum and road industry. From DSC, the determination of several thermal properties of asphalts is given, e.g. glass-transition temperature and crystallized fraction content.The dissolution of a pure n-paraffin CnH2n+2 in an asphalt, as seen by DSC, should be a single peak. For 20g of these glasses change with time and temperature. The formation of the crystallized phases is superposed to the enthalpic relaxation of the glasses, making a kinetic study very difficult. (Copyright (c) 1998 Elsevier Science B.V., Amsterdam. All rights reserved.)

  18. Primary research on emulsified asphalt cold recycled mixture added recycled materials of base course%乳化沥青复合冷再生混合料研究

    Institute of Scientific and Technical Information of China (English)

    任瑞波; 朱树青; 徐强; 马川义

    2015-01-01

    路面基层废旧料的研究利用可节约工程建设成本,缓解路面养护带来的资源和环境压力。文章通过对路面基层与面层废旧材料分析与设计,确定最佳含水率与合适沥青用量,通过劈裂试验和冻融试验,评价掺加基层废旧料的乳化沥青复合冷再生混合料的性能。结果表明:矿料类型对乳化沥青冷再生混合料最佳含水率和劈裂强度影响较大;在低油量范围内,掺加基层废旧料的乳化沥青复合冷再生混合料劈裂强度较高,具有一定的抗弯拉能力和抗水损害能力,抗冻融能力一般;乳化沥青复合冷再生混合料具有感温性,属于粘弹性材料;掺加基层废旧料乳化沥青复合冷再生混合料性能够基本满足再生技术规范使用要求。%The utilization of old base course materials could save the cost of engineering construction and ease the pressure for resources and environment in pavement maintenance. Based on these,the research on RAP of base course was conducted. Material analysis and grade design were executed to determine the optimum moisture content and appropriate asphalt content and relatively performance tests were carried out under the optimum moisture and suitable asphalt content. Tests results show that mineral aggregate type of emulsified asphalt cold recycled mixture had a greater influence on the best moisture content and the splitting strength;emulsified asphalt cold recycled mixture mixed with the materials of base course has certain flexural tensile strength to resistant bending and water damage;the ability of mixture is normal to resist freezing and thawing;the composite materials is sensitive to temperature which said it belong to viscous-elastic material;the composite materials meet technical requirement of cold recycled mixture using on lower layers of pavement.

  19. 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.

  20. 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.

  1. ALGORITHM OF CHOOSING ASPHALT MIXING PLANTS

    OpenAIRE

    Zhukov, P.; Kravchuk, Y.; Zhukov, D.

    2010-01-01

    The development of transport infrastructure, which must conform to European standards and in its turn requires the development of road economy, is one of the ways out of the crisis. The development of road economy requires either construction of asphalt-concrete mixture plants or their modernization, or reconstruction of existing plants. Any reconstruction or modernization and, moreover, construction of new asphalt-concrete plants requires the optimization of choosing the most efficient aspha...

  2. 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.

  3. Reinforcement of Recycled Foamed Asphalt Using Short Polypropylene Fibers

    Directory of Open Access Journals (Sweden)

    Yongjoo Kim

    2013-01-01

    Full Text Available This paper presents the reinforcing effects of the inclusion of short polypropylene fibers on recycled foamed asphalt (RFA mixture. Short polypropylene fibers of 10 mm length with a 0.15% by weight mixing ratio of the fiber to the asphalt binder were used. The Marshall stability test, the indirect tensile strength test, the resilient modulus test, and wheel tracking test of the RFA mixtures were conducted. The test results were compared to find out the reinforcing effects of the inclusion of the fiber and the other mixtures, which included the conventional recycled foamed asphalt (RFA mixtures; the cement reinforced recycled foamed asphalt (CRFA mixtures; the semihot recycled foamed asphalt (SRFA mixtures; and recycled hot-mix asphalt (RHMA mixtures. It is found that the FRFA mixture shows higher Marshall stability than the RFA and SRFA mixtures, higher indirect tensile strength than the RFA mixture, and higher rut resistance than the RFA, SRFA, and RHMA mixtures as seen from the wheel tracking test.

  4. 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 ...

  5. Modelling and Laboratory Studies on the Adhesion Fatigue Performance for Thin-Film Asphalt and Aggregate System

    OpenAIRE

    Dongsheng Wang; Junyan Yi; Decheng Feng

    2014-01-01

    Adhesion between asphalt and aggregate plays an important role in the performance of asphalt mixtures. A low-frequency adhesion fatigue test was proposed in this paper to study the effect of environment on the asphalt-aggregate adhesion system. The stress-based fatigue model had been utilized to describe the fatigue behavior of thin-film asphalt and aggregate system. The factors influencing the adhesion fatigue performance were also investigated. Experiment results show that asphalt has more ...

  6. 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。

  7. 石棉尾矿用作沥青混合料集料特性研究%Research on character of asbestos tailing using as asphalt mixture aggregate

    Institute of Scientific and Technical Information of China (English)

    李军; 徐林荣; 刘小明

    2011-01-01

    A large amount of asbestos tailing stacked near Yaan - Lugu Highway from K112 to K145 mileage for more than 30 years which can cause hidden disaster to the project such as latent landslide, mud - rock and so on. Using asbestos tailing for highway projects, can not only remove security risks, and also can make use of waste material, which has important significance. In order to use asbestos tailing as asphalt mixture aggregate in the pavement surface, we selected the AC - 20C mixture in the Marshall, wheel rut, freezing, thawing cleavage and other experiments, and evaluated the performance of asbestos tailing asphalt mixture in the high temperature, the low temperature, and the water stablity. The result indicated that, the asbestos tailing asphalt mixture road satisfies with the requirement of performance index, simultaneously it provides a way for comprehensive utilization of the asbestos tailing.%雅泸高速公路K112 ~ K145里程附近囤积了30余年石棉矿的废渣,对工程可能存在滑坡、泥石流等灾害隐患,将石棉尾矿用于公路工程中,不仅可以消除安全隐患,而且使废物得以利用,具有重要意义.为将石棉尾矿用作路面沥青混合料集料,采用AC - 20C型混合料,通过马歇尔、车辙、冻融劈裂等试验,评价了石棉尾矿沥青混合料高温、低温、水稳定性能.结果表明:石棉尾矿沥青混合料路用性能各项指标均满足要求,同时为石棉尾矿综合利用提供了一条途径.

  8. Determination of polycyclic aromatic hydrocarbons in fractions in asphalt mixtures using liquid chromatography coupled to mass spectrometry with atmospheric pressure chemical ionization.

    Science.gov (United States)

    Nascimento, Paulo Cicero; Gobo, Luciana Assis; Bohrer, Denise; Carvalho, Leandro Machado; Cravo, Margareth Coutinho; Leite, Leni Figueiredo Mathias

    2015-07-01

    An analytical method using liquid chromatography coupled to mass spectrometry with atmospheric pressure chemical ionization for the determination of polycyclic aromatic hydrocarbons in asphalt fractions has been developed. The 14 compounds determined, characterized by having two or more condensed aromatic rings, are expected to be present in asphalt and are considered carcinogenic and mutagenic. The parameters of the atmospheric pressure chemical ionization interface were optimized to obtain the highest possible sensitivity for all of the compounds. The limits of detection ranged from 0.5 to 346.5 μg/L and the limits of quantification ranged from 1.7 to 1550 μg/L. The method was validated against a diesel particulate extract standard reference material (NIST SRM 1975), and the obtained concentrations agreed with the certified values. The method was applied to asphalt samples after its fractionation according to ASTM D4124 and the method of Green. The concentrations of the seven polycyclic aromatic hydrocarbons quantified in the sample ranged from 0.86 mg/kg for benzo[ghi]perylene to 98.32 mg/kg for fluorene. PMID:25885756

  9. 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.

  10. Multiscale Constitutive Modeling of Asphalt Concrete

    Science.gov (United States)

    Underwood, Benjamin Shane

    Multiscale modeling of asphalt concrete has become a popular technique for gaining improved insight into the physical mechanisms that affect the material's behavior and ultimately its performance. This type of modeling considers asphalt concrete, not as a homogeneous mass, but rather as an assemblage of materials at different characteristic length scales. For proper modeling these characteristic scales should be functionally definable and should have known properties. Thus far, research in this area has not focused significant attention on functionally defining what the characteristic scales within asphalt concrete should be. Instead, many have made assumptions on the characteristic scales and even the characteristic behaviors of these scales with little to no support. This research addresses these shortcomings by directly evaluating the microstructure of the material and uses these results to create materials of different characteristic length scales as they exist within the asphalt concrete mixture. The objectives of this work are to; 1) develop mechanistic models for the linear viscoelastic (LVE) and damage behaviors in asphalt concrete at different length scales and 2) develop a mechanistic, mechanistic/empirical, or phenomenological formulation to link the different length scales into a model capable of predicting the effects of microstructural changes on the linear viscoelastic behaviors of asphalt concrete mixture, e.g., a microstructure association model for asphalt concrete mixture. Through the microstructural study it is found that asphalt concrete mixture can be considered as a build-up of three different phases; asphalt mastic, fine aggregate matrix (FAM), and finally the coarse aggregate particles. The asphalt mastic is found to exist as a homogenous material throughout the mixture and FAM, and the filler content within this material is consistent with the volumetric averaged concentration, which can be calculated from the job mix formula. It is also

  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. Performance experiments of carbon fiber-reinforced conductive SBS modified asphalt mixture%碳纤维导电SBS改性沥青混合料性能试验

    Institute of Scientific and Technical Information of China (English)

    查旭东; 蔡良; 曹艳霞

    2014-01-01

    In order to analyze pavement performances and ice-melting effects of conductive asphalt concrete,the chopped polyacrylonitrile-based carbon fibers were incorporated into SBS modified asphalt mixture AC-13C to prepare the carbon fiber-reinforced conductive modified asphalt mixtures.Five kinds of carbon fiber contents were selected respectively to conduct the laboratory experiments such as mix ratio design,pavement performances and simulated ice-melting etc.The results show,with the increase of carbon fiber content,the optimum asphalt-aggregate ratios of SBS modified asphalt mixture increase linearly;the dy-namic stability,the immersion residual Marshall stability and the freeze-thaw split strength ratios change in parabolic relationship;the low-temperature flexural-tensile strengths and the failure strains increase in"S"curve,but the stiffness moduli decrease in"Z"curve.It il-lustrates when the proper carbon fibers were incorporated into the SBS modified asphalt mixture,the pavement performances such as high-temperature anti-rutting,low-tempera-ture anti-cracking and moisture damage resistance etc can be improved because of the bridg-ing,reinforced and toughening effects of carbon fiber.However,the excessive carbon fibers can cause the decrease of enhancement effect because of poor dispersion and easy cluster. Simultaneously,when the carbon fiber contents are more than 0.3%,the carbon fibers in-side mixtures are lapped each other to form the good conductive network with the fine ice-melting results.On the whole,when the carbon fiber content is 0.4%,the pavement per-formances,the electrical conductivity and the ice-melting efficiency of carbon fiber-rein-forced SBS modified asphalt mixture are the best.%为了分析导电沥青混凝土的路用性能和融冰效果,将短切聚丙烯腈基碳纤维掺入 SBS改性沥青混合料 AC-13 C中,制备成碳纤维导电改性沥青混合料。选取5种碳纤维掺量分别进行了配合比设计、路用性能和模拟

  13. Percolation Model of Graphite-modified Asphalt Concrete

    Institute of Scientific and Technical Information of China (English)

    MO Liantong; WU Shaopeng; LIU Xiaoming; CHEN Zheng

    2005-01-01

    The addition of graphite powder in conventional asphalt mixture can produced asphalt concrete with excellent electrical performance. Percolation theory was employed to discuss the relation between the conductivity and graphite content of graphite-modified asphalt concrete. It was found that the results of percolation model are consistent with experimental values. The percolation threshold of graphite-modified asphalt concrete is 10.94% graphite content account for the total volume of the binder phase consisting of asphalt and graphite. The critical exponent is 3.16, beyond the range of 1.6-2.1 for the standard lattice continuous percolation problem. Its reason is that the tunnel conduction mechanism originates near the critical percent content, which causes this system to be not universal. Tunnel mechanism is demonstrated by the nonlinear voltage-current characteristic near percolation threshold.The percolation model is able to well predict the formation and development of conductive network in graphite-modified asphalt concrete.

  14. Performance of Recycled Porous Hot Mix Asphalt with Gilsonite Additive

    Directory of Open Access Journals (Sweden)

    Ludfi Djakfar

    2015-01-01

    Full Text Available The objective of the study is to evaluate the performance of porous asphalt using waste recycled concrete material and explore the effect of adding Gilsonite to the mixture. As many as 90 Marshall specimens were prepared with varied asphalt content, percentage of Gilsonite as an additive, and proportioned recycled and virgin coarse aggregate. The test includes permeability capability and Marshall characteristics. The results showed that recycled concrete materials seem to have a potential use as aggregate in the hot mix asphalt, particularly on porous hot mix asphalt. Adding Gilsonite at ranges 8–10% improves the Marshall characteristic of the mix, particularly its stability, without decreasing significantly the permeability capability of the mix. The use of recycled materials tends to increase the asphalt content of the mix at about 1 to 2% higher. With stability reaching 750 kg, the hot mix recycled porous asphalt may be suitable for use in the local roads with medium vehicle load.

  15. Hot Mix Asphalt Recycling: Practices and Principles

    OpenAIRE

    Mohajeri, M.

    2015-01-01

    Hot mix asphalt recycling has become common practice all over the world since the 1970s because of the crisis in oil prices. In the Netherlands, hot recycling has advanced to such an extent that in most of the mixtures more than 50% of reclaimed asphalt (RA) is allowed. These mixtures with such a high RA content are produced in a batch plant to which a parallel drum is attached. In this drum RA is pre-heated to approximately 130°C. Since 2007 another hot mix recycling techniques became availa...

  16. Determination of oxygen and nitrogen derivatives of polycyclic aromatic hydrocarbons in fractions of asphalt mixtures using liquid chromatography coupled to mass spectrometry with atmospheric pressure chemical ionization.

    Science.gov (United States)

    Nascimento, Paulo Cicero; Gobo, Luciana Assis; Bohrer, Denise; Carvalho, Leandro Machado; Cravo, Margareth Coutinho; Leite, Leni Figueiredo Mathias

    2015-12-01

    Liquid chromatography coupled to mass spectrometry with atmospheric pressure chemical ionization was used for the determination of polycyclic aromatic hydrocarbon derivatives, the oxygenated polycyclic aromatic hydrocarbons and nitrated polycyclic aromatic hydrocarbons, formed in asphalt fractions. Two different methods have been developed for the determination of five oxygenated and seven nitrated polycyclic aromatic hydrocarbons that are characterized by having two or more condensed aromatic rings and present mutagenic and carcinogenic properties. The parameters of the atmospheric pressure chemical ionization interface were optimized to obtain the highest possible sensitivity for all compounds. The detection limits of the methods ranged from 0.1 to 57.3 μg/L for nitrated and from 0.1 to 6.6 μg/L for oxygenated derivatives. The limits of quantification were in the range of 4.6-191 μg/L for nitrated and 0.3-8.9 μg/L for oxygenated derivatives. The methods were validated against a diesel particulate extract standard reference material (National Institute of Standards and Technology SRM 1975), and the obtained concentrations (two nitrated derivatives) agreed with the certified values. The methods were applied in the analysis of asphalt samples after their fractionation into asphaltenes and maltenes, according to American Society for Testing and Material D4124, where the maltenic fraction was further separated into its basic, acidic, and neutral parts following the method of Green. Only two nitrated derivatives were found in the asphalt sample, quinoline and 2-nitrofluorene, with concentrations of 9.26 and 2146 mg/kg, respectively, whereas no oxygenated derivatives were detected. PMID:26446274

  17. Application of Superpave Asphalt Mixture Design%Superpave沥青混合料设计法在工程中的应用

    Institute of Scientific and Technical Information of China (English)

    赵广德; 潘大民; 李云芳

    2008-01-01

    @@ Superpave沥青混合料设计法 概述 1989-1992年美国实施了著名的公路战略研究计划,其中的一项重大研究成果就是Superpave(Superior Performing Asphalt Pavements)--高性能沥青路面技术. 我国现行沥青混合料设计方法是马歇尔稳定度试验方法,包括以下内容.

  18. 盐冻循环对胶粉改性沥青混合料性能的影响%The Influence that Salt Freezing Cycles have on the Property of Rubber Powder Modified Asphalt Mixture

    Institute of Scientific and Technical Information of China (English)

    冯蕾; 王乐; 崔亚楠; 韩吉伟; 阴福

    2014-01-01

    In winter of cold region,pavements are easily frozen by snow and ice and deicing salt is often used for to melt ice.However,the use of deicing salt can produce erosion of pavement materials.In this article,the freeze-thaw cycle test was conducted to analysis the influence that salt freeze-thaw cycles had on porosity of rubber powder modified asphalt mixture.Temperature,concentration of deicing salt and the number of freeze-thaw cycles were considered in the test.The test was carried out in accordance with the orthogonal principle.The porosity and splitting strength of the specimens were got during the test.It was found that with the increase of salt concentration and the freeze-thaw cycles,porosity of rubber pow-der modified asphalt mixture increased gradually.It showed that deicing salt causes serious damage to the rubber powder modified asphalt of pavement and it is unfavorable to use in a large amount.%冬季寒冷地区路面易积雪结冰,常使用除冰盐进行融雪除冰。除冰盐的使用会对路面材料产生侵蚀。本文通过室内冻融循环试验分析盐冻融循环对胶粉改性沥青混合料的性能的影响。实验中考虑了温度、除冰盐浓度和冻融循环次数三个因素,按照正交原理进行试验,试验测得了试件的孔隙率和劈裂强度。经分析发现,随着盐浓度和冻融循环次数的增加,胶粉改性沥青混合料的孔隙率逐渐变大。说明冬季路面使用的除冰盐对胶粉改性沥青的破坏较严重,不宜大量使用。

  19. 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.

  20. Probe into Construction Technology and Quality Control of Plant-mix Thermal Recycling Asphalt Mixture%厂拌热再生沥青混合料施工工艺及质量控制探讨

    Institute of Scientific and Technical Information of China (English)

    何柳

    2016-01-01

    介绍厂拌热再生沥青混合料的生产、摊铺全过程施工工艺,探讨从RAP料的破碎、筛分、存储到再生混合料的拌和、运输、摊铺和碾压各环节质量控制措施,分析各个施工环节对厂拌热再生混合料质量的影响.分析结果对类似材料的实际应用具有参考作用.%This paper introduces construction technology in the whole process of production and pavement of plant -mix thermal recycling asphalt mixture,probes into quality control measures in all parts from crushing,screening and storage of RAP material to mixing, transportation, pavement and rolling compaction of recycling mixture,and analyzes influences of all construction parts on the quality of plant-mix thermal recycling mixture.The results of analysis provides a reference for practical application of similar materials.

  1. Modified rubberized stone matrix asphalt for Nineveh roads

    Institute of Scientific and Technical Information of China (English)

    Al-Hadidy AI; TAN Yi-qiu

    2008-01-01

    To evaluate the effects of Crumb Rubber Modifiers (CRMS) on basic engineering properties (i. e.Marshall, tensile strength, and compressive strength) of stone matrix asphalt mixtures, the ASTM testing and procedures were employed. Results of the evaluation were used to quantify the effect of CRM source and CRM content on engineering properties at testing temperatures of 25℃and 60℃. Statistical models were developed, which represent the nature of effects on performance-related properties of stone matrix asphalt mixtures.

  2. High Modulus Asphalt Concrete with Dolomite Aggregates

    Science.gov (United States)

    Haritonovs, V.; Tihonovs, J.; Smirnovs, J.

    2015-11-01

    Dolomite is one of the most widely available sedimentary rocks in the territory of Latvia. Dolomite quarries contain about 1,000 million tons of this material. However, according to Latvian Road Specifications, this dolomite cannot be used for average and high intensity roads because of its low quality, mainly, its LA index (The Los Angeles abrasion test). Therefore, mostly the imported magmatic rocks (granite, diabase, gabbro, basalt) or imported dolomite are used, which makes asphalt expensive. However, practical experience shows that even with these high quality materials roads exhibit rutting, fatigue, and thermal cracks. The aim of the research is to develop a high performance asphalt concrete for base and binder courses using only locally available aggregates. In order to achieve resistance against deformations at a high ambient temperature, a hard grade binder was used. Workability, fatigue and thermal cracking resistance, as well as sufficient water resistance is achieved by low porosity (3-5%) and higher binder content compared to traditional asphalt mixtures. The design of the asphalt includes a combination of empirical and performance based tests, which in laboratory circumstances allow simulating traffic and environmental loads. High performance AC 16 base asphalt concrete was created using local dolomite aggregate with polymer modified (PMB 10/40-65) and hard grade (B20/30) bitumen. The mixtures were specified based on fundamental properties in accordance with EN 13108-1 standard.

  3. 水泥粉煤灰稳定废旧沥青混合料的收缩特性%Shrinkage Characteristics of Cement and Fly-ash Stabilized Waste Asphalt Mixture

    Institute of Scientific and Technical Information of China (English)

    张大勇; 杨林; 刘广环

    2011-01-01

    To use the waste asphalt mixture as road base rationally, the shrinkage characteristics of cement and fly-ash stabilized waste asphalt mixture is studied. Through the orthogonal experimental design and the drying shrinkage test, shrinkage test methods, the characteristics of drying shrinkage and temperature shrinkage are studied. The result shows that, in dry shrinkage test, the drying strain and coefficient increase with exposure time and water loss rate proportionally. When the ratio of cement to fly-ash is 1: 3, the shrinkage strain and shrinkage coefficient are minimum. During the temperature shrinkage test, the temperature shrinkage strain and shrinkage coefficient increase as the stabilizers increases linearly, and increases as the temperature decreases. By range analysis and variance analysis of the orthogonal experimental design method to determine the levels of factors to evaluate the shrinkage characteristics of mixture between the four factors. The analysis shows; the order of the shrinkage influence factors is the asphalt content > 1# to 3# coarse aggregate > fly ash content > cement content.%为了合理利用废旧沥青混合料作为路面基层,研究其收缩特性,以水泥、粉煤灰稳定废旧沥青混合料为研究对象,通过正交试验设计和干燥收缩试验、温度收缩试验等方法,对其干燥收缩特性和温度收缩特性进行了试验研究.结果表明:干缩试验中,混合料的干缩应变与干缩系数均与暴露时间、失水率的增多成正比,水泥粉煤灰的比值在l:3时混合料干缩应变与干缩系数最小.温缩试验中,混合料的温缩应变与温缩系数随着稳定剂剂量的增加而线性增长,并随着温度的降低而增大.同时采用正交试验设计方法中的极差分析和方差分析来确定因素水平变化,评价了影响混合料收缩特性4个因素的大小关系与显著性,分析表明:其收缩性能影响因素的排序为废旧沥青混合料含量>1~3号

  4. Fatigue Performance of Asphalt Mixture Under Tensile-compressive Alternating Loading%拉-压交变荷载下沥青混合料的疲劳性能

    Institute of Scientific and Technical Information of China (English)

    董忠红; 张扬; 吕彭民

    2013-01-01

    To study the effect of tensile-compressive alternating loading on the fatigue damage of asphalt mixture, a new kind of loading device was developed. Taking AC-25F and AC-16C as research targets, fatigue tests at various loadings and stress ratios were conducted. The effect of the loading level and compressive strain on the fatigue performance of asphalt mixture was analyzed. A fatigue prediction model was set up which would consider the influence of compressive stress based on the test data. The results show that there is a logarithmic linear relationship between the fatigue life and tension stress; however, the compressive stress significantly extends the fatigue life of asphalt mixture; for AC-25F, the fatigue life at the stress ratio of -0. 5, -0. 3 and -0. 1 is 2. 52 times, 1. 53 times and 1. 03 times of the fatigue life at the stress ratio of 0. 1 respectively; for AC-16C, it is 4. 90 times, 3. 31 times and 2. 30 times respectively. The fatigue prediction model effectively makes up for the defects of the existing models which only consider the influence of compressive stress, and can provide a reference for pavement structure design and fatigue prediction.%为了研究交变力学状态下沥青混合料的疲劳性能,开发专用加载设备,选择AC-25F和AC-16C两种材料作为研究对象,进行不同荷载级别和不同应力比下的疲劳试验,分析荷载级别和压应变对沥青混合料疲劳行为的影响,并建立考虑压应力影响的疲劳预估模型.结果表明:各种应力比下,沥青混合料疲劳寿命与拉应力呈对数线性关系,但压应力显著延长了材料的疲劳寿命.对于AC-25F,其在应力比为-0.5,-0.3,-0.1时的疲劳寿命分别为应力比0.1时的2.52倍、1.53倍和1.03倍;对于AC-16C,相应的疲劳寿命则分别为应力比0.1时的4.90倍、3.31倍和2.30倍;所建立的考虑压应力影响的疲劳预估模型可有效弥补现有模型仅考虑拉应力作用的缺陷,为路面结构设计和疲劳预估提供参考.

  5. 橡胶粉掺量对胶粉改性沥青混合料高温性能的影响研究%The impact study of rubber powder content on rubber powder modiifed asphalt mixture high temperature performance

    Institute of Scientific and Technical Information of China (English)

    黄卫东; 高磊; 施晓强

    2014-01-01

    为分析橡胶粉掺量对胶粉改性沥青混合料高温性能的影响,本文选取五种掺量(15%、18%、21%、24%及27%,内掺)对基质沥青分别改性,对其成型的橡胶沥青混合料进行车辙试验和静态蠕变试验以评价掺量对高温性能的影响,设计级配为AR-AC13。试验结果表明,随着橡胶粉掺量的增加,橡胶沥青混合料高温性能先提高后下降,在掺量为24%时达到最佳。%For the analysis of rubber powder content on the influence of the high temperature performance of rubber powder modified asphalt mixture, this article selected five content (15%, 18%, 21%, 24%and 18%) rubber powder to modified matrix asphalt respectively, then rutting test and static creep test were carried of five different rubber asphalt mixture to assess properties of high temperature, the design gradation of mixtures was AR-AC13.The test results showed that with the increase of rubber powder content, the high temperature performance of rubber asphalt mixture was enhanced first and then dropped after, when content is 24%, the high temperature performance was best.

  6. 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…

  7. Mixture

    Directory of Open Access Journals (Sweden)

    Silva-Aguilar Martín

    2011-01-01

    Full Text Available Metals are ubiquitous pollutants present as mixtures. In particular, mixture of arsenic-cadmium-lead is among the leading toxic agents detected in the environment. These metals have carcinogenic and cell-transforming potential. In this study, we used a two step cell transformation model, to determine the role of oxidative stress in transformation induced by a mixture of arsenic-cadmium-lead. Oxidative damage and antioxidant response were determined. Metal mixture treatment induces the increase of damage markers and the antioxidant response. Loss of cell viability and increased transforming potential were observed during the promotion phase. This finding correlated significantly with generation of reactive oxygen species. Cotreatment with N-acetyl-cysteine induces effect on the transforming capacity; while a diminution was found in initiation, in promotion phase a total block of the transforming capacity was observed. Our results suggest that oxidative stress generated by metal mixture plays an important role only in promotion phase promoting transforming capacity.

  8. 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.

  9. Dynamic Mechanical Characterizations and Road Performances of Flame Retardant Asphalt Mortars and Concretes

    Institute of Scientific and Technical Information of China (English)

    QIN Xiantao; ZHU Siyue; LI Zuzhong; CHEN Shuanfa

    2015-01-01

    To research the dynamic mechanical properties and road performances of flame retardant asphalt mortars and mixtures, four different asphalt mortars/mixtures were prepared: a reference group and three asphalt mortars/mixtures containing composite lfame retardant materials (M-FRs) of different proportions. Temperature sweep, frequency sweep, repeated creep test, force ductility test and bending beam rheological test were carried out to research the dynamic mechanical properties of asphalt mortars containing M-FRs; wheel-tracking test, low-temperature bending test and freeze-thaw split test were used to study the road performances of asphalt mixtures containing M-FRs. The results show that high-temperature performances of the three lfame retardant asphalt mortars improve greatly, while low-temperature cracking resistances decline. Both high-temperature performances and water stabilities of asphalt mixtures containing M-FRs are quite good and exceed the speciifcation requirements. However, their low-temperature performances decline in different degrees. In summary, besides their good lfame retardancy, the lfame retardant asphalt mortars and mixtures also exhibit acceptable road performance.

  10. Performance of Recycled Porous Hot Mix Asphalt with Gilsonite Additive

    OpenAIRE

    Ludfi Djakfar; Hendi Bowoputro; Bangun Prawiro; Nugraha Tarigan

    2015-01-01

    The objective of the study is to evaluate the performance of porous asphalt using waste recycled concrete material and explore the effect of adding Gilsonite to the mixture. As many as 90 Marshall specimens were prepared with varied asphalt content, percentage of Gilsonite as an additive, and proportioned recycled and virgin coarse aggregate. The test includes permeability capability and Marshall characteristics. The results showed that recycled concrete materials seem to have a potential...

  11. 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...

  12. 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.

  13. 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

  14. Asphalt rubber mixtures with warm mix asphalt additives

    OpenAIRE

    Rodríguez Alloza, Ana María

    2015-01-01

    En los últimos años, debido a la creciente preocupación por el calentamiento global y el cambio climático, uno de los retos más importantes a los que se enfrenta nuestra sociedad es el uso eficiente y económico de energía así como la necesidad correspondiente de reducir los gases de efecto invernadero (GEI). Las tecnologías de mezclas semicalientes se han convertido en un nuevo e importante tema de investigación en el campo de los materiales para pavimentos ya que ofrece una solución potencia...

  15. 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 ...

  16. 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...

  17. Analysis of Adhesive Characteristics of Asphalt Based on Atomic Force Microscopy and Molecular Dynamics Simulation.

    Science.gov (United States)

    Xu, Meng; Yi, Junyan; Feng, Decheng; Huang, Yudong; Wang, Dongsheng

    2016-05-18

    Asphalt binder is a very important building material in infrastructure construction; it is commonly mixed with mineral aggregate and used to produce asphalt concrete. Owing to the large differences in physical and chemical properties between asphalt and aggregate, adhesive bonds play an important role in determining the performance of asphalt concrete. Although many types of adhesive bonding mechanisms have been proposed to explain the interaction forces between asphalt binder and mineral aggregate, few have been confirmed and characterized. In comparison with chemical interactions, physical adsorption has been considered to play a more important role in adhesive bonding between asphalt and mineral aggregate. In this study, the silicon tip of an atomic force microscope was used to represent silicate minerals in aggregate, and a nanoscale analysis of the characteristics of adhesive bonding between asphalt binder and the silicon tip was conducted via an atomic force microscopy (AFM) test and molecular dynamics (MD) simulations. The results of the measurements and simulations could help in better understanding of the bonding and debonding procedures in asphalt-aggregate mixtures during hot mixing and under traffic loading. MD simulations on a single molecule of a component of asphalt and monocrystalline silicon demonstrate that molecules with a higher atomic density and planar structure, such as three types of asphaltene molecules, can provide greater adhesive strength. However, regarding the real components of asphalt binder, both the MD simulations and AFM test indicate that the colloidal structural behavior of asphalt also has a large influence on the adhesion behavior between asphalt and silicon. A schematic model of the interaction between asphalt and silicon is presented, which can explain the effect of aging on the adhesion behavior of asphalt. PMID:27115043

  18. Damage detection and artificial healing of asphalt concrete after trafficking with a load simulator

    Science.gov (United States)

    Bueno, M.; Arraigada, M.; Partl, M. N.

    2016-08-01

    Artificial healing of asphalt concrete by induction heating requires the addition of electrically conductive and/or magnetic materials into the asphalt mixture. Hence, bitumen can be heated up by an alternating electromagnetic field, decreasing therefore its viscosity and allowing it to flow for closing cracks and recover bonding among the mineral aggregates.

  19. 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.

  20. Desempenho mecânico de misturas asfálticas confeccionadas com agregados sintéticos de argila calcinada Mechanical performance of asphalt mixtures composed of synthetic calcinated clay aggregates

    Directory of Open Access Journals (Sweden)

    C. A. Frota

    2007-09-01

    .A substantial number of municipal districts in the State of Amazonas are located in areas which are poor in stony materials. And this has led pavement builders into adopting alternatives which have historically produced pavements with low mechanical strength. Whist more effective and appropriate from a technical standpoint, the asphalt concrete has been usually left aside due to the referred lack of stony materials. Because of the specific situation in the State of Amazonas the adoption of synthetic calcinated clay aggregates (SCCA, with an abundant raw material (clay in the State of Amazonas is recommended in lieu of the traditional practice. Previous works carried out by the Federal University of Amazonas Geotechny Group have demonstrated that the clay soil commonly used in the production of ceramic materials can yield synthetic aggregates with adequate mechanical properties. In this research work, samples featuring similar characteristics as those of the soils in question have been found along the BR-319 highway connecting the Manaus (AM city to Porto Velho (RO city. The transportation structure in general is in deplorable conditions. Justifiably so, the recovery of this highway has been earmarked as one of the targets for the Ministry of Transportation. In this study, asphalt mixtures were blended with synthetic aggregates and pebbles taken from the river bed in order to compare the mechanical performance of such mixtures by means of the determination of the resilient modulus (RM. The results, as a rule, have shown that the asphalt mixtures comprising synthetic calcinated clay aggregates when compared with those comprising the naturally-found material (river bed pebbles have shown: (a greater tensile and resilient modulus strengths; (b low deformation tendency, as well as a considerable elastic recovery and (c less susceptibility to permanent deformation.

  1. Deformation Properties and Fatigue of Bituminous Mixtures

    Directory of Open Access Journals (Sweden)

    Frantisek Schlosser

    2013-01-01

    Full Text Available Deformation properties and fatigue performance are important characteristics of asphalt bound materials which are used for construction of pavement layers. Viscoelastic asphalt mixtures are better characterized via dynamic tests. This type of tests allows us to collate materials with regard to axle vibrations which lie usually in the range of 6 Hz–25 Hz for standard conditions. Asphalt modified for heat sensitivity in the range from −20°C to +60°C has significant impact on the overall characteristics of the mixture. Deformation properties are used as inputs for empirical mixture design, and fatigue performance of asphalt mixtures reflects the parameters of functional tests. Master curves convey properties of asphalt mixtures for various conditions and allow us to evaluate them without the need of time expensive testing.

  2. 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)

  3. 沥青混合料车辙进程影响因素及预估模型研究%Research on Influencing Factors and Prediction Model of Rutting Process for Asphalt Mixture

    Institute of Scientific and Technical Information of China (English)

    栗培龙; 李洪华; 张争奇; 王秉纲

    2011-01-01

    采用汉堡车辙试验系统进行车辙试验,分析荷载作用次数、试件厚度、温度、混合料力学性能对沥青混合料车辙进程的影响,建立了以上影响因子与车辙深度的关系,并建立了沥青混合料车辙预估模型;通过AC-13、AC-16和AC-20这3种混合料、40℃、50℃、60℃3种温度下的大量室内车辙试验数据确定了模型参数.结果表明,车辙深度与荷载作用次数呈秉幂关系增加,与温度呈指数关系增长,与混合料重复加载试验力学性能参数εp/Fn呈乘幂关系,而与试件厚度关系不显著,根据建立的车辙预估模型得到的车辙预估值与实测值误差基本不超过士10%,进而通过9条路段的车辙实际调研数据对模型参数进行了修正,得到了实际路面车辙预估模型,可以为路面混合料设计提供参考.%Hamburg wheel tracking test was conducted to analyze the influence of load cycles, specimen thickness, test temperature and mechanical properties of asphalt mixture on the rut process of mixture. According to the relationships between these factors and rut depths, a rut prediction model was established. Three kinds of mixtures (AC-13, AC-16 and AC-20) were prepared and rut tests were carried out under the three temperatures of 40 'C , 50 'C and 60 'C. And the model parameters were determined by fitting the rut and mechanical performance test data. The results indicate that rut depth increases with load cycles by a power relationship, grows exponentially with temperature and shows power relationship with mechanical parameter of mixture for repeated loading test. But it has no significant relationship with specimen thickness. The error of prediction and measured rut depths is almost within ±10% by the established prediction model. The model parameters were amended according to the rut depth data from nine field pavement sections, and rut prediction model was gained, which can afford some references to mixture design.

  4. Using waste plastic bottles as additive for stone mastic asphalt

    International Nuclear Information System (INIS)

    Highlights: → The PET increased the stiffness level of the mixture improving its resistance level against permanent deformation. → The effects of waste PET on Marshall Stability, air void and bulk specific gravity of the mixture are significant. → The appropriate amount of PET was found to be 6% by weight of bitumen. -- Abstract: Currently, polymer modified asphalt mixture is a relatively costly mixture for paving roads. One way to reduce the cost of such constructions and rendering them more convenient is by using inexpensive polymers, i.e. waste polymers. The main purpose of this research is to determine the effect of incorporating waste plastic bottles (Polyethylene Terephthalate (PET)) on the engineering properties of stone mastic asphalt (SMA) mixture. The volumetric and mechanical properties of asphalt mixes that include various percentages of PET (0%, 2%, 4%, 6%, 8% and 10%) were calculated and assessed with laboratory tests. The appropriate amount of PET was found to be 6% by weight of bitumen. The outcomes were statistically analysed and the determination of the significance at certain confidence limits was performed with the two factor variance analysis (ANOVA). Moreover, some studies conducted on polyethylene modified asphalt mixture have also been taken into consideration in this paper. The results show that the addition of PET has a significant positive effect on the properties of SMA and it can promote the re-use of waste material in industry in an environmentally friendly and economical way.

  5. Reinforcement of Recycled Foamed Asphalt Using Short Polypropylene Fibers

    OpenAIRE

    Yongjoo Kim; Tae-Soon Park

    2013-01-01

    This paper presents the reinforcing effects of the inclusion of short polypropylene fibers on recycled foamed asphalt (RFA) mixture. Short polypropylene fibers of 10 mm length with a 0.15% by weight mixing ratio of the fiber to the asphalt binder were used. The Marshall stability test, the indirect tensile strength test, the resilient modulus test, and wheel tracking test of the RFA mixtures were conducted. The test results were compared to find out the reinforcing effects of the inclusion of...

  6. SYSTEM FOR CONTROLLING ELECTRIC DRIVE OF ASPHALT CONCRETE MIXING PLANT

    Directory of Open Access Journals (Sweden)

    A. S. Surmak

    2005-01-01

    Full Text Available It is proposed to evaluate quality of asphalt concrete mixture through definition of current component variable of a drive motor and measurement of its derivative sign. In order to carry out final determination of mixture uniformity a transducer on the basis of a nuclear magnetic resonance is applied. Block diagram of the system is presented and algorithm of its operation is given in the paper. In addition to improvement of the finished product quality the application of the system makes it possible to reduce bitumen consumption used for production of asphalt concrete.

  7. 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...

  8. 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...

  9. Characterization of asphalt materials containing bio oil from michigan wood

    Science.gov (United States)

    Mills-Beale, Julian

    The objective of this research is to develop sustainable wood-blend bioasphalt and characterize the atomic, molecular and bulk-scale behavior necessary to produce advanced asphalt paving mixtures. Bioasphalt was manufactured from Aspen, Basswood, Red Maple, Balsam, Maple, Pine, Beech and Magnolia wood via a 25 KWt fast-pyrolysis plant at 500 °C and refined into two distinct end forms - non-treated (5.54% moisture) and treated bioasphalt (1% moisture). Michigan petroleum-based asphalt, Performance Grade (PG) 58-28 was modified with 2, 5 and 10% of the bioasphalt by weight of base asphalt and characterized with the gas chromatography-mass spectroscopy (GC-MS), Fourier Transform Infra-red (FTIR) spectroscopy and the automated flocculation titrimetry techniques. The GC-MS method was used to characterize the Carbon-Hydrogen-Nitrogen (CHN) elemental ratio whiles the FTIR and the AFT were used to characterize the oxidative aging performance and the solubility parameters, respectively. For rheological characterization, the rotational viscosity, dynamic shear modulus and flexural bending methods are used in evaluating the low, intermediate and high temperature performance of the bio-modified asphalt materials. 54 5E3 (maximum of 3 million expected equivalent standard axle traffic loads) asphalt paving mixes were then prepared and characterized to investigate their laboratory permanent deformation, dynamic mix stiffness, moisture susceptibility, workability and constructability performance. From the research investigations, it was concluded that: 1) levo, 2, 6 dimethoxyphenol, 2 methoxy 4 vinylphenol, 2 methyl 1-2 cyclopentandione and 4-allyl-2, 6 dimetoxyphenol are the dominant chemical functional groups; 2) bioasphalt increases the viscosity and dynamic shear modulus of traditional asphalt binders; 3) Bio-modified petroleum asphalt can provide low-temperature cracking resistance benefits at -18 °C but is susceptible to cracking at -24 °C; 3) Carbonyl and sulphoxide

  10. Nuclear asphalt content gauge study. Research report (Final)

    International Nuclear Information System (INIS)

    This research ascertains if the Troxler Model 3241 Gauge could accurately determine the asphalt content of bituminous-concrete mixtures by nuclear means. The study was divided into three phases. Phase I was conducted in the Central Laboratory where a series of controlled tests were performed for variables that may effect the gauge's asphalt-content determinations. Phase II evolved into a cooperative study between the Maryland State Highway Administration (SHA) and several bituminous concrete producers. Phase III was to report the findings of the study and make a recommendation on the overall practical application of the gauge. The results indicate that the gauge can accurately determine asphalt contents on normal surface and base bituminous mixtures

  11. Research on the Microstructure and Property of an Anion Rubber Modified Asphalt

    OpenAIRE

    Wei Hong; Qingshan Li; Guoquan Guan; Youbo Di; Jing Sun; Tifeng Jiao; Guangzhong Xing

    2013-01-01

    The anion rubber modified asphalt (ARMA) mixture was first successfully developed with a unique process. In the development process, rubber and asphalt were mixed in the same proportion. Furthermore, the microstructure and modification mechanism of the material were characterized by SEM, FT-IR, TG, and XRD tests. The mechanical property of the mixture was also tested in accordance with the relevant standards. In the end, the material’s capacity of releasing anion was measured by DLY-6A232 atm...

  12. 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.

  13. USE OF CRUMB RUBBER FROM USED CAR TIRES IN MINERAL ASPHALT MIXES

    Directory of Open Access Journals (Sweden)

    Andrzej Plewa

    2014-11-01

    Full Text Available With the development of the automotive industry the disposal of used tires is constantly growing problem. Storage of waste rubber is associated with a very long period of decomposition of rubber in the natural conditions. Simultaneously new technologies are developed every year, which in the future may significantly promote recycling of this type of materials. The crumb rubbery modification of the road bitumen is the one of the environmentally safe solutions of rubbery decomposition. Improvement of resistance of the crumb rubbery modification of the road asphalt mixtures is the very important ecological aspect of the future. The article presents the results of research on the fatigue life resistance of asphalt concretes AC16P and AC22P with asphalt-rubber binders. The above analyses have been based on the results of tests of fatigue life of mineral-rubber-asphalt mixes determined by the method of prismatic four-point bending (4PB-PR. Mineral-rubber -asphalt mixes have been diversified according to the amount of the additive of rubber fines in asphalt-rubber binder. On the basis of the test results have been proven improvements functional properties mineral-rubber-asphalt mixes compared with mineral-asphalt mixes with unmodified asphalt.

  14. Performance evaluation of high modulus asphalt concrete mixes

    Science.gov (United States)

    Haritonovs, V.; Tihonovs, J.; Zaumanis, M.

    2016-04-01

    Dolomite is one of the most available sedimentary rocks in the territory of Latvia. Dolomite quarries contain about 1000 million tons of this material. However, according to Latvian Road Specifications, this dolomite cannot be used for average and high intensity roads because of its low quality (mainly, LA index). Therefore, mostly imported magmatic rocks (granite, diabase, gabbro, basalt) or imported dolomite are used which makes asphalt expensive. However, practical experience shows that even with these high quality materials roads exhibit rutting, fatigue and thermal cracks. The aim of the research is to develop a high performance asphalt concrete for base and binder courses using only locally available aggregates. In order to achieve resistance against deformations at a high ambient temperature, a hard grade binder was used. Workability, fatigue and thermal cracking resistance, as well as sufficient water resistance is achieved by low porosity (3-5%) and higher binder content compared to traditional asphalt mixtures. The design of the asphalt includes a combination of empirical and performance based tests, which in laboratory circumstances allow simulating traffic and environmental loads. High performance AC 16 base asphalt concrete was created using local dolomite aggregate with polymer modified (PMB 10/40-65) and hard grade (B20/30) bitumen. The mixtures were specified based on fundamental properties in accordance to EN 13108-1 standard.

  15. 热再生沥青混合料再生剂与旧沥青混溶状态测试方法--文献综述%Measurement Method of Blending Status Between Virgin and Aged Binder in Recycled Asphalt Mixtures -A Literature Review

    Institute of Scientific and Technical Information of China (English)

    许鹰; 季节; 张克东

    2016-01-01

    当前热再生沥青混合料基于再生剂(新沥青)与旧沥青处于完全混溶状态假定进行设计,近来的研究表明:实际生产过程中,再生剂与旧沥青之间的混溶状态可能达不到完全混溶的程度。这种理论假设与实际不符会导致生产拌合后的热再生沥青混合料路用性能与设计产生较大差异,甚至产生路面早期损害。因此准确了解热再生混合料中再生剂与旧沥青在实际拌合后的混溶状态对验证设计假定的合理与否以及对热再生沥青混合料生产拌合质量的控制有显著的意义。本文对比了了当前再生剂(新沥青)与旧沥青混溶状态的4种常用测试方法———标记结合料法、可识别差异法、分步抽提法和性能间接测试法,分析了4种方法的优劣,并讨论了混溶状态测试方法的发展方向。%Design procedure of hot in-plant recycled asphalt mixture assumes that the residue aged binder in reclaimed asphalt pavement(RAP)is fully blended with virgin binder.However,recent resear-ches show that the interaction between aged binder and virgin binder may not achieve a total blending sta-tus.The difference between design assumption and actual blending status means thatinsufficient asphalt binder is used in mixtures which may cause dry hot mix asphalt(HMA)and premature pavement distres-ses.Therefore,it is significant for evaluating the reasonableness of design assumptions and mixing quality of recycled asphalt mixtures to measure the blending status between aged binder and virgin binder.In this paper,four typical measurement method of blending status,binder-marked method,difference-identified methods,staged extraction method and indirect performance measured method,are compared and summa-rized.The future development in measurement method is also discussed.Finally,this paper conclude that it is significant to propose a method of continuously measuring the diffusion properties of virgin and

  16. 含层间界面的沥青混合料复合小梁弯曲疲劳试验%Flexural Fatigue Test on Beams of Asphalt Mixture Involving Inter-surface

    Institute of Scientific and Technical Information of China (English)

    艾长发; 成猛; 杨涛; 邱延峻

    2011-01-01

    为探讨层间界面条件对沥青路面疲劳寿命的影响,完善路面疲劳模型,采用小梁弯曲疲劳试验方法,测定不同粘层油用量、不同温度、不同加载等试验条件下复合小梁试件的疲劳寿命.研究结果表明:(1)由于层间界面的存在,导致沥青路面结构整体性减弱,疲劳寿命减小;(2)随着粘层油用量的增加,疲劳寿命呈现先增加后减小的变化规律,并且粘层油用量存在一个最佳值,在此最佳用量下,沥青路面的抗疲劳性能明显提高;(3)与低温条件相比,常温条件下沥青路面的疲劳破损更容易发生,并且车辆超载,轴重增大,会显著降低沥青路面的疲劳寿命;(4)确定了疲劳寿命与粘层油用量、温度、加载量之间的相互关系,通过数值回归分析,建立了疲劳寿命与各影响因素之间的相互作用关系式.%The fatigue life of composite beam samples were measured using method of flexural fatigue test in different tack asphalt coat contents, temperatures and loads to study the influence of interlamination contact on the fatigue life of asphalt pavement and perfect the pavement fatigue model. The results show that (1) the integrity and fatigue life of asphalt pavement decreased due to the existence of interlamination contact; (2) the fatigue life first increased, then decreased with the increase of the content of tack asphalt coat, and there was an optimum content of tack asphalt coat for usage, which can put the fatigue resistance in a higher level; (3) the fatigue failure would happen more easily at normal temperature than at low temperature, and the fatigue life would decrease significantly if vehicle is overweight; (4) the relation of fatigue life with content of tack asphalt coat, temperature and load was found out, and the total fatigue equations were set up.

  17. 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.

  18. 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

  19. Performance of the heavy fraction of pyrolysis oil derived from waste printed circuit boards in modifying asphalt.

    Science.gov (United States)

    Yang, Fan; Sun, Shuiyu; Zhong, Sheng; Li, Shenyong; Wang, Yi; Wu, Jiaqi

    2013-09-15

    The focus of this research was the development of efficient and affordable asphalt modifiers. Pyrolysis oil was produced as a byproduct from the pyrolysis of waste printed circuit boards (WPCBs). The high boiling point fraction was separated from the pyrolysis oil through distillation and is referred to as the heavy fraction of pyrolysis oil (HFPO). The HFPO was tested as an asphalt modifier. Three asphalt modifiers were tested: HFPO; styrene-butadiene rubber (SBR); and HFPO + SBR (1:1). The physical properties and road performance of the three modified asphalts were measured and evaluated. The results have shown that when the amount of modifier was less than 10%, the HFPO modified asphalt had the highest softening point of the three. The dynamic stability (DS) and water resistance of the asphalt mixture with the HFPO modified asphalt was 10,161 cycles/mm and 87.2%, respectively. The DS was much larger than for the HFPO + SBR and SBR modified asphalt mixtures. These results indicate that using HFPO as an asphalt modifier has significant benefits not only for road engineering but also for resource recycling. PMID:23644664

  20. 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.

  1. Polyurethane synthesis reactions in asphalts

    Energy Technology Data Exchange (ETDEWEB)

    Bukowski, A.; Gretkiewicz, J.

    1982-04-01

    A series of asphalt-polyurethane composites was prepared by means of polyurethane synthesis in asphalt and carried out in melt. The applied materials were asphalts of differentiated group components content, polyester polyols of chain structure from linear to strongly branched, 2,4-tolylene diisocyanate, 4,4-methylenebis(phenyl isocyanate), and tinorganic catalyst. The asphalt components react with isocyanates to a minimal degree. The influence of the applied substrates, temperature, and polyurethane content in the system on the basic kinetic relations characterizing the process is presented. Polyurethane synthesis in asphalts does not differ in a fundamental way from the obtaining of polyurethanes, especially when their content in the composition is significant, 20 wt% and more.

  2. 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.

  3. Preparation and properties of montmorillonite modified asphalts

    International Nuclear Information System (INIS)

    Modified asphalts were prepared by melt blending with different contents of montmorillonite (MMT) and organomodified montmorillonite (OMMT). The X-ray diffraction (XRD) results show that the MMT modified asphalt may form an intercalated structure, whereas the OMMT modified asphalt may form an exfoliated structure. The addition of MMT and OMMT to asphalt increases both the softening point and viscosity of the modified asphalts at high temperatures. Furthermore, the modified asphalts exhibited higher complex modulus, lower phase angle. As a consequence, the MMT and OMMT modified asphalts displays enhanced viscoelastic properties, which improve its resistance to rutting at high temperatures. Compared with MMT, OMMT showed better effect in improving softening point and rutting resistance of asphalt, which contributes to the formation of exfoliated structure in OMMT modified asphalt. Storage stability tests disclose that the asphalts modified with MMT or OMMT are very stable when montmorillonite content is less than 3 wt%

  4. 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

  5. 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.

  6. Epoxy asphalt concrete paving on the deck of long-span steel bridges

    Institute of Scientific and Technical Information of China (English)

    HUANG Wei; QIAN Zhendong; CHEN Gang; YANG Jun

    2003-01-01

    It is the first systematic research in the world on the composition design of epoxy asphalt concrete as pav- ing material. Material characteristics and service perform- ance of mixture, fatigue resistance characteristics of epoxy asphalt concrete by the fatigue test of complex beam have also been described. This research indicates that epoxy asphalt concrete is a good type of paving material. Research results have been applied successfully in the paving of steel deck of the Second Nanjing Yangtze River Bridge (SNYRB). It provides a new paving type for long-span steel bridges of China and has a bright application prospect.

  7. 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.  ……

  8. 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

  9. 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.

  10. 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.

  11. Modeling of asphalt-rubber rotational viscosity by statistical analysis and neural networks

    OpenAIRE

    Luciano Pivoto Specht; Oleg Khatchatourian; Lélio Antônio Teixeira Brito; Jorge Augusto Pereira Ceratti

    2007-01-01

    It is of a great importance to know binders' viscosity in order to perform handling, mixing, application processes and asphalt mixes compaction in highway surfacing. This paper presents the results of viscosity measurement in asphalt-rubber binders prepared in laboratory. The binders were prepared varying the rubber content, rubber particle size, duration and temperature of mixture, all following a statistical design plan. The statistical analysis and artificial neural networks were used to c...

  12. 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.

  13. 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...

  14. Application of Different Stabilizers in Secondary Cold-recycled Mixtures of Foamed Asphalt%泡沫沥青二次冷再生混合料不同稳定剂的应用

    Institute of Scientific and Technical Information of China (English)

    许光孝; 胡畔; 邵晗

    2015-01-01

    分别采用泡沫沥青与水泥作为稳定剂对泡沫沥青冷再生路面进行二次冷再生试验研究。研究表明,以泡沫沥青作稳定剂进行二次冷再生混合料设计形成的泡沫沥青二次冷再生混合料,其抗拉性能、水稳性能与二次冷再生混合料中细料含量有关;高温稳定性能与铣刨料用量、铣刨料中沥青老化程度以及二次冷再生混合料中细料含量有关。以水泥作稳定剂进行二次冷再生混合料设计,采用7 d 无侧限抗压强度能够很好地确定新添加骨料比例,适量的新添加骨料能明显增大二次冷再生混合料的7 d 无侧限抗压强度。根据室内研究成果,对试验路段进行辅筑,证明两种二次冷再生技术可行,辅筑路段路用性能良好。%Foamed bitumen and cement were respectively used as a stabilizer for foamed asphalt cold recycled roads to study the secondary cold recycling technology.The laboratory research results show that for the secondary cold recycled mixes with foamed bitumen as a stabilizer,their tensile properties and water-stable performance was related to the fines content in the mixes;the high temperature stability of secondary cold recycling mixes is related to the RAP(recycling asphalt pavement)content,the aging degree of asphalt and the fines content.Cement was adopted as a stabilizer in the second regeneration mix design,and the 7 d unconfined compressive strength was made in use to well determine the proportion of newly added aggregate.An appropriate new aggregate can significantly increase the 7 d unconfined compressive strength of mixes.Through the laboratory study and tested road application,the foundation of future development of the secondary cold recycling technology was laid.

  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. Production technologies and analysis of use of rubberised asphalt

    OpenAIRE

    Pevec, Rok

    2013-01-01

    Used tires present a major enviormental problem worldwide since most of them are burned as fuel in the cement industry, but most of them lie illegally in landfills in nature. It is identified and confirmed in practice that the properties of bituminous binder, to which rubber particles, which are the product of recycling waste automobile and truck tires, are added, and consequently also the properties of asphalt mixtures are significantly improved. Research in this area and the ...

  17. Determination of the asphalt content of the asphalt concrete by surface neutron gauge

    International Nuclear Information System (INIS)

    This paper describes the principle, calibration and field detection of determining the asphalt content of asphalt concrete by surface neutron gauge. This method can be utilized to measure the asphalt content for asphalt concrete dams, highways and airport runways to control the engineering quality

  18. Nanomaterials Applied in Asphalt Modification: A Review

    Institute of Scientific and Technical Information of China (English)

    Changqing Fang; Ruien Yu; Shaolong Liu; Yan Li

    2013-01-01

    Nanotechnology has been gradually penetrated into the field of asphalt modification.Seemingly magic effects of nanomaterials have now been brought to improve the performance of asphalt.To demonstrate many of the prospective applications,researchers have conducted a series of positive and effective efforts dealing with the preparation of modified asphalt to demonstrate the mechanism of modification and the resultant improvement in performance.In this review,various nanomaterials used in asphalt modification are initially presented,followed by the methods employed to modify the asphalt with these materials and finally the effects of nanomaterials on the performance of base asphalt are presented and the modification mechanisms are discussed.Based on the current research results,the influence of preparation process parameters on the compatibility of every phase in the modified asphalt and the stability of the modified asphalt system are described.Finally,the development trend of the topic field is projected.

  19. Investigation of the radiation shielding capacity of asphalt and sand for fast neutron sources

    International Nuclear Information System (INIS)

    The internal wall of the cavity of experimental assemblies, involved with high energy fusion neutrons, can be covered by an asphalt-sand layer for radiation protection purposes. The calculations have demonstrated that asphalt has a radiation protection capability superior to that of concrete, on equivalent weight basis. For an experimental cavity using a 10 (12) neutrons/sec neutron generator, the best structure has been found to be a 10% asphalt-90% red sand homogeneous mixture, against neutron + gamma energies, with a protection capability of more than 200% compared to the same thickness of a concrete structure. This work has proved that the local and cheap asphalt and sand can replace the relatively expensive concrete in constructing biological radiation shielding of experimental assemblies on fusion neutronics. 15 refs

  20. Effects of Fiber Finish on the Performance of Asphalt Binders and Mastics

    Directory of Open Access Journals (Sweden)

    Bradley J. Putman

    2011-01-01

    Full Text Available The objective of this study was to determine the effects of finishes applied to polyester fibers on the properties of asphalt binders and mastics. Asphalt binders were mixed with finishes that were extracted from the fibers, and mastics were also made with binder and fibers (with and without finish to isolate the effects of the finish. The results indicated that crude source plays a significant role in how the fiber finish affects the binders and mastics. Additionally different finishes had different effects on binder properties. The major finding of this study is that different polyester fibers, even from the same manufacturer, may not necessarily perform the same in an asphalt mixture. It is important to use fibers that are compatible with the particular asphalt binder that is being used because of the significance of the binder source on the interaction between the finish and the binder.

  1. 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.

  2. Sinopec Launches Shanghai Asphalt Sales Company

    Institute of Scientific and Technical Information of China (English)

    2004-01-01

    @@ Sinopec Shanghai Asphalt Sales Company was launched in Shanghai on September 22, marking Sinopec as the largest asphalt supplier in China integrated in famous brand,production, sales and research, and distribution network.This is another important initiative for Sinopec's asphalt segment, after Sinopec won the bid for construction of F 1 racing course, to grasp the market opportunities, further improve the product quality and the level of after-sales services, and further make its asphalt business larger and stronger.

  3. Laboratory optimization of continuous blend asphalt rubber

    OpenAIRE

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

    2008-01-01

    Asphalt rubber from wet process requires batching blending and reaction time associated to blending rubber and conventional asphalt to produce asphalt rubber. The ideal blending of these materials depends on the combination of very important variables, such as the amount of rubber, reaction time and temperature reaction. This paper intends to optimize the laboratory production of asphalt rubber using the continuous blend process. The rubber from waste tyres was reduced by ambient grinding and...

  4. Asphalt Carriers from Kraljevica Shipyard, Croatia

    OpenAIRE

    Grubišić, R.

    2006-01-01

    This article is based on the materials presented by the experts from Kraljevica Shipyard at the annual meeting of the Croatian shipbuilding designers held in Kraljevica in October 2005. Asphalt tanker Asphalt Seminole and her sister-ships are rather sophisticated vessels having a complex hull structure, cargo space and cargo survey and control equipment. Therefore, firstly the technical data of the already delivered asphalt tanker Asphalt Seminole are given and then, the very interesting d...

  5. 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.

  6. Initiative assessment of asphalt works

    International Nuclear Information System (INIS)

    Several asphalt works are utilizing heat from combustion of used oil for drying and heating of rock material in the production of asphalt. According to new regulations on combustion of waste, used oil is to be regarded as waste and subject to emission requirements according to the combustion regulations. Measurements show that emissions of CO, dust, dioxins, TOC and SO2 exceed the limits set by the regulations. To conform to the regulations these asphalt works must improve their combustion technique. However, such measures may lead to increased formation of NOx. It is recommended that a combustion chamber for drying of rock material should be used in order to reduce the emissions of CO and TOC concentrations. The concentration of SO2 may be reduced by dry cleaning by means of injection of lime. In the same way, active carbon is injected to remove dioxins. The asphalt works must be outfitted with measuring equipment that monitors and records certain operation and control parameters and some emission to air parameters. Periodic measurements are to be done of heavy metals and dioxins. It is estimated that the measures necessary to make the asphalt works comply with the regulations will cost about NOK 4 530 000 in investment per plant and that the operation expenses will increase by NOK 700 000 per year per plant. This includes maintenance, control etc

  7. Investigation of Coarse Aggregate Strength for Use in Stone Matrix Asphalt

    OpenAIRE

    Celaya, Brandon J.; Haddock, John E.

    2006-01-01

    Stone Matrix Asphalt is a gap-graded hot-mix asphalt mixture composed of a coarse aggregate skeleton and a binder-rich mortar. The mixture type was first introduced to the United States in 1991, with one of the first test sections placed on I-70 near Richmond, Indiana. To help control the selection of coarse aggregate, the Indiana Department of Transportation specified a maximum Los Angeles Abrasion loss value of 30 percent. An investigation into the coarse aggregate specifications for use in...

  8. Modelling and Laboratory Studies on the Adhesion Fatigue Performance for Thin-Film Asphalt and Aggregate System

    Directory of Open Access Journals (Sweden)

    Dongsheng Wang

    2014-01-01

    Full Text Available Adhesion between asphalt and aggregate plays an important role in the performance of asphalt mixtures. A low-frequency adhesion fatigue test was proposed in this paper to study the effect of environment on the asphalt-aggregate adhesion system. The stress-based fatigue model had been utilized to describe the fatigue behavior of thin-film asphalt and aggregate system. The factors influencing the adhesion fatigue performance were also investigated. Experiment results show that asphalt has more important effect on the adhesion performance comparing with aggregate. Basalt, which is regarded as hydrophobic aggregates with low silica content, has better adhesion performance to asphalt binder when compared with granite. The effects of aging on the adhesion fatigue performance are different for PG64-22 and rubber asphalt. Long-term aging is found to reduce the adhesion fatigue lives for rubber asphalt and aggregate system, while the effect of long-term aging for aggregate and PG64-22 binder system is positive. Generally the increased stress amplitude and test temperature could induce greater damage and lead to less fatigue lives for adhesion test system.

  9. Modelling and laboratory studies on the adhesion fatigue performance for thin-film asphalt and aggregate system.

    Science.gov (United States)

    Wang, Dongsheng; Yi, Junyan; Feng, Decheng

    2014-01-01

    Adhesion between asphalt and aggregate plays an important role in the performance of asphalt mixtures. A low-frequency adhesion fatigue test was proposed in this paper to study the effect of environment on the asphalt-aggregate adhesion system. The stress-based fatigue model had been utilized to describe the fatigue behavior of thin-film asphalt and aggregate system. The factors influencing the adhesion fatigue performance were also investigated. Experiment results show that asphalt has more important effect on the adhesion performance comparing with aggregate. Basalt, which is regarded as hydrophobic aggregates with low silica content, has better adhesion performance to asphalt binder when compared with granite. The effects of aging on the adhesion fatigue performance are different for PG64-22 and rubber asphalt. Long-term aging is found to reduce the adhesion fatigue lives for rubber asphalt and aggregate system, while the effect of long-term aging for aggregate and PG64-22 binder system is positive. Generally the increased stress amplitude and test temperature could induce greater damage and lead to less fatigue lives for adhesion test system. PMID:25054187

  10. 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...

  11. Waterproofing improvement of radioactive waste asphalt solid

    International Nuclear Information System (INIS)

    Purpose: To improve the waterproofing of asphalt solid by adding an alkaline earth metal salt and, further, paraffin, into radioactive liquid waste when processing asphalt solidification of the radioactive liquid waste. Method: Before processing molten asphalt solidification of radioactive liquid waste, soluble salts of alkaline earth metal such as calcium chloride, magnesium chloride, or the like is added to the radioactive liquid waste. Paraffin having a melting point of higher than 600C, for example, is added to the asphalt, and waterproofing can be remarkably improved. The waste asphalt solid thus fabricated can prevent the swelling thereof, and can improve its waterproofing. (Yoshihara, H.)

  12. Deformation Properties and Fatigue of Bituminous Mixtures

    OpenAIRE

    Frantisek Schlosser; Jan Mikolaj; Viera Zatkalikova; Juraj Sramek; Dominika Durekova; Lubos Remek

    2013-01-01

    Deformation properties and fatigue performance are important characteristics of asphalt bound materials which are used for construction of pavement layers. Viscoelastic asphalt mixtures are better characterized via dynamic tests. This type of tests allows us to collate materials with regard to axle vibrations which lie usually in the range of 6 Hz–25 Hz for standard conditions. Asphalt modified for heat sensitivity in the range from −20°C to +60°C has significant impact on the overall charact...

  13. Evaluation of Colemanite Waste as Aggregate Hot Mix Asphalt Concrete

    Directory of Open Access Journals (Sweden)

    Nihat MOROVA

    2015-09-01

    Full Text Available In this study usability of waste colemanite which is obtained after cutting block colemanite for giving proper shape to blocks as an aggregate in hot mix asphalt. For this aim asphalt concrete samples were prepared with four different aggregate groups and optimum bitumen content was determined. First of all only limestone was used as an aggregate. After that, only colemanite aggregate was used with same aggregate gradation. Then, the next step of the study, Marshall samples were produced by changing coarse and fine aggregate gradation as limestone and colemanite and Marshall test were conducted. When evaluated the results samples which produced with only limestone aggregate gave the maximum Marshall Stability value. When handled other mixture groups (Only colemanite, colemanite as coarse aggregate-limestone as fine aggregate, colemanite as fine aggregate-limestone as coarse aggregate all groups were verified specification limits. As a result, especially in areas where there is widespread colemanite waste, if transportation costs did not exceed the cost of limestone, colemanite stone waste could be used instead of limestone in asphalt concrete mixtures as fine aggregate

  14. The Effect of Morphological Characteristic of Coarse Aggregates Measured with Fractal Dimension on Asphalt Mixture’s High-Temperature Performance

    Directory of Open Access Journals (Sweden)

    Hainian Wang

    2016-01-01

    Full Text Available The morphological properties of coarse aggregates, such as shape, angularity, and surface texture, have a great influence on the mechanical performance of asphalt mixtures. This study aims to investigate the effect of coarse aggregate morphological properties on the high-temperature performance of asphalt mixtures. A modified Los Angeles (LA abrasion test was employed to produce aggregates with various morphological properties by applying abrasion cycles of 0, 200, 400, 600, 800, 1000, and 1200 on crushed angular aggregates. Based on a laboratory-developed Morphology Analysis System for Coarse Aggregates (MASCA, the morphological properties of the coarse aggregate particles were quantified using the index of fractal dimension. The high-temperature performances of the dense-graded asphalt mixture (AC-16, gap-graded stone asphalt mixture (SAC-16, and stone mastic asphalt (SMA-16 mixtures containing aggregates with different fractal dimensions were evaluated through the dynamic stability (DS test and the penetration shear test in laboratory. Good linear correlations between the fractal dimension and high-temperature indexes were obtained for all three types of mixtures. Moreover, the results also indicated that higher coarse aggregate angularity leads to stronger high-temperature shear resistance of asphalt mixtures.

  15. 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

    2016-03-01

    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. For the rheological characterization, three-point bending creep tests are performed on beams of different sizes. The beams are also analyzed using digital image analysis to obtain volumetric fraction, average size distribution, and spatial correlation functions. Based on the experimental results and analyses, it is concluded that representative creep stiffness values of asphalt mixtures can be obtained from testing at least three replicates of the thin (BBR) mixture beams. Failure properties are investigated by performing strength tests using a modified Bending Beam Rheometer (BBR), capable of applying loads at different loading rates. Histogram testing of BBR mixture beams and of larger beams is performed and the failure distribution is analyzed based on the size effect theory for quasibrittle materials. Different Weibull moduli are obtained from the two specimens sizes, which indicates that BBR beams do not capture the representative volume element (RVE) of the material.

  16. First Observation of the Blending Zone Morphology at the Interface of Reclaimed Asphalt Binder and Virgin Bitumen

    OpenAIRE

    Nahar, S.N.; Mohajeri, M.; Schmets, A. J. M.; Scarpas, T.; Van de Ven, M.F.C.; Schitter, G.

    2013-01-01

    One of the challenges in designing recycled asphalt mixtures with a high amount of RAP is to estimate the blending degree between RAP binder and the added virgin bitumen. The extent of blending is crucial in this case as asphalt concrete response is influenced by the final binder properties. This paper focuses on the evaluation of interaction and extent of blending between RAP-binder and virgin bitumen by studying the microstructures of the ‘blending zone’ with atomic force microscopy (AFM). ...

  17. A study on engineering characteristics of asphalt concrete using filler with recycled waste lime.

    Science.gov (United States)

    Sung Do, Hwang; Hee Mun, Park; Suk keun, Rhee

    2008-01-01

    This study focuses on determining the engineering characteristics of asphalt concrete using mineral fillers with recycled waste lime, which is a by-product of the production of soda ash (Na(2)CO(3)). The materials tested in this study were made using a 25%, 50%, 75%, and 100% mixing ratio based on the conventional mineral filler ratio to analyze the possibility of using recycled waste lime. The asphalt concretes, made of recycled waste lime, hydrated lime, and conventional asphalt concrete, were evaluated through their fundamental engineering properties such as Marshall stability, indirect tensile strength, resilient modulus, permanent deformation characteristics, moisture susceptibility, and fatigue resistance. The results indicate that the application of recycled waste lime as mineral filler improves the permanent deformation characteristics, stiffness and fatigue endurance of asphalt concrete at the wide range of temperatures. It was also determined that the mixtures with recycled waste lime showed higher resistance against stripping than conventional asphalt concrete. It was concluded from various test results that a waste lime can be used as mineral filler and, especially, can greatly improve the resistance of asphalt concrete to permanent deformation at high temperatures. PMID:17408942

  18. 盐化物融冰雪沥青路面盐分溶析试验研究%Experiment Research of Asphalt Mixture with Salt for Melting Snow and Ice

    Institute of Scientific and Technical Information of China (English)

    李娜; 王海峰; 徐希娟

    2014-01-01

    路面的抗滑性能是保证车辆安全行驶的关键因素,盐化物融冰雪沥青路面的冻结抑制作用主要取决于路面内冻结抑制成分的含量及路面表面的盐分析出量。通过自然浸泡溶出量法研究盐分随时间的溶析规律,结果表明:盐化物的溶析分为三个阶段,初期溶析速度较快,第二阶段为匀速溶出阶段,后期溶液浓度趋于稳定,通过溶液浓度可间接评价融冰雪效果。%Anti-slip Performance of pavement is the key factor to ensure the safe driving of vehicles, anti-freezing effect of salt anti-freezing asphalt pavement depends on the content of anti-freezing element in pavement and surface salt output. Through the natural immersion dissolved amount method to study the solventing-outlaw of salt with time, the results show that:dissolving salt can be divided into three stages, the initial dilution rate is fast, the second stage stripping stage is uniform, the late solution concentration tends to be stable, melting ice and snow effect is evaluated indirectly by the concentration of the solution.

  19. Development of criteria for the use of asphalt-rubber as a Stress-Absorbing Membrane Interlayer (SAMI)

    Science.gov (United States)

    Newcomb, D. E.; McKeen, R. G.

    1983-12-01

    This report documents over 2 years of research efforts to characterize asphalt-rubber mixtures to be used in Stress-Absorbing Membrane Interlayers (SAMI). The purpose of these SAMIs is to retard or prevent reflection cracking in asphalt-concrete overlays. Several laboratory experiments and one field trial were conducted to define significant test methods and parameters for incorporation into construction design and specification documents. Test methods used in this study included a modified softening point test, force-ductility, and Schweyer viscosity. Variables investigated included (1) Laboratory-mixing temperature; (2) Rubber type; (3) Laboratory storage time; (4) Laboratory storage condition; (5) Laboratory batch replication; (6) Laboratory mixing time; (7) Field mixing time; (8) Laboratory test temperature; (9) Force-Ductility elongation rates; and (10) Asphalt grade. It was found that mixing temperature, mixing time, rubber type, and asphalt grade all have significant effects upon the behavior of asphalt-rubber mixtures. Significant variability was also noticed in different laboratory batch replications. Varying laboratory test temperature and force-ductility elongation rate revealed further differences in asphalt-rubber mixtures.

  20. STATE OF TRANSPORT PROCESSES FOR REPAIRING AND ASPHALTING OF ASPHALT ROADS AND WAYS THEIR DEVELOPMENT

    Directory of Open Access Journals (Sweden)

    Nikolaev N. N.

    2015-04-01

    Full Text Available The article explains the importance of the transport process when performing repair jobs of asphalt roads. The scheme of the technological process was drawn up; job steps were identified, while the latter may be characterized by non-productive downtime of transport as well as that one of technological machines. We have analyzed the following steps of the flowchart of the road concrete mix transportation: the preparation of the road concrete mix for transportation, loading, transportation, unloading, laying and packing. The transportation of goods starts at the working site of their production and ends at the site of their consumption. The transportation process is a multistep and multioperational process having the greater diversity of technological, operational and economic operations, which must be correctly organized. It is extremely important to deliver the road concrete mix of coating plant (OP just in time, while avoiding the unproductive idle standing of the equipment, the deterioration of the mixture, as well as performing the job steps at minimum transportation cost savings. The successful combining of the steps of the concept organization of the road concrete mix transportation (coating plant, asphalt laying step, transportation step will improve the performance and will provide the reduction of the job cost. One must perform the coordination of job steps on different road sections using information technologies and communication facility

  1. Scrap tire rubber as modifier of asphalt cement for use in road paving Borracha de pneus como modificador de cimentos asfálticos para uso em obras de pavimentação

    OpenAIRE

    Sandra Oda; Jose Leomar Fernandes Junior

    2001-01-01

    This work presents the results of a research on the technical feasibility of the use of asphalt-rubber binder by the asphalt paving industry. In Brazil more than 30 million tires a year are disposed of, mostly in inadequate sites, causing serious health and environmental problems. The effects of the main factors (rubber content, rubber particle size, temperature of mixture, reaction time) on the behavior of asphalt-rubber binders are evaluated by traditional and Superpave Method tests, the la...

  2. Rheological characteristics of aged asphalt binder

    Institute of Scientific and Technical Information of China (English)

    刘聪慧; 吴少鹏; 刘全涛; 朱国军

    2008-01-01

    Different aging levels(RTFOT,PAV-10h,PAV-20h and PAV-30 h) of asphalt binders with various mass ratios of mineral powder to asphalt(0,0.4,0.8,1.2,1.6,2.0) were used to investigate the rheological properties of aged asphalt binders with respect to their short and long terms aging characteristics.Viscosity test,dynamic shear test and creep test were conducted.The test results indicate that the viscosity of aged asphalt binder increases sharply with the extension of aging period.Complex shear modulus of aged asphalt increases,which indicates that the stiffness of asphalt binders can increase.The phase angle for aged asphalt binders reduces,which indicates that the elastic portion for viscoelastic property of asphalt binders increases.|G*|·sin δ increases after aging procedure which means that the fatigue resistance becomes poor.The creep test results show that creep strain curves varies remarkably for virgin and aged asphalt binders.The total strain during loading period and the permanent strain decreases significantly for aged asphalt binders,which implies that the elastic portion increases and the viscous portion decreases.

  3. Enhancing Asphalt Binder's Rheological Behavior and Aging Susceptibility Using Nano-Particles

    Science.gov (United States)

    Walters, Renaldo C.

    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 that nano-particles and bio modification have on the aging susceptibility of asphalt binder. As such, the following hypothesis was investigated: Introduction of nano particles to asphalt binder will reduce asphalt oxidation aging by increasing the inter layer spacing of the nano particles. Two nano scale materials were used for this study, nano-clay and bio-char as well as one micro scale material, silica fume. 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 reduce the rate of asphalt oxidation. Silica Fume is an ultra-fine powder collected as a by-product of silicon and ferrosilicon alloy production and consists of spherical particles. In this study several mixtures are designed and evaluated using RV testing (Rotational Viscometer), X-ray Diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FTIR). Nano-clay is blended at 2% and 4% by weight of dry mass, 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 of dry mass. Silica Fume is added to virgin asphalt binder (PG 64-22) at 2%, 4% and 8% by weight of dry mass. The optimum percent of nano scale material that is added to virgin asphalt binder is expected to reduce aging susceptibility of asphalt binder, extending its service life.

  4. 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.

  5. 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,

  6. Thermoplastic rubber comprising ethylene-vinyl acetate copolymer, asphalt and fluxing oil

    Science.gov (United States)

    Hendel, F. J. (Inventor)

    1970-01-01

    A thermoplastic rubber is made from a mixture of between about 10 percent and about 50 percent of asphalt, between about 5 percent and about 30 percent fluxing oil, and between about 35 percent and about 70 percent of a copolymer of polyethylene and vinyl acetate.

  7. 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.

  8. Development of asphaltic mix with waste products use

    Directory of Open Access Journals (Sweden)

    Pugin Konstantin Georgievich

    2014-07-01

    Full Text Available The trend of high growth of the vehicle fleet in Russia along with the positive impact on the socio-economic development of the country has a number of adverse consequences, one of which is the high accident rate on the roads. The paper considers modern way to provide the safe vehicles flow with the use of colored asphalt, which is a kind of hot asphalt and can have a variety of colors, which consists of coloring pigments. The conventional method of coloring the asphalt mix is produced by adding color rubble or pigmenting additives. The task, which was put forward, was the establishment of such road concrete mix, from which, without the use of primary materials and without increasing the consumption of bitumen, asphalt concrete road surfaces of acceptable strength could be obtained. As a pigment the dust of gas purification system of electrical furnace DSP - 60 of «Kamastal» plant, Perm, was used. The composition of the dust waste from the furnace consists of metal oxides and silicates. Dust-gas-cleaning is a fine powder with a high specific surface (1.2…2.5 thousand cm /g and bulk density of 3.7…4.2 g/cm . The powder color is dark brown. The density of the ready colored asphalt samples is 2.47...2.49 g/cm , and water saturation is 3.50…3.55 %. As a result of the research the diagrams of the dependence of road concrete mix’s water saturation from dust percentage and a diagram of dependence of concrete mixes’ durability from dust percentage at t = 20° and 50° C were built. After analyzing the obtained curves it can be concluded that the increase of the percentage of dust leads to increase of water saturation of road concrete mix and reduced strength. Thus, the developed asphalt concrete mix allows visually separating the lanes on the road, it has the relevant regulatory requirements durability and water resistance. This mixture corresponds to the type B mark III and can be used in regions I, II, and partly III of road-climatic zones

  9. 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...

  10. Construction and maintenace of porous asphalt

    OpenAIRE

    Kert, Gregor

    2012-01-01

    In improving traffic safety and reducing traffic noise road building experts from Slovenia and the world are faced with permeable surfaces - namely porous asphalt. There is hardly any water retention on road surfaces with the use of porous asphalt, what Slovenian engineers efficiently use on motorways where transverse profile changes its direction. Lately, porous asphalt is also being used for traffic noise reduction. However, porous road surface has some important disadvantages due to its...

  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. Energy and exergy analysis in an asphalt plant's rotary dryer

    International Nuclear Information System (INIS)

    In this paper, energy and exergy analyses of a rotary dryer employed in a Hot Mix Asphalt (HMA) plant for heating and drying of the aggregates in the mixture is presented. In the analysis, the exergy method in addition to the more conventional energy analysis, is employed to identify and evaluate the thermodynamic losses. The results show that, at design conditions, the plant performs with energy and exergy efficiencies of 0.89 and 0.18, respectively. The energy losses are mainly due to the flue gases. The exergy distribution indicates that the combustion and the heat transfer at different temperatures in the burner yield the highest exergy destruction in the process. A parametric study is conducted for the plant under various operational production parameters, including different humidities of the aggregates and filler content in aggregates, working temperatures and ambient conditions, in order to determine the parameters that affect the plant performance. It is shown that the solids humidity has a great impact on energy requirements. A better and sustainable use of the heat source employed in the dryer is proposed to avoid the high irreversibilities found. Furthermore, operating corrections in the mix or in the exhaust gas temperature are proposed to optimize the performance of the plant. - Research highlights: → Identify main energy losses and irreversibilities in the dryer of an asphalt plant. → Optimize operating conditions in an Asphalt plant. → Improve energy savings and availability of the drying and heating process. → Encourage the use of a cogeneration system.

  13. Use of steel slag aggregate in asphalt concrete mixes

    Energy Technology Data Exchange (ETDEWEB)

    Asi, I.M.; Qasrawi, Y.; Shalabi, F.I. [Hashemite Univ., Zarqa (Jordan). Dept. of Civil Engineering

    2007-08-15

    The physical, chemical and mechanical properties of generated steel slag aggregates (SSA) were studied in order to investigate their potential use in asphalt concrete (AC) mixes. Five AC mixes were investigated, notably an AC mix with a 100 per cent limestone aggregate, and mixes comprised of 25, 50, 75, and 100 per cent SSA coarse aggregates. A superpave mix design was used to determine optimum asphalt content (OAC). Steps included the selection of a design aggregate structure, optimization of the asphalt content for the structure, and an evaluation of the moisture sensitivity of the design mixture. The effectiveness of the samples were assessed by their ability to improve indirect tensile strength (ITS); resilient and creep modulus; fatigue life; and stripping and rutting resistance. Various AC mixes containing the SSA were then evaluated. A gyratory compactor was used to compact the test samples, which were then subjected to comprehensive mechanical evaluations. Statistical analyses were then performed to examine the significance of the SSA percentage in the changing ITS values using analysis of variance (ANOVA) calculations. Results of the study indicated that SSA met both superpave consensus properties and Jordanian standards source properties. Chemical and toxic levels were within allowable limits. It was concluded that optimal the replacement percentage of SSA was 25 per cent. 18 refs., 9 tabs., 21 figs.

  14. The use of asphalt in hydraulic engineering

    OpenAIRE

    Van de Velde, P.A.; Ebbens, E.H.; Van Herpen, J.A.

    1985-01-01

    Asphalt products have been used in the Netherlands in hydraulic engineering for a long time on a large scale, especially after the great disaster in 1953 when a large part of western Holland was flooded by the sea. After the disaster a great number of dikes had to be repaired very quickly and this was possible with the use of asphalt as a revetment material. Asphalt could be placed much faster then the materials most commonly used in those days. Further more asphalt is, when desired, more wat...

  15. 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.

  16. 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...

  17. Rheological characterization of aged asphalts

    International Nuclear Information System (INIS)

    The present work shows the rheological properties of the three Colombian asphalts produced in the refineries at Barrancabermeja, Cartagena and Apiay, exposed to the open air during 18 months using a specially designed testing bank. rheological behavior was evaluated using the new specifications of SHRP technology in the Brookfield and DSR rheometers to determine viscosity, shear stress, shear rate, dynamic share modulus and other related variables. The measurements were made using different temperatures and load times

  18. 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...

  19. Rutting analysis of 100 mm diameter polypropylene modified asphalt specimens using gyratory and Marshall compactors

    OpenAIRE

    Serkan Tapkın; Mustafa Keskin

    2013-01-01

    Compaction technique used in Marshall design does not model the process of actual rolling procedures on site exactly. Carrying out laboratory compaction of dense bituminous mixtures with Superpave gyratory compactors is a more realistic way of simulating actual compaction. In this study, mechanical differences of reference and polypropylene modified asphalt mixtures were compared using Superpave gyratory and Marshall compaction methods by carrying out repeated creep tests utilising universal ...

  20. Asphalt solidification of mixed wastes

    International Nuclear Information System (INIS)

    Mixed wastes pose a problem to generators since there are no burial sites or treatment facilities currently accepting this waste type. One potential disposal method is treating the waste to render it non-hazardous, and disposing of it in accordance with radioactive waste requirements. A possible means of accomplishing this transformation is solidifying the waste in asphalt (bitumen). Associated Technologies Incorporated, in cooperation with Oak Ridge National Laboratory, solidified in asphalt a surrogate sodium nitrate-based waste, spiked with EPtoxic metals and non-radioactive cesium and strontium. This paper reports the characteristics of the spiked ORNL solution that was solidified as well as the properties of the solidified end product. The waste samples generated underwent EP toxicity testing as well as ANS 16.1 leach testing for 90 days and the results of those tests are presented. Also, a discussion of the criteria for classifying a waste as hazardous are included in order to demonstrate that the waste, once solidified in asphalt, may no longer be considered hazardous

  1. Performance study of rubber asphalt%橡胶沥青相关性能的试验研究

    Institute of Scientific and Technical Information of China (English)

    郑建伟; 何晓鸣

    2014-01-01

    通过室内试验分析研究了不同橡胶粉掺量对基质沥青的改性效果,分析了橡胶沥青的高温性能,水稳定性,耐久性性能指标。结果表明:在试验范围内,轮胎橡胶粉能显著提高沥青混合料的高温性能,轮胎橡胶粉掺量越高,混合料的高温性能越好;橡胶沥青混合料的残留稳定度要比基质沥青混合料有所提高,体现了橡胶沥青较好的抵抗水损害的能力;橡胶粉改性沥青的耐老化性能也有了一定的提高。%The effect of crumb rubber with different contents on the performance of asphalt rubber was studied through a series of tests .The high temperature performance , water stability , durability performance of rubber as-phalt were analyzed .The results show that rubber powder can remarkably improve the high temperature performance of asphalt mixture .The higher tire rubber powder content , the better the performance of the high temperature of mixture.The residual stability of rubber asphalt mixture was better than the matrix asphalt mixture 's, which embod-ies the rubber asphalt has good resistance for water damage .Rubber powder modified asphalt aging resistance per-formance was improved .

  2. 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。

  3. 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.

  4. Research on the Microstructure and Property of an Anion Rubber Modified Asphalt

    Directory of Open Access Journals (Sweden)

    Wei Hong

    2013-01-01

    Full Text Available The anion rubber modified asphalt (ARMA mixture was first successfully developed with a unique process. In the development process, rubber and asphalt were mixed in the same proportion. Furthermore, the microstructure and modification mechanism of the material were characterized by SEM, FT-IR, TG, and XRD tests. The mechanical property of the mixture was also tested in accordance with the relevant standards. In the end, the material’s capacity of releasing anion was measured by DLY-6A232 atmospheric ion gauge. The results indicated that the addition of anion additive into the rubber modified asphalt (RMA was a mere physical mixture, and the anion additives and rubber particles uniformly dispersed in the ARMA. The addition of anion additive could improve the thermal stability of the RMA. Compared with the traditional asphalt pavement material, the ARMA material shows excellent mechanical properties as well as the ability of releasing anion. Moreover, the material has enormous economic and social benefits by taking full advantage of a large amount of waste tires, thus improving the road surrounding environment.

  5. Asphalts tests using onshore drilling oil wells residues; Ensaios asfalticos utilizando residuos de perfuracao onshore

    Energy Technology Data Exchange (ETDEWEB)

    Lucena, Adriano Elisio de F.L.; Rodrigues, John Kennedy G.; Ferreira, Heber Carlos; Lucena, Leda Christiane de F.L. [Universidade Federal de Campina Grande (UFCG), PB (Brazil); Lucena, Luciana de F.L. [Faculdade de Ciencias Sociais Aplicada (FACISA), Campina Grande, PB (Brazil)

    2008-07-01

    The drilling cuttings are one of the residues produced by the oils industries in large amounts during the drilling of oil wells. An alternative of final disposal of the drilling cutting residue is its utilization in asphalt mixtures. Based on this alternative, it was realized chemical and granulometric analysis and tests (Marshall and indirect tensile strength), on the asphaltic mixture using the residue from the oil drilling wells (well: 1-POTI-4-RN, located at Governador DIX-Sept Rosado - RN - Brazil). The achieved results to Marshall test indicated that for the analyzed mixture, the ideal content of residue that can be incorporated to the asphaltic composition and attend at the DNIT-ES 31 (2006) is 5%. To the indirect tensile strength test, the results showed a strength value higher than the minimum limit requested by the DNIT (0,65 MPa). The achieved results indicated the possibility of the utilization of the drilling cuttings in asphaltic pavements as fine aggregate, obeying the percentage limits, as an alternative to the final disposal. (author)

  6. 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.

  7. Effect of Crumb Rubber and Warm Mix Additives on Asphalt Aging, Rheological, and Failure Properties

    Science.gov (United States)

    Agrawal, Prashant

    Asphalt-rubber mixtures have been shown to have useful properties with respect to distresses observed in asphalt concrete pavements. The most notable change in properties is a large increase in viscosity and improved low-temperature cracking resistance. Warm mix additives can lower production and compaction temperatures. Lower temperatures reduce harmful emissions and lower energy consumption, and thus provide environmental benefits and cut costs. In this study, the effects of crumb rubber modification on various asphalts such as California Valley, Boscan, Alaska North Slope, Laguna and Cold Lake were also studied. The materials used for warm mix modification were obtained from various commercial sources. The RAF binder was produced by Imperial Oil in their Nanticoke, Ontario, refinery on Lake Erie. A second commercial PG 52-34 (hereafter denoted as NER) was obtained/sampled during the construction of a northern Ontario MTO contract. Some regular tests such as Dynamic Shear Rheometer (DSR) and Bending Beam Rheometer (BBR), Multiple Stress Creep Recovery (MSCR) and some modified new protocols such as the extended BBR test (LS-308) and the Double-Edge Notched Tension (DENT) test (LS-299) are used to study, the effect of warm mix and a host of other additives on rheological, aging and failure properties. A comparison in the properties of RAF and NER asphalts has also been made as RAF is good quality asphalt and NER is bad quality asphalt. From the studies the effect of additives on chemical and physical hardening tendencies was found to be significant. The asphalt samples tested in this study showed a range of tendencies for chemical and physical hardening.

  8. Solidification of aqueous tritium-containing wastes with calcium oxide and asphalt

    International Nuclear Information System (INIS)

    A simple method is proposed for solidifying aqueous tritium-containing wastes with calcium oxide and asphalt. We incorporated tritiated calcium hydroxide into molten asphalt at 100-210/degree/C and studied the evolution of tritium (T) oxides there from as well as the extent to which calcium and tritium are leached out of the solidified product. Depending on temperature and heating time, the evolution of HTO from a Ca(OH)OT-asphalt mixture was low (between 5.6 x 10/sup /minus/4/ and 5.9 x 10/sup /minus/4/ wt.% of the original amount). Tritium evolution rates and leaching coefficients of tritium and calcium showed the solidified product to have high stability in water. Conclusions were drawn as to the usefulness of the proposed method

  9. EVALUATION OF EMISSIONS FROM PAVING ASPHALTS

    Science.gov (United States)

    The report provides data from pilot-scale measurements of the emissions of specific air pollutants from paving asphalt both with and without recycled crumb rubber additives. The methods used in this work measured emissions from a static layer of asphalt maintained for several hou...

  10. EVALUATION OF EMISSION FROM PAVING ASPHALTS

    Science.gov (United States)

    The report provides data from pilot-scale measurements of the emissions of specific air pollutants from paving asphalt both with and without recycled crumb rubber additives. he methods used in this work measured emissions from a static layer of asphalt maintained for several hour...

  11. Asphalt Raking. Instructor Manual. Trainee Manual.

    Science.gov (United States)

    Laborers-AGC Education and Training Fund, Pomfret Center, CT.

    This packet consists of the instructor and trainee manuals for an asphalt raking course. The instructor manual contains a course schedule for 4 days of instruction, content outline, and instructor outline. The trainee manual is divided into five sections: safety, asphalt basics, placing methods, repair and patching, and clean-up and maintenance.…

  12. 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.

  13. Environmental Benefits of Warm Mix Asphalt (WMA)

    OpenAIRE

    Zaumanis, M; Olesen, E

    2010-01-01

    Warm Mix Asphalt technology promises various benefits, but probably the most significant is the possibility to reduce carbon footprint of asphalt. The degree of emission reduction depends on the production technology, therefore life cycle assessment tool is vital to calculate the benefits and compare technologies.

  14. 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.

  15. 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

  16. 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.

  17. Triterpane distributions in diapir-related asphalts

    Energy Technology Data Exchange (ETDEWEB)

    Dorronsoro, C.; Garcia, M.R.; Grimalt, J.O. (University of the Basque Country, Donostia (Spain). College of Chemistry)

    1994-01-01

    A gas chromatographic-mass spectrometric study of solvent-soluble extracts from asphalt-rich sediments in a diapir-intruded crude oil reservoir rock has demonstrated the extended biodegradation of the hydrocarbons in the strata in contact with the diapir. The process has led to a sedimentary hydrocarbon composition dominated by unresolved complex mixtures of aliphatic and aromatic hydrocarbons in which two main groups of resolved peaks in the gas chromatograms can be recognized. The dominant group encompasses the compounds preserved in these conditions and is composed of two distributions of hexacyclic hopanoids, a series of C[sub 32]-C[sub 35] 20,32-cyclobishomohopanes and a new series of C[sub 33]-C[sub 35] homologues whose structure is not yet fully elucidated. The second group corresponds to partly transformed aliphatic and aromatic structures, namely series of C[sub 27]-C[sub 30]8,14-seco-hopanes and C[sub 27]-C[sub 31]D-ring aromatic 8,14-seco-hopanes. 26 refs., 8 figs., 2 tabs.

  18. 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

  19. Disaster forming reasons on fire explosion at an asphalt solidification processing facility

    International Nuclear Information System (INIS)

    Disaster forming reasons on fire explosion accident at an asphalt solidification processing facility of the Power Reactor and Nuclear Fuel Development Corporation formed on 1997 was elucidated. Mixture of salts composing of nitrates, nitrites, and so on with asphalt was filled into a drum at about 180 centigrade, and generated disaster during its natural cooling after about 20 hours. Its reason consisted in change of production condition to make liquid wastes of batches 29 and 30 producing the mixture to contain about 7.7 g/L of salts and liquid wastes supplying rate to reduce to about 160 mL/h. The liquid wastes were mixed with asphalt heated to temperature of about 250 centigrade, when it contained a lot of NaHCO3 into the salts particles on filling the mixture because moisture was evaporated more rapidly under pressure of phosphates based on the change of production condition. NaHCO3 directly decomposed to make the salts particles porous and to form a weak redox reaction based on boundary reaction appearing at temperature range from 160 to 200 centigrades. By this reaction, the mixture filled into drum generated thermal accumulation to fire the mixture. (G.K.)

  20. 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.

  1. 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 ...

  2. 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...

  3. 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...

  4. 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...

  5. Investigation of statistical relationship between dynamic modulus and thermal strength of asphalt concrete

    International Nuclear Information System (INIS)

    Dynamic modulus is a performance indicator for asphalt concrete and is used to qualify asphalt mixtures based on stress-strain characteristics under repeated loading. Moreover, the low temperature cracking of asphalt concrete mixes are measured in terms of fracture strength and fracture temperature. Dynamic modulus test was selected as one of the simple performance tests in the AASHTO 2002 guidelines to rate mixtures according to permanent deformation performance. However, AASHTO 2002 guidelines is silent in relating dynamic modulus values to low temperature cracking, probably because of weak correlations reported between these two properties. The present study investigates the relation between these two properties under the influence of aggregate type and mix gradation. Mixtures were prepared with two types of aggregate and gradations, while maintaining the binder type and air voids constant. The mixtures were later tested for dynamic modulus and fracture strength using thermal stress restrained specimen test (TSRST). Results indicate that there exists a fair correlation between the thermal fracture strength and stiffness at a selected test temperature and frequency level. These correlations are highly dependent upon the type of aggregate and mix gradation. (author)

  6. Method of reprocessing radioactive asphalt solidification products

    International Nuclear Information System (INIS)

    Purpose: To obtain heat-stable solidification products and decrease the total volume thereof by modifying the solidified form by the reprocessing of existent radioactive asphalt solidification products. Method: Radioactive asphalt solidification products are heated into a fluidized state. Then, incombustible solvents such as perchloroethylene or trichloroethylene are added to a dissolving tank to gradually dissolve the radioactive asphalt solidification products. Thus, organic materials such as asphalts are transferred into the solvent layer, while inorganic materials containing radioactive materials remain as they are in the separation tank. Then, the inorganic materials containing the radioactive materials are taken out and then solidified, for example, by converting them into a rock or glass form. (Kawakami, Y.)

  7. 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.

  8. 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...

  9. Performance Characteristics of Silane Silica Modified Asphalt

    OpenAIRE

    Xuedong Guo; Mingzhi Sun; Wenting Dai; Shuang Chen

    2016-01-01

    At present there are many kinds of fillers and modifier used for modified asphalt, but the effect of modifier differs in thousands of ways; most of them can increase the high temperature performance of asphalt, but the modified effect of low-temperature crack resistance, water stability, and antifatigue performance is different. Aiming at the subsistent problems, this paper innovatively puts forward the idea of taking the silane silica (nanosilica modified with silane coupling agent) as fille...

  10. Safety evaluation of asphalt products, (1)

    International Nuclear Information System (INIS)

    The safety of activity-containing asphalt products kept in enclosed storage was evaluated from considerations of radiolysis and hydrogen evolution. The samples examined were mainly homogeneous asphalt products containing 43w/0 of sludge produced in routine operation of the asphalt plant at the Japan Atomic Energy Research Institute (JAERI), the samples were irradiated with external 60Co γ-ray source to a dose of 109 R. The bulk of the gases evolving from the asphalt product is hydrogen, which constitutes 75 -- 95% of the total gas evolution. The total amount of gases generated during infinite time is proportional to the total exposure dose; hydrogen evolves at a rate of 5.5x10-3 cm3/g.MR. The amount of total gas evolution is governed solely by the quantity of asphalt, and is independent of the sludge contained therein. Nor do differences in the rate of dose appear to have any significant effect. In so far as concerns smallness of radiolysis, slightly better performance can be expected from straight than from blown asphalt. There is no danger of explosion of the asphalt products currently generated at JAERI (10-5 Ci/kg), which can be expected to accumulate in infinite time no more than about 3 cm3 from a 200 l product. Only asphalt products containing activity in concentrations exceeding 10-1 Ci/kg risk explosion when kept in enclosed storage, through accumulation of hydrogen in quantity exceeding the explosion limit in a relatively short time. (auth.)

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

    DEFF Research Database (Denmark)

    Feng, Huan; Hededal, Ole; Stang, Henrik

    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 both material evaluation and structural design purposes, [1],[2]. Discrete element method (DEM) is one...... type of numerical simulation method which allows the finite displacement and rotation of discrete particles, making it an excellent tool to simulate the complex micro interaction between aggregate particles within an asphalt mixture, [3],[4] . In this research, PFC3D – a commercial DEM program – will...... be applied. The work presented here will focus on the discrete element method as a tool for modelling composite materials, i.e. determination of a representative volume; boundary conditions; characterisation of the components mastic (binder + filler) and aggregates; and establishment of virtual test...

  12. Modeling of asphalt-rubber rotational viscosity by statistical analysis and neural networks

    Directory of Open Access Journals (Sweden)

    Luciano Pivoto Specht

    2007-03-01

    Full Text Available It is of a great importance to know binders' viscosity in order to perform handling, mixing, application processes and asphalt mixes compaction in highway surfacing. This paper presents the results of viscosity measurement in asphalt-rubber binders prepared in laboratory. The binders were prepared varying the rubber content, rubber particle size, duration and temperature of mixture, all following a statistical design plan. The statistical analysis and artificial neural networks were used to create mathematical models for prediction of the binders viscosity. The comparison between experimental data and simulated results with the generated models showed best performance of the neural networks analysis in contrast to the statistic models. The results indicated that the rubber content and duration of mixture have major influence on the observed viscosity for the considered interval of parameters variation.

  13. 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.

  14. Study on Producing Heavy Paving Asphalt

    Institute of Scientific and Technical Information of China (English)

    Liu Daosheng; Gao Zhirong; Huo Kaifu; Liao Kejian

    2002-01-01

    The highly viscous crude oil from Shuguang No. 1 zone of Liaohe oilfield features high density,high viscosity and low wax content. It contains no gasoline fraction and its diesel oil fraction yield is only 7.19%, which belongs to the low sulfur naphthenic stocks crude oil. Its heavy fraction is not suited for producing lubricating oil. Its heavy oil, which contains more resins and asphaltenes and less wax, is not an ideal feedstock for catalytic cracking, but is the ideal raw material for producing high-grade paving asphalt.Now this highly viscous crude oil is used as fuel oil after being emulsified in Liaohe oilfield, but its viscosity is so high that it cannot be atomized uniformly and burned completely, resulting not only in waste of oil resource but also in reduction of economical benefit. To make full use of this oil resource and alleviate the shortfall of high grade paving asphalt in China, various brands of asphalt meeting Q/SHR003-1998and ESSO specifications were developed by blending vacuum residue of the said oil and a blending component which are rich in aromatics and deficient in wax. The impact of blending component on properties of blended asphalt has been investigated and road performances of these blended asphalts were studied. The laboratory test results show that the blended asphalts have good road performance and antiaging property.

  15. Rapid determination of actinides in asphalt samples

    International Nuclear Information System (INIS)

    A new rapid method for the determination of actinides in asphalt samples has been developed that can be used in emergency response situations or for routine analysis. If a radiological dispersive device, improvised nuclear device or a nuclear accident such as the accident at the Fukushima Nuclear Power Plant in March, 2011 occurs, there will be an urgent need for rapid analyses of many different environmental matrices, including asphalt materials, to support dose mitigation and environmental clean-up. The new method for the determination of actinides in asphalt utilizes a rapid furnace step to destroy bitumen and organics present in the asphalt and sodium hydroxide fusion to digest the remaining sample. Sample preconcentration steps are used to collect the actinides and a new stacked TRU Resin + DGA Resin column method is employed to separate the actinide isotopes in the asphalt samples. The TRU Resin plus DGA Resin separation approach, which allows sequential separation of plutonium, uranium, americium and curium isotopes in asphalt samples, can be applied to soil samples as well. (author)

  16. Test Research on Multiple Stress Creep Recovery of Different Asphalt Binder%不同沥青胶结料重复蠕变试验研究

    Institute of Scientific and Technical Information of China (English)

    唐颂

    2012-01-01

    利用重复蠕变试验,对3种不同类型沥青结合料进行高温性能评价,试验结果表明,橡胶沥青高温性能明显优于SBS改性沥青,基质沥青最差。对不同粉胶比橡胶沥青胶浆试验分析发现,累积变形增长率随粉胶比变化呈现出峰值关系,粉胶比为0.3时橡胶沥青胶浆高温性能最差,进行橡胶沥青混合料设计时,粉胶比应尽量远离此值。%Multiple stress creep recovery test should be used to evaluate the high temperature properties of three kinds of asphalt binder.The test results show that the high temperature performance of asphalt rubber is obviously superior to SBS modified asphalt and matrix asphalt is the worst.Rubber asphalt rubber paste with different filler-bitumen ratio was discussed,and found that cumulative deformation rate than change with rubber powder present a peak relationship.High-temperature performance is the worst of the asphalt rubber paste when powder glue ratio is 0.3.Powder glue should be as far as possible as the value when asphalt rubber mixture was designed.

  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. Asphalte

    OpenAIRE

    Foley, S.

    1987-01-01

    The Burnett Archive of Working Class Autobiographies was gathered together by John Burnett, David Vincent and David Mayall whilst compiling their three volumes annotated bibliography, "The Autobiography of the Working Class" (Harvester Press, 1984-1989). This book includes descriptions of unpublished autobiographies and indicates their locations. Excerpts from some of the autobiographies have been published in "Destiny obscure: autobiographies of childhood, education, and family from the1820s...

  20. A review of warm mix asphalt technology: Technical, economical and environmental aspects

    OpenAIRE

    H. A. Rondón Quintana; J. A. Hernández Noguera; F. A. Reyes Lizcano

    2015-01-01

    In general terms, warm mix asphalt (WMA) technology has great potential for successful use in road works construction projects. However, concerns remain regarding the durability and behavior of WMA mixtures in the long term, which need to be addressed. This review focuses on the technical, economic and environmental advantages and disadvantages. The review concludes that the main advantageof this technology, at the moment, concerns the environment. At the end of this work, the authors include...

  1. Hierarchical Modeling of Mastic Asphalt in Layered Road Structures Based on the Mori-Tanaka Method

    OpenAIRE

    Richard Valenta; Michal Šejnoha

    2012-01-01

    We present an application of the Mori-Tanaka micromechanical model for a description of the highly nonlinear behavior of asphalt mixtures. This method is expected to replace an expensive finite element-based fully-coupled multi-scale analysis while still providing useful information about local fields on the meso-scale that are not predictable by strictly macroscopic simulations. Drawing on our recent results from extensive experimental and also numerical investigations this paper concentrate...

  2. 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...

  3. Open-graded asphalt concrete filled with a special cement grout

    OpenAIRE

    Lutonský, Filip

    2013-01-01

    Aim of this thesis is the usage of the open-graded asphalt concrete filled with a special cement grout in the road structures. Thesis defines the main concrete properties and explains related legislation and norms that apply. In addition, laboratory design of asfalt mixtures and a tree kind mortal filler and possibilities of mortal filler pigmentation are dealth with. Finally, thesis evaluates the results from various laboratory tests that were performed on the specimens made from final mixtu...

  4. 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...

  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. Rheological evaluation of polymer-modified asphalt binders

    Directory of Open Access Journals (Sweden)

    Mônica Romero Santos Fernandes

    2008-09-01

    Full Text Available Currently, the most used polymer for asphalt binder modification is the thermoplastic elastomer styrene butadiene styrene (SBS and aromatic oil is commonly added to the mixtures to improve their compatibly. This paper proposes the use of oil shale from sedimentary rock as a compatibilizer agent for polymer-modified asphalt binder (PMB. PMBs were produced by mixing a bitumen with a linear SBS copolymer (3.5% (w.w-1 using two oil shale contents (2 and 4% and petroleum aromatic oil to evaluate comparatively the effect of the compatibilizer agent on the SBS PMB properties. The rheological characteristics of the SBS PMBs were analyzed in a dynamic shear rheometer (DSR and the morphology accessed by fluorescence optical microscopy. The viscoelastic behavior of the samples corroborated the results for the classical properties and varied according to the sample morphology and composition. The results indicate that the aromatic and shale oils have similar effects on the microstructure, storage stability and viscoelastic behavior of the PMBs. Thus, shale oil could be successfully used as a compatibilizer agent without loss of properties or could even replace the aromatic oil. Following the Superpave methodology it was observed that the linear- and radial-SBS PMBs and linear-SBS PMB with 2% of shale oil can be used up to 70 °C, and the linear-SBS PMBs with 4% of shale oil or 2% of aromatic oil can be used only up to 64 °C.

  7. Valorization of vinasse as binder modifier in asphalt mixtures

    Directory of Open Access Journals (Sweden)

    Mª José Martínez-Echevarría-Romero

    2015-01-01

    Full Text Available La reutilización de los residuos derivados de los procesos industriales se ha convertido en uno de los objetivos prioritarios de carácter ambiental en la investigación científica y técnica. En el sector de la construcción, se pueden aprovechar materiales residuales de otros procesos en sustitución de materias primas. Este artículo presenta los resultados de un estudio desarrollado con el objetivo de valorizar la vinaza residual del proceso de fabricación de etanol a partir de biomasa, como material modificante del betún utilizado en las mezclas bituminosas. Se han fabricado cuatro mezclas bituminosas tipo AC-16S (1: Betún 50/70, 2: Betún 50/70 + 10%vinaza, 3: Betún-caucho, 4: Betún-caucho + 10%vinaza y se han realizado ensayos de caracterización como son sensibilidad al agua, resistencia a las deformaciones plásticas, rigidez y fatiga.Los resultados muestran que las mezclas modificadas con vinaza mejoran el comportamiento mecánico de la mezcla AC-16 S y contribuye a la revalorización del residuo.

  8. Experimental studies of biodegradation of asphalt by microorganisms

    International Nuclear Information System (INIS)

    On the geological disposal system of the radioactive wastes, the activities of the microorganisms that could degrade the asphalt might be significant for the assessment of the system performance. As the main effects of the biodegradation of the asphalt, the fluctuation of leaching behavior of the nuclides included in asphalt waste has been indicated. In this study, the asphalt biodegradation test was carried out. The microorganism of which asphalt degradation ability was comparatively higher under aerobic condition and anaerobic condition was used. The asphalt biodegradation rate was calculated and it was evaluated whether the asphalt biodegradation in this system could occur. The results show that the asphalt biodegradation rate under anaerobic and high alkali condition will be 300 times lower than under aerobic and neutral pH. (author)

  9. Modification of Asphalt by the Use of Crumb Rubber

    OpenAIRE

    Shah Room; Muhammad Aleem; Muhammad Ahmad Rana; Umair Anwar Awan; Sajjad Ali

    2014-01-01

    Health aspects enforced to ponder a study on asphalt which incorporate rubber crumbs to increase strength and flexibility of asphalt. Disposal of waste tires is a menace and it’s a serious problem globally because it is not easily biodegradable as these tires consume large spaces, open burning cause serious problems. By the use of rubber tires, this scrap is utilized efficiently and reduces the cost of asphalt to produce economical system. The asphalt is absorbed by the rubber par...

  10. Effects of preparation process on performance of rubber modified asphalt

    Science.gov (United States)

    Liu, Hanbing; Luo, Guobao; Wang, Xianqiang; Jiao, Yubo

    2015-06-01

    The rational utilization of waste rubber tire is essential for the environmental protection. Utilizing rubber particles to modify asphalt can not only improve asphalt performance, but also help the recycling of waste materials. Considering the effect of different preparation process parameters on the performance of rubber modified asphalt, this paper analyzes the effects of the shear temperature, shear time and shear rate on the performance of rubber modified asphalt, and provided a reference for its preparation.

  11. 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...

  12. Influence of crumb rubber gradation on asphalt-rubber properties

    OpenAIRE

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

    2006-01-01

    Asphalt rubber is a material produced by the incorporation of crumb rubber obtained from ground tires in straight asphalt and its properties are influenced by the components properties. The crumb rubber gradation is one of the variables which have a significant influence on asphalt rubber properties. Thus, this work studies the influence of crumb rubber gradation on the asphalt rubber properties expressed by penetration, rotational viscosity (using the Brookfield viscometer), r...

  13. Surface roughness of an asphalt concrete and its mechanical behavior

    OpenAIRE

    MOMM, L; DE LA ROCHE, C; Domingues, A.

    2003-01-01

    The surface roughness of asphalt concrete is studied according to the maximum aggregate size and to the equation of the aggregate graduation curve, on asphalt concrete plates made in laboratory. The macrotexture increases when the maximum aggregate size increases and it decreases when the aggregate fine contents increases. The asphalt concrete structural behaviour is evaluated with rutting, complex modulus and fatigue tests. The study shows stronger mechanical performances on the asphalt conc...

  14. Biodegradation of Asphalt Cement-20 by Aerobic Bacteria

    OpenAIRE

    Pendrys, John P.

    1989-01-01

    Seven gram-negative, aerobic bacteria were isolated from a mixed culture enriched for asphalt-degrading bacteria. The predominant genera of these isolates were Pseudomonas, Acinetobacter, Alcaligenes, Flavimonas, and Flavobacterium. The mixed culture preferentially degraded the saturate and naphthene aromatic fractions of asphalt cement-20. A residue remained on the surface which was resistant to biodegradation and protected the underlying asphalt from biodegradation. The most potent asphalt-...

  15. Theoretic computing model of combustion process of asphalt smoke

    Institute of Scientific and Technical Information of China (English)

    HUANG Rui; CHAI Li-yuan; HE De-wen; PENG Bing; WANG Yun-yan

    2005-01-01

    Based on the data and methods provided by research literature, dispersing mathematical model of combustion process of asphalt smoke is set by theoretic analysis. Through computer programming, the dynamic combustion process of asphalt smoke is calculated to simulate an experimental model. The computing result shows that the temperature and the concentration of asphalt smoke influence its burning temperature in approximatively linear manner. The consumed quantity of fuel to ignite the asphalt smoke needs to be measured from the two factors.

  16. Low Temperature Performance of Wax Modified Mastic Asphalt

    OpenAIRE

    Butt, Ali Azhar

    2009-01-01

    The current interest in energy saving asphalt production techniques is great and several new processes have been developed to reduce the mixing and compaction temperatures for hot mix asphalt. In particular, mastic asphalt products (Gussasphalt) require high working temperatures, and harder requirements concerning bitumen fumes and carbon dioxide emissions have been introduced for such products. Consequently, the need of a new means of producing and placing mastic asphalt at lower temperature...

  17. 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,…

  18. 40 CFR 52.2054 - Control of asphalt paving material.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 4 2010-07-01 2010-07-01 false Control of asphalt paving material. 52... asphalt paving material. (a) Notwithstanding any provisions to the contrary in the Pennsylvania Implementation Plan, the Pennsylvania Department of Transportation shall restrict the annual usage of asphalts...

  19. 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.

  20. 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.

  1. 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...

  2. 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.

  3. Ethanol based foamed asphalt as potential alternative for low emission asphalt technology

    Directory of Open Access Journals (Sweden)

    Mohd Rosli Mohd Hasan

    2016-04-01

    Full Text Available Foamed asphalt typically relies on water as a foaming agent because water becomes gaseous at elevated temperatures, generating numerous tiny bubbles in the asphalt and causing spontaneous foaming. In this study, ethanol was used as a potential alternative to water as a foaming agent. Ethanol is expected to be a physical blowing agent in the same manner as water, except it requires less energy to foam due to its 78 °C boiling point. This study compares the performance of water and ethanol as foaming agents through the measurements of rotational viscosity, the reduction in temperature during foaming, and volatile loss. The ethanol-foamed asphalt binders were prepared at 80 °C and 100 °C, while the water-foamed asphalt binders were prepared at 100 °C and 120 °C. Additionally, the rolling thin film oven (RTFO was used to generate short-term aging of the foamed asphalt binders. A rotational viscometer was used to determine the viscosity of the asphalt binders at 80 °C, 100 °C, 120 °C, 140 °C, and 160 °C. Overall, ethanol can function in the same manner as water but requires less energy to foam. It is proven based on the smaller drop in temperature of the asphalt binder foamed using ethanol compared with that prepared with water. This is due to the lower latent heat capacity of ethanol, which requires less energy to vaporize compared with water. Through the rotational viscometer test, ethanol performs better in lowering the viscosity of asphalt binders, which is essential in allowing production processes at low temperatures, as well as a better workability and aggregate coating. Ethanol can be expelled from the foamed asphalt binders at a higher rate due to its lower boiling point and latent heat.

  4. Finite element simulation of asphalt fatigue testing

    DEFF Research Database (Denmark)

    Ullidtz, Per; Kieler, Thomas Lau; Kargo, Anders

    1997-01-01

    The traditional interpretation of fatigue tests on asphalt mixes has been in terms of a logarithmic linear relationship between the constant stress or strain amplitude and the number of load repetitions to cause failure, often defined as a decrease in modulus to half the initial value. To...... accomodate non-constant stress or strain, a mode factor may be introduced or the dissipated energy may be used instead of stress or strain.Cracking of asphalt (or other materials) may be described as a process consisting of three phases. In phase one diffuse microcracking is formed in the material. In the...... damage mechanics.The paper describes how continuum damage mechanics may be used with a finite element program to explain the progressive deterioration of asphalt mixes under laboratory fatigue testing. Both constant stress and constant strain testing are simulated, and compared to the actual results from...

  5. Influence of Compaction Temperature on Resistance Under Monotonic Loading of Crumb-Rubber Modified Hot-Mix Asphalts

    Directory of Open Access Journals (Sweden)

    Hugo A. Rondón-Quintana

    2012-12-01

    Full Text Available The influence of compaction temperature on resistance under monotonic loading (Marshall of Crumb-Rubber Modified (CRM Hot-Mix Asphalt (HMA was evaluated. The emphasis of this study was the application in Bogotá D.C. (Colombia. In this city the compaction temperature of HMA mixtures decreases, compared to the optimum, in about 30°C. Two asphalt cements (AC 60-70 and AC 80-100 were modified. Two particle sizes distribution curve were used. The compaction temperatures used were 120, 130, 140 and 150°C. The decrease of the compaction temperature produces a small decrease in resistance under monotonic loading of the modified mixtures tested. Mixtures without CRM undergo a lineal decrease in its resistance of up to 34%.

  6. Influence of Compaction Temperature on Resistance Under Monotonic Loading of Crumb-Rubber Modified Hot-Mix Asphalts

    Directory of Open Access Journals (Sweden)

    Hugo A. Rondón-Quintana

    2012-12-01

    Full Text Available The influence of compaction temperature on resistance under mono-tonic loading (Marshall of Crumb-Rubber Modified (CRM Hot-Mix As-phalt (HMA was evaluated. The emphasis of this study was the applica-tion in Bogotá D.C. (Colombia. In this city the compaction temperature of HMA mixtures decreases, compared to the optimum, in about 30°C. Two asphalt cements (AC 60-70 and AC 80-100 were modified. Two particle sizes distribution curve were used. The compaction temperatures used were 120, 130, 140 and 150°C. The decrease of the compaction tempera-ture produces a small decrease in resistance under monotonic loading of the modified mixtures tested. Mixtures without CRM undergo a lineal decrease in its resistance of up to 34%.

  7. Use of Recycling Building Demolition waste As Coarse Aggregate in Hot Mix Asphalt

    Directory of Open Access Journals (Sweden)

    Nabil I. Al- Sarrag* Hanaa Khaleel A Suham E. Saleh Al-Maliky

    2014-04-01

    Full Text Available At the recent years in Iraq, building demolition increase because of wars and the processes of destruction that lead to increase concrete waste, causing extreme pressure on the available land-filled sites that’s becomes a new challenge to local environment, in addition to south region from country poor from aggregate source.  So this study make as first evaluation to return use concrete aggregate for old and demolition building in concrete asphalt mix, the concrete aggregate obtained from building to live long more than 20 years after crash reinforcement concrete and sieving to get requirement granular particle to make locally asphalt mixture (Type IIIB depends on modified specification of State Commission of Roads and Bridges (2003 with percent (0,25,50,75,100% from weight of coarse aggregate.  Asphalt mixtures were tested by Marshall test, Indirect tensile strength test, and the loss of stability test.

  8. Rutting analysis of 100 mm diameter polypropylene modified asphalt specimens using gyratory and Marshall compactors

    Directory of Open Access Journals (Sweden)

    Serkan Tapkın

    2013-04-01

    Full Text Available Compaction technique used in Marshall design does not model the process of actual rolling procedures on site exactly. Carrying out laboratory compaction of dense bituminous mixtures with Superpave gyratory compactors is a more realistic way of simulating actual compaction. In this study, mechanical differences of reference and polypropylene modified asphalt mixtures were compared using Superpave gyratory and Marshall compaction methods by carrying out repeated creep tests utilising universal testing machine. In addition, there is no standard Superpave design procedure for 100 mm diameter samples till date. The other purpose of this study is to propose new standards for the compaction and testing procedures of these 100 mm specimens. Indeed, extensive studies have shown that the design gyration number should be 40 for reference and 33 for polypropylene modified specimens under medium traffic conditions for the similar and specific type of aggregate sources, bitumen, aggregate gradation, mix proportioning, modification technique and laboratory conditions. Moreover, it was shown that, the asphalt samples produced by Superpave gyratory compactor were much resistant to destructive rutting effects than the asphalt specimens prepared by Marshall design.

  9. 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.

  10. 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.

  11. Mechanical properties of hot mix asphalt made with recycled aggregates from reclaimed construction and demolition debris

    Directory of Open Access Journals (Sweden)

    Taibo, J.

    2007-03-01

    Full Text Available The mix design for asphalt mixtures containing recycled aggregates from construction and demolition debris was evaluated. The tests conducted to characterize the mechanical behaviour of these mixtures showed that the mechanical properties of mixtures with recycled and virgin aggregate are similar. The asphalt mixtures containing recycled aggregate proved to have lower resistance to water action. Nonetheless, recycled aggregate was found to be potentially usable in asphalt mixtures if higher quality materials are selected and such low resistance is corrected. This will call for expanding upon the preliminary work described in the present article.En este trabajo se dosificaron mezclas bituminosas fabricadas con áridos reciclados de residuos de construcción y demolición. Se realizaron una serie de ensayos que permitieron caracterizar el comportamiento mecánico de estas mezclas. Los parámetros mecánicos de las mezclas con áridos reciclados son similares a los de las mezclas fabricadas únicamente con áridos naturales de cantera. Sin embargo, las mezclas bituminosas con áridos reciclados tuvieron un mal comportamiento frente a la disminución de la resistencia por pérdida de cohesión por la acción del agua. No obstante, mediante la selección de materiales de mejor calidad y corrección de este mal comportamiento, existen posibilidades de utilizar áridos reciclados en mezclas bituminosas. Para ello será necesario ampliar la primera aproximación realizada en este artículo.

  12. Investigation on the Effect of Recycled Asphalt Shingle (RAS in Portland Cement Mortar

    Directory of Open Access Journals (Sweden)

    Jinwoo An

    2016-04-01

    Full Text Available Tear-off roofing shingle, referred to as Reclaimed asphalt shingle (RAS, is the byproduct of construction demolition and it is a major solid waste stream in the U.S. Reuse of this byproduct in road construction sector can contribute to the success of materials sustainability as well as landfill conservation. Ground RAS has similar particle distribution as sand and its major component includes aggregate granules, fibers, and asphalt. To promote the beneficial utilization of RAS, this study evaluates the effect of RAS in cement mortar when used as replacement of sand. In addition, the study investigates how cellulose fibers from RAS behave under high alkaline environment during cement hydration process, which may significantly affect mortar’s strength performance. The laboratory study includes measurements of physical, mechanical, and durability behaviors of cement mortar containing RAS replacing sand up to 30%. It was found that the optimum mixture proportions are 5% and 10% for compressive strength and toughness, respectively.

  13. Surface roughness effects on the solar reflectance of cool asphalt shingles

    Energy Technology Data Exchange (ETDEWEB)

    Akbari, Hashem; Berdahl, Paul; Akbari, Hashem; Jacobs, Jeffry; Klink, Frank

    2008-02-17

    We analyze the solar reflectance of asphalt roofing shingles that are covered with pigmented mineral roofing granules. The reflecting surface is rough, with a total area approximately twice the nominal area. We introduce a simple analytical model that relates the 'micro-reflectance' of a small surface region to the 'macro-reflectance' of the shingle. This model uses a mean field approximation to account for multiple scattering effects. The model is then used to compute the reflectance of shingles with a mixture of different colored granules, when the reflectances of the corresponding mono-color shingles are known. Simple linear averaging works well, with small corrections to linear averaging derived for highly reflective materials. Reflective base granules and reflective surface coatings aid achievement of high solar reflectance. Other factors that influence the solar reflectance are the size distribution of the granules, coverage of the asphalt substrate, and orientation of the granules as affected by rollers during fabrication.

  14. Effect of hydrated lime and cement on moisture damage of recycled mixtures with foamed bitumen and emulsion

    OpenAIRE

    Nosetti, R.A.; Pérez Jiménez, Félix Edmundo; Martínez Reguero, Adriana Haydée; Miró Recasens, José Rodrigo

    2016-01-01

    Cold recycling with foamed bitumen can be used as a sustainable and cost-effective rehabilitation technique. This paper focuses on the evaluation of the resistance to the water action in mixtures with reclaimed asphalt pavement (RAP) and foamed bitumen by means of indirect tensile test, comparing the effect of two active fillers: cement and hydrated lime. Additionally, mixtures recycled with RAP and asphalt emulsions were also tested in order to compare the response of both technologies. Resu...

  15. 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...

  16. 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.

  17. Excess Foundry Sand Characterization and Experimental Investigation in Controlled Low-Strength Material and Hot-Mixing Asphalt

    Energy Technology Data Exchange (ETDEWEB)

    Pauul J. Tikalsky

    2004-10-31

    This report provides technical data regarding the reuse of excess foundry sand. The report addresses three topics: (1) a statistically sound evaluation of the characterization of foundry sand, (2) a laboratory investigation to qualify excess foundry sand as a major component in controlled low-strength material (CLSM), and (3) the identification of the best methods for using foundry sand as a replacement for natural aggregates for construction purposes, specifically in asphalt paving materials. The survival analysis statistical technique was used to characterize foundry sand over a full spectrum of general chemical parameters, metallic elements, and organic compounds regarding bulk analysis and leachate characterization. Not limited to characterization and environmental impact, foundry sand was evaluated by factor analyses, which contributes to proper selection of factor and maximization of the reuse marketplace for foundry sand. Regarding the integration of foundry sand into CLSM, excavatable CLSM and structural CLSM containing different types of excess foundry sands were investigated through laboratory experiments. Foundry sand was approved to constitute a major component in CLSM. Regarding the integration of foundry sand into asphalt paving materials, the optimum asphalt content was determined for each mixture, as well as the bulk density, maximum density, asphalt absorption, and air voids at N{sub ini}, N{sub des}, and N{sub max}. It was found that foundry sands can be used as an aggregate in hot-mix asphalt production, but each sand should be evaluated individually. Foundry sands tend to lower the strength of mixtures and also may make them more susceptible to moisture damage. Finally, traditional anti-stripping additives may decrease the moisture sensitivity of a mixture containing foundry sand, but not to the level allowed by most highway agencies.

  18. Excess Foundry Sand Characterization and Experimental Investigation in Controlled Low-Strength Material and Hot-Mixing Asphalt

    Energy Technology Data Exchange (ETDEWEB)

    Tikalsky, Paul J. [Pennsylvania State Univ., University Park, PA (United States); Bahia, Hussain U. [Univ. of Wisconsin, Madison, WI (United States); Deng, An [Pennsylvania State Univ., University Park, PA (United States); Snyder, Thomas [Univ. of Wisconsin, Madison, WI (United States)

    2004-10-15

    This report provides technical data regarding the reuse of excess foundry sand. The report addresses three topics: a statistically sound evaluation of the characterization of foundry sand, a laboratory investigation to qualify excess foundry sand as a major component in controlled low-strength material (CLSM), and the identification of the best methods for using foundry sand as a replacement for natural aggregates for construction purposes, specifically in asphalt paving materials. The survival analysis statistical technique was used to characterize foundry sand over a full spectrum of general chemical parameters, metallic elements, and organic compounds regarding bulk analysis and leachate characterization. Not limited to characterization and environmental impact, foundry sand was evaluated by factor analyses, which contributes to proper selection of factor and maximization of the reuse marketplace for foundry sand. Regarding the integration of foundry sand into CLSM, excavatable CLSM and structural CLSM containing different types of excess foundry sands were investigated through laboratory experiments. Foundry sand was approved to constitute a major component in CLSM. Regarding the integration of foundry sand into asphalt paving materials, the optimum asphalt content was determined for each mixture, as well as the bulk density, maximum density, asphalt absorption, and air voids at Nini, Ndes, and Nmax. It was found that foundry sands can be used as an aggregate in hot-mix asphalt production, but each sand should be evaluated individually. Foundry sands tend to lower the strength of mixtures and also may make them more susceptible to moisture damage. Finally, traditional anti-stripping additives may decrease the moisture sensitivity of a mixture containing foundry sand, but not to the level allowed by most highway agencies.

  19. Asphalt modification with used lubricating oil

    Energy Technology Data Exchange (ETDEWEB)

    Villanueva, A.; Ho, S.; Zanzotto, L. [Calgary Univ., AB (Canada). Schulich School of Engineering, Bituminous Materials Research Laboratory

    2008-02-15

    A method of recycling waste lubricating oil from vehicles was presented. Various asphalt materials were modified with different amounts of lubricating oil and analyzed using standard Superpave tests. Dynamic shear rheometer (DSR) tests were then conducted to in order to obtain high temperature samples. Bending beam rheometer (BBR) and direct tension tests (DTT) were used to obtain low temperature sample profiles. Potential applications for the materials were reviewed. Environmental impacts and costs associated with using the materials were also presented. The study demonstrated that waste lubricating oil can be used as a softening agent in modified asphalt binders using a low temperature grade technique. It was concluded that the low cost of waste lubricating oil in Alberta makes it a potential resource for asphalt modification. The oil modified samples lowered the high-temperature grade and did not improve the overall quality of the asphalt. Further testing is needed to examine the quality and consistency of lubricating oils. 19 refs., 7 tabs., 12 figs.

  20. Determining and Modeling Asphalt Concrete Response (ACRe)

    NARCIS (Netherlands)

    Erkens, S.M.J.G.; Poot, M.R.

    2000-01-01

    In road engineering research and design the principles of material mechanics have not yet become a standard tool. In this contribution a project aimed at applying these principles to asphalt concrete is presented. Attention is paid to the differences between the standard test procedures and those ba

  1. Finite element simulation of asphalt fatigue testing

    DEFF Research Database (Denmark)

    Ullidtz, Per; Kieler, Thomas Lau; Kargo, Anders

    damage mechanics.The paper describes how continuum damage mechanics may be used with a finite element program to explain the progressive deterioration of asphalt mixes under laboratory fatigue testing. Both constant stress and constant strain testing are simulated, and compared to the actual results from...

  2. Microbial Life in a Liquid Asphalt Desert

    Science.gov (United States)

    Schulze-Makuch, Dirk; Haque, Shirin; de Sousa Antonio, Marina Resendes; Ali, Denzil; Hosein, Riad; Song, Young C.; Yang, Jinshu; Zaikova, Elena; Beckles, Denise M.; Guinan, Edward; Lehto, Harry J.; Hallam, Steven J.

    2011-04-01

    Pitch Lake in Trinidad and Tobago is a natural asphalt reservoir nourished by pitch seepage, a form of petroleum that consists of mostly asphaltines, from the surrounding oil-rich region. During upward seepage, pitch mixes with mud and gases under high pressure, and the lighter portion evaporates or is volatilized, which produces a liquid asphalt residue characterized by low water activity, recalcitrant carbon substrates, and noxious chemical compounds. An active microbial community of archaea and bacteria, many of them novel strains (particularly from the new Tar ARC groups), totaling a biomass of up to 107 cells per gram, was found to inhabit the liquid hydrocarbon matrix of Pitch Lake. Geochemical and molecular taxonomic approaches revealed diverse, novel, and deeply branching microbial lineages with the potential to mediate anaerobic hydrocarbon degradation processes in different parts of the asphalt column. In addition, we found markers for archaeal methane metabolism and specific gene sequences affiliated with facultative and obligate anaerobic sulfur- and nitrite-oxidizing bacteria. The microbial diversity at Pitch Lake was found to be unique when compared to microbial communities analyzed at other hydrocarbon-rich environments, which included Rancho Le Brea, a natural asphalt environment in California, USA, and an oil well and a mud volcano in Trinidad and Tobago, among other sites. These results open a window into the microbial ecology and biogeochemistry of recalcitrant hydrocarbon matrices and establish the site as a terrestrial analogue for modeling the biotic potential of hydrocarbon lakes such as those found on Saturn's largest moon Titan.

  3. 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.

  4. Linear viscoelastic limits of asphalt concrete at low and intermediate temperatures

    Science.gov (United States)

    Mehta, Yusuf A.

    The purpose of this dissertation is to demonstrate the hypothesis that a region at which the behavior of asphalt concrete can be represented as a linear viscoelastic material can be determined at low and intermediate temperatures considering the stresses and strains typically developed in the pavements under traffic loading. Six mixtures containing different aggregate gradations and nominal maximum aggregate sizes varying from 12.5 to 37.5 mm were used in this study. The asphalt binder grade was the same for all mixtures. The mixtures were compacted to 7 +/- 1% air voids, using the Superpave Gyratory Compactor. Tests were conducted at low temperatures (-20°C and -10°C), using the indirect tensile test machine, and at intermediate temperatures (4°C and 20°C), using the Superpave shear machine. To determine the linear viscoelastic range of asphalt concrete, a relaxation test for 150 s, followed by a creep test for another 150 s, was conducted at 150 and 200 microstrains (1 microstrain = 1 x 10-6), at -20°C, and at 150 and 300 microstrains, at -10°C. A creep test for 200 s, followed by a recovery test for another 200 s, was conducted at stress levels up to 800 kPa at 4°C and up to 500 kPa at 20°C. At -20°C and -10°C, the behavior of the mixtures was linear viscoelastic at 200 and 300 microstrains, respectively. At intermediate temperatures (4°C and 20°C), an envelope defining the linear and nonlinear region in terms of stress as a function of shear creep compliance was constructed for all the mixtures. For creep tests conducted at 20°C, it was discovered that the commonly used protocol to verify the proportionality condition of linear viscoelastic behavior was unable to detect the appearance of nonlinear behavior at certain imposed shear stress levels. Said nonlinear behavior was easily detected, however, when checking the satisfaction of the superposition condition. The envelope constructed for determining when the material becomes nonlinear should be

  5. An Improvement in Electrical Properties of Asphalt Concrete

    Institute of Scientific and Technical Information of China (English)

    WU Shao-peng; MO Lian-tong; SHUI Zhong-he; XUAN Dong-xing; XUE Yong-jie; YANG Wen-feng

    2002-01-01

    Materials such as Koch AH - 70, basalt aggregate, limestone powder and graphite particles were used to prepare conductive asphalt concrete, which is a new type of multi functional concrete. The mix proportion by weight was shown as follows. Fineaggregates (2.36-4.75 mm):fine aggregates (< 2.36mm): limestone powder: asphalt = 120:240: 14:30. The content of added graphite particles ranged from 0% to 20% ( by the Special weight of asphalt concerte). A conductive asphalt concrete with a resistivity around 10-103·Ωm was obtained.attention was paid to the effects of graphite content, graphite physical-chemical properties, asphalt content and temperature on the resistivity. Furthermore, an attempt was made to develop an electrically conductive model for asphalt concrete.

  6. 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.

  7. 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...

  8. 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...

  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. Evaluation of asphalt-rubber membrane field performance

    Science.gov (United States)

    Shuler, S.; Gallaway, B. M.; Epps, J. A.

    1982-05-01

    This report presents a record of asphalt-rubber membrane field performance in Texas. An evaluation of performance is presented for forty-five separate projects in thirteen state highway districts. Approximately 850 lane miles of highways are represented by materials constructed as stress absorbing membranes (asphalt-rubber seal coats beneath asphalt concrete overlay). All projects reviewed were constructed between June, 1976 and September, 1981.

  11. Performance Evaluation of Semiplastic Recycled Cold Asphalt Using Noncement Binders

    OpenAIRE

    Lee, Byung Jae; Bang, Jin Wook; Kim, Jeong Su; Jang, Young Il

    2015-01-01

    The optimal mixing conditions for semiplastic recycled cold asphalt, which recycled waste asphalt and used noncement binders (NCB), were assessed through verification of the performance. The NCB of 6% desulfurization gypsum mixing was found to have the most outstanding properties. For the Marshall stability, 4% (NCB) filler mixing brought about a 1.92-time strength increase effect compared to OPC (2%) and was improved when using modified asphalt and SBR. The flow test results showed that alth...

  12. Extending the Life of Asphalt Longitudinal Paving Joints

    OpenAIRE

    Hedges, Rex; Brownridge, Jim

    2014-01-01

    Is premature asphalt joint failure bringing your PASER number down? Participants will learn how applying asphalt preservative seals directly to the asphalt longitudinal paving joint can restore plasticity and flexibility and how application of in-depth sealing methods will protect against harmful UV rays, prevent oxidation, and waterproof against chloride intrusion. Rehabilitation methods to repair poorly performing and failed paving joints will also be covered.

  13. Bone Glue Modified Asphalt: A Step towards Energy Conservation and Environment Friendly Modified Asphalts

    Science.gov (United States)

    Rizvi, Hashim Raza; Gallo, August A.

    2014-01-01

    Asphalt has been modified for the past several decades using various additives, including synthetic polymers. Polymer modification improves structural and engineering characteristics of the binder, which is a result of improvement in rheological characteristics of binder as well as its adhesion capability with the aggregate. Such enhancement inevitably enhances the performance characteristics of hot mix asphalts (HMA) such as fatigue life, resistance to rutting, and thermal cracking. Even though polymer-modified HMA is popular in North America and European countries, its use is still limited in developing countries of Southeast Asia due to high costs associated with its manufacturing, processing, and energy consumption. In this study, a new kind of asphalt modifier derived from animal wastes, such as bones, hides, and flesh commonly known as Bone Glue, is studied. This biomaterial which is a by-product of food and cattle industries is cheap, conveniently available, and produced locally in developing countries. The results of the research study showed that the bone glue can easily be mixed with asphalt without significantly altering the asphalt binder's viscosity and mixing and compaction temperatures of HMA. Additionally, improvements in complex shear modulus for a range of temperatures were also determined and it was found that complex shear modulus was improved by bone glue modification.

  14. 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.

  15. Modification of Asphalt by the Use of Crumb Rubber

    Directory of Open Access Journals (Sweden)

    Shah Room

    2014-01-01

    Full Text Available Health aspects enforced to ponder a study on asphalt which incorporate rubber crumbs to increase strength and flexibility of asphalt. Disposal of waste tires is a menace and it’s a serious problem globally because it is not easily biodegradable as these tires consume large spaces, open burning cause serious problems. By the use of rubber tires, this scrap is utilized efficiently and reduces the cost of asphalt to produce economical system. The asphalt is absorbed by the rubber particles which swells at high temperature allowing greater concentration of liquid asphalt. The partial replacement of crumb rubber in asphalt is 5%, 10%, 15%, and 20% (D05, D10, D15, and D20. The analysis of incorporated asphalt was done in hot mix asphalt. The generated results showed that the value for resilient modulus and creep stiffness is more as compared to the conventional asphalt and in the accumulated strain the values are much lesser which is positive approach.

  16. Hanford Permanent Isolation Barrier Program: Asphalt technology development

    Energy Technology Data Exchange (ETDEWEB)

    Freeman, H.D.; Romine, R.A.

    1994-11-01

    An important component of the Hanford Permanent Isolation Barrier is the use of a two-layer composite asphalt system, which provides backup water diversion capabilities if the primary capillary barrier fails to meet infiltration goals. Because of asphalt`s potential to perform to specification over the 1000-year design life criterion, a composite asphalt barrier (HMAC/fluid-applied polymer-modified asphalt) is being considered as an alternative to the bentonite clay/high density poly(ethylene) barriers for the low-permeability component of the Hanford Permanent Isolation Barrier. The feasibility of using asphalt as a long-term barrier is currently being studied. Information that must be known is the ability of asphalt to retain desirable physical properties over a period of 1000 years. This paper presents the approach for performing accelerated aging tests and evaluating the performance of samples under accelerated conditions. The results of these tests will be compared with asphalt artifact analogs and the results of modeling the degradation of the selected asphalt composite to make life-cycle predictions.

  17. Creep Characteristics of Crumb Rubber Modified Asphalt Binder

    Institute of Scientific and Technical Information of China (English)

    WANG Lan; CHANG Chunqing; XING Yongming

    2011-01-01

    Crumb rubber modified asphalt containing 20 percent crumb rubber particles of 30mesh has been examined by Scanning Electron Microscope (SEM) to observe the microcosmic appearance and the characteristic distribution of crumb rubber particles in asphalt. The SEM pictures reveal that the crumb rubber particles distribute evenly in the asphalt and they are compatible well with asphalt. The shear creep test of crumb rubber modified asphalt was carried out at - 10 ℃ and 40 ℃ by Dynamic Shear Rheology (DSR). The shearing deformation at different temperature and creep stiffness modulus curve at loading stage of crumb rubber modified asphalt have been measured. The stiffness modulus of crumb rubber modified asphalt is much temperature sensitive and it decays much quick at the early stage of loading than normal asphalt. The rate of decay of stiffness modulus is slow at the subsequent stage and stiffness modulus approaches to a stable value at the final stage at a higher temperature. In addition, Burgers model is suitable to describe and simulate experimental results of viscoelastic properties of the crumb rubber modified asphalt.

  18. Safety evaluation of asphalt products for final disposal

    International Nuclear Information System (INIS)

    Under the present situation, the wastes concentrated according to the radioactivity level, the properties and the environmental conditions are usually solidified in view of limiting the escape of the radioactive substances to the environment as small as possible by containment. The materials used for the solidification are cement, asphalt, plastics, ceramics and so on, and the selection is made by taking the kinds and radioactivity level of wastes, final disposing method, economy and handling into consideration. Asphalt is more suitable than cement to the wastes coming from PWR power plants, which contain boric acid for controlling nuclear reaction, and the effect of reducing the volume of wastes is high. It is economical when a certain scale is reached, accordingly recently, the use of asphalt for the solidification of wastes is going to increase. For the solidification of low level wastes, straight-run asphalt is suitable, and for high level wastes, heat-resistant blown asphalt is suitable. Asphalt-solidified bodies can contain 40-60 wt.% of wastes without any problem. The present situation of asphalt solidification in foreign countries, the physical properties required for the disposal of asphalt-solidified bodies, and the leaching, combustibility, radiation resistance and form stability of asphalt-solidified bodies are described. (Kako, I.)

  19. Field testing of asphalt-emulsion radon-barrier system

    International Nuclear Information System (INIS)

    Three years of laboratory and field testing have demonstrated that asphalt emulsion seals are effective radon diffusion barriers. Both laboratory and field tests in 1979, 1980 and 1981 have shown that an asphalt emulsion seal can reduce radon fluxes by greater than 99.9%. The effective diffusion coefficient for the various asphalt emulsion admix seals averages about 10-6 cm2/s. The 1981 joint field test is a culmination of all the technology developed to date for asphalt emulsion radon barrier systems. Preliminary results of this field test and the results of the 1980 field test are presented. 18 figures, 6 tables

  20. Performance Evaluation of Semiplastic Recycled Cold Asphalt Using Noncement Binders

    Directory of Open Access Journals (Sweden)

    Byung Jae Lee

    2015-01-01

    Full Text Available The optimal mixing conditions for semiplastic recycled cold asphalt, which recycled waste asphalt and used noncement binders (NCB, were assessed through verification of the performance. The NCB of 6% desulfurization gypsum mixing was found to have the most outstanding properties. For the Marshall stability, 4% (NCB filler mixing brought about a 1.92-time strength increase effect compared to OPC (2% and was improved when using modified asphalt and SBR. The flow test results showed that although an increase dosage of filler and SBR decreased the flow value of the semiplastic recycled cold asphalt, an increase dosage of asphalt emulsion improved the flow value. The indirect tensile strength and liquid immersion residual stability for the condition with greatest Marshall stability were most outstanding with 0.95 MPa and 83.6%, respectively. Evaluation of the recycled cold asphalt abrasion durability revealed that for the case of mixing more than 4% NCB the mass loss rate was lower than 20%. The abrasion durability was found to improve when using modified emulsified asphalt and SBR substitution. From the test results, it was found that the optimal mixing proportion of semiplastic recycled cold asphalt satisfied mechanical properties and durability is NCB with 4%, emulsified asphalt with 3%, and SBR substitution with 20%.

  1. 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.

  2. 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.

  3. 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...

  4. 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...

  5. Injuries in short track asphalt racing.

    Science.gov (United States)

    Busby, J D

    1978-10-01

    Stock car racing is a popular activity. Although spectators are seldom injured, drivers at short asphalt tracks often sustain minor injuries. The neck and the knee are the most commonly injured areas. Rigid safety requirements are essential and help to prevent serious injuries. Severe injuries occur on an average of once a year, but no fatalities have been recorded at one short track that has been studied for a six-year period. PMID:707264

  6. Effect of waste plastic bottles on the stiffness and fatigue properties of modified asphalt mixes

    International Nuclear Information System (INIS)

    Highlights: • PET reduced the mix stiffness at both temperatures of 5 and 25 °C. • PET improved the fatigue behavior at both testing temperatures. • At more than 210 microstrain, adding temperature resulted in higher fatigue life. • SBS modified mixes showed better fatigue behavior than PET modified ones. • Overall PET had comparable effects to SBS on the stiffness and fatigue behavior. - Abstract: Nowadays, the use of recycled waste materials as modifier additives in asphalt mixes could have several economic and environmental benefits. The main purpose of this research was to investigate the effect of waste plastic bottles (Polyethylene Terephthalate (PET)) on the stiffness and specially fatigue properties of asphalt mixes at two different temperatures of 5 and 20 °C. Likewise, the effect of PET was compared to styrene butadiene styrene (SBS) which is a conventional polymer additive which has been vastly used to modify asphalt mixes. Different PET contents (2–10% by weight of bitumen) were added directly to mixture as the method of dry process. Then the resilient modulus and fatigue tests were performed on cylindrical specimens with indirect tensile loading procedure. Overall, the mix stiffness reduced by increasing the PET content. Although stiffness of asphalt mix initially increased by adding lower amount of PET. Based on the results of resilient modulus test, the stiffness of PET modified mix was acceptable and warranted the proper deformation characteristics of these mixes at heavy loading conditions. At both temperatures, PET improved the fatigue behavior of studied mixes. PET modified mixes revealed comparable stiffness and fatigue behavior to SBS at 20 °C. However, at 5 °C the fatigue life of SBS modified mixes was to some extent higher than that of PET modified ones especially at higher strain levels of 200 microstrain

  7. Active carbon production from modified asphalt

    International Nuclear Information System (INIS)

    A granular activated carbons (GACs) have been prepared from some local raw materials such as Qiayarah asphalt (QA) after some modification treatments of this asphalt by various ratios of its original constituents (asphaltenes and maltens) at 180 degree C. Thermal carbonization method by sulfur and steam physical activation have been used for AC preparation. The carbons thus prepared were characterized in the term of iodine, methylene blue (MB), P-nitro phenol (PNP) and CCl4 adsorption. The BET surface area of the prepared ACs has been estimated via a calibration curve between iodine numbers and surface area determined from N2 adsorption isotherm from previous studies, also, the surface area of the prepared ACs were determined through another methods such as retention method by ethylene glycol mono ethyl ether (EGME), adsorption from vapor phase using acetone vapor and adsorption from solution method using PNP and MB as solutes. The results referred to the success of modification method for preparing ACs of good micro porosity as compared with the AC from the untreated asphalt as well as the commercial sample. (author)

  8. Method of interrupting asphalt solidifying operation

    International Nuclear Information System (INIS)

    Purpose: To shorten the time required for interrupting operation, by specifying methods of supplying and interrupting liquid wastes, water and asphalts. Method: Electrical power supply for a heat medium heater is disconnected simultaneously with the start for the stopping operation. The temperature for the heat medium is detected by a heat medium thermometer, the flow rate of a waste liquid supply pump is reduced by way of a rotation controller for the liquid waste supply pump and the amount of liquid wastes supplied is gradually decreased along with the reduction in the temperature for the heat medium. Then, when the temperature for the heat medium lowered to about 190 - 2100C, supply of the liquid wastes is interrupted and cleaning water is supplied to a liquid wastes supply tank while closing the liquid wastes supply tank main valve and opening a cleaning water valve to thereby clean the radioactive substances. Then, after stopping the supply of the cleaning water, asphalt is continued to be supplied for several minutes, the radioactive substances deposited in an evaporator and an agitation blade are sufficiently washed out. Then, after stopping the asphalt tank, operations for the driving device and the heat medium pump are stopped. This enables cooling for the heat medium in a short time using no exclusive heat medium cooler, as well as clean the radioactive substances. (Horiuchi, T.)

  9. A review of warm mix asphalt technology: Technical, economical and environmental aspects

    Directory of Open Access Journals (Sweden)

    H. A. Rondón Quintana

    2015-12-01

    Full Text Available In general terms, warm mix asphalt (WMA technology has great potential for successful use in road works construction projects. However, concerns remain regarding the durability and behavior of WMA mixtures in the long term, which need to be addressed. This review focuses on the technical, economic and environmental advantages and disadvantages. The review concludes that the main advantageof this technology, at the moment, concerns the environment. At the end of this work, the authors include certain recommendations for future works in order to continue strengthening the development of WMA technology.

  10. 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

  11. Rubber Modified Asphalt and Applications in Road%橡胶改性沥青的研究与道路应用

    Institute of Scientific and Technical Information of China (English)

    曹萍; 胡阳; 孙皓; 王雷

    2012-01-01

    The research and applications of crumb rubber modified asphalt in the fields of traffic and construction play an important part in sustainable development in Chinese rubber industry. At present, the crumb rubber modified asphalt for road construction technology has made ??great progress in China. Rubber asphalt is a mixture of asphalt binder, which is prepared by some process with using crumb rubber powder as modifier. The composition of the rubber powder, characteristics of rubber asphalt and the development process of road construction with using crumb rubber at home and abroad is summarized. Some successful applications of rubber asphalt at home and abroad are introduced, as well as the characteristics of rubber asphalt and the influencing factors on performance index.%废橡胶粉改性沥青在交通和建筑等领域的研究与应用,是我国橡胶行业走可持续发展道路的重要内容.目前我国废橡胶粉用于改性沥青的筑路技术已经取得了很大的进展.橡胶沥青是采用废旧轮胎经过粉碎后制成的胶粉作为改性剂,再通过一定的生产工艺得到能够改善混合料性能的沥青结合料.概述了橡胶粉的组成和橡胶沥青的特点、国外胶粉用于筑路技术的发展历程及我国胶粉在筑路中的发展和应用情况.介绍了橡胶沥青在国内外的成功应用经验、特点和指标性能的影响因素.

  12. 7 CFR 2902.36 - Concrete and asphalt release fluids.

    Science.gov (United States)

    2010-01-01

    ... 7 Agriculture 15 2010-01-01 2010-01-01 false Concrete and asphalt release fluids. 2902.36 Section... PROCUREMENT Designated Items § 2902.36 Concrete and asphalt release fluids. (a) Definition. Products that are designed to provide a lubricating barrier between the composite surface materials (e.g., concrete...

  13. 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

  14. 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

  15. Basics of a Good Road: Asphalt and Aggregates

    OpenAIRE

    Huber, Gerry

    2014-01-01

    This Asphalt 101 presentation will focus on binder (liquid asphalt) production, covering the following specific topics: how it is produced, PG grades and modification (certified binder supplier program), product transportation, and storage at plant. Additionally, aggregate production will be covered, including sizing, gradations, types (slag, limestone, gravel), and Indiana sources and quality (CAPP).

  16. Hot asphalt burns: a review of injuries and management options.

    Science.gov (United States)

    Bosse, George M; Wadia, Shernaz A; Padmanabhan, Pradeep

    2014-07-01

    Hot asphalt burns to human tissue can increase the likelihood of infection and potential conversion of partial thickness to full-thickness injuries. Successful intervention for hot asphalt burns requires immediate and effective cooling of the asphalt on the tissue followed by subsequent gradual removal of the cooled asphalt. A review of the literature reveals that multiple substances have been used to remove asphalt, including topical antibiotics, petroleum jelly, a commercial product known as De-Solv-It (ORANGE-SOL, Chandler, AZ), sunflower oil, baby oil, liquid paraffin, butter, mayonnaise, and moist-exposed burn ointment (MEBO). Although many of these products may be effective in the removal of asphalt, they may not be readily available in an emergency department setting. Topical antibiotics are readily available, are more commonly described in the medical literature, and would be expected to be effective in the removal of asphalt. We developed guidelines for on scene (first-aid) management and the initial care of such patients upon presentation to a health care facility. These guidelines emphasize the principles of early cooling, gradual removal of adherent asphalt using topical antibiotics, and avoidance of the use of topical agents, which are likely to result in tissue toxicity. PMID:24630605

  17. 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.

  18. Improving the quality of asphalt coating with carbon nanomodifiers

    Science.gov (United States)

    Larisa, Urkhanova; Nikolay, Shestakov; Aleksandr, Semenov; Natalya, Smirnyagina; Irina, Semenova

    2015-07-01

    This article deals with the possibility of modifying the binder by adding carbon nanomodifier to bitumen to improve the quality of asphalt. Addition of 0.05%-0.5% of nanomodifier significantly changes the properties of bitumen. Asphalt with this astringent has increased strength, heat resistance and shear resistance.

  19. Hanford Permanent Isolation Barrier Program: Asphalt technology development

    International Nuclear Information System (INIS)

    An important component of the Hanford Permanent Isolation Barrier is the use of a two-layer composite asphalt system, which provides backup water diversion capabilities if the primary capillary barrier fails to meet infiltration goals. Because of asphalt's potential to perform to specification over the 1000-year design life criterion, a composite asphalt barrier (HMAC/fluid-applied polymer-modified asphalt) is being considered as an alternative to the bentonite clay/high density poly(ethylene) barriers for the low-permeability component of the Hanford Permanent Isolation Barrier. The feasibility of using asphalt as a long-term barrier is currently being studied. Information that must be known is the ability of asphalt to retain desirable physical properties over a period of 1000 years. This paper presents the approach for performing accelerated aging tests and evaluating the performance of samples under accelerated conditions. The results of these tests will be compared with asphalt artifact analogs and the results of modeling the degradation of the selected asphalt composite to make life-cycle predictions

  20. 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.

  1. 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.

  2. 40 CFR Table 1 of Subpart Aaaaaaa... - Emission Limits for Asphalt Processing (Refining) Operations

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 14 2010-07-01 2010-07-01 false Emission Limits for Asphalt Processing... Area Sources: Asphalt Processing and Asphalt Roofing Manufacturing Other Requirements and Information... of Part 63—Emission Limits for Asphalt Processing (Refining) Operations For * * * You must meet...

  3. 40 CFR 443.30 - Applicability; description of the asphalt roofing subcategory.

    Science.gov (United States)

    2010-07-01

    ... asphalt roofing subcategory. 443.30 Section 443.30 Protection of Environment ENVIRONMENTAL PROTECTION... MATERIALS (TARS AND ASPHALT) POINT SOURCE CATEGORY Asphalt Roofing Subcategory § 443.30 Applicability; description of the asphalt roofing subcategory. The provisions of this subpart are applicable to...

  4. 40 CFR 443.20 - Applicability; description of the asphalt concrete subcategory.

    Science.gov (United States)

    2010-07-01

    ... asphalt concrete subcategory. 443.20 Section 443.20 Protection of Environment ENVIRONMENTAL PROTECTION... MATERIALS (TARS AND ASPHALT) POINT SOURCE CATEGORY Asphalt Concrete Subcategory § 443.20 Applicability; description of the asphalt concrete subcategory. The provisions of this subpart are applicable to...

  5. 40 CFR 443.40 - Applicability; description of the linoleum and printed asphalt felt subcategory.

    Science.gov (United States)

    2010-07-01

    ... linoleum and printed asphalt felt subcategory. 443.40 Section 443.40 Protection of Environment... PAVING AND ROOFING MATERIALS (TARS AND ASPHALT) POINT SOURCE CATEGORY Linoleum and Printed Asphalt Felt Subcategory § 443.40 Applicability; description of the linoleum and printed asphalt felt subcategory....

  6. 40 CFR 443.10 - Applicability; description of the asphalt emulsion subcategory.

    Science.gov (United States)

    2010-07-01

    ... asphalt emulsion subcategory. 443.10 Section 443.10 Protection of Environment ENVIRONMENTAL PROTECTION... MATERIALS (TARS AND ASPHALT) POINT SOURCE CATEGORY Asphalt Emulsion Subcategory § 443.10 Applicability; description of the asphalt emulsion subcategory. The provisions of this subpart are applicable to...

  7. 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.

  8. 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.

  9. Effect of ageing on fatigue properties of asphalt

    Institute of Scientific and Technical Information of China (English)

    王佶; 庞凌; 吴少鹏; 刘全涛; 陈筝

    2008-01-01

    The fatigue properties of asphalts were investigated after various laboratory simulation ageing tests and outdoor natural exposure ultraviolet radiation ageing,by dynamic shear rheometer(DSR) time sweep fatigue test in constant strain model and a new type of specimen which was introduced to avoid the problem of adhesion failure between rotor and asphalt binder.The results show that outdoor natural exposure ageing(NEA) causes the decrease of retained fatigue life distinctly,and photodegradation caused by outdoor NEA of 1 250 μm thin films asphalt for three months,is found to be severer than pressure ageing vessel(PAV) with respects to retained fatigue life.The effect of photodegradation increases as the time of outdoor NEA increases.DSR time sweep fatigue test in constant strain indicates that the aged styrene-butadiene-styrene(SBS) modified asphalt still displays better fatigue properties than the corresponding base asphalt after ageing.

  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. 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.

  12. Proposed Testing Procedure for Estimation of Effective Recycling Ratio of Aged Asphalt in Hot Recycling Technical Conditions%老化沥青热再生有效再生率检测方法

    Institute of Scientific and Technical Information of China (English)

    杨毅文; 马涛; 卞国剑; 金晶; 黄晓明

    2011-01-01

    基于对流传质理论分析了沥青路面热再生过程中老化沥青与新沥青、再生剂的混溶机理,认为老化沥青预热温度、再生剂扩散能力以及再生沥青混合料拌和时间是影响老化沥青有效再生率的重要因素.设计提出了能够良好模拟实际热再生工艺条件的老化沥青有效再生率检测方法,试验分析了老化沥青预热温度、再生剂添加与否、再生沥青混合料拌和时间对老化沥青有效再生率的影响.试验结果验证了所设计检测方法的可行性,据此可为老化沥青再生效果的评价以及老化沥青热再生工艺条件的设计提供有利依据.%Based on the convective mass transfer theory, the mechanism of mixing of aged asphalt, new asphalt and recycling agent in asphalt pavement hot recycling projects was studied. It was deemed that the heating temperature of aged asphalt, the diffusing capability of recycling agent and the mixing time of recycling asphalt mixture could have important influence on the effective recycling ratio of aged asphalt. Therefore , a testing procedure well simulating the real technical conditions to estimate the effective recycling ratio of aged asphalt was designed. And the influences of heating temperature of aged asphalt, using recycling agent or not and mixing time of recycling asphalt mixture on the effective recycling ratio of aged asphalt were studied. Based on the test results, the feasibility of the new testing procedure is proved. It will be helpful for the evaluation of recycling effect of aged asphalt and the design of hot recycling technical conditions.

  13. Surface Modification of Fire-retardant Asphalt with Silane Coupling Agent

    Institute of Scientific and Technical Information of China (English)

    CHEN Huiqiang; TANG Boming

    2012-01-01

    The theory and approach of the surface modified of asphalt fire-retardant with silane coupling agent were introduced,The optimum silane dosage was determined,and the structure and properties of the asphalt fire-retardant before and after the surface modification were characterized by infrared spectrum and thermo gravimetric analysis.The dispersion effect of asphalt fire-retardant was studied.The influence of the surface modification on the hydrophilicity and lipophilicity of the asphalt fire-retardant was analyzed.The experimental results showed that there were physical and chemical interactions between the silane coupling agent and the asphalt fire-retardant,which reduced the surface polarity of the asphalt fire retardant.The optimum silane coupling agent dosage was 0.95% of the asphalt fire retardant.The surface modification improved the thermal stability,dispersibility and lipophilicity of the asphalt fire retardant,which enhanced the compatibility between asphalt fire retardant and asphalt.

  14. Experimental determination of the minimum onset temperature of runaway reaction from a radioactive salt disposal in asphalt

    International Nuclear Information System (INIS)

    In order to clarify the reason for the most hazardous explosion in the history of the Japanese nuclear power development by a radioactive salt disposal in asphalt, an adiabatic process was developed using a Dewar vessel to minimize the temperature difference between the reactants and the surroundings. By this means, the heat evolution from a reaction which is readily lost can be detected at a lower temperature imitating the accidental condition. A series of ambient temperature-tracking Dewar experiments on asphalt salt mixtures were conducted under different initial ambient temperatures, such as 230, 210, 190, and 170 deg. C, respectively. As a result, it was observed that from 190 deg. C the sample's temperature rose until a runaway reaction occurred. The minimum onset temperature for the runaway reaction of the asphalt salt mixture was determined to be 190 deg. C, which is close to the initial temperature of approximately 180 deg. C, the same temperature as the real accident. This implies that at near this operational temperature, initial faint chemical reactions may occur and lead to further rapid reactions if heat is accumulated at this stage

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

    OpenAIRE

    Yuri KALGIN; Alexander STROKIN

    2016-01-01

    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 an...

  16. The first engineered self-healing asphalt road: How is it performing?

    OpenAIRE

    Liu, Q.; Schlangen, H.E.J.G.; Van Bochove, G.

    2013-01-01

    Porous asphalt shows excellent performance in both noise reduction and water drainage. Although porous asphalt has these great qualities, its service life is much shorter (sometimes only half) compared to dense graded asphalt roads. Ravelling, which is the loss of aggregate particles from the surface layer, is the main damage mechanism of porous asphalt surface wearing courses. In this research, an induction healing approach (namely, activating the healing process of asphalt concrete through ...

  17. 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...

  18. Modeling and Simulation of Flow and Formation Damage of Asphalt-Paved Roads

    OpenAIRE

    M. H. Alawi; M. M. El-Qadi; M. A. El-Ameen

    2013-01-01

    Porous asphalt is a standard asphalt built on aggregate storage bed which allows water to drain through it and reduces stormwater runoff. However, porosity of the porous asphalt and the storage bed may be effectively reduced due to trapping suspended solids from the water or from the asphalt damage. In this paper, we present mathematical modeling and numerical simulation of flow and damage of porous asphalt-paved roads. A mathematical model to describe the fine-particles transport carried by ...

  19. Microbial Life in a Liquid Asphalt Desert

    CERN Document Server

    Schulze-Makuch, Dirk; Antonio, Marina Resendes de Sousa; Ali, Denzil; Hosein, Riad; Song, Young C; Yang, Jinshu; Zaikova, Elena; Beckles, Denise M; Guinan, Edward; Lehto, Harry J; Hallam, Steven J

    2010-01-01

    An active microbiota, reaching up to 10 E+7 cells/g, was found to inhabit a naturally occurring asphalt lake characterized by low water activity and elevated temperature. Geochemical and molecular taxonomic approaches revealed novel and deeply branching microbial assemblages mediating anaerobic hydrocarbon degradation, metal respiration and C1 utilization pathways. These results open a window into the origin and adaptive evolution of microbial life within recalcitrant hydrocarbon matrices, and establish the site as a useful analog for the liquid hydrocarbon environments on Saturn's moon Titan.

  20. Hierarchical Modeling of Mastic Asphalt in Layered Road Structures Based on the Mori-Tanaka Method

    Directory of Open Access Journals (Sweden)

    Richard Valenta

    2012-01-01

    Full Text Available We present an application of the Mori-Tanaka micromechanical model for a description of the highly nonlinear behavior of asphalt mixtures. This method is expected to replace an expensive finite element-based fully-coupled multi-scale analysis while still providing useful information about local fields on the meso-scale that are not predictable by strictly macroscopic simulations. Drawing on our recent results from extensive experimental and also numerical investigations this paper concentrates on principal limitations of the Mori-Tanaka method, typical of all two-point averaging schemes, when appliedto material systems prone to evolving highly localized deformation patterns such as a network of shear bands. The inability of the Mori-Tanaka method to properly capture the correct stress transfer between phases with increasing compliance of the matrix phase is remedied here by introducing a damage like parameter into the local constitutive equation of reinforcements (stones to control an amount of stress taken by this phase. A deficiency of the Mori-Tanaka method in the prediction of creep response is also mentioned particularly in the light of large scale simulations. A comparison with the application of macroscopic homogenized constitutive model for an asphalt mixture is also presented.