The Experts below are selected from a list of 4140 Experts worldwide ranked by ideXlab platform
Hussain U. Bahia - One of the best experts on this subject based on the ideXlab platform.
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effects of recycling agents ras on Rutting Resistance and moisture susceptibility of mixtures with high rap ras content
Construction and Building Materials, 2021Co-Authors: Yuan Zhang, Hussain U. BahiaAbstract:Abstract Increasing the content of Recycled Asphalt Materials (RAM) in Hot Mix Asphalt (HMA) requires a comprehensive understanding of the effects of RAM on pavement performance. While there is a significant focus on the benefits of adding the Recycling Agents (RAs) in terms of cracking Resistance of high RAM mixtures, limited research is published on the Rutting and moisture damage of high RAM mixtures containing significant amounts of Recycling Agents. This study investigates the effects of RAs on the Rutting Resistance and moisture susceptibility of high RAM mixtures through analysis of analyzing the Hamburg Wheel-Track Test (HWTT) data with current AASHTO method and a modified analysis method separating the dry from the wet behavior. The RAM employed in this study includes Reclaimed Asphalt Pavements (RAP) and Recycled Asphalt Shingles (RAS). Two levels of high RAP mixtures (30% and 50%) and one combination of RAP and RAS (30% + 5%) were used to fabricate test asphalt mixtures and compared to a control mixture with no RAM. One petroleum-based RA (REOB) and two bio-based RAs were used to soften these mixtures using pre-determined dosages. In total thirteen-three mixture combinations were prepared and measured in this study. The HWTT test parameters recommended in the current AASHTO method were calculated and compared with the parameters determined by using a modified analysis method, in which the deformation due to the visco-plastic flow is separated from the deformation induced by moisture in the wet HWTT. The results illustrate that in general high RAM improved the Rutting Resistance and moisture susceptibility as compared to the virgin mixture, but some of the RAs used, show an alarming increase in the moisture susceptibility potential of the high RAM mixtures. It is therefore concluded that caution should be used in analysis of the HWTT Rutting behavior of high RAM mixes as the RA used could result in inferior Rutting behavior under wet conditions.
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modelling of aggregates contact mechanics to study roles of binders and aggregates in asphalt mixtures Rutting
Road Materials and Pavement Design, 2020Co-Authors: Cheng Ling, Hussain U. BahiaAbstract:Rutting Resistance is one of the essential needs in the design of asphalt mixtures. Volumteric properties, binder modification, aggregates properties, and performance tests such as the triaxial tes...
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More Practical Wheel Tracking Test for Rutting Resistance of Asphalt Mixtures
Transportation Research Record: Journal of the Transportation Research Board, 2019Co-Authors: Zachary Lemke, Hussain U. BahiaAbstract:Wheel tracking tests have seen a vast increase in usage among various state department of transportations for measuring Rutting Resistance of mixtures that already meet volumetric property requirem...
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importance of binder modification type and aggregate structure on Rutting Resistance of asphalt mixtures using image based multi scale modelling
Road Materials and Pavement Design, 2017Co-Authors: Cheng Ling, Amir Arshadi, Hussain U. BahiaAbstract:Permanent deformation is known as one of the most critical distresses observed in asphalt pavements, and is known to depend on asphalt binder, aggregates and voids, which are the components of asphalt mixture. This study is an effort to investigate the effect of asphalt binder modification type and aggregate structure on Rutting Resistance through experimentation and finite-element simulation. Asphalt binders with different levels of non-recoverable compliance (Jnr) and elastic recovery (%R) based on the Multiple Stress Creep Recovery test were selected. Asphalt mixtures with different aggregate gradations were prepared for testing and image processing for numerical simulation. A flow number test was conducted on the mixture samples to obtain the asphalt mixture Rutting performance. A two-dimensional (2D) image analysis was also conducted on the mixture samples to characterise their internal aggregate structures. In addition, a recently developed image-based multi-scale finite-element model was used to pr...
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Mechanisms of asphalt mixture Rutting in the dry Hamburg Wheel Tracking test and the potential to be alternative test in measuring Rutting Resistance
Construction and Building Materials, 2017Co-Authors: Preeda Chaturabong, Hussain U. BahiaAbstract:Abstract Rutting is one of the most important failures occurring in hot mix asphalt (HMA) especially in the summer season and slow moving traffic areas. Rutting is a pavement surface failure compromising the safety and ride comfort of traveling and thus needs to be accurately evaluated in a laboratory. Although the flow number (FN) test is commonly used for evaluating the Rutting Resistance of HMA in a laboratory, there are some shortcomings in using FN test such as the costly and complicated equipment. Another potential test that is likely to be more advantageous than the FN test for evaluating the Rutting Resistance is the Hamburg Wheel Tracking (HWT) test, however, it is typically conducted in wet condition, and inadequate results in dry condition have been reported. The objective in this study is to optimize the HWT test subject to dry condition to be one potential method in measuring Rutting Resistance in a laboratory. Two Rutting mechanisms (densification and shear failure) of HMA samples conducted in the HWT device were determined by Image Processing and Analysis version 2 (IPAS 2 ). Results indicate that HMA samples under the dry HWT test can exhibit both Rutting mechanisms in which typically occur in the field. Also, the dry HWT test shows a very good R 2 for a relation of creep slope with the confined and unconfined FN test. As a result, the dry HWT can be an effective tool of quantifying Rutting potential with better simulating to field behavior, lower cost of equipment, and less complicated geometry that can also accommodate field cores.
Hassan Ziari - One of the best experts on this subject based on the ideXlab platform.
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Rutting Resistance fatigue properties and temperature susceptibility of nano clay modified asphalt rubber binder
Construction and Building Materials, 2021Co-Authors: Amir Amini, Hassan Ziari, Seyed Amir Saadatjoo, Negar Sadat Hashemifar, Ahmad GoliAbstract:Abstract In this study, Rutting performance, fatigue response and, rheological properties of CRMN (Crumb Rubber Modified Nano-clay) binders were investigated using the Multiple Stress Creep and Recovery (MSCR), Linear Amplitude Sweep (LAS) and, Superpave tests. The physical and rheological tests indicate that adding nanoclay (NC) to asphalt rubber binder (ARB) can decrease temperature susceptibility and improve the aging Resistance and rheological properties of ARB. MSCR test results show that the addition of NC reduces the permanent strain and increases the Rutting Resistance of ARB samples. In addition, the GTR15%+NC4% sample has the best Rutting Resistance, which improves performance grade from PG 58S-22 to PG 70H–28. LAS test indicated that the presence of a polymer network in ARB at low strain increases the fatigue life, however, increasing the strain causes the slipping and destruction of the polymer network. The addition of NC led to a delay in the oxidation process and improve the aging Resistance, hence increasing fatigue life of ARB binders. Finally, the ANOVA and Tukey analysis showed that increasing GTR and NC have a considerable effect on Rutting performance, PG teخهe range and temperature susceptibility of ARB.
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investigating the effect of amorphous carbon powder on the moisture sensitivity fatigue performance and Rutting Resistance of rubberized asphalt concrete mixtures
Construction and Building Materials, 2019Co-Authors: Hassan Ziari, Hassan Divandari, Mojtaba Hajiloo, Amir AminiAbstract:Abstract In recent years, the significant importance of solid waste management, increase in the cost of bitumen and polymer modifiers have encouraged the pavement engineers to use reusable alternative sources. Ground tire rubber (GTR) and amorphous carbon powder (ACP) are considered as two industrial waste which their using in asphalt mixture prevents their releasing in the environment. This study aims to analyze moisture sensitivity, fatigue performance, and Rutting Resistance of asphalt mixture influenced by using GTR (8, 12, and 16% of bitumen weight) as the modifier of bitumen properties, and ACP (25, 50, and 75% of filler weight) as filler. The results of this study shows that the ACP increases the resilient modulus and indirect tensile strength of rubberized asphalt concrete (RAC) mixtures. The results revealed that despite the negative effect of GTR on the moisture Resistance of asphalt mixture, ACP improves the moisture performance. The results of fracture energy also implies that using ACP decreases the fracture energy, but using the GTR improves the fatigue Resistance of asphalt mixture. Furthermore, the results of dynamic creep and wheel track tests indicates that 16GTR + 50ACP has the lowest permanent deformation and highest Rutting Resistance. The results of ANOVA analysis demonstrates that using GTR and ACP has a considerable effect on the performance properties of asphalt mixture. Finally, the results of this study illustrate the simultaneous use cleaner production and wasted materials decreases the environmental damages in addition to improvement of physical properties of the asphalt mixture.
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The effect of EAF dust and waste PVC on moisture sensitivity, Rutting Resistance, and fatigue performance of asphalt binders and mixtures
Construction and Building Materials, 2019Co-Authors: Hassan Ziari, Elahe Nasiri, Amir Amini, Omid FerdosianAbstract:Abstract Considering the increase in the amount of industrial waste in recent years, the reuse of recycled materials has become commonplace in various industries. In the pavement industry, such recycled materials can be used as a modifier of the asphalt mixtures. Electric arc furnace dust (EAFD) and waste polyvinyl chloride (PVC) are two industrial waste materials that are hazardous to the environment. This study aimed to investigate the effect of EAFD and PVC materials on the physical, mechanical, and chemical properties of asphalt binders and mixtures. For this purpose, chemical properties, microstructural characteristics, fatigue life, and Rutting Resistance of EAFD and PVC modified asphalt binders were studied using FTIR, SEM, LAS, and MSCR tests, respectively. In addition, the effect of PVC and EAFD additives on tensile strength, moisture sensitivity, and Rutting performance of asphalt mixtures were evaluated. The results of the FTIR test showed that the addition of EAFD and PVC additives to asphalt binder significantly reduce the carbonyl index of neat asphalt binder and improve the moisture sensitivity and aging Resistance of asphalt binders and mixtures. The results of the MSCR test indicated that EAFD and PVC additives reduce asphalt binder strain and subsequently increase Rutting Resistance, especially at high stress levels. Also, according to the results of the LAS test, adding PVC and EAFD powders to neat asphalt binder increase the fatigue Resistance of asphalt binder against micro-crackers at low strain levels. The results of experiments on asphalt mixtures showed that EAFD and PVC additives improve tensile strength, moisture susceptibility, and Rutting performance of asphalt mixtures. Overall, the results of this study illustrated that using EAFD and PVC waste materials in pavement industry, not only eliminate environmental problems caused by these materials and reduce the cost of stabilizing them, but also improve the technical performance of asphalt binders and mixtures.
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characterization of Rutting Resistance of ebs modified asphalt mixtures
Petroleum Science and Technology, 2016Co-Authors: Hassan Ziari, Mostafa Nakhaei, Aliasghar Akbari Nasrekani, Ali MoniriAbstract:ABSTRACTDriven by Kyoto protocol to reduce the gas emission, warm mix asphalt (WMA) as an alternative of hot mix asphalt has gained huge interest among researchers. Despite many advantages, Rutting Resistance of WMAs is always questionable. In this study, ethylene bis(stearamide) (EBS) was used as a wax-based additive to produce WMAs. Samples were produced at three different compaction temperatures. To evaluate Rutting Resistance of mixtures, all cylindrical specimens were tested by dynamic creep and dynamic modulus tests at various compaction temperatures. Results indicate that Rutting Resistance of EBS-modified samples are remarkable, especially when compaction temperature is low.
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new achievements on positive effects of nanotechnology zyco soil on Rutting Resistance and stiffness modulus of glasphalt mix
Construction and Building Materials, 2015Co-Authors: Hassan Ziari, N Kamboozia, Hamid Behbahani, Mahmoud AmeriAbstract:Abstract On the basis of previous studies, it has been demonstrated that glass is capable of improving the behavioral characteristics of asphalt mixtures. The purpose of the present study is to assess the effect of nanotechnology zycosoil on Rutting Resistance and stiffness modulus of glasphalt mixtures through laboratory experiment. For this purpose asphalt samples with two types of graining in their optimal percentage of bitumen were subject to the dynamic tests and their mechanical properties are evaluated. Eventually, observations on the creeping behavior and stiffness modulus of the asphalt samples with two different graining types for the different percentages of waste crushed glass have been presented. The results of the study indicate that the samples of glasphalt modified with nanotechnology zyco-soil show a remarkably better performance as compared to the samples of conventional asphalt.
Qiao Dong - One of the best experts on this subject based on the ideXlab platform.
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Factors affecting the Rutting Resistance of asphalt pavement based on the field cores using multi-sequenced repeated loading test
Construction and Building Materials, 2020Co-Authors: Zili Zhao, Qiao Dong, Jiwang Jiang, Jitong DingAbstract:Abstract Rutting or permanent deformation is one of the main failure modes in hot mix asphalt (HMA) pavement. Since laboratory-produced specimens could hardly reflect the actual compaction condition and material properties of asphalt mixtures in the field, it is necessary to evaluate Rutting Resistance in situ pavement conditions based on field cores. In this study, field cores of 30 different road sections were collected from 7 different highways in Jiangsu Province, China. A newly developed multi-sequenced repeated load (MSRL) test by Southeast University was conducted on both full-depth specimens and separated layers considering the actual load-axle spectrum and temperature gradient in the corresponding sections. A new indicator, Compound Strain Rate ( e c ), which indicates the deformation rate of asphalt mixtures under the actual load-axle spectrum, was proposed to evaluate the Rutting-resistant of different field materials. Then, statistical evaluation including distribution analysis and Analysis of Variance (ANOVA) were conducted on the test results. According to the analysis of the correlation between e c of full-depth specimens with samples from different layers, the Rutting Resistance of the middle layer presents the most significant influence on the high-temperature stability of the full-depth pavement structure. In terms of material factors, binder type exhibits a significant effect on the Rutting Resistance of all layers while gradations only influence the results of the top layer. Considering the external factors, both road age and the accumulative number of equivalent single axle loads (ESAL) could influence the Rutting Resistance of different field materials, especially, the e c of materials from the middle layer. Moreover, the influence of material factors on permanent deformation performance of asphalt pavement under different traffic loads was analyzed.
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Rutting Resistance of porous asphalt mixture under coupled conditions of high temperature and rainfall
Construction and Building Materials, 2018Co-Authors: Xiaowei Wang, Hanyu Deng, Qiao DongAbstract:Abstract Porous asphalt (PA) mixtures work real coupled conditions of high temperature and rainfall in rainy summer weather. The objective of this study is to develop a multi-physics repeated loading permanent deformation (MRLPD) test that can evaluate the Rutting Resistance of the PA mixture under such real coupled conditions. A multi-physics chamber was designed for the MRLPD test to achieve real coupled conditions of dry, rainfall onset, ongoing rainfall, and rainfall end, which are consistent with the rainfall process. Under the rainfall onset and ongoing rainfall conditions, the Rutting Resistance of the PA mixture is lower than that under the dry condition. PA mixture shows the poorest Rutting Resistance under the ongoing rainfall condition. The presence of water in the pores creates pore pressure, which facilitates moisture damage and consequently decreases the Rutting Resistance. The more time the PA mixture stays in a saturated state, the lower the Rutting Resistance is. PA mixture exhibits the best Rutting Resistance under the rainfall end condition because the pore pressure absorbs part of the loads and the decreased temperature of the specimen. The Rutting Resistance of the PA mixture is more sensitive to temperature and overloading than to moisture damage. Under the coupled conditions, high temperature accelerates the evolution of moisture damage, which leads to the acceleration of Rutting failure.
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evaluation of permanent deformation of multilayer porous asphalt courses using an advanced multiply repeated load test
Construction and Building Materials, 2018Co-Authors: Xiaowei Wang, Qiao Dong, Jiwang JiangAbstract:Abstract Multilayer porous asphalt (PA) courses have the advantages of runoff mitigation, rainwater management and noise reduction. The objective of this paper was to develop an advanced multiply-repeated load test which can effectively simulate the field conditions, including confinement condition, actual temperature distribution, and axle load spectrum. And it was used to evaluate the Rutting Resistance of multilayer PA courses in this study. Rutting Resistance of single, double, and triple-layer PA courses and traditional dense graded asphalt courses (control) were investigated under three axle load spectrums. Rutting Resistance indicators, such as multiple flow number and loading sensitivity curve, were utilized to evaluate the Rutting Resistance. The result indicates that the percentage of heavy axle loads in the load spectrum plays a vital role in the Rutting development of multilayer PA courses. The Rutting Resistance of four multilayer asphalt courses was compared and the control was the best, following by the single, double, and triple-layer PA courses. The addition of fiber in porous asphalt mixture can remarkably improve the Rutting Resistance of multilayer PA courses. Based on the results, it can be concluded that the single-layer PA courses can be used in heavy traffic roads and has been validated by field constructions. The double and triple-layer PA courses are only recommended in medium traffic roads, and the performance in the field need further investigated and validated.
Amir Amini - One of the best experts on this subject based on the ideXlab platform.
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Rutting Resistance fatigue properties and temperature susceptibility of nano clay modified asphalt rubber binder
Construction and Building Materials, 2021Co-Authors: Amir Amini, Hassan Ziari, Seyed Amir Saadatjoo, Negar Sadat Hashemifar, Ahmad GoliAbstract:Abstract In this study, Rutting performance, fatigue response and, rheological properties of CRMN (Crumb Rubber Modified Nano-clay) binders were investigated using the Multiple Stress Creep and Recovery (MSCR), Linear Amplitude Sweep (LAS) and, Superpave tests. The physical and rheological tests indicate that adding nanoclay (NC) to asphalt rubber binder (ARB) can decrease temperature susceptibility and improve the aging Resistance and rheological properties of ARB. MSCR test results show that the addition of NC reduces the permanent strain and increases the Rutting Resistance of ARB samples. In addition, the GTR15%+NC4% sample has the best Rutting Resistance, which improves performance grade from PG 58S-22 to PG 70H–28. LAS test indicated that the presence of a polymer network in ARB at low strain increases the fatigue life, however, increasing the strain causes the slipping and destruction of the polymer network. The addition of NC led to a delay in the oxidation process and improve the aging Resistance, hence increasing fatigue life of ARB binders. Finally, the ANOVA and Tukey analysis showed that increasing GTR and NC have a considerable effect on Rutting performance, PG teخهe range and temperature susceptibility of ARB.
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investigating the effect of amorphous carbon powder on the moisture sensitivity fatigue performance and Rutting Resistance of rubberized asphalt concrete mixtures
Construction and Building Materials, 2019Co-Authors: Hassan Ziari, Hassan Divandari, Mojtaba Hajiloo, Amir AminiAbstract:Abstract In recent years, the significant importance of solid waste management, increase in the cost of bitumen and polymer modifiers have encouraged the pavement engineers to use reusable alternative sources. Ground tire rubber (GTR) and amorphous carbon powder (ACP) are considered as two industrial waste which their using in asphalt mixture prevents their releasing in the environment. This study aims to analyze moisture sensitivity, fatigue performance, and Rutting Resistance of asphalt mixture influenced by using GTR (8, 12, and 16% of bitumen weight) as the modifier of bitumen properties, and ACP (25, 50, and 75% of filler weight) as filler. The results of this study shows that the ACP increases the resilient modulus and indirect tensile strength of rubberized asphalt concrete (RAC) mixtures. The results revealed that despite the negative effect of GTR on the moisture Resistance of asphalt mixture, ACP improves the moisture performance. The results of fracture energy also implies that using ACP decreases the fracture energy, but using the GTR improves the fatigue Resistance of asphalt mixture. Furthermore, the results of dynamic creep and wheel track tests indicates that 16GTR + 50ACP has the lowest permanent deformation and highest Rutting Resistance. The results of ANOVA analysis demonstrates that using GTR and ACP has a considerable effect on the performance properties of asphalt mixture. Finally, the results of this study illustrate the simultaneous use cleaner production and wasted materials decreases the environmental damages in addition to improvement of physical properties of the asphalt mixture.
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The effect of EAF dust and waste PVC on moisture sensitivity, Rutting Resistance, and fatigue performance of asphalt binders and mixtures
Construction and Building Materials, 2019Co-Authors: Hassan Ziari, Elahe Nasiri, Amir Amini, Omid FerdosianAbstract:Abstract Considering the increase in the amount of industrial waste in recent years, the reuse of recycled materials has become commonplace in various industries. In the pavement industry, such recycled materials can be used as a modifier of the asphalt mixtures. Electric arc furnace dust (EAFD) and waste polyvinyl chloride (PVC) are two industrial waste materials that are hazardous to the environment. This study aimed to investigate the effect of EAFD and PVC materials on the physical, mechanical, and chemical properties of asphalt binders and mixtures. For this purpose, chemical properties, microstructural characteristics, fatigue life, and Rutting Resistance of EAFD and PVC modified asphalt binders were studied using FTIR, SEM, LAS, and MSCR tests, respectively. In addition, the effect of PVC and EAFD additives on tensile strength, moisture sensitivity, and Rutting performance of asphalt mixtures were evaluated. The results of the FTIR test showed that the addition of EAFD and PVC additives to asphalt binder significantly reduce the carbonyl index of neat asphalt binder and improve the moisture sensitivity and aging Resistance of asphalt binders and mixtures. The results of the MSCR test indicated that EAFD and PVC additives reduce asphalt binder strain and subsequently increase Rutting Resistance, especially at high stress levels. Also, according to the results of the LAS test, adding PVC and EAFD powders to neat asphalt binder increase the fatigue Resistance of asphalt binder against micro-crackers at low strain levels. The results of experiments on asphalt mixtures showed that EAFD and PVC additives improve tensile strength, moisture susceptibility, and Rutting performance of asphalt mixtures. Overall, the results of this study illustrated that using EAFD and PVC waste materials in pavement industry, not only eliminate environmental problems caused by these materials and reduce the cost of stabilizing them, but also improve the technical performance of asphalt binders and mixtures.
Serji N Amirkhanian - One of the best experts on this subject based on the ideXlab platform.
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Rutting Resistance investigation of alternative polymerized asphalt mixtures
Journal of Materials in Civil Engineering, 2018Co-Authors: Feipeng Xiao, Serji N Amirkhanian, Jie YuanAbstract:AbstractPolymers have been incorporated into asphalt as a way to mitigate permanent deformation at high performance temperatures for many years. There are several types of polymers used in asphalt ...
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aggregate gradations on moisture and Rutting Resistances of open graded friction course mixtures
Construction and Building Materials, 2015Co-Authors: Feipeng Xiao, Serji N Amirkhanian, David HerndonAbstract:Abstract An open-graded friction course (OGFC), providing a higher degree of friction as well as permeability to the surface of the pavement, is a thin layer of permeable asphalt, which typically placed on top of traditional dense-graded asphalt pavement. The objective of this study was to investigate moisture and Rutting Resistance characteristics of one low Los Angeles (L.A.) Abrasion aggregate compared to three high L.A. Abrasion aggregates in terms of three gradations and two PG 76-22 binders. The main tested properties include moisture susceptibility (indirect tensile strength and tensile strength ratio) and the modified asphalt pavement analyzer (APA) rut depth. The test results indicated that aggregate gradation affected the moisture susceptibility and Rutting Resistance of OGFC mixtures. In addition, the moisture and Rutting Resistance of OGFC mixture could be evaluated by the common or modified test methods, but some new methods should be developed to properly evaluate these properties. Moreover, constructing test sections using alternate gradations while maintaining desired OGFC mixture properties is recommended.
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evaluation of Rutting Resistance in warm mix asphalts containing moist aggregate
Transportation Research Record, 2010Co-Authors: Feipeng Xiao, Serji N Amirkhanian, Bradley J PutmanAbstract:In recent years, rising energy prices and more stringent environmental regulations have resulted in an interest in warm-mix asphalt (WMA) technologies to decrease the energy consumption and emissions associated with conventional hot-mix asphalt production. In this study, the objective was to conduct a laboratory investigation of Rutting Resistance in WMA mixtures containing moist aggregates. Rut depth, weight loss, and gyration number of dry and conditioned specimens were measured for all of the mixtures. The experimental design included two aggregate moisture contents (0% and ~0.5% by weight of the dry mass of the aggregate), two lime contents (1% and 2% lime by weight of dry aggregate), three WMA additives (Aspha-min, Sasobit, and Evotherm), and three aggregate sources. Thirty-six mixtures were prepared, and 216 specimens were tested in this study. Test results indicated that the aggregate source significantly affects the Rutting Resistance regardless of the WMA additive, lime content, and moisture cont...
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Rutting Resistance of rubberized asphalt concrete pavements containing reclaimed asphalt pavement mixtures
Journal of Materials in Civil Engineering, 2007Co-Authors: Feipeng Xiao, Serji N Amirkhanian, Hsein C JuangAbstract:Improved understanding of Rutting Resistance of a rubberized asphalt concrete pavement that contains reclaimed asphalt pavement RAP is important to stimulating the use of rubberized asphalt mixtures. Use of RAP in the past has proved to be economical, environmentally sound, and effective in increasing the Rutting Resistance of asphalt mixtures. Rubberized asphalt has been used success- fully in improving the mechanical characteristics, such as Rutting Resistance, of typical hot mix asphalt HMA mixture around the country and the world. The objective of this research was to investigate the Rutting Resistance characteristics of the rubberized asphalt mixtures through a laboratory testing program. The experimental design included use of two rubber types ambient and cryogenically produced, four rubber contents, and three crumb rubber sizes. The results of the experiments indicated that the use of RAP and crumb rubber in the HMA can effectively improve the rut Resistance of these mixes.
