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Serji N. Amirkhanian
Department of Civil, Construction and Environmental Engineering, The University of Alabama, 400 McCorvey Dr., 135 BB Comer, Tuscaloosa, AL 35487, USA

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Review article
Published: 27 February 2021 in Resources, Conservation and Recycling
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The management of scrap tires became a great concern nowadays. Crumb rubber (CR) derived from the grinding of scrap tires has successfully been used as modifier for the paving asphalt towards sustainability, and the end product was generally known as rubberized asphalt. Although rubberized asphalt was considered as a green paving material with favorable engineering benefits, it suffered from poor compatibility that severely limited its application. This incompatibility issue was essentially caused by the great differences in chemical nature (molecular size and polarity) and physical features (density and solubility) between CR and asphalt matrix. One solution to this problem was the surface activation of CR, which aimed to modify the chemical and/or physical characteristics of the CR surface. By far, the practical surface activation methods mainly included pre-reaction, oxidization, grafting, polymer coating, and solution soaking as chemical methods as well as plasma treatment and gamma radiation as physical methods. Meanwhile, concerning the limitations of present technologies, recommendations for future studies focusing on this issue were provided.

ACS Style

Jin Li; Zixuan Chen; Feipeng Xiao; Serji N. Amirkhanian. Surface activation of scrap tire crumb rubber to improve compatibility of rubberized asphalt. Resources, Conservation and Recycling 2021, 169, 105518 .

AMA Style

Jin Li, Zixuan Chen, Feipeng Xiao, Serji N. Amirkhanian. Surface activation of scrap tire crumb rubber to improve compatibility of rubberized asphalt. Resources, Conservation and Recycling. 2021; 169 ():105518.

Chicago/Turabian Style

Jin Li; Zixuan Chen; Feipeng Xiao; Serji N. Amirkhanian. 2021. "Surface activation of scrap tire crumb rubber to improve compatibility of rubberized asphalt." Resources, Conservation and Recycling 169, no. : 105518.

Journal article
Published: 25 September 2020 in Journal of Cleaner Production
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The combined utilization of Recycled Asphalt Pavement (RAP) and natural sand as alternative aggregates was attractive for potential environmental and economic benefits. The dynamic and rutting performances of recycled asphalt mixtures containing natural sand and Anti-stripping Agents (ASAs) were investigated in this study. Two mixture types (Surface Type B with Ndesign of 75 and Surface Type C with Ndesign of 50), two aggregate sources (designated as J and L), and three ASA types (designated as A0, A1, and A2) were designed. In addition, 23% and 27% RAP was respectively selected for Surface Type B and C mixtures, and 20% natural sand was designed for all the mixtures. The results indicated the Surface Type B mixtures generally had higher dynamic modulus and lower phase angle than the Surface Type C mixtures. Mixtures prepared by aggregate J had greater engineering performance than aggregate L. The effect of ASA type was insignificant on these mixtures made by aggregate J, while the liquid ASAs were more effective than hydrated lime for those fabricated by aggregate L. In terms of rutting resistance, the findings from APA tests agreed with HWT tests in most cases, indicating the limited use of RAP and natural sand was proved to be satisfactory. In addition, the use of ASAs was highly effective to prevent the recycled mixtures from moisture damage. Finally, the dynamic modulus at 37.8°C and 54.4°C used a loading frequency of 5 Hz statistically correlated with the APA and HWT rut depth.

ACS Style

Jin Li; Feipeng Xiao; Serji N. Amirkhanian; Ouming Xu. Dynamic and rutting characteristics of recycled asphalt mixtures containing natural sand and anti-stripping agents. Journal of Cleaner Production 2020, 280, 124365 .

AMA Style

Jin Li, Feipeng Xiao, Serji N. Amirkhanian, Ouming Xu. Dynamic and rutting characteristics of recycled asphalt mixtures containing natural sand and anti-stripping agents. Journal of Cleaner Production. 2020; 280 ():124365.

Chicago/Turabian Style

Jin Li; Feipeng Xiao; Serji N. Amirkhanian; Ouming Xu. 2020. "Dynamic and rutting characteristics of recycled asphalt mixtures containing natural sand and anti-stripping agents." Journal of Cleaner Production 280, no. : 124365.

Journal article
Published: 19 November 2019 in Construction and Building Materials
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This study investigated the effect of cold plasma surface treatment of crumb rubber on the high temperature performances of CRM binders at unaged and RTFO-aged states, which were produced with two base asphalts and three crumb rubber sizes. The high temperature performance tests conducted on the rubberized binders included rotational viscosity, failure temperature, rutting factor, phase angle, storage modulus, and loss modulus at different temperatures. According to the result of performance tests and statistical analyses, cold plasma surface treatment on crumb rubber significantly enhanced the high temperature performances of CRM binders, regardless of base asphalt source, crumb rubber size and aging state. The effect of base asphalt source was mainly reflected in determining the high temperature performances of RTFO-aged binders. With respect to the crumb rubber size, the -40 mesh plasma-treated CRM binders were the most desirable. In addition, the RTFO aging caused an enhancement in elasticity and viscosity of plasma-treated CRM binders as expected. Finally, the Gray Relational Analysis (GRA) determined the coupling effect of these variables, indicating that cold plasma surface treatment of -40 mesh crumb rubber and base asphalt A was the most effective combination in terms of high temperature rheological properties of CRM binders.

ACS Style

Jin Li; Feipeng Xiao; Serji Amirkhanian. High temperature rheological characteristics of plasma-treated crumb rubber modified binders. Construction and Building Materials 2019, 236, 117614 .

AMA Style

Jin Li, Feipeng Xiao, Serji Amirkhanian. High temperature rheological characteristics of plasma-treated crumb rubber modified binders. Construction and Building Materials. 2019; 236 ():117614.

Chicago/Turabian Style

Jin Li; Feipeng Xiao; Serji Amirkhanian. 2019. "High temperature rheological characteristics of plasma-treated crumb rubber modified binders." Construction and Building Materials 236, no. : 117614.

Case report
Published: 17 August 2019 in Case Studies in Construction Materials
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Crumb rubber modifier (CRM) is one of the most popular asphalt binder modifiers due to the economic benefits and desired physical and rheological properties of asphalt binders and asphalt mixes. This research focuses on evaluating the properties of rubber-modified asphalt binders and selecting the best modified binder. The modified binders were produced by blending virgin binders with CRM at various contents of different gradations, and different methods of grinding. CRM made through ambient and cryogenic grinding methods with two gradation sizes were produced and tested. Three different virgin binders from two sources were obtained and used. The Analytic Hierarchy Process (AHP) method was used to determine the best combination of virgin binder and CRM, based on the rheological properties and their importance in Nevada’s construction code. Based on AHP analysis, ambient CRM obtained the highest priority. CRM contents of 10% and 15% were ranked higher than 20% depending on the grade of the virgin binder. Both mesh 20 and 40 CRM sizes were favorable.

ACS Style

Mehdi Khalili; Kazem Jadidi; Moses Karakouzian; Serji Amirkhanian. Rheological properties of modified crumb rubber asphalt binder and selecting the best modified binder using AHP method. Case Studies in Construction Materials 2019, 11, e00276 .

AMA Style

Mehdi Khalili, Kazem Jadidi, Moses Karakouzian, Serji Amirkhanian. Rheological properties of modified crumb rubber asphalt binder and selecting the best modified binder using AHP method. Case Studies in Construction Materials. 2019; 11 ():e00276.

Chicago/Turabian Style

Mehdi Khalili; Kazem Jadidi; Moses Karakouzian; Serji Amirkhanian. 2019. "Rheological properties of modified crumb rubber asphalt binder and selecting the best modified binder using AHP method." Case Studies in Construction Materials 11, no. : e00276.

Review
Published: 07 June 2019 in Journal of Cleaner Production
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Highway pavement construction with recycled solid waste materials had become a sustainable topic of great concern recently, due to the potential environmental and economic benefits behind. This review focused on the emerging Life Cycle Assessment (LCA) and Life Cycle Cost Analysis (LCCA) studies concerning the recycling of solid waste in highway pavement. Firstly, based on the existing studies, the application of most recycled solid waste materials (e.g. recycled asphalt pavement, steel slag and coal fly ash) in highway pavement performed satisfactorily from the environmental and economic perspectives, concretely manifested in the reduction of energy consumption, greenhouse gas emissions, costs and other indicators. However, several factors, such as lengthened transport distance of recycled waste solid materials and potential leaching of heavy metals, might hinder the recycling. Moreover, it was necessary to pay more attention to pavement use phase, allocation procedure and transport distance of recycled solid waste materials, which had significant impacts on LCA result. In terms of existing LCCAs, the importance of analysis period and discount rate was highlighted and the most practical economic indicator was Net Present Value (NPV). For future study, allocation was still an important issue for future LCA studies and further sensitivity analyses could focus on the selection of transport modes (in LCA), analysis periods and discount rates (in LCCA). Meanwhile, future research should emphasis on the recycling of solid waste in pavement maintenance and rehabilitation projects rather than new construction. A multi-criteria assessment integrated LCA and LCCA as well as other considerations (e.g. an advanced risk assessment) was recommended to determine the most sustainable recycling scenarios.

ACS Style

Jin Li; Feipeng Xiao; Lanfang Zhang; Serji N. Amirkhanian. Life cycle assessment and life cycle cost analysis of recycled solid waste materials in highway pavement: A review. Journal of Cleaner Production 2019, 233, 1182 -1206.

AMA Style

Jin Li, Feipeng Xiao, Lanfang Zhang, Serji N. Amirkhanian. Life cycle assessment and life cycle cost analysis of recycled solid waste materials in highway pavement: A review. Journal of Cleaner Production. 2019; 233 ():1182-1206.

Chicago/Turabian Style

Jin Li; Feipeng Xiao; Lanfang Zhang; Serji N. Amirkhanian. 2019. "Life cycle assessment and life cycle cost analysis of recycled solid waste materials in highway pavement: A review." Journal of Cleaner Production 233, no. : 1182-1206.

Editorial
Published: 03 April 2019 in Materials
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This special issue, "Environment-Friendly Construction Materials", has been proposed and organized as a means to present recent developments in the field of construction materials. For this reason, the articles highlighted in this editorial relate to different aspects of construction materials, from pavement materials to building materials, from material design to structural design, from self-healing to cold recycling, from asphalt mixture to cement concrete.

ACS Style

Shaopeng Wu; Inge Hoff; Serji Amirkhanian; Yue Xiao. Special Issue of Environment-Friendly Construction Materials. Materials 2019, 12, 1101 .

AMA Style

Shaopeng Wu, Inge Hoff, Serji Amirkhanian, Yue Xiao. Special Issue of Environment-Friendly Construction Materials. Materials. 2019; 12 (7):1101.

Chicago/Turabian Style

Shaopeng Wu; Inge Hoff; Serji Amirkhanian; Yue Xiao. 2019. "Special Issue of Environment-Friendly Construction Materials." Materials 12, no. 7: 1101.

Journal article
Published: 16 March 2019 in Construction and Building Materials
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Crumb rubber modified (CRM) asphalt has been increasingly used in highway and airfield pavements due to its great mechanical behavior. However, the poor storage stability limits its application. It has been proved that plasma technology can effectively improve the surface characteristics of polymer. Therefore, this study introduced low temperature plasma (LTP) to modify the surface of crumb rubber for improving its adhesion. In this study, a series of laboratory tests, including hot storage test, linear amplitude sweep (LAS) test and bending beam rheometer (BBR) test, were carried out. Then storage stability, fatigue resistance and low temperature rheological property of LTP treated and untreated CRM binders were explored to evaluate the impact of LTP treatment, rubber content, particle size and binder source. The results indicated that the LTP treated rubberized binders showed enhanced storage stability (except for 20% content) and fatigue property, while its low temperature performance had a slight change. Moreover, the increased rubber content from 10% to 20% had a positive effect on aforementioned properties after LTP treatment. Specially, the critical low temperature tended to increase linearly as CR content increased within the scope of 10–20%. In addition, the fatigue performance increased with a great rubber particle size while the storage stability was on the contrast. Furthermore, after a LTP treatment, the softer crumb rubberized binder showed improved low temperature performance and weakened fatigue resistance.

ACS Style

Jin Li; Feipeng Xiao; Serji N. Amirkhanian. Storage, fatigue and low temperature characteristics of plasma treated rubberized binders. Construction and Building Materials 2019, 209, 454 -462.

AMA Style

Jin Li, Feipeng Xiao, Serji N. Amirkhanian. Storage, fatigue and low temperature characteristics of plasma treated rubberized binders. Construction and Building Materials. 2019; 209 ():454-462.

Chicago/Turabian Style

Jin Li; Feipeng Xiao; Serji N. Amirkhanian. 2019. "Storage, fatigue and low temperature characteristics of plasma treated rubberized binders." Construction and Building Materials 209, no. : 454-462.

Journal article
Published: 01 October 2018 in Journal of Materials in Civil Engineering
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This work evaluated the effect of polymer and polyphosphoric acid (PPA) on the aging resistance of different asphalt binders with pressure-aging-vessel (PAV) aging. Two base asphalt binders, three polymers, one recycled crumb rubber, and one PPA were used to produce the modified binders. The tested aging resistance included failure temperature, fatigue factor (G*·sinδ), phase angle by dynamic-shear-rheometer (DSR) testing, stiffness (S), and creep rate (m-value) by beam-bending-rheometer (BBR) testing. The G*·sinδ values of the modified binders produced by 2% oxidized polyethylene or propylene–maleic anhydride and 0.5% PPA are lower than that of the modified binders produced by 3% oxidized polyethylene or propylene–maleic anhydride. Similarly, the modified binders produced by 2% styrene butadiene styrene (SBS) and rubber and 0.5% PPA show a lower fatigue factor value than those produced by 3% SBS and rubber. The asphalt binders blended with 0.5% PPA show lower phase-angle values than those produced by 3% oxidized polyethylene, propylene–maleic anhydride, or SBS. Moreover, the phase-angle value of the modified binder containing 2% SBS and 0.5% PPA is the lowest. The low-temperature stiffness and failure of modified asphalt with PPA is reduced to 23, 18, and 20°C. Compared with the polymer-modified asphalt, the difference between the stiffness of modified-asphalt binder with PPA at the test temperature of −18°C decreased by 16.67, 25, 4.17, and 4.17%, respectively. The results showed that using 0.5% PPA as 1.0% polymer replacement has a positive influence on the aging properties of binders. Moreover, the polymers, PPA, and binder sources can obviously influence the fatigue resistance of the binders.

ACS Style

XiaoMing Liu; Fengjie Cao; Feipeng Xiao; Serji Amirkhanian. BBR and DSR Testing of Aging Properties of Polymer and Polyphosphoric Acid–Modified Asphalt Binders. Journal of Materials in Civil Engineering 2018, 30, 04018249 .

AMA Style

XiaoMing Liu, Fengjie Cao, Feipeng Xiao, Serji Amirkhanian. BBR and DSR Testing of Aging Properties of Polymer and Polyphosphoric Acid–Modified Asphalt Binders. Journal of Materials in Civil Engineering. 2018; 30 (10):04018249.

Chicago/Turabian Style

XiaoMing Liu; Fengjie Cao; Feipeng Xiao; Serji Amirkhanian. 2018. "BBR and DSR Testing of Aging Properties of Polymer and Polyphosphoric Acid–Modified Asphalt Binders." Journal of Materials in Civil Engineering 30, no. 10: 04018249.

Journal article
Published: 01 October 2017 in Construction and Building Materials
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ACS Style

Ningyi Su; Feipeng Xiao; Jingang Wang; Serji Amirkhanian. Characterizations of base and subbase layers for Mechanistic-Empirical Pavement Design. Construction and Building Materials 2017, 152, 731 -745.

AMA Style

Ningyi Su, Feipeng Xiao, Jingang Wang, Serji Amirkhanian. Characterizations of base and subbase layers for Mechanistic-Empirical Pavement Design. Construction and Building Materials. 2017; 152 ():731-745.

Chicago/Turabian Style

Ningyi Su; Feipeng Xiao; Jingang Wang; Serji Amirkhanian. 2017. "Characterizations of base and subbase layers for Mechanistic-Empirical Pavement Design." Construction and Building Materials 152, no. : 731-745.

Journal article
Published: 01 October 2017 in Construction and Building Materials
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ACS Style

Jiasheng Li; Jianying Yu; Shaopeng Wu; Ling Pang; Serji Amirkhanian; Meiling Zhao. Effect of inorganic ultraviolet resistance nanomaterials on the physical and rheological properties of bitumen. Construction and Building Materials 2017, 152, 832 -838.

AMA Style

Jiasheng Li, Jianying Yu, Shaopeng Wu, Ling Pang, Serji Amirkhanian, Meiling Zhao. Effect of inorganic ultraviolet resistance nanomaterials on the physical and rheological properties of bitumen. Construction and Building Materials. 2017; 152 ():832-838.

Chicago/Turabian Style

Jiasheng Li; Jianying Yu; Shaopeng Wu; Ling Pang; Serji Amirkhanian; Meiling Zhao. 2017. "Effect of inorganic ultraviolet resistance nanomaterials on the physical and rheological properties of bitumen." Construction and Building Materials 152, no. : 832-838.

Journal article
Published: 01 October 2017 in Construction and Building Materials
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ACS Style

Jiayu Wang; Feipeng Xiao; Zheng Chen; Xinghai Li; Serji Amirkhanian. Application of tack coat in pavement engineering. Construction and Building Materials 2017, 152, 856 -871.

AMA Style

Jiayu Wang, Feipeng Xiao, Zheng Chen, Xinghai Li, Serji Amirkhanian. Application of tack coat in pavement engineering. Construction and Building Materials. 2017; 152 ():856-871.

Chicago/Turabian Style

Jiayu Wang; Feipeng Xiao; Zheng Chen; Xinghai Li; Serji Amirkhanian. 2017. "Application of tack coat in pavement engineering." Construction and Building Materials 152, no. : 856-871.

Journal article
Published: 01 August 2017 in Construction and Building Materials
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ACS Style

Liping Li; Shaopeng Wu; Gang Liu; Tingwei Cao; Serji Amirkhanian. Effect of organo-montmorillonite nanoclay on VOCs inhibition of bitumen. Construction and Building Materials 2017, 146, 429 -435.

AMA Style

Liping Li, Shaopeng Wu, Gang Liu, Tingwei Cao, Serji Amirkhanian. Effect of organo-montmorillonite nanoclay on VOCs inhibition of bitumen. Construction and Building Materials. 2017; 146 ():429-435.

Chicago/Turabian Style

Liping Li; Shaopeng Wu; Gang Liu; Tingwei Cao; Serji Amirkhanian. 2017. "Effect of organo-montmorillonite nanoclay on VOCs inhibition of bitumen." Construction and Building Materials 146, no. : 429-435.

Journal article
Published: 01 August 2017 in Construction and Building Materials
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ACS Style

Feipeng Xiao; Siyuan Xu; Xiangdao Hou; Serji Amirkhanian. Low temperature grade determinations of asphalt mortar without extraction before and after one year storage duration. Construction and Building Materials 2017, 146, 475 -484.

AMA Style

Feipeng Xiao, Siyuan Xu, Xiangdao Hou, Serji Amirkhanian. Low temperature grade determinations of asphalt mortar without extraction before and after one year storage duration. Construction and Building Materials. 2017; 146 ():475-484.

Chicago/Turabian Style

Feipeng Xiao; Siyuan Xu; Xiangdao Hou; Serji Amirkhanian. 2017. "Low temperature grade determinations of asphalt mortar without extraction before and after one year storage duration." Construction and Building Materials 146, no. : 475-484.

Review
Published: 01 August 2017 in Construction and Building Materials
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ACS Style

Tao Wang; Feipeng Xiao; Serji Amirkhanian; Weidong Huang; Mulian Zheng. A review on low temperature performances of rubberized asphalt materials. Construction and Building Materials 2017, 145, 483 -505.

AMA Style

Tao Wang, Feipeng Xiao, Serji Amirkhanian, Weidong Huang, Mulian Zheng. A review on low temperature performances of rubberized asphalt materials. Construction and Building Materials. 2017; 145 ():483-505.

Chicago/Turabian Style

Tao Wang; Feipeng Xiao; Serji Amirkhanian; Weidong Huang; Mulian Zheng. 2017. "A review on low temperature performances of rubberized asphalt materials." Construction and Building Materials 145, no. : 483-505.

Journal article
Published: 07 July 2017 in Applied Sciences
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Graphene oxide (GO) has a unique layered structure with excellent gas and liquid blocking properties. It is widely used in many areas, such as gas sensors, carbon-based electronics, impermeable membranes, and polymeric composite materials. In order to evaluate whether GO (1% and 3% by weight of asphalt) can improve the aging resistance performance of the asphalt, 80/100 penetration grade asphalt (90 A) and styrene–butadiene–styrene modified asphalt (SBS MA) were used to prepare the GO modified asphalt by the melt blending method. The surface morphology of the GO was analyzed by scanning electron microscope (SEM). The UV aging test was conducted to simulate the aging during the service period. After UV aging test, the physical performances of GO-modified asphalts were tested, and the IC=O and IS=O increments were tested by Fourier transform infrared spectroscopy (FTIR) to evaluate the aging resistance performance of the GO modified asphalt. In addition, the rheological properties of GO modified asphalts were studied using a dynamic shear rheometer (DSR). The SEM analysis indicated that the GO exhibits many shared edges, and no agglomeration phenomenon was found. With respect to the physical performance test, the FTIR and the DSR results show that GO can improve the UV aging resistance performance of 90 A and SBS MA. In addition, the analysis indicated that the improvement effect of 3% GO is better than the 1% GO. The testing on the rheological properties of the modified asphalt indicated that the GO can also improve the thermo-oxidative aging resistance performance of asphalt.

ACS Style

Shaopeng Wu; Zhijie Zhao; Yuanyuan Li; Ling Pang; Serji Amirkhanian; Martin Riara. Evaluation of Aging Resistance of Graphene Oxide Modified Asphalt. Applied Sciences 2017, 7, 702 .

AMA Style

Shaopeng Wu, Zhijie Zhao, Yuanyuan Li, Ling Pang, Serji Amirkhanian, Martin Riara. Evaluation of Aging Resistance of Graphene Oxide Modified Asphalt. Applied Sciences. 2017; 7 (7):702.

Chicago/Turabian Style

Shaopeng Wu; Zhijie Zhao; Yuanyuan Li; Ling Pang; Serji Amirkhanian; Martin Riara. 2017. "Evaluation of Aging Resistance of Graphene Oxide Modified Asphalt." Applied Sciences 7, no. 7: 702.

Journal article
Published: 01 July 2017 in Construction and Building Materials
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ACS Style

Lingqing Liu; Feipeng Xiao; Henglong Zhang; Serji Amirkhanian. Rheological characteristics of alternative modified binders. Construction and Building Materials 2017, 144, 442 -450.

AMA Style

Lingqing Liu, Feipeng Xiao, Henglong Zhang, Serji Amirkhanian. Rheological characteristics of alternative modified binders. Construction and Building Materials. 2017; 144 ():442-450.

Chicago/Turabian Style

Lingqing Liu; Feipeng Xiao; Henglong Zhang; Serji Amirkhanian. 2017. "Rheological characteristics of alternative modified binders." Construction and Building Materials 144, no. : 442-450.

Review
Published: 01 July 2017 in Construction and Building Materials
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ACS Style

Ruoyu Li; Feipeng Xiao; Serji Amirkhanian; Zhanping You; Jia Huang. Developments of nano materials and technologies on asphalt materials – A review. Construction and Building Materials 2017, 143, 633 -648.

AMA Style

Ruoyu Li, Feipeng Xiao, Serji Amirkhanian, Zhanping You, Jia Huang. Developments of nano materials and technologies on asphalt materials – A review. Construction and Building Materials. 2017; 143 ():633-648.

Chicago/Turabian Style

Ruoyu Li; Feipeng Xiao; Serji Amirkhanian; Zhanping You; Jia Huang. 2017. "Developments of nano materials and technologies on asphalt materials – A review." Construction and Building Materials 143, no. : 633-648.

Review
Published: 01 July 2017 in Construction and Building Materials
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Warm mix asphalt (WMA) has been widely used as an environmentally friendly technology. Due to the lower temperature than hot mix asphalt (HMA) and some influences of warm mix technologies, moisture damage is considered as one of the main concerns for WMA mixtures. This review focuses on the influences of various factors on the moisture susceptibility of WMA mixtures. The commonly used test methods are briefly introduced, while tensile strength ratio (TSR) test is the most commonly used method to evaluate the moisture susceptibility. Then the influence of materials and technologies are illustrated. Materials, aggregate and asphalt, play important roles in the moisture characteristics of mixtures. Compacting temperature and other warm mix technologies also significantly influence the moisture characteristics. The purpose of this review is to provide assistance to the project engineer when WMA technologies are employed. (C) 2017 Elsevier Ltd. All rights reserved

ACS Style

Siyuan Xu; Feipeng Xiao; Serji Amirkhanian; Dharamveer Singh. Moisture characteristics of mixtures with warm mix asphalt technologies – A review. Construction and Building Materials 2017, 142, 148 -161.

AMA Style

Siyuan Xu, Feipeng Xiao, Serji Amirkhanian, Dharamveer Singh. Moisture characteristics of mixtures with warm mix asphalt technologies – A review. Construction and Building Materials. 2017; 142 ():148-161.

Chicago/Turabian Style

Siyuan Xu; Feipeng Xiao; Serji Amirkhanian; Dharamveer Singh. 2017. "Moisture characteristics of mixtures with warm mix asphalt technologies – A review." Construction and Building Materials 142, no. : 148-161.

Journal article
Published: 06 May 2017 in Materials
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Waste cooking oil (WCO), in many cases, can rejuvenate aged asphalt and restore its properties. However, the influence of WCO qualities on rejuvenation behaviors of aged asphalt has not been investigated in detail. The objective of this paper was to evaluate the effects of WCO viscosity and acid value on the basic, rheological, and chemical properties of a typical rejuvenated asphalt. Penetration, ring and ball (R and B) softening point, and ductility were tested to evaluate the influence of WCO qualities on basic properties of rejuvenated asphalts. Then, the rheological properties of rejuvenated asphalt were characterized based on rotational viscometer (RV), dynamic shear rheometer (DSR), and bending beam rheometer (BBR) test results. Further, SARA (saturates, aromatics, resins, and asphaltenes) fraction analysis and Fourier transform infrared spectroscopy (FTIR) tests were performed to investigate the effects of WCO qualities on asphalt chemical composition. Finally, grey correlation coefficients were calculated and the relationships between WCO qualities and rejuvenated asphalt properties were quantitatively evaluated. The experimental results indicated that WCO qualities influence the rejuvenation behaviors of aged asphalt significantly, and the WCO with higher qualities (low acid value and viscosity, as defined in this research) tends to achieve better rejuvenation effects. Based on the results of grey correlation analyses, the acid value is, relatively, a better indicator than viscosity in predicting the rejuvenation efficiency of WCO. The rejuvenation thresholds of WCO are varied with the categories of properties of rejuvenated asphalts, and WCO with an acid value of 0.4–0.7 mg KOH/g, or a viscosity of 140–540 mm2/s, can meet all of the performance requirements for asphalt rejuvenation used in this research.

ACS Style

Dong Zhang; Meizhu Chen; Shaopeng Wu; Jingxiang Liu; Serji Amirkhanian. Analysis of the Relationships between Waste Cooking Oil Qualities and Rejuvenated Asphalt Properties. Materials 2017, 10, 508 .

AMA Style

Dong Zhang, Meizhu Chen, Shaopeng Wu, Jingxiang Liu, Serji Amirkhanian. Analysis of the Relationships between Waste Cooking Oil Qualities and Rejuvenated Asphalt Properties. Materials. 2017; 10 (5):508.

Chicago/Turabian Style

Dong Zhang; Meizhu Chen; Shaopeng Wu; Jingxiang Liu; Serji Amirkhanian. 2017. "Analysis of the Relationships between Waste Cooking Oil Qualities and Rejuvenated Asphalt Properties." Materials 10, no. 5: 508.

Journal article
Published: 20 March 2017 in Applied Sciences
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Reclaimed asphalt pavement (RAP) has many advantages and is utilized to improve the high temperature properties of asphalt mixtures. Low temperature cracking is a predominant distress in asphalt pavements containing RAP materials. Thus, the evaluation of fracture resistance for asphalt mixtures containing RAP is of interest. The objective of this research is to explore the low temperature performance characteristics of RAP mortars containing sieved RAP and soft binders at three aged states. The stiffness values and m-values from bending beam rheometer (BBR) tests at three test temperatures of −18 °C, −12 °C and −6 °C were obtained to conduct the minimum low temperature grades. RAP mortar with a higher aged binder content had a higher minimum low temperature regardless of RAP source. In addition, RAP mortars with virgin soft binder had the best low temperature resistance followed by the RAP mortars with rolling thin film oven (RTFO) and pressure-aged vessel (PAV) binders.

ACS Style

Feipeng Xiao; Ruoyu Li; Henglong Zhang; Serji Amirkhanian. Low Temperature Performance Characteristics of Reclaimed Asphalt Pavement (RAP) Mortars with Virgin and Aged Soft Binders. Applied Sciences 2017, 7, 304 .

AMA Style

Feipeng Xiao, Ruoyu Li, Henglong Zhang, Serji Amirkhanian. Low Temperature Performance Characteristics of Reclaimed Asphalt Pavement (RAP) Mortars with Virgin and Aged Soft Binders. Applied Sciences. 2017; 7 (3):304.

Chicago/Turabian Style

Feipeng Xiao; Ruoyu Li; Henglong Zhang; Serji Amirkhanian. 2017. "Low Temperature Performance Characteristics of Reclaimed Asphalt Pavement (RAP) Mortars with Virgin and Aged Soft Binders." Applied Sciences 7, no. 3: 304.