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原文传递 Performance Investigation of Lab and Plant Foamed Recycled Asphalt Pavement Mixtures

题名：	Performance Investigation of Lab and Plant Foamed Recycled Asphalt Pavement Mixtures
正文语种：	中文
作者：	Feipeng Xiao Serji N.Amirkhanian Lijun Sun
作者单位：	Key Laboratory of Road and Traffic Engineering of the Ministry of Education,Tongji University, Shanghai, hina epartment of ivil, onstruction, and Environmental Engineering,University of labama, Tuscaloosa, L, US
关键词：	Foaming RAP Mix Design ITS Rutting Fatigue
摘要：	The producing process of asphalt mixture in an asphalt plant generally averagely emits over 20 tons of emission each year in United States.Therefore, it is very necessary to reduce the emissions from asphalt plants.The foaming process generally produces tiny steam bubbles inside the asphalt binder, leading to increased wettability of the binder and lower high shear viscosities, and thus significantly reduces the emission.In addition, the recycling of existing asphalt pavement materials produces new pavements with considerable savings in material, money, and energy, proving to be both economical and effective in protecting the environment.The objective of this study is to explore the performance characteristics of laboratory and plant foamed mixtures containing a certain content of recycled asphalt pavement (RAP).The used materials were approved by South Carolina Department of Transportation (SCDOT).In this study,six RAP concentrations (0#, 20#, and 30# from lab and 10#, 15# and 25# from plant) from four sources were employed.Some rheological tests including viscosity and performance grade values of asphalt binders at virgin and rolling thin film oven aged states as well as extracted state were performed.In addition, performance tests such as compaction effort, indirect tensile strength, rutting resistance, resilient modulus, and fatigue were completed to investigate the influence of foaming technology and RAP concentration on laboratory and asphalt plant.The test results illustrated that, as expected, a higher RAP content resulted in a higher viscosity and achieved higher mixing and compaction temperatures.Additionally, a higher failure temperature and a lower phase angle could be found when used a greater percentage of RAP.The mix design results indicated that laboratory foamed mixture had a lower optimum asphalt binder content compared to plant mix design (without foaming technology).However, the plant foamed mixtures had relatively higher ITS and fatigue values, lower rut depths and resilient modulus values in general; most were RAP source dependent.Moreover, it was found that the foaming technology was working very well to produce the mixtures in the lab and plant, which satisfied the requirements of all mix types set by SCDOT.
会议日期：	20150422
会议举办地点：	上海
会议名称：	第七届中国公路科技创新高层论坛
出版日期：	2015-04-22
母体文献：	第七届中国公路科技创新高层论坛论文集