Evaluating the Effects of Recycling Agents on Asphalt Mixtures with High RAS and RAP Binder Ratios (2020) / Chapter Skim
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1 More than 90% of highways and roads in the United States are built using hot-mix asphalt (HMA) or warm-mix asphalt (WMA)
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2 Evaluating the Effects of Recycling Agents on Asphalt Mixtures with High RAS and RAP Binder Ratios Many materials combinations were used; these included 10 base binders, 6 RAP sources, 5 RAS sources, 5 aggregate types, and 10 recycling agents. Laboratory testing results and field performance at five field projects in Texas, Indiana, Nevada, Wisconsin, and Delaware facilitated engineering rejuvenated binder blends and corresponding mixtures and the development of evaluation tools for assessing the effectiveness of recycling agents initially and with aging for binders and mixtures with high RBRs.
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Summary 3 • Assessment of the effects of moisture susceptibility for mixtures with high RBRs and recycling agents and possible addition of another performance threshold, • Rheological evaluation of modified binders to determine how to capture their benefits when used in mixtures with high RBRs and recycling agents, and • Chemical assessment of recycling agents to revise specifications for these component materials.
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