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More than 90 percent of highways and roads in the United States are built using hot-mix asphalt (HMA) or warm-mix asphalt (WMA) mixtures, and these mixtures now recycle more than 99 percent of some 76.2 million tons of reclaimed asphalt pavement (RAP) and about 1 million tons of recycled asphalt shingles (RAS) each year. Cost savings in 2017 totaled approximately $2.2 billion with these recycled materials replacing virgin materials.

The TRB National Cooperative Highway Research Program'sNCHRP Research Report 927: Evaluating the Effects of Recycling Agents on Asphalt Mixtures with High RAS and RAP Binder Ratios presents an evaluation of how commercially available recycling agents affect the performance of asphalt mixtures incorporating RAP and RAS at high recycled binder ratios.

A revised Appendix I (the draft AASHTO Standard Practice) replaces some of the material originally published in the report.

RESOURCES AT A GLANCE

Suggested Citation

National Academies of Sciences, Engineering, and Medicine. 2020. Evaluating the Effects of Recycling Agents on Asphalt Mixtures with High RAS and RAP Binder Ratios. Washington, DC: The National Academies Press. https://doi.org/10.17226/25749.

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Publication Info

282 pages |  8.5 x 11 |  Paperback
ISBN: 978-0-309-48104-5
DOI: https://doi.org/10.17226/25749

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