Evaluating the Effects of Recycling Agents on Asphalt Mixtures with High RAS and RAP Binder Ratios
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's
NCHRP 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.
This Summary Last Modified On: 3/2/2021