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.
Table of Contents
|Chapter 1 - Introduction||4-35|
|Chapter 2 - Key Results from Phase 2||36-70|
|Chapter 3 - Field and Laboratory Performance of High RBR Mixtures||71-78|
|Chapter 4 - Expanded Laboratory Performance of High RBR Binder Blends and Mixtures||79-126|
|Chapter 5 - Practical Tools for Evaluation of High RBR Binder Blends and Mixtures||127-144|
|Chapter 6 - Summary and Path Forward||145-150|
|Abbreviations and Symbols||157-160|
|Appendix A - Texas Construction Report||161-176|
|Appendix B - Nevada Construction Report||177-186|
|Appendix C - Indiana Construction Report||187-200|
|Appendix D - Wisconsin Construction Report||201-220|
|Appendix E - Delaware Construction Report||221-236|
|Appendix F - Binder Blend Aging Prediction Data||237-240|
|Appendix G - Recycling Agent Characterization Data||241-252|
|Appendix H - Economics Associated with the Use of Recycling Agents||253-260|
|Appendix I - Draft AASHTO Standard Practice||261-274|
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