Although there is widespread use of reclaimed asphalt pavement (RAP), research performed under the Strategic Highway Research Program (SHRP) did not address the issues associated with use of RAP in hot-mix asphalt mixtures. Consequently, the Superpave system developed under SHRP did not provide guidelines to characterize asphalt binders extracted from RAP and recycled hot-mix asphalts. Because Superpave has gradually become the sole means for design and analysis of asphalt mixtures, research was needed to develop guidelines and procedures that will incorporate RAP in the Superpave system.
The objectives of this research were to (1) develop guidelines for incorporating RAP in the Superpave system and (2) prepare a manual that can be used by laboratory and field technicians.
The revised final report is made up of a technical report supported by seven appendices. It has been published as follows:
- NCHRP CD-ROM CRP-CD-44, "Recommended Use of Reclaimed Asphalt Pavement in the Superpave Mix Design Method," contains a 12-minute video presentation on the incorporation of RAP into hot mix asphalt designed with the Superpave method.
- The appendix titled "Summary: Guidelines for Incorporating Reclaimed Asphalt Pavement in the Superpave System" has been published as Research Results Digest 253.
- The appendix titled "Use of RAP In Superpave: Technicians' Manual" has been published as NCHRP Report 452 .
- The main report and the remaining appendices have been published as NCHRP Web Document 30.