United States Department of Transportation
i
Preliminary investigation of RAP and RAS in HMAC : final report, February 2010.
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2010-02-01
[PDF-983.40 KB]
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Alternative Title:Preliminary investigation of reclaimed asphalt pavement and reclaimed asphalt shingles in hot mixed asphalt concrete
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Edition:Final report.
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Abstract:A laboratory study was undertaken to investigate how various proportions of reclaimed asphalt pavement (RAP) and reclaimed asphalt shingles (RAS) added to hot mixed asphalt concrete (HMAC) mixtures affect the Superpave performance grade of the blended binder. Only tear-off shingles (those obtained from re-roofing projects of residential structures) were included in the study. Critical temperatures of the blended asphalt binders from mixtures with 5% RAS and 0% to 50% RAP were compared with the critical temperatures of the virgin binder. Results indicated that the mixture with 5% RAS but no RAP resulted in an increase of the performance grade of the blended binder. Binders recovered from the mixtures with both RAP and RAS indicated an increase in both the high temperature and low temperature performance grades of the blended binder with increasing RAP contents up to about 30%. RAP contents above 30% did not result in any further increases in the low temperature performance grade and only slightly impacted the high temperature performance grade of the blended binders (the high temperature performance grade of the blended binder asymptotically approached that of the high temperature performance grade of the RAP binder).
A secondary objective was to develop recommendations for changes to the mix design method and specifications for HMAC, incorporating RAS and RAP for use in special provisions for a pilot study. Specifications and special provisions of several agencies that allow tear-off RAS, and particularly those that allow tear-off RAS and RAP together, were reviewed to determine restrictions, criteria, test methods, mix design procedures, etc. applicable to inclusion of RAS and RAP in HMAC paving mixtures. Proposed modifications to ODOT specification SP745 were developed from this review.
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