United States Department of Transportation
i
Literature review : performance of RAP/RAS mixes and new direction.
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2014-04-01
[PDF-5.62 MB]
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Abstract:In the last several years reclaimed asphalt pavement (RAP) and recycled asphalt shingles (RAS) have been
widely used in asphalt mixes in Texas. The use of RAP/RAS can significantly reduce the initial cost of
asphalt mixtures, conserve energy, and protect our environment. There are always two main concerns:
variability of RAP/RAS and durability (or cracking) of RAP/RAS mixes. Past studies in Texas have clearly
indicated that both RAP and RAS have acceptable variability following the best practices for handling
RAP/RAS. This study will focus on the durability of RAP/RAS mixes. This report presents a review of
using RAP/RAS in asphalt mixes, the identified research focus, and the revised field experimental test plan.
Specifically, this report discusses the field performance of RAP/RAS mixes in Texas and other states, and
the observed field performance data strongly support the necessity of establishing a RAP/RAS mix design
system for project-specific service conditions. The best practices for using RAP/RAS in hot-mix asphalt
(HMA) and warm mix asphalt (WMA) mixtures, including RAP/RAS processing, mix design, production,
and field construction, are also documented. Additionally, the new specification for asphalt mixes in Texas
is reviewed and then a revised field experimental test plan for validating the new specification is
recommended.
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