United States Department of Transportation
i
0-6738: Performance Studies and Future Directions for Mixes Containing RAP and RAS
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2015-01-01
[PDF-369.63 KB]
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Alternative Title:Performance Studies and Future Directions for Mixes Containing RAP and RAS
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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. However, 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 focused on the durability problems of RAP/RAS asphalt mixes. Specifically, the major objectives of this study were to: 1. Evaluate the impact of RAP/RAS used in hot-mix asphalt and warm-mix asphalt (WMA) on durability/performance problems of the mixes through laboratory evaluation and field survey. 2. Evaluate the impacts of RAP/RAS mixes’ performance and identify approaches for improving the durability problems in terms of mix design. 3. Investigate the cost-benefit ratio of RAP/RAS mixes.
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