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Improved Performance of Reclaimed Asphalt Pavement Mixes
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    Utilization of RAP in asphalt pavements has become an important strategy to help offset rising raw material prices and to improve the sustainability of our transportation infrastructure. The South Dakota DOT began to routinely use RAP in main‐line asphalt surfaces in 2007. However, some of these pavements have not performed satisfactory, often exhibiting premature raveling and cracking. This prompted the SDDOT to commission this study to identify current practices and specifications that could be improved. The research team reviewed the department’s current policies, specification, and procedures as well as the current state of knowledge related to RAP use from recent research and neighboring highway departments. The researchers also reviewed mix design and quality assurance data from a few of the poor performing projects. The research team found that most of SDDOT’s current practices regarding RAP use are appropriate, but made several recommendations to better characterize RAP materials during mix design and to verify those characteristics during mixture production. To improve the performance and durability of the mixes containing RAP, a small change in the target air void content during mix design is recommended that will result in slightly higher asphalt contents.

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