摘要：

This proposed research would evaluate the structural and drainage performance of RAP in regards to long‐term flexible and rigid pavement structural performance which are the primary concerns for WSDOT. This study will evaluate high percentage RAP as base materials. The percentage of RAP to be evaluated will range from 20% to 100%, at an increment of 20%. The engineering performance of high percentage RAP will be evaluated, in terms of modulus, rutting potential, drainage, and stripping by which WSDOT is concerned. In addition, the field performance of pavements with high percentage RAP will be assessed. Another critical issue of RAP is the field quality acceptance criteria, especially the implication of asphalt to the nuclear densometer readings. The study will study and develop an appropriate specification for quality control by WSDOT, including, but not limited to, laboratory/field compaction methods to determine maximum density, acceptance criteria, and the method to determine field density. Using RAP as base course materials will contribute to sustainability by saving cost and energy and reducing greenhouse gas emission. The study will quantify the impact of using RAP on cost, energy, and greenhouse gas emission and compare to that of crushed aggregate. A life cycle analysis of RAP will be conducted.

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