Laboratory Refinement and Field Validation of 4.75 mm Superpave Designed Asphalt Mixtures, Volume I: Final Report

The main objective of this study is to refine the current procedures and criteria for 4.75 mm nominal maximum aggregate size (NMAS) Superpave designed mixtures. A literature review was completed to understand the history and practical use of 4.75 NMAS Superpave designed mixtures. Next, a laboratory test plan was created. This test plan included performing numerous Superpave mix designs using materials provided by each state participating in the study. For each material and mix design, aggregate properties were measured, optimum asphalt content was determined for a given compaction effort and design air void percent, and performance tests were conducted to determine how well the mixtures performed for a given set of properties. The results of these mix designs were compared with the current AASHTO specification for 4.75 mm NMAS Superpave mixtures. These comparisons coupled with the results of the performance tests are used to measure the appropriateness of the current specification and to make improvement recommendations. This report presents the findings of the pooled-fund 4.75 mm Superpave refinement project.

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