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Designing HMA Mixtures with High RAP Content: A Practical Guide

This guideline is written to provide a practical means to allow up to 30 to 40 percent RAP to be used in HMA. It encompasses material selection, mix design, plant verification, and quality control. The value of the materials in RAP and the increased percentages suggested makes it necessary to perform a thorough evaluation of the component materials. The mixture must also undergo a thorough testing regimen and an aggressive quality control/quality assurance program.

This publication is a companion document to another NAPA report entitled Recycling Hot-Mix Asphalt Pavements, which describes methods used in the processing of RAP for use in HMA.

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