United States Department of Transportation
i
Long-Term Performance of Asphalt Concrete Mixed with RAP and RAS
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2020-07-01
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[PDF-8.68 MB]
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Edition:Final Report; Jan 2019 – May 2020
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Abstract:The objective of this project is to evaluate the short- and long-term aging performance of high RAP and RAS asphalt mixtures utilizing various recycling additives (“rejuvenators”) in the context of balanced mixture design. Mixtures were evaluated for workability using gyratory compactor derived parameters, rutting and moisture susceptibility using the Hamburg Wheel-Track Test (HWTT), intermediate temperature cracking using the Indirect Tensile Asphalt Cracking Test (IDEAL-CT), and low temperature cracking using a modified IDEAL-CT test. It is concluded that the recycling additives used in this study can be used to produce an asphalt mixture containing high amounts of RAP with similar performance to a virgin mixture utilizing the same components using concepts of balanced mixture design. However, the use of 5% RAS in conjunction with RAP is shown to cause difficulties in restoring cracking resistance relative to the virgin mixtures. The effect of aging on mixture performance is significant and measuring mixture performance using at least two levels of aging is recommended to evaluate the efficacy of the various recycling additives in terms of long-term performance.
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