United States Department of Transportation
i
Evaluation of the Effect of Homogeneity of the Asphalt Binder on Performance of a Recycled Mix
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2019-03-29
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[PDF-2.45 MB]
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Edition:Final report
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Abstract:The road to sustainability passes through the process of recycling a greater amount of asphalt pavement. Inclusion of additional amounts of reclaimed asphalt pavement (RAP) in new mixes has become a prominent method to promote sustainability. This research addresses some of the challenges related to high RAP content mixes. Among the factors considered are the impact of rejuvenator diffusion on binder stiffness, stiffness gradient, performance grade, homogeneity, and ultimately, their effects on mix performance. In this project, an experiment was conducted to evaluate the effects of the rejuvenator type, dosage rate, and mix-aging protocol on recycled binder homogeneity and mix performance. Another experiment was conducted to evaluate the ability of several simulated aging protocols to produce a binder stiffness and stiffness gradient similar to those observed in natural aging. The results show that the target high temperature grade of a recycled mix should be set at 6°C higher than that of virgin mixes. In general, mixes with a high temperature grade of 6°C higher than a virgin mix performed better in rutting and comparably in cracking. There is a strong correlation between binder stiffness gradient and cracking performance. The best simulated aging protocol was to heat the mix to 110°C for 4 days. These results were based on five mixes and a total of 15 mix/aging protocol combinations.
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