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Determining the Effect on Asphalt Mixture Performance by Increasing New Asphalt Binder Content Due to Inactive RAP Binder in the Mixture
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2023-11-01
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[PDF-5.07 MB]
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Edition:Final Report December 2021 – November 2023
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Abstract:The project aimed to determine the impact of adding additional virgin binders in consideration of recycled binder availability (RBA) on the performance of asphalt mixtures containing reclaimed asphalt pavements (RAP). To that end, a literature review was first conducted to select a suitable RBA value (i.e., 80%) for RBA mixtures in Florida, followed by a laboratory testing plan to characterize the performance properties of RAP mixtures and their corresponding extracted asphalt binders, with and without RBA adjustment. Overall, the results indicated that adding additional virgin binders in consideration of reduced RAP binder availability improved the cracking resistance but reduced the rutting resistance of RAP mixtures (and extracted binders), and these impacts were more pronounced at 40% RAP content than at 20% RAP content. With RBA adjustment, the 20% RAP mixtures with a Performance Grade (PG) 76-22 polymer-modified binder had similar cracking resistance but significantly better rutting resistance than the 40% RAP mixtures with a PG 52-28 binder.
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