United States Department of Transportation
i
Effects of Reclaimed Asphalt Pavement (RAP) Contents and Sources on Dynamic Modulus (|E*|) and Fatigue Performance of Asphalt Mixtures in Georgia
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2016-09-01
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[PDF-2.28 MB]
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Abstract:This report presents the effect of RAP contents and sources on the dynamic modulus and the performance of Georgia asphalt concrete mixtures. Asphalt concrete mixtures were prepared based on two Job Mix Formulas from North and South with 12.5mm nominal maximum aggregate sizes and three asphalt binders (PG 64-22, PG67-22, and PG 76-22). Dynamic modulus tests and controlled crosshead cyclic tension fatigue tests were performed for the prepared specimens and predicted performance by LVECD and Pavement ME programs to investigate the effect of RAP contents and sources on mixture characteristics. Analyses reveals that Superpave mixtures with higher PG binder and increased RAP content (up to 30% RAP) result in higher dynamic modulus as the mixtures become stiffer. S-VECD and LVECD analyses shows that the addition of RAP up to 25 percent using GDOT’s COAC method significantly improved the mixtures’ fatigue resistance, especially in the mixtures with binder grades of PG 64-22 and PG 67-22 since the RAP mixtures are likely to contain more binder than the virgin mixes in accordance with the COAC method. Further, Pavement ME analyses were conducted for 25% RAP mixtures with PG64-22 and PG 67-22. Based on Pavement ME analyses, it was concluded that the half-grade change of binder (PG64-22 and PG67-22) would not induce significantly different performance albeit rut depth prediction indicates some variation.
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