Case study on balancing mixtures with high recycled materials contents
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2018 Taylor & Francis Group, London. Environmental and economic benefits motivate maximum use of Reclaimed Asphalt Pavement (RAP) and Recycled Asphalt Shingles (RAS) in asphalt mixtures. However, recycled asphalt mixtures with high recycled materials contents can be excessively stiff, brittle, and prone to cracking. A number of factors play into this balance between environmental, economic, and engineering aspects, including the type, source, amount, and proportioning of RAP/RAS, and the type and dosage if a recycling agent is utilized to mitigate the increase in stiffness and cracking susceptibility. This case study investigated the performance of three asphalt mixtures from an Indiana field project in the USA and two additional laboratory mixtures to explore some of these factors after short-and long-term aging. Mixture stiffness and intermediate-and low-temperature cracking resistance tests were performed to quantify the effects. Laboratory and field results highlighted the need for proper material proportioning and evaluation with aging.
