Laboratory Performance of Asphalt Mixtures Containing Recycled Asphalt Shingles, Reclaimed Asphalt Pavement, and Recycling Agents

Abstract

AbstractAs the price of liquid asphalt continuously climbs, methods are being sought to decrease material costs without compromising material or pavement performance while having a positive influence on sustainability. One potential method is the use of recycled materials, such as recycled asphalt shingles (RAS) and reclaimed asphalt pavements (RAP). The objective of this study was to characterize the laboratory performance of conventional asphalt mixtures and mixtures containing RAP and/or RAS, with and without recycling agents (RAs). The RAS type utilized in this study was postconsumer waste shingles. Six 12.5-mm asphalt mixtures were designed to meet certain criteria with four of the six mixtures containing no RAs and two mixtures containing RAs [Hydrogreen and soft asphalt binder (Asphalt & Wax Innovations, Pass Christian, Mississippi)]. A suite of laboratory tests was used to ascertain the mechanistic behavior of the mixtures evaluated against major distresses. Laboratory testing evaluated the high-,...