Performance of Recycled Asphalt Concrete Materials in an Arid Climateby Mustaque Hossain, Kansas State Univ, Manhattan, United States,
Larry A. Scofield, Kansas State Univ, Manhattan, United States,
Abstract: Recycling of asphalt concrete pavement is a common practice for highway agencies. In 1981, the Arizona Department of Transportation (ADOT) constructed eight test sections in on experimental asphalt concrete overlay project on Interstate-8 in South-Western Arizona in order to compare long-term performance of recycled and virgin asphalt concrete mixes in an arid environment. This paper discusses the performance of recycled asphalt concrete in comparison to virgin asphalt concrete. The analysis and results of this study indicate that the recycled and virgin asphalt concrete mixes have performed similarly over the service life of the project. The poor condition of one virgin overlay section was appeared to be due to weaker subgrade support. The mean resillent moduli of in-service recycled mixes were similar to the virgin mixes. The thicker overlays outperformed the thinner overlays. Serious rutting was observed on thicker overlay sections partly due to densification of both types of mixes under the traffic load.
Subject Headings: Asphalt concrete | Pavement overlays | Recycling | Asphalt pavements | Concrete pavements | Highways and roads | Arid lands
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