United States Department of Transportation
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Alternative Title:Recycling Asphalt Pavements, Elkhart County, Indiana
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Abstract:The study was initiated to evaluate the performance of recycled bituminous material as the base course of reconstructed county roads. The cold recycling process has been used in recent years by Elkhart County, Indiana to upgrade sections of distressed roads. The evaluation is based on a comparison of the material from laboratory extraction and gradation tests and the pavement structure from Dynaflect tests before and after treatment. Dynaflect tests and PCA Roadmeter tests were also run six, eight, eleven, and seventeen months after construction to evaluate the performance of the recycled pavement under traffic. Gradation results indicate that the before and after treatment material is very similar. An excess of asphalt was present in the treated material. Also, the gradations both before and after were quite dense and both indicated a deficiency of material greater than 1/2". Considerable variability was noticed relative to gradation and asphalt content indicating that the processed material was not homogeneous. The Dynaflect parameters developed from tests on the treated material verified the lack of uniformity. A simple comparative cost analysis clearly shows the cold recycling process is significantly less expensive than the hot mixed, hot placed material. In this study the cost in place of a plant mixed base such as Indiana's HAC #5 Base was three times more than the recycled material.
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