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Manual for Thin Asphalt Overlays - SJSU

All roads suffer from normal wear and tear on a daily basis. As a result, preservation treatments are regularly required to maintain these roads to meet the public’s travel needs. Thin asphalt overlays are one of many preservation treatments for roads that receive light to medium traffic volumes, and sometimes heavy traffic volumes. Thin asphalt overlays are usually placed over existing asphalt concrete pavement by placing a Hot Mix Asphalt (HMA) from 1/2 inch to 1-1/2 inches in thickness, by using a self-propelled asphalt paving machine. The HMA is rolled as soon as possible to ensure compaction of the mix for its longevity. The authors have developed engineering guidance from project inception through troubleshooting construction problems. The guidance and recommendations are detailed in a new manual, which represents the best practices for the design and construction of thin asphalt overlays.

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