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Executive Summary <br />Stripping of hot -mix asphalt (HMA) under chip seals on urban streets has been an issue for <br />years. This project studied the issue to determine what causes the stripping and how to deal with <br />the stripping. Low density or high air voids appear to be the main cause of the stripping. Lab <br />testing validated the theory that HMA mixes not prone to stripping will strip if not properly <br />compacted. Better construction methods are recommended. <br />