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Ravelling <br />Progressive Toss of pavement material from the surface downward caused by: stripping of the bitumin- <br />ous film from the aggregate; asphalt hardening due to aging; poor compaction, especially in cold <br />weather construction; or insufficient asphalt content. Slight to moderate ravelling has loss of fines, <br />severe ravelling has loss of course aggregate. Ravelling in the wheel paths can be accelerated by <br />traffic. Repair the dry weathered surface with a sealcoat, or a thin overlay if additional strength is <br />required. <br />Slight <br />Smallest aggregate <br />particles worn away <br />exposing tops of <br />large aggregate <br />Page 38 <br />Moderate to <br />severe <br />Erosion further <br />exposes large <br />aggregate <br />Severe <br />Loss of large <br />aggregate leaves <br />very rough texture <br />(foreground) <br />