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In asphalt paving, a form of plastic movement resulting in localized bulging of the pavement surface; these distortions usually occur at points where traffic starts and stops, on hills where vehicles brake on the downgrade, on sharp curves, or where vehicles hit a bump and bounce up and down; they occur in asphalt layers that lack stability, usually caused by a mixture that is too rich in asphalt, has too high a proportion of fine aggregate, has coarse or fine aggregate that is too round or too smooth, or has asphalt cement that is too soft; it may also be due to excessive moisture, contamination due to oil spillage, or lack of aeration when placing mixes using liquid asphalts; see Corrugations.

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