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This paper addresses the increase in moisture damage occurring in asphalt pavements over the past decade. It defines moisture damage and discusses the many causal factors that have been cited, with emphasis on those under the control of the asphalt technologist. The increase in heavy traffic loadings is mentioned as the number one cause of damage, and the potential for poor selection and handling of aggregates to exacerbate the problem is noted. Several methods of evaluating asphalt mixes for susceptibility to moisture damage are given, and the need for a predictive procedure approved by a nationally recognized authority is emphasized. Lastly, several methods of reducing the potential for moisture damage are discussed.
additive, adhesion failure, aggregate, asphalt mix, cohesion failure, laboratory test, moisture damage, moisture susceptibility, prediction, slurry seal, stripping, tensile strength ratio (TSR), traffic volume, voids in mineral aggregate (VMA)
Senior research scientist, Virginia Transportation Research Council, Charlottesville, VA
Research scientist, Virginia Highway and Transportation Research Council, Charlottesville, VA