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This paper summarizes the findings of a six-year study of moisture damage of asphalt mixtures, which was conducted at The University of Texas at Austin. The objectives of the study were to define the nature and severity of moisture damage in asphalt pavement mixtures, develop techniques to identify mixtures that are moisture susceptible, and develop recommendations to eliminate or minimize the problem. While this study has primarily focused on problems and mixtures in Texas, additional mixtures and experience from other areas in North America were considered. The study involved laboratory investigations, including the evaluation of mixtures subsequently used in construction, a field evaluation of methods of treating asphalt mixtures with hydrated lime, and an evaluation of actual pavement mixtures that exhibited moisture damage.
The majority of the work utilized the wet-dry indirect tensile test (Lottman), the Texas freeze-thaw pedestal test, and the Texas boiling test, which are discussed with respect to their ability to estimate moisture susceptibility of asphalt-aggregate mixtures. The results obtained for a variety of antistripping agents, including hydrated lime and silanes, are summarized, along with the results of a field experiment to evaluate methods for using hydrated lime. Finally, recommendations are made with regard to methods of alleviating moisture damage, including methods of treating moisture susceptible aggregate with hydrated lime.
asphalts, aggregates, stripping (distillation), calcium oxides, tests, asphalt mixtures, moisture damage, antistripping additives
Associate dean of engineering for research and planning and Engineering Foundation professor, University of Texas at Austin, Austin, TX