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This synthesis will be of interest to pavement designers, construction engineers, maintenance engineers, and others interested in avoiding or limiting moisture damage in asphalt concrete. Information is provided on physical and chemical explanations for moisture damage in asphalt concrete, along with a discussion of current practices and test methods for determining or reducing the susceptibility of various asphalt concrete components and mixtures to such damage. Moisture damage in asphalt concrete is a nationwide problem which often necessitates premature replacement of highway pavement surfaces. This report of the Transportation Research Board describes the underlying physical and chemical phenomena responsible for such damage. Current test methods used to determine the susceptibility of asphalt concretes, or their constituents, to moisture damage are described and evaluated. Additionally, current practices for minimizing the potential for moisture damage are examined.
The freeze thaw stress pedestal test, the boil test and the indirect tensile test were evaluated for assessing the stripping potential of typical Alabama asphalt concrete mixes and the effectiveness of antistripping additives. This was accomplished by testing surface and base/ binder mixes with five aggregate combinations, two sources of asphalt cement and three antistripping additives. Because of the test complexity and lack of a strong correlation with stripping performance, the freeze thaw stress pedestal test is not recommended. The boil and indirect tensile tests, in combination, offer a viable, although, imperfect, system for stripping evaluation. The lack of a strong correlation with reported field performance detracts from both tests. However, the imprecise and subjective nature of the reported performance and the correlations obtained by others are mitigating factors.