Evaluation of Test Methods to Predict Moisture Damage in Asphalt Concrete
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1990-05-01
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Edition:Final Report April 1988 - January 1990
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Abstract:The actual moisture susceptibility of 10 bituminous mixtures placed in the field was compared to the moisture susceptibility that was predicted during the laboratory evaluation of the same mix design. Laboratory mixtures were evaluated using the modified Lottman procedure and the Root-Tunnicliff procedure, in addition to routine moisture susceptibility testing which includes immersion compression testing. After two years, cores were taken from the field projects. The condition of the cores and their present susceptibility to moisture damage were determined by performing modified Lottman and Root-Tunnicliff testing. A feature of the evaluation process was the use of the ACMODAS program to predict the remaining service life of the plant mix cores. The validity of the process of predicting remaining pavement service using Modified Lottman or Root-Tunnicliff testing will not be known until the pavements in the study reach their terminal distress and require repair or rehabilitation. The comparisons of modified Lottman, Root-Tunnicliff and immersion compression testing data of the same mixtures provide some interesting results.
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