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Abstract:This report examines asphalt pavement properties of 117 older highway sections within the State of Alaska. Principal research objectives included: 1) documentation of commonly measured physical properties of the asphalt concrete cores and extracted asphalt cement and 2) characterization of materials properties which provided the best long term pavement performance. Insufficient records existed to evaluate pavement performance on the basis of original properties or aging histories of the asphalt concrete. However, indications that aging progresses rapidly and generally attenuates after 6-8 years justified analyses utilizing aged-materials properties. All correlations and performance trends were therefore derived using aged-properties. Results indicate that best long-term performance is obtained from asphaltic materials which retain softness and low tensile strength throughout the pavement's service life. Aged materials specifications are suggested in the report text which have provided optimum performance. It was concluded that asphalt cement should be subjected to an extended laboratory aging process prior to specification testing which would simulate 4-8 years of field weathering.
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