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Design and Evaluation of Ultra Thin Friction Courses Asphalt Mixture Modified by Polyolefin

Because of the small thickness, the mixture temperature of Ultra Thin Friction Courses (UTFC) decreased quickly during construction process, which causes the great difficulty to guarantee the pavement compaction, especially for the dense gradation asphalt mixture. In order to solve this problem, Polyolefin and SBS modified asphalt (Abbrev. PSA) mixture was designed. Volumetric properties, compaction characteristics, water sensitivity, as well as high/low temperature performance of the mixture were investigated. Laboratory test results show the PSA mixture has very good high temperature performance and other beneficial characteristics. Field tests show that the new asphalt mixture possesses very good pavement performance, as well as easily to be constructed. The PSA mixture can be used as preventive maintenance and repair materials.