Application on Fiber-Enhanced Asphalt Mixture in Surface Layer of Large Longitudinal Slope Pavement of Xi-Sang Highway

Abstract

This paper investigated into the application of fiber-enhanced asphalt mixture in surface layer of the large longitudinal slope pavement of Xi-Sang Highway. Asphalt mixture with and without polyester fiber were used. Focus is on resistance of deformation at high temperature and flexibility at low temperature. Fiber-enhanced asphalt mixture with dynamic stability above 7000 passes/mm indicated excellent rutting resistance. The high temperature dynamic modulus of fiber-enhanced asphalt mixture was much higher than conventional SBS modified asphalt mixture. Three-point blending test result indicated that the maximum flexural strain of fiber-enhance asphalt mixture reached 4180μm/m. It was concluded that fiber-enhanced asphalt mixture was suit to be used in surface layer of the large longitudinal slope pavement of Xi-Sang Highway.