Experimental study on the effect of synthetic fiber on water resistance of asphalt mixture

fiber asphalt mixture;  polyester;  polyacrylonitrile fiber;  water resistance;  Water-immersion Marshall test;  Freeze-thaw cleavage test

In order to explore the effect of synthetic polymer fibers on the water resistance of asphalt mixture, the optimal amount of fiber was determined by Marshall test and rutting test, and then the improvement effect of synthetic polymer fiber on the water resistance of asphalt mixture was evaluated according to the water-immersion Marshall test and freeze-thaw splitting test specified in the current standard JTG F40-2004. The test results showed that the residual stability of polyester fiber brood and polyacrylonitrile fiber brood on asphalt mixture was increased by 4.4% and 7.8%, respectively. Under 50 and 75 compaction times, the freeze-thaw splitting strength ratio of polyester fiber to asphalt mixture increased by 4.5% and 3.1%, respectively. Polyacrylonitrile fiber increased by 6.9% and 8.6%, respectively.