On reasons for rainwater's damage on asphalt concrete roadbed and their prevention

The paper analyzes the reasons for the damages on the asphalt concrete roadbed,explores the ways of how to prevent the rainwater's damage on the roadbed,points out the respective measures,that is,the adoption of dense type on every layer of the asphalt concrete and the drainage waterproof layer of the road structure,so as to direct the practice and improve the waterproof of the asphalt concrete road.