Study on the Properties of Natural High Modulus Asphalt Hot Recycled Mixture with Different RAP Content
The technical characteristics of high modulus asphalt mixture with low porosity,continuous grading and high asphalt-aggregate ratio were applied to factory-mixed hot recycled asphalt mixture to solve the problem of low temperature crack resistance and insufficient durability of factory-mixed high RAP content hot recycled asphalt mixture.The results show that with the increase of RAP content,the high temperature stability of hot recycled asphalt mixture is improved,but the water stability,crack resistance and fatigue resistance are decreased.The dynamic resilience modulus of 20%RAP-50%RAP natural high modulus asphalt hot recycled mixture under the test condition of 20 ℃ and 10 Hz is not less than 13000 MPa,and the fatigue life under the micro-strain level of 130 pa is greater than 1 million times,meeting the technical index requirements of high modulus asphalt mixture.