'Effect of nano-modified ethylene-vinyl acetate on performance of

In order to investigate the effect of nano-modified ethylene-vinyl acetate （MEVA） on physical and rheological properties of styrene-butadiene rubber （SBR） modified asphalt, MEVA/SBR composites modified asphalt with different proportion of MEVA were prepared by blending method. The basic physical properties of the composite modified asphalt were tested, and rheological characteristics was analyzed by using temperature scanning of dynamic shear rheometer. The high and low temperature performance and traffic load grade that the composite modified asphalt could withstand were evaluated by multiple stress creep recovery test and ben-ding beam rheometer. The results showed that the addition of MEVA could effectively improve the physical and rheological properties of SBR modified asphalt, and the modification effect gradually increased with the increase of MEVA amount. Consi-dering high and low temperature properties, the re-commended amount of MEVA was mass fraction of 5%. Compared with SBR modified asphalt, the high temperature grade of MEVA/SBR composite modified asphalt with the best mixing ratio was increased by 18 ℃, and it could bear traffic load of “S” grade at 76 ℃, and its low temperature performance could meet the service temperature grade requirements of -28 ℃.