Abstract: In order to improve the road performance of ordinary emulsified asphalt in the micro surface mixture, the emulsified asphalt with high performance was prepared by the method of emulsification first and then modification. The addition method of modifier and the proportion of modifier blending were determined by using the indexes of ductility and softening point, and then it is used as cementing material for the micro-surface mixture. The performance of resistance to water damage and wear resistance of the wet wheel were verified by the wear test (WTAT), and its crack resistance and shear resistance were verified by splitting test and high-temperature rut test. The results show that the softening point and ductility of the composite modified emulsified asphalt are better than ordinary emulsified asphalt, while the blending ratio of SBR with waterborne epoxy resin is 3.5% to 2.5%, ductility and softening point can reach 400 mm and above 70 ℃.The performance test of the mixture showed that the micro surface mixture made of modified emulsified asphalt had significant advantages in water loss resistance/wear resistance, crack resistance and shear resistance compared with the ordinary micro surface mixture.

Key words: composite modification, micro-surfacing, performance of resistance to water damage, wear resistance, cracking resistance, the shear performance