Abstract:

In this study， an asphalt modifier （SPM） was prepared through a twin⁃screw extrusion granulation technology using recycled polyethylene/recycled polypropylene/recycled sulfur slag materials as raw materials at a mass ratio of 6/4/0.7. The effect of SPM content on the penetration， ductility， softening point， viscosity， low temperature crack resistance and rheology of modified AH⁃70 asphalt was investigated. The modification effectiveness was verified by the infrared spectrum and microtopography. The results indicated that the introduction of SPM improved the high temperature performance of the modified asphalt significantly， and a certain content of SPM could generate a positive effect on the low⁃temperature performance of the modified asphalt. This work can provide a theoretical basis for the application of SPM modifier in traffic construction.

Key words: recycled sulfur slag, recycled polyethylene, recycled polypropylene, asphalt, modification, property