Key Performance for Improving Storage Stability of TBS Modified Asphalt by Adding RGO

This chapter investigates the preparation and conventional properties of G/R/SBS composite modified asphalt. Results indicate that the simultaneous feeding method of rubber powder and SBS modifier (method 3) yields optimal asphalt performance, simplifying the process, enhancing dispersion uniformity, and enabling waste tire rubber powder reuse. The optimal development temperature was set at 180°C±5°C, with determined dosages for rubber powder, SBS, stabilizer, and extraction oil. Graphene, even at low levels, impacts base asphalt properties, reducing penetration and ductility while leaving the softening point largely unchanged. For SBS-modified asphalt, graphene has minimal performance impact but reduces aging ductility, negatively affecting low-temperature performance. Among various graphene composite materials, composite 3# demonstrates the best overall performance. When added to rubber asphalt, graphene improves high-temperature performance but degrades low-temperature performance under unactivated rubber powder conditions. An activation temperature of 230 °C proves superior for TBS asphalt. The impact of graphene doping on TBS asphalt performance varies with doping ratio and activation temperature. Among four types of composite graphene materials, B-7, C-3, and some D-class materials show significant performance improvement, balancing high and low-temperature performance with economic benefits. These findings provide critical parameter optimization and theoretical support for preparing high-performance G/R/SBS composite modified asphalt, promoting its application in road engineering.