The research for high-performance SBR compound modified asphalt

The high-performance SBR compound modified asphalt can be made with the addition of polyphosphoric acid (PPA), styrene-butadiene rubber (SBR) and sulfur. The effects of PPA, SBR, sulfur on the physical properties, the dynamic theological properties, the high-temperature storage stabilities, the morphologies and the internal structures of asphalts were studied, respectively. The high-temperature storage stability of SBR-modified asphalt can be improved significantly with the addition of PPA and sulfur by the gelation effect and the dynamical vulcanization. The addition of SBR to the pure PPA modified asphalt improved the low-temperature physical properties with unfavourable effects on the resistance to rutting. The addition of sulfur to the PPA/SBR-modified asphalt improved the theological properties and the adhesion of modified binders to stone matrix. The optimal proportion of PPA, SBR, sulfur can improve the properties of asphalt roundly. (C) 2009 Elsevier Ltd. All rights reserved