High-Temperature Behavior of Compound Crumb Rubber Modified Asphalt

The compound crumb rubber modified asphalt(CCRMA) was obtained by adding some amount of waste tire crumb rubber and SBS into base asphalt. The rheological characterization in high temperature and micro-structure of CCRMA was studied by using Dynamic Shear Rheometer (DSR) over wide range of temperatures and Scanning Electron Microscopy (SEM) and Thermogravimetric Analysis (TG). It was found that the network structure of rubber power can adsorb asphalt commendably, so that the heteropolymer-structure was formed in the modified asphalt; the decompose temperature of CCRMA was delayed and the thermal stability improved; the viscidity proportion of CCRMA was increased with temperature rising, but there always existed certain elasticity in CCRMA at 30∼50°C to get better rutting resistant; the viscid-elastic parameter of Burgers model was fitted by the result of DSR, all those can provide theoretic foundation for CCRMA using in north region.