Abstract: Research and development of a new environmental friendly flame-retarder asphalt were done for the reasons of the flame-retarder which is usually used now will smoke and produce large amounts of poison gas at high temperature, the influence of a compound environmental friendly flame-retarder on flame-retardancy property of SBS modified asphalt were studied by oxygen index test(LOI). The adding amount of compound environmental friendly flame-retarder is determined through the studies of the influence of a compound environmental friendly flame-retarder on flame-retardancy property, physical properties, kinematic viscosity at 135℃, rheological properties at high and low temperature of SBS modified asphalt.The environmental property of environmental friendly flame-retarder asphalt is studied. The rheological properties at high and low temperature and the flame-retarded mechanism of environmental friendly flame-retarded SBS modified asphalt were studied by dynamic shear rheometer,bending beam rheometer, DSC-TG and scanning electron microscope(SEM) test. The test results show that environmental friendly flame-retarder asphalt has good flame-retardancy, physical properties, storage stability and environmental property. The compound environmental friendly flame-retarder can improve the high temperature property of SBS modified asphalt, which can also slightly reduce the low temperature property of SBS modified asphalt. The compound environmental friendly flame-retarder also can increase heat decomposition temperature and initial burning temperature of SBS modified asphalt and the burning poison gas and smoke density was also reduced by it. The environmental friendly flame-retarder asphalt has good performance.

Key words: SBS modified asphalt, flame retardant asphalt, flame-retarder, flame-retardancy property, oxygen index