Research on Application Performance of Warm-mixed Flame Retardant Asphalt and Asphalt Mixture

In order to grasp practical application effect of warm-mixed flame retardant asphalt mixture, the influences of warm-mixed agent and flame retardant agent on warm mix, flame retardant and regular performance were firstly analyzed based on limiting oxygen index and viscosity test and then the technical performance of warm-mixed flame retardant asphalt mixture was investigated by cone calorimeter. The durability of warm-mixed flame retardant asphalt pavement was verified by the accelerated loading test. The results show that there exist obvious warm-mixed effect of Sasobit on SBS modified asphalt and obvious flame retardant effect on FRMAX^TM, without any interference. Based on Sasobit, high temperature performance of SBS modified asphalt is improved and low temperature performance drops. However, FRMAX^TM has a negative effect on both high temperature and low temperature performance of warm-mixed asphalt, without storage stability being influenced. Flame retardant and smoke suppression performances of SBS modified asphalt can be significantly improved by FRMAX^TM, and Sasobit is detrimental to the flame retardant performance of flame retardant asphalt mixture, but with improvement of the smoke suppression performance. With no influence of Sasobit and FRMAX^TM on high temperature stability of SBS modified asphalt mixture, low temperature crack resistance and water stability slightly decrease and anti-fatigue performance declines. Warm-mixed flame retardant asphalt pavement structure shows a good durability on rutting resistance and anti-slide performance.