Study on Performance of Composite Flame-retardant Asphalt Material in Tunel

Abstract

In order to study the pavement performance of flame-retardant asphalt mixture, firstly, three kinds of compound flame-retardant modified asphalt, 3%, 6% and 9%, were prepared by high speed shearing method. The optimum dosage of composite flame retardant material was selected through segregation test, oxygen index test and smoke density test. Secondly, the road performance of asphalt mixture was analyzed by rutting test, low temperature splitting test and freezing thawing splitting test system. The results show that when the dosage of flame-retardant composites is 6%, the segregation degree of SBS modified asphalt mixture is the minimum, and it can effectively improve the flame retardant effect and smoke suppression effect of SBS modified asphalt. The high temperature stability and the low temperature crack resistance of the 6% composite flame retardant asphalt mixture have been improved, while water stability has not been much affected.