Laboratory Investigation of Asphalt Mixtures Containing Flame Retardants and Synergistic Agents

By using compounded technology of flame retardant and synergistic agent, three groups of compounding flame retardant asphalt systems and relevant SMA asphalt mixtures were designed. On the basis of the oxygen index test and burning test, properties of flame retardancy and smoke suppression were evaluated, as well as the influence of a synergistic agent. Pavement performance of a compounding flame retardant asphalt mixture was evaluated through rutting test, tensile splitting strength test and bending beam test. The results show that the proper synergistic agent can increase the oxygen index of the compounding flame retardant asphalt and the smoke suppression of the asphalt mixture will be significantly improved at the appropriate compound proportion. Smoke suppression of [MH+ZB] is the best and no obvious adverse influences are revealed on high temperature stability, water stability and low temperature crack resistance of asphalt mixture.