Abstract: In order to investigate the changes of pavement application and fire safety performance of flame retardant asphalt under different aging conditions, 85 min short-term aging, 270 min long-term aging and long-term wet heat aging of flame retardant asphalt were carried out by rotating film oven (RTFOT). The penetration, softening point, ductility and viscosity were used to research the pavement performance indexes of aging flame retardant asphalt. At the same time, the fire safety performance of aging flame retardant asphalt was investigated by combining the Oxygen index test (LOI), thermogravimetric test (TG) and conical calorimetry test. The experimental results show that the anti-aging performance of the flame retardant asphalt is better than that of the base asphalt, which can effectively reduce the influence of asphalt aging on the pavement performance. In terms of fire safety performance, with the increase of thermal oxygen aging time, the decomposition of flame retardant is more, the oxygen index of flame retardant asphalt decreases, and the release rate and amount of smoke at the initial stage of combustion increase. However, in the late combustion stage, due to the formation of multiple components of asphalt during the aging process, the combustion of asphalt can be effectively inhibited, and the release rate of hot smoke is reduced.

Key words: flame retardant asphalt, thermal oxygen aging, damp heat aging, road performance, fire safety performance