Abstract: Using stirring temperature, stirring speed, stirring time and the amount of warm mix additive to study the preparation technology of LKWO-Ⅱ warm mix flame retardant asphalt. Changing the amount of warm mix additive to study the influence of warm mix additive on the main technology indexes of flame retardant asphalt. The test results show that the best preparation technology of LKWO-Ⅱ warm mix flame retardant asphalt is that: stirring temperature 130℃, stirring speed 200r/min, stirring time 35min and the amount of warm mix additive is 8‰ by mass. LKWO-Ⅱ warm mix additive can reduce the softening point of flame retardant asphalt and increase the penetration and ductility of flame retardant asphalt. LKWO-Ⅱ warm mix additive can improve the low temperature performance of asphalt and remedy the disadvantage that can decrease the low temperature performance of asphalt of flame retarder.

Key words: warm-mixed additive, flame retardant asphalt, mixture, preparation technology