To develop asphalt mixtures with good flame-retardant performance for tunnel pavement,an orthogonal experimental design is conducted to determine the optimal mass fractions of warm mix additives and flame retardants.The warm-mix flame-retardant asphalt mixture is designed and evaluated for its road performance.The optimal mixing and compaction temperatures for the warm mix flame-retardant asphalt mixture are determined through experiment,and its road performance,fatigue resistance,and flame retardation are evaluated.The results show that the optimal mixing temperature is 150℃,and the optimal compaction temperature is 140℃.The water stability and fatigue resistance of the warm mix flame-retardant asphalt mixture are significantly improved,and its performance at high and low temperatures is also enhanced.Analysis of parameters such as combustion time,mass loss,and residual stability indicate that the warm mix flame-retardant asphalt mixture can increase the flame retardation of road materials,and improve the basic road performance of materials after fire accidents,and provide data foundation for the application of warm mix flame-retardant asphalt mixtures in tunnel projects.
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