Anti-crack flame-retardant semi-flexible asphalt pavement material applied to cold region tunnel and method for preparing semi-flexible pavement by using anti-crack flame-retardant semi-flexible asphalt pavement material

The invention discloses an anti-crack flame-retardant semi-flexible asphalt pavement material applied to a cold region tunnel and a method for preparing a semi-flexible pavement by using the anti-crack flame-retardant semi-flexible asphalt pavement material. The anti-crack flame-retardant semi-flexible asphalt pavement material comprises large-gap asphalt concrete and cement mortar, THE large-gap asphalt concrete omprises aggregate, waste tire rubber particles, filler and flame-retardant modified asphalt, the flame-retardant modified asphalt comprises a flame retardant and polymer modified asphalt, and the doping amount of the flame retardant is 10-30 wt% of the polymer modified asphalt; and the cement mortar comprises cement, fly ash, ultra-fine sand, a superplasticizer, an expanding agent, anhydrous sodium sulfate and water. The obtained flame-retardant anti-cracking semi-flexible pavement has the advantages of being good in flame retardant property, capable of being applied to tunnel pavements in cold regi