Waste tire rubber powder modified asphalt and preparation method thereof

The invention discloses a waste tire rubber powder modified asphalt which is prepared from the following raw materials in parts by weight: 45-55 parts of matrix asphalt, 18-28 parts of waste tire rubber powder, 3-6 parts of polyethylene wax, 8-11 parts of 3-(dodecaalkoxy)-2-hydroxypropyl-N-acetoxy-N,N-dimethylammonium chloride, 4-7 parts of pine tar, 2-5 parts of diallyl disulfide, 1-3 parts of cyclic monosulfide and 5-8 parts of modifier. The modifier is composed of the following raw materials in parts by weight: 23-27 parts of dodecylphosphate, 13-21 parts of stearic acid, 5-10 parts of sodium lignosulfonate, 1-3 parts of butyl amine and 3-7 parts of diimidazoline. The rubber powder modified asphalt mixture obviously lowers the temperature in the production, spreading and rolling process, thereby lowering the energy consumption, reducing the emissions of dense smoke and toxic gas, promoting the large-scale popularization and application of the rubber powder modified asphalt mixture, and being beneficial to