Anti-rutting anti-fatigue high-modulus composite modified asphalt and preparation method thereof

The invention discloses anti-rutting anti-fatigue high-modulus composite modified asphalt which is prepared from the following raw materials: matrix asphalt, a styrene-butadiene-styrene triblock copolymer, an auxiliary agent, composite natural rock asphalt and a stabilizer. The modified asphalt produced by the invention has the advantages of high-temperature rut resistance, durability, aging resistance, water damage resistance and the like, and has relatively strong rut resistance and elastic deformation capacity, and the low-temperature performance of the modified asphalt is not influenced while the high-temperature stability of the asphalt is remarkably improved. Through the optimal proportion and interaction of multiple components, the modulus, high and low temperature performance and fatigue resistance of the modified asphalt are effectively improved, and the modified asphalt is suitable for being used in the fields of heavy traffic roads, airport pavements and the like. The preparation method is simple a