Diatomite compound manganese residue modified asphalt and preparation method thereof

The invention discloses diatomite compound manganese residue modified asphalt and preparation method thereof. The modified asphalt is composed of 80-96% of matrix asphalt, 2-8% of diatomite, 2-8% of manganese residue and 2-6% of rubber fine powder. The invention further discloses a preparation method of the modified asphalt. The preparation method includes: heating blocky the matrix asphalt, sieving to obtain a matrix asphalt raw material, drying the manganese residue, diatomite and the rubber fine powder in a constant-temperature box, mixing diatomite, the manganese residue and the rubber fine powder with the matrix rubber raw material according to a preset blending proportion, putting into an oven for roasting development, adopting a high-speed shearer to shear an obtained mixture for high-speed shearing until asphalt is uniform and stable, and obtaining the modified asphalt the surface is smooth after cooling. The modified asphalt is low in cost and simple in preparation process; diatomite and manganese re