Composite-SBS (Styrene Butadiene Styrene block polymer)-particle modified asphalt with storage stability and aging resistance and preparation method thereof

The invention relates to composite-SBS (Styrene Butadiene Styrene block polymer)-particle modified asphalt with storage stability and aging resistance and a preparation method thereof. Composite SBS particles contain the ingredients in percentage by mass: 15-38% of SBS, 56-82% of deep-activated rubber powder and 3-6% of an interface compatibilizer, wherein the deep-activated rubber powder consists of rubber powder, softening oil and an activator. The method comprises the steps: preparing the deep-activated rubber powder from waste rubber powder by using the high-temperature and high-shear action of a twin-screw extruder; thoroughly mixing the SBS particles and the deep-activated rubber powder by using the blending action of screws, and granulating to prepare the composite SBS particles, thereby preparing the modified asphalt. Compared with modified asphalt modified by ordinary SBS modifiers, the composite-SBS-particle modified asphalt has the advantages that the ageing resistance is excellent, and heat storage does not separate out basically. Waste/used tires can be massively consumed, so as to relieve black pollution. According to the modified asphalt, urban noise pollution and road surface microstructure can be lowered, road surface drainage is facilitated, water splashing is reduced, and the safety performance of driving is improved.