Rock-asphalt-based high-modulus bituminous mixture additive and preparation method thereof

The invention relates to a rock-asphalt-based high-modulus bituminous mixture additive and a preparation method and an application method thereof. The rock-asphalt-based high-modulus bituminous mixture additive comprises 25-75 parts by weight of rock asphalt, 5-25 parts by weight of polypropylene, 3-10 parts by weight of rubber powder, 5-20 parts by weight of aromatic oil, 5-20 parts by weight ofa flexibilizer and 1-5 parts by weight of an SBS modifier. The rock-asphalt-based high-modulus bituminous mixture additive is simple in preparation process and low in cost, can effectively improve thepermanent deformation resistance, the anti-shearing ability, the high-temperature rut resistance, the low-temperature crack resistance and the fatigue performance of a bituminous mixture, achieves dual purposes of improving high-temperature rut resistance of a bituminous pavement and improving the durability of the pavement, and also achieves the environmental protection purpose due to reuse of rubber powder. 本发明涉及基于岩沥青的高