Asphalt modified CMAR composite modifier and preparation method thereof

The invention relates to the technical field of asphalt modifiers, and discloses an asphalt-modified CMAR composite modifier which is prepared from 40-70 parts of waste rubber powder, 10-40 parts of chlorinated polyethylene, 2-12 parts of nano carbon black and 8-20 parts of polyolefin wax. The invention also provides a preparation method of the asphalt modified CMAR composite modifier, which comprises the following steps: S1, grinding the raw materials: grinding the waste rubber powder again, and filtering after grinding; s2, mixing the raw materials: putting the raw materials into an internal mixer for open milling; and S3, extruding and granulating. According to the present invention, the compatibility is reasonable, the ingredients are common raw materials, the cost is low, the main component of the composite modifier is the waste tire rubber powder, the modified asphalt prepared by using the composite modifier has the same environmental protection economy as the rubber modified asphalt, the compatibility