Asphalt modified CMAR composite modifier and preparation method thereof

Abstract

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 in the asphalt system is improved, and the blending temperature is reduced.

Description

technical field [0001] The invention relates to the technical field of asphalt modifiers, in particular to an asphalt-modified CMAR composite modifier and a preparation method thereof. Background technique [0002] At present, my country's traffic has the characteristics of high density, axle load and serious channelization, which makes asphalt pavement prone to temperature shrinkage cracks in winter, which affects the appearance of the pavement and weakens the overall smoothness of the surface; in summer, it is easy to appear under heavy traffic conditions Diseases such as rutting, shifting, and crowding affect the normal service function of the road surface. In order to improve these diseases of the road surface, more and more highways of all grades are now advocating the use of rubber powder modified asphalt. [0003] Rubber powder modified asphalt is a new type of high-quality composite material. Under the combined action of heavy asphalt, waste tire rubber powder and a...

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Problems solved by technology

[0006] Aiming at the deficiencies in the prior art, the invention provides a kind of asphalt-modified CMAR composite modifier and its preparation method, mainly to solve the problem that the modifier used in the existing rubber powder modified asphalt is waste tire rubber powder, processing The efficiency is low, the polarity of rubber powder is far from that of asphalt, and the product after processing has poor stability. Whether it is used directly or further compounded, its thermal storage stability is extremely poor, and the higher the amount of rubber powder, the finished product The greater the viscosity, the easier it is to affect the construction quality due to viscosity changes during the construction process, which cannot meet people's requirements.

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