Direct-vat type high-adhesion bituminous mixture modifier and preparation method thereof

Abstract

The invention discloses a direct-vat type high-adhesion bituminous mixture modifier and a preparation method thereof. The modifier is prepared by regenerated rubber with high desulfurization degree, modified high-temperature coal tar pitch and a skeleton proppant at the mass ratio of (30-50) to (30-50) to (5-20) in stirring and extruding manners. The preparation method of the modifier comprises the following steps: deeply activating waste rubber through high-temperature and high-shearing action of a double-screw extruder, thus obtaining the high-desulfurization degree regenerated rubber; fully mixing a mixture of the modified high-temperature coal tar pitch, the high-desulfurization degree regenerated rubber and a skeleton backing material, which is modified by rubber pyrolysis oil under the blending action of a screw; and extruding and pelleting, so as to prepare the direct-vat type high-adhesion bituminous mixture modifier. The modifier disclosed by the invention is directly fed when the mixture is stirred, no extra equipment is used, and the process is simple and easy to operate; the bituminous mixture prepared by the method has excellent moisture damage resistance, good high-temperature anti-rutting performance, low-temperature crack resistance and excellent economic and social benefits.

Description

technical field [0001] The invention relates to a traffic pavement pavement material, in particular to a direct-throwing high-adhesive asphalt mixture modifier and a preparation method thereof, belonging to the technical field of traffic pavement overlay materials. Background technique [0002] With the rapid development of my country's road transport industry, the phenomenon of large-scale, heavy-loaded and overloaded vehicles is becoming more and more serious. Many pavements that have not been completed have suffered from diseases, and even have to be overhauled in advance. This also shows that ordinary asphalt concrete pavements cannot meet the requirements of the modern road transportation industry for its high-temperature anti-rutting stability, low-temperature crack resistance, and water damage resistance. For this reason, while improving the asphalt pavement structure, highway builders are also taking more measures to improve the performance of modified asphalt and as...

AI Technical Summary

Problems solved by technology

This method has a limited activation effect on rubber powder, and the interfacial bonding force of unactivated rubber powder asphalt is relatively weak, and the adhesion to stone will also decrease, which in turn affects the water damage resistance of asphalt mixture.

In addition, although this method also adds some engineering plastic polymers, which can improve the high-temperature performance of asphalt mixture, it will also directly lead to the decline of low-temperature performance.

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