A kind of asphalt mixture adopting direct-throwing high-adhesion modifier and its preparation method

Abstract

The invention relates to a bituminous mixture using a DVS (direct vat set) high-adhesion modifier and a preparation method thereof. The bituminous mixture is prepared from aggregates, a DVS high-adhesion bituminous mixture modifier and matrix asphalt by mixing, wherein the modifier is prepared from high-desulfurization-degree reclaimed rubber, modified high-temperature coal tar pitch and a skeleton proppant by stirring and extruding. Waste rubber is deeply activated under the high temperature and high shearing action of a twin screw extruder, so that the high-desulfurization-degree reclaimed rubber is obtained; then, the mixture of the modified high-temperature coal tar pitch modified by rubber pyrolysis oil, the high-desulfurization-degree reclaimed rubber and the skeleton proppant is fully mixed by using a screw, and then extruded and granulated so as to obtain the DVS high-adhesion bituminous mixture modifier; and finally, the modifier, the aggregates and the matrix asphalt are mixed so as to obtain a DVS high-adhesion bituminous mixture. The bituminous mixture disclosed by the invention has excellent water damage resistance, good high-temperature rutting resistance and low-temperature crack resistance.

Description

technical field [0001] The invention relates to a pavement pavement material, in particular to an asphalt mixture using a direct-throwing high-adhesion 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, large-scale vehicles, heavy load, and overloading are 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 asphalt additives ...

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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