Blended composite modified asphalt and preparation method thereof

Abstract

The invention discloses blended composite modified asphalt, which comprises the following components in percentage by mass: 2 to 6 percent of waste packing polymer EVA, 2 to 15 percent of waste tire powder, 76.5 to 90.5 percent of matrix asphalt, 0.02 to 0.5 percent of cross linker and 1 to 2 percent of catalyst. A preparation method for the blended composite modified asphalt comprises the following steps: firstly, weighing 2 to 6 percent of waste packing polymer EVA, 2 to 15 percent of waste tire powder, 76.5 to 90.5 percent of matrix asphalt, 0.02 to 0.5 percent of cross linker and 1 to 2 percent of catalyst in percentage by mass; and smelting the matrix asphalt at the temperature of between 150 and 180 DEG C, adding the waste packing polymer EVA and the waste tire powder into the smelted matrix asphalt, keeping the temperature constant, manually stirring the mixture for 20 to 40 minutes, adding the cross linker and the catalyst into the mixture, and stirring the mixture for 100 to 120 minutes by a shearing machine to obtain the blended composite modified asphalt. The blended composite modified asphalt and the preparation method thereof of the invention solve the problems of large consumption of waterproof material polymer and complex equipment in the physical modification method for preparing the modified asphalt.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a modified asphalt material, in particular to a blended composite modified asphalt, and also relates to a preparation method of the blended composite modified asphalt. Background technique [0002] The so-called modified asphalt, according to the definition of my country's "GB / T18378-2000 Terminology of Waterproof Asphalt and Waterproof Membrane", refers to the uniform mixing of rubber, synthetic resin and other organic polymers with a molecular weight greater than that of the asphalt itself. mixture. [0003] At present, most of the modified asphalt waterproofing materials are dispersed in the molten asphalt by stirring and grinding the polymer through the hot-melt method, that is, the physical modification method. After modification by this method, the high-temperature rigidity, low-temperature flexibility and temperature sensitivity of asphalt are improved. Although ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a blended composite modified asphalt, which solves the problems of high temperature rigidity, low temperature flexibility and unsatisfactory temperature sensitivity of the existing blended composite modified asphalt

[0005] Another object of the present invention is to provide the preparation method of the above-mentioned blending compound modified asphalt, which solves the problems that the existing physical modification method prepares the modified asphalt material with a large amount of polymer and complicated equipment

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