Waste tyre powder modified asphalt and preparation method therefor

Abstract

The invention relates to waste tyre powder modified asphalt and a preparation method therefor. The waste tyre powder modified asphalt provided by the invention is composed of 77-81 parts of matrix asphalt, 18-22 parts of modified waste tyre powder and 0.1-0.3 part of a stabilizer, wherein the modified waste tyre powder is composed of 86.5-98.5 parts of waste tyre powder, 0.3-1 part of organic amine and 0.2-0.5 part of a catalyst and an activator. The preparation method provided by the invention comprises: firstly preparing the modified waste tyre powder; then heating the matrix asphalt to 155-170 DEG C and maintaining the temperature; then gradually adding the modified waste tyre powder into the matrix asphalt; continuously stirring the asphalt by using a suspending shaft stirrer; and finally adding a stabilizer and performing constant-temperature development for 30-60 minutes to prepare the modified asphalt. According to the method provided by the invention, in the whole production process, the temperature is lower than or equal to 170 DEG C. In this temperature range, asphalt is completely free of ageing, so that performances of the asphalt such as viscidity and durability are not affected. Moreover, under the temperature condition, in a production or construction process, escape of toxic gas is not caused, so that the method is green and environmental-friendly.

Description

technical field [0001] The invention relates to a road construction material, in particular to a waste tire powder modified asphalt and a preparation method thereof. Background technique [0002] Waste tire powder modified asphalt is a kind of modified asphalt made by mixing high-dose waste tire powder and matrix asphalt under high temperature conditions with asphalt as the dispersant of waste tire powder. The incorporation of waste tire powder improves the high and low temperature performance, elastic performance and anti-aging performance of asphalt, and improves the road performance index of asphalt: for example, it can improve the wear resistance and cold resistance of the road, prolong the service life of the road surface, and shorten the braking time. Braking distance. On the other hand, waste tire powder is widely used in highway engineering, which can effectively solve the problem of solid waste pollution caused by large-scale waste tires, and can also reduce noise....

AI Technical Summary

Problems solved by technology

This process is the same as the patented process with application number 201310417564.0. The difference is that the high-power colloid mill is replaced by a high-power high-speed emulsifier. The high-speed emulsifying machine also needs to run for a long time, and due to the limitation of the flow rate of the emulsifying machine, the output of waste rubber modified asphalt is also limited. This production process is far from meeting the needs of road construction and development, and the energy consumption is very large. expensive to produce

Another process for the production of waste tire powder modified asphalt is to dissolve the waste tire powder with a solvent first, and then mix it with matrix asphalt to make waste tire powder modified asphalt through high-speed mixing and shearing. This process is due to the process of preparing modified asphalt A large amount of organic solvents are used in the process, and most of these dissolved are carcinogenic, toxic and volatile aromatic hydrocarbons, which will escape in large quantities during production and use, which will damage the physical and mental health of workers and pollute the ecological environment. Therefore, this process is basically not used now.

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