Nano material compound waste crumb rubber modified asphalt for heavy traffic road and preparation process thereof

Abstract

The invention discloses a nano material compound waste crumb rubber modified asphalt for a heavy traffic road. The nano material compound waste crumb rubber modified asphalt is prepared from matrix asphalt, waste rubber powder and nano titanium dioxide, wherein the content of the waste rubber powder accounts for 8 to 30wt% of the matrix asphalt, and the content of the nano titanium dioxide accounts for 0.08 to 0.3wt% of the matrix asphalt. A preparation method of the nano material compound waste crumb rubber modified asphalt comprises the following steps of (1) heating the matrix asphalt to 35 to 160 DEG C, slowly adding the weighed nano titanium dioxide, and performing high-speed shearing for 10 to 30 minutes so as to ensure that the matrix asphalt and the nano titanium dioxide are uniformly mixed; (2) heating the asphalt mixture obtained in the step 1 to 180 to 215 DEG C, slowly adding the weighed waste rubber powder, and performing high-speed shearing for 90 to 100 minutes, thereby preparing the nano material compound waste crumb rubber modified asphalt. The prepared modified asphalt is capable of improving the asphalt storage stability, the asphalt temperature sensitivity (anti-track property at a high temperature and anti-cracking property at a low temperature) and the ultraviolet radiation aging resistance, further is capable of effectively decomposing nitric oxides in automobile exhaust, and has an air purification effect and favorable social and environment-friendly benefits.

Description

technical field [0001] The invention relates to a nano-material composite waste rubber powder modified asphalt for heavy-duty traffic roads and a preparation method thereof, belonging to the technical field of road paving materials Background technique [0002] Process waste tires into waste rubber powder of more than 20 meshes, add a certain proportion of waste rubber powder to base asphalt, and make rubber asphalt after fully reacting under high temperature conditions. Since rubber is a kind of high molecular compound, in addition to being elastic, it also has high self-adhesiveness and inter-adhesiveness. When rubber powder and asphalt are melted together, the viscosity of asphalt increases significantly, which is beneficial to improve the cementation of asphalt mixture. At the same time, asphalt has the characteristics of rubber elasticity and flexibility, so as to improve the high temperature stability and low temperature crack resistance of rubber asphalt concrete. Pr...

AI Technical Summary

Problems solved by technology

[0003] The storage stability of rubber asphalt has become a technical problem in the application. Since the density of rubber asphalt is higher than that of base asphalt, the rubber powder gradually sinks and causes segregation during the use and storage of rubber asphalt, making it difficult to achieve satisfactory road performance.

After the rubber asphalt concrete is paved, with the ultraviolet radiation, the rubber asphalt will gradually age and reduce the low temperature performance, which will lead to cracking and other diseases

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