Preparation method of catalytic degradation type open-graded friction course asphalt mixture

Abstract

The invention relates to a preparation method of a catalytic degradation type open-graded friction course (OGFC) asphalt mixture, belongs to the technical field of pavement materials, and solves the problems that when nano TiO2 is directly added into OGFC, an addition amount is less, a negative influence is generated, agglomeration is easy to have, a concentration of automotive tail gas at the surface of TiO2 is low, the degradation effect is poor, and recycling is difficult to realize. The method comprises the following steps: firstly performing activation treatment on a 13X molecular sieve to remove impurities and broaden pores of the 13X molecular sieve; and preparing TiO2 sol, adding the activated 13X molecular sieve into the sol, performing ultrasonic oscillation, performing uniform mixing, performing filtration to remove a solution and impurities, performing drying, performing calcination to prepare 13X molecular sieve / nano-TiO2 composite photocatalyst particles, substituting thecomposite photocatalyst particles for fine aggregate according to a certain ratio, mixing a asphalt mixture, performing molding on a test piece, testing the road performance and the effect of degrading tail gas of the catalytic degradation type OGFC asphalt mixture, and combining test results to determine a ratio of substituting the composite photocatalyst for the fine aggregate to prepare the catalytic degradation type OGFC asphalt mixture. The asphalt mixture provided by the invention gives the OGFC the function of catalytically degrading the tail gas and improves air quality.

Description

technical field [0001] The invention relates to a method for preparing catalytic degradation type open graded wear course (OGFC) asphalt mixture, which belongs to the technical field of pavement materials. Background technique [0002] In recent years, with the rapid development of my country's national economy and the continuous improvement of the comprehensive transportation network of highways and urban roads, the number of motor vehicles in the country has exceeded 300 million. long developmental stage. However, fuel vehicles emit a large amount of harmful exhaust gas during driving, which has caused serious harm to people's health and living environment. The current severe smog weather is largely due to the pollution of vehicle exhaust. The height of the diffusion and flow of automobile exhaust is within the breathing range of most people, which seriously damages human health, stimulates the respiratory tract, reduces the immunity of the respiratory system, causes vario...

AI Technical Summary

Problems solved by technology

[0014] The invention provides a method for preparing catalytically degradable OGFC asphalt mixture, which uses porous 13X molecular sieves to support nano-modified TiO 2 As a fine aggregate, replace part of the fine aggregate in the OGFC asphalt mixture, thus solving the problem of nano-TiO 2 Directly mixed into OGFC asphalt mixture, the amount of addition is small, which will have a negative impact on the road performance of asphalt mixture, and the specific surface area is large and it is difficult to disperse evenly. TiO 2 The concentration of exhaust gas on the surface is low, the effect of catalytic degradation on exhaust gas is poor, and it is difficult to regenerate and utilize other problems. Under the condition of not affecting the conventional road performance of OGFC, it is endowed with the function of catalytic degradation of automobile exhaust and improving air quality.