Preparation method of light-weight asphalt mixture with photocatalytic degradation function

Abstract

The invention provides the preparation of a light-weight asphalt mixture with a photocatalytic degradation function by loading nano titanium dioxide (TiO2) on a light-weight aggregate through a porous performance, and belongs to the technical field of road surface materials, aiming at solving the problems of the TiO2 loaded on an asphalt road surface that the dispersion effect is poor, the doping amount is low, the photocatalytic efficiency is low, the degradation effect is poor and pavement performances are influenced. A preparation method comprises the following steps: taking butyl titanate as a precursor and preparing TiO2 sol with a sol-gel method; impregnating the light-weight aggregate into the sol; enabling the TiO2 to enter a light-weight aggregate gap by adopting a vacuum adsorption method; drying and calcining to prepare the light-weight aggregate loaded with the nano TiO2; then replacing one part of a common aggregate by adopting the loaded type light-weight aggregate, and designing a matching ratio of the asphalt mixture to respectively determine gradation and an optimal asphalt-aggregate ratio of each mixture; testing each pavement performance of the asphalt mixture; testing the effect of the asphalt mixture on an automobile tail gas degradation experiment and combining the experimental result of each pavement performance to determine the optimal doping amount of the light-weight aggregate, and preparing the asphalt mixture to pave an environment-friendly asphalt road surface.

Description

technical field [0001] The invention is a nano-titanium dioxide (TiO 2 ) to prepare light asphalt mixture with photocatalytic function, which belongs to the technical field of pavement materials. Background technique [0002] Emissions from motor vehicles are one of the main sources of air pollution. A large amount of nitrogen oxides, carbon oxides and HC compounds are emitted, which will cause serious harm to human health and the living environment. However, due to the rapid increase in the number of motor vehicles, the total amount of vehicle exhaust emissions is increasing day by day. Therefore, how to purify the pollutants emitted by motor vehicles more effectively has become a research hotspot at home and abroad. As a new environmental protection technology in the 21st century, nano photocatalytic purification measures have been widely used in environmental governance. Among many photocatalytic materials, nano-TiO 2 Because of its special photoelectric characteristi...

AI Technical Summary

Problems solved by technology

[0008] The invention is a kind of lightweight asphalt mixture with photocatalytic function prepared by utilizing the porous performance of lightweight aggregates to load nano-titanium dioxide (TiO2), which solves the problem of currently loading nano-TiO on asphalt mixtures. 2 Poor dispersion effect, low dosage ratio, low photocatalytic efficiency, and poor degradation effect