Photocatalytic modified aggregate for self-cleaning concrete and preparation method thereof

Abstract

The invention relates to the technical field of aggregate for building concrete, and discloses a photocatalytic modified aggregate for self-cleaning concrete and a preparation method thereof. The photocatalytic modified aggregate is prepared by soaking washed aggregate in self-cleaning photocatalytic suspension slurry, which is prepared from silica fume, nano titanium dioxide, cement, bead powder,quartz stone powder, a dispersant, a retarding type water reducer, water, and a thickening agent. The photocatalytic suspension slurry modifies the natural mineral aggregate in concrete; the developed modified concrete aggregate has a photocatalytic function, the contribution of the aggregate to the photocatalytic function of the concrete is largely improved in the later stage, and the self cleaning function is continuously and effectively improved.

Description

technical field [0001] The invention relates to the technical field of aggregates for building concrete, in particular to a photocatalytically modified aggregate for self-cleaning concrete and a preparation method thereof. Background technique [0002] With the rapid development of society, the rapid development of industry and automobiles has caused the global nitrogen oxide and sulfide emissions to increase year by year, and the global environmental air pollution has become more and more serious, seriously affecting the normal life and health of human beings. How to effectively purify and solve air pollutants has become a research hotspot at home and abroad. Among them, photocatalytic technology can use solar energy to directly oxidize and reduce pollutants such as nitrogen oxides in the air into non-toxic substances. This technology has the characteristics of low preparation cost and low pollution. It is currently recognized as one of the best means of self-cleaning. [...

AI Technical Summary

Problems solved by technology

However, at present, in the preparation of self-cleaning concrete, photocatalysts are generally mixed with cement or sprayed on the surface of the concrete. During the conversion process, the photocatalyst is further hydrated to form a package on the photocatalyst, as well as the friction loss of the surface coating, concrete carbonization, and acid corrosion. Due to the loss of concrete slurry mixed with photocatalyst on the surface due to other reasons, the aggregate without photocatalytic effect is exposed, and the photocatalytic self-cleaning function cannot be continuously and effectively exerted.

[0004] The proportion of aggregate in traditional concrete is 3 to 4 times that of the slurry, and the overall surface accounts for more than 60% of the total volume. Therefore, whether the aggregate has a self-cleaning function is of great importance to whether the concrete can effectively and continuously perform the self-cleaning function. Significance, and the current traditional self-cleaning concrete uses natural mineral aggregates, which do not have self-cleaning properties. Therefore, modifying the aggregate in self-cleaning concrete to have self-cleaning function can further effectively improve the durability of concrete. Effective self-cleaning effect

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