A kind of antibacterial coarse aggregate and preparation method thereof

Abstract

The invention relates to an antibacterial coarse aggregate and a preparation method thereof. The antibacterial coarse aggregate is composed of an aggregate matrix and an isolation layer; 0.8-2 parts of kaolin, 40-68 parts of quartz sand, 0.1-0.15 parts of basalt fiber, 0.02-0.04 parts of antibacterial agent, 7.5-13 parts of deionized water; the isolation layer is arranged on the surface of the aggregate matrix. After the antibacterial coarse aggregate prepared by the present invention is mixed into concrete, the number of active sites of nano photocatalytic materials in concrete can be significantly increased, and the antibacterial performance of concrete can be improved; the anti-scouring and anti-wear properties of nano photocatalytic materials in antibacterial coarse aggregate The performance is good, which ensures the stability and durability of the antibacterial performance of photocatalytic antibacterial concrete.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to an antibacterial coarse aggregate and a preparation method thereof. Background technique [0002] Aggregate is a granular material that plays the role of skeleton and filling in mortar or concrete, and is one of the necessary building materials for the preparation of mortar or concrete. Aggregate is generally divided into fine aggregate and coarse aggregate. River sand and lake sand are generally used as fine aggregates, and crushed stones and pebbles are generally used as coarse aggregates. Because the concrete is exposed to the air for a long time, bacteria are prone to exist in the surface or cracks, which will cause erosion and damage to the concrete. In order to solve the above problems, existing solutions include spraying bactericides, coating bactericidal paints, and photocatalytic sterilization. The effect of photocatalytic sterilization is affected by facto...

AI Technical Summary

Problems solved by technology

[0003] (1) The method of physical adsorption is mainly by attaching nano-photocatalytic materials on the surface and pores of lightweight aggregates, while the nano-photocatalytic materials on the surface of lightweight aggregates have poor erosion and wear resistance, which easily leads to nano-photocatalytic materials. The loss of catalytic materials; the nano-photocatalytic materials attached to the lightweight aggregate are less and unevenly distributed, which seriously affects the antibacterial performance of photocatalytic antibacterial concrete

[0004] (2) At present, most of the nano-photocatalytic materials in concrete are directly mixed into the cement paste. If only the nano-photocatalytic materials are mixed into the cement paste, the contact area between the nano-photocatalytic materials and bacteria in the concrete will be limited. increase, thus hindering the improvement of photocatalytic antibacterial performance

[0005] (3) Since nano-photocatalytic materials are easy to adsorb and agglomerate, it is difficult to mix them evenly with cement and sand when directly mixed into cement or sand

Even if it is added after being uniformly dispersed in water, in addition to the dispersibility cannot be guaranteed, more nano-photocatalytic materials remain on the inner wall or bottom of the container, and the material loss is more, which not only produces a large error in the amount of nano-photocatalytic materials incorporated, It also affects the bactericidal effect during use