Antibacterial cement concrete and preparation method thereof

Abstract

The invention relates to antibacterial cement concrete and a preparation method thereof. The antibacterial cement concrete is prepared from the following raw materials in parts by weight: 12-18 parts of cement, 0.6-1 part of metakaolin, 32-55 parts of quartz sand, 58-120 parts of coarse aggregate, 0.012-0.04 part of an antibacterial agent and 5.5-10.5 parts of deionized water. Nano photocatalytic material is doped into the cement concrete as an antibacterial agent, so that the durability of the cement concrete is not influenced, and an antibacterial effect can be achieved for a long time; artificial coarse aggregate is adopted to replace part of natural coarse aggregate, so that the light receiving area of the antibacterial agent in the cement concrete can be increased; in addition, an antibacterial agent is adopted to form a lubricating film on the surface of the coarse aggregate, so that the lubricating degree of the surface of the coarse aggregate is improved, and the fluidity of cement concrete and the material mixing uniformity are improved.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to an antibacterial cement concrete and a preparation method thereof. Background technique [0002] Cement concrete is made of cement, aggregate and water as the main raw materials, and it is an engineering material that has strength after being hardened through mixing, molding, curing and other processes. Cement concrete is exposed to the air for a long time, and it is very easy to accumulate a large amount of bacteria on its surface or cracks. The metabolism of bacteria has an erosive effect on cement concrete and reduces the service life of cement concrete. At present, in order to prevent bacteria from eroding and destroying concrete structures, existing solutions include spraying bactericides, coating bactericidal coatings, and photocatalytic sterilization. Among them, the effect of photocatalytic sterilization is affected by factors such as the properties of nano-p...

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Problems solved by technology

[0003] (1) Concrete is exposed to the external environment for a long time. If the bactericidal coating or nano-photocatalytic material is directly coated on the concrete surface, its service life is short, and it is easy to be damaged or peeled off from the concrete surface; after damage or peeling, although it can be Repeated painting and maintenance, but continuous investment in manpower and materials and other resources is required, and the maintenance cost is relatively high

[0004] (2) Coarse aggregate accounts for about one-half of the volume of cement concrete. If all natural coarse aggregate is used in cement concrete, only nano-photocatalytic materials are added to the cement paste, which significantly hinders the nano-photocatalyst in cement concrete. The contact area between the catalytic material and microorganisms or the increase of the light-receiving area of ​​the nano-photocatalytic material leads to the limitation of antibacterial performance

[0005] (3) Nano-photocatalytic materials are easy to adsorb and agglomerate, and it is difficult to mix them evenly with cement and sand when directly mixed in; even if they are uniformly dispersed in water and added, their dispersibility cannot be guaranteed, and more nano-photocatalytic materials remain in the There is a lot of material loss on the inner wall or bottom of the container, which not only produces a large error in the amount of nano-photocatalytic material doped, but also affects the bactericidal effect during use

Nano-photocatalytic materials have problems such as reduced photocatalytic performance or structural damage in concrete. If only one nano-material is used for photocatalytic sterilization, once its performance is inhibited, it will seriously affect the photocatalytic effect of cement mortar.

[0007] (5) Commonly used fungicides are mostly chemical agents. Spraying fungicides on the surface of cement concrete may cause certain corrosive damage to the structure of the mortar and affect the service life of cement concrete

Moreover, fungicides can only kill microorganisms, but cannot decompose substances such as endotoxins released after death; the remaining substances provide nutrients for new bacteria, which is not conducive to alleviating the erosion and damage of bacteria on cement concrete structures

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