Concrete sulfate-corrosion-resistant additive and preparation method thereof

Abstract

The invention relates to a concrete sulfate-corrosion-resistant additive and a preparation method thereof, and belongs to the technical field of civil engineering materials. The concrete sulfate-corrosion-resistant additive mainly comprises, by mass, 30-50% of barium-based modified bentonite, 20-40% of nanometer kaolin / metakaolin, 20-30% of water talcum powder and 10-15% of solid water glass. The preparation method includes the steps of evenly mixing barium-based modified bentonite, nanometer kaolin / metakaolin, water talcum powder and solid water glass in proportion, placing the mixture in a grinding machine to be ground till the specific surface area of the ground powder reaches 400 m<2> / kg or above, and conducting bagging and sealing. By means of the concrete sulfate-corrosion-resistant additive and the preparation method, the sulfate corrosion resistance of concrete can be improved, the compressive strength of concrete can be improved, the concrete hole structure and compactness are improved, and the durability of concrete is improved. The prepared additive has the advantages of being long in timeliness, free of toxin and environment pollution, simple in preparation process and low in cost.

Description

technical field [0001] The invention belongs to the technical field of civil engineering materials, and in particular relates to a concrete sulfate corrosion resistance additive and a preparation method thereof. Background technique [0002] Concrete material has become one of the most widely used and used building materials in the world today due to its high compressive strength, good fire resistance, flexible use, and convenient construction, and it plays roles and functions that other materials cannot replace. However, because the concrete itself is not completely dense, there are many capillary channels inside it. When the concrete structure is exposed to the environment and medium containing sulfate, it may be damaged by sulfate attack. Especially in the saline areas in western China and the eastern coastal areas, the sulfate corrosion damage of concrete is the most serious and common, causing a lot of waste to the country's economic construction. Therefore, it is of gr...

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Problems solved by technology

Although this preservative basically covers all aspects of concrete durability, however, it is not highly targeted, and there are too many types of constituent materials, and the preparation process is cumbersome

There are also some studies that mineral admixtures such as fly ash, mineral powder and silica fume can be used as anti-corrosion agents for concrete against sulfate corrosion. However, the effect of such anti-corrosion agents is not very satisfactory, and sometimes even leads to the reduction of other properties of concrete. , is not conducive to the improvement of concrete durability

In addition, there are some reports that salts and high molecular polymers are used as additives to resist sulfate corrosion, but this type of preservative is also very short-lived, and it is easy to reduce the workability of fresh concrete, which ultimately affects the concrete. Late strength and durability, and may even cause environmental pollution