Modifier for cement concrete and method for improving performance of cement concrete

Abstract

The invention discloses a modifier for cement concrete and a method for improving the properties of cement concrete. The modifier is silica sol obtained by partial hydrolysis of orthosilicate. The modifying agent can cover the surface of the cement concrete material after it is molded, so as to modify and maintain the cement concrete. The present invention uses a weak acid as a catalyst to partially hydrolyze orthosilicate to form a network-like transparent sol with a small size, which can more easily penetrate into cement, mortar and concrete, and at the same time avoid the destructive effect of strong acid on cement and concrete. The formed protective layer can inhibit the entry and erosion of external corrosive media. The preparation process of the sol is simple, the composition of raw materials is small, the operation is convenient, the cost is low, and the effect is remarkable. It can be widely used in the modification of cement, mortar and concrete materials, and has important significance for the early prevention and later maintenance of cement, mortar and concrete. .

Description

technical field [0001] The invention relates to a modifier suitable for cement concrete and a method for using the modifier to improve the performance of cement concrete. Background technique [0002] Cement, mortar and concrete are mixtures of various materials with a certain porosity, and are often damaged by the erosion of the external environment during use, such as chloride ion erosion, sulfate damage, and carbonation damage. Treating the surface of cement, mortar and concrete is the most commonly used protective measure, mainly to form a protective layer on the surface to inhibit the entry of external corrosive media and resist erosion. At present, there are some researches on applied technologies at home and abroad, such as patent CN 02136959.3 which discloses a permeable concrete protective agent and its preparation method, which uses sodium silicate hydrate as the main agent, and adds an excitation accelerator, and mixes it. Another example is the patent CN 2006100...

AI Technical Summary

Problems solved by technology

Silica sol can be prepared by acid catalysis or alkali catalysis, but because there are more alkaline substances in cement or concrete, at present, when silica sol is used to protect cement or concrete, alkali catalysis is used. Form silica sol to prevent acid from reacting with alkaline substances in cement or concrete, reducing the performance of cement or concrete

However, the silica sol in the silica sol obtained by alkali catalysis exists in the form of nanoparticles, which has poor penetration and is difficult to enter the surface and matrix of cement, mortar and concrete more effectively. If the penetration problem can be solved, It can more effectively harden cement, mortar and concrete surfaces and improve their performance

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