Concrete expansion agent

Abstract

The present invention discloses a concrete expansion agent. The concrete expansion agent comprises the following components, by weight, 45-60 parts of fluorine gypsum, 25-35 parts of fly ash, 2-12 parts of slags, 2-5 parts of alunite, 15-25 parts of a high alumina clinker, 1-3 parts of phenol and 3-6 parts of a retarding and water reducing agent. The concrete expansion agent is prepared through steps of crushing and uniform mixing. According to the present invention, the concrete expansion agent provided by the present invention has a plurality of functions of expanding, water reducing, retarding, collapse protecting, enhancing and the like; only the treatment of grinding is required in the preparation process while the treatment of calcination is not required, the production process is simple, such that a large amount of the energy can be saved, the cost is low, the economic benefit is high, the concrete expansion agent provides more market competitiveness than similar products, the environmental pollution is reduced.

Description

technical field [0001] The invention relates to an expansion agent, in particular to a concrete expansion agent, and belongs to the field of building materials. Background technique [0002] Concrete expansion agent is a concrete admixture with huge market capacity and development prospects. It has the characteristics of reducing the heat of hydration of warm concrete, improving the strength and impermeability of concrete, and compensating for the shrinkage of concrete. Widely used in underwater engineering, flood control engineering and various large-scale concrete construction projects. Currently, the commonly used concrete admixtures in the market include common expansion agents, water reducers, retarders, retarder water reducers, etc. Although these admixtures can improve the quality of concrete to varying degrees, their functions are all single. Therefore, when using these admixtures, in order to facilitate construction and improve the quality of concrete, it is neces...

AI Technical Summary

Problems solved by technology

[0003] However, some existing domestic concrete expansion agents are made of pure raw materials through high-temperature treatment, which has high cost and high energy consumption, and most of them are high-alkali concrete expansion agents, which contain large amounts of fluorine, and the production process is relatively complicated. There is a considerable gap in the international leading product low-alkali concrete expansion agent

According to the literature survey, the waste fluorine gypsum from the production of freon and the fly ash discharged from the thermal power plant have been used as raw materials to produce concrete expansion agent in China, but this expansion agent is simply mixed and finely ground with two kinds of raw materials, and no further research on its performance has been made. Adjustment and improvement, so its dosage is large, need 15-20%, lack of economy