Water reduction type three-expansion source cement expansive material

Abstract

The invention discloses a slushing type three expansion source concrete expansion agent, which is characterized by comprising preparation of raw materials such as anhydrite, high alumina chamotte, high-calcium sulphoaluminate chamotte, calcined magnesite and so on by weight portion and externally doped slushing agent and water retention agent. The preparation method of the expansion agent comprises steps of crushing, common mixture, mixing and grinding and external doping mixture and finish product forming. The product has low alkali content, excellent expansion performance, synchronous shrinkage-compensating effect and strong suitability with concrete; and newly mixed concrete has small bleeding rate and high vicidity of slurry, and the slurry has strong function of coating and supporting aggregate to greatly reduce the phenomenon of sinking of coarse aggregate, so that the newly mixed concrete keeps good homogenization in the construction process and balanced mechanical property after hardening, and is simple and convenient to use and easy to control quality in construction. The slushing type three expansion source concrete expansion agent is suitable for multiple kinds of concrete for construction.

Description

technical field [0001] The present invention relates to concrete, especially concrete expansive agent. technical background [0002] With the large-scale application of commercial and high-performance concrete in my country, the prominent contradiction is that the probability of cracks in concrete engineering increases, and harmful cracks are directly related to the durability of structures. Commercial housing has involved people's livelihood issues, and users have strongly responded to this. In recent years, the Ministry of Construction and engineering circles have attached great importance to the control of concrete cracks. From the material point of view, concrete expansion agent, shrinkage reducer, steel fiber and synthetic organic fiber are all effective measures to reduce or disperse cracks, but in terms of material price and construction convenience, expansion agent has more advantages. Academician Wu Zhongwei of my country pointed out that "micro-cracks to visible c...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a water-reducing concrete expansion agent with three expansion sources, which can overcome technical defects such as low expansion rate of water-reducing composite expansion agents on the market, insufficient synchronization of compensation for shrinkage, and high alkali content. It has the characteristics of high expansion efficiency, low alkali content, simultaneous compensation for shrinkage, good compatibility of components, strong adaptability to cement, etc. It is convenient for on-site mixing and on-site pumping.

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