Novel reduction compacting agent special for concrete

Abstract

The invention relates to the technical field of concrete admixture. The admixture is prepared by the following steps of: preparing stock solution which consists of deionized water, sodium hydroxide solution, sulfur powder and a catalyst, wherein the catalyst is a mixed solution of methoxy polyethylene glycol, dimethyl-1,3-malonic acid and alkylphenol polyoxyethylene ether sodium sulfates; and preparing inorganic waterproof reduction compacting agent consisting of deionized water, the stock solution, the dimethyl-1,3-malonic acid, the methoxy polyethylene glycol, the alkylphenol polyoxyethylene ether sodium sulfates, triethanolamine, silicate and defoamer DF-642. The compacting agent is in low admixture, and experiments prove that when the admixture is between 0.1 and 2 percent, early contraction of concrete can be effectively reduced, cracking risk can be reduced, compactness of the concrete can be improved, a porous structure can be improved to realize the function of water resistance and leakage prevention, so that the durability of the concrete on physical and chemical erosion is improved. The invention relates to an I-type waterproof compacting agent, which is most applicable in the engineering field requiring small concrete shrinkage cracking of the concrete and high compactness.

Description

technical field The invention belongs to the technical field of concrete admixtures. The performance of concrete in the fresh and hardened state can be changed by adding certain substances to the concrete mixture, which benefits from the rapid development of the concrete admixture industry in the last 50 years. There are hundreds of admixture products on the market today. In some countries, 70% to 80% of concrete is mixed with one or several admixtures. Admixtures vary widely in composition, from surfactants and soluble salts to polymers and insoluble minerals. Typically, they are used to improve the workability of concrete, to speed up or delay setting time, to control strength development and to improve the durability of concrete against freeze-thaw effects, temperature cracking, alkali aggregate expansion, sulfate attack and steel corrosion. Background technique In modern civil engineering structures such as bridges, harbor works, tunnels, railways, underground works,...

AI Technical Summary

Problems solved by technology

2) Poor concrete impermeability causes leakage damage

3) The open cracks in the concrete lead to the corrosion of the steel bars in the concrete

4) The shrinkage of concrete will affect the volume stability of concrete

The products include sodium methyl siliconate, sodium fluorosiliconate, triethanolamine, soap, rubber emulsion, etc. However, due to the large amount of air entrainment of this type of waterproofing agent, it has a negative impact on the strength of concrete

Although the composite waterproofing agent combines the characteristics of inorganic waterproofing materials and organic waterproofing materials in function, the current product types are less diverse and have high requirements for the use environment.

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