Novel special concrete contraction reducing type compacting agent

Abstract

The invention discloses a novel special concrete contraction reducing type compacting agent, which relates to a novel special concrete contraction reducing type compacting agent, and belongs to the technical field of concrete admixture. The preparation method of the product comprises the following steps: preparing stock solution with deionized water, sodium sulfide solution, sulfur powder and a catalyst, wherein the catalyst is mixed solution of methoxypolyethylene glycol, dimethyl-1, 3-propylene glycol and alkylphenol ethoxylate sodium sulfide; and then preparing an inorganic waterproof contraction reducing type compacting agent for inorganic concrete with deionized water, the stock solution, triethanolamine, methoxypolyethylene glycol, dimethyl-1, 3-propylene glycol, alkylphenol ethoxylate sodium sulfide, silicate and a defoamer DF-642. The compacting agent is prepared under the low intermingled quantity, and experimental results show that when the intermingled quantity is 0.1-2 percent, the invention can effectively reduce the early contraction of the concrete, decrease the cracking risks, enhance the concrete compaction, improve the pore structure, and achieve the functions of preventing water and leakage, thereby enhancing the resistance of the concrete against physical and chemical erosion. However, the invention relates to an II type compacting agent, which has a significant effect on the reduction of the concrete contraction and is particularly applicable to the engineering field with strict requirements for concrete contraction and cracking.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures. The properties of concrete in the freshly mixed and hardened state can be changed by adding certain substances into 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. [0002] 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 [0003] In modern civil engineering structures such as bridges, harbor works, tunne...

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

[0018]Although composite waterproofing agents combine the characteristics of inorganic waterproofing materials and organic waterproofing materials, the current product types are less diverse and have high requirements for the use environment

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