Novel shrinkage reducing compacting agent special for concrete

Abstract

The invention relates to products which belong to the technical field of concrete admixture. The technology is characterized by the following steps of: preparing stock solution which comprises the following components: deionized water, calcium oxide, sulphur powder and catalyst, wherein the catalyst consists of mixed solution of methoxypolyethylene glycol, dimethyl 1,3-propanediol and alkylphenol polyoxyethylene ether sodium sulfate; and then preparing an inorganic waterproof shrinkage reducing compacting agent for inorganic concrete, wherein the inorganic waterproof shrinkage reducing compacting agent comprises the following components: the deionized water, the stock solution, triethanolamine, the methoxypolyethylene glycol, the dimethyl 1,3-propanediol, the alkylphenol polyoxyethylene ether sodium sulfate, silicate and a defoaming agent DF-642. The novel shrinkage reducing compacting agent special for the concrete can effectively reduce early shrinkage of the concrete, reduce crack risk, improve compactness of the concrete, improve porosity structure, realize waterproof function and seepage-proof function with low intermingled quantity (0.1 to 2 percent), and improve durability of the concrete to physical corrosion and chemical corrosion. The invention relates to an III type compacting agent used for increasing the compactness and improving the strength of the concrete. The novel shrinkage reducing compacting agent special for the concrete is most suitable for the engineering field requiring high concrete strength and high waterproofing quality.

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

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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