Concrete with high water reducing rate, water reducing agent used and preparation method thereof

Abstract

For overcoming the defects of a polycarboxylate water reducing agent, the invention provides concrete with a high water reducing rate, a water-repelling polymer concrete water reducing agent which is high in water reducing rate, good in retention effect and good in adaptability to cement, and a preparation method of the water-repelling polymer concrete water reducing agent. The water-repelling polymer concrete water reducing agent is prepared from the following components in percentage by weight by means of copolymerization: 40-55 percent of a water-repelling surfactant, 25-40 percent of an acrylic acid monomer, 15-20 percent of polyhydroxy-alcohol containing 3-8 carbon atoms, 3-5 percent of an oxidant, and 1-1.5 percent of a chain transfer agent. The preparation method of the water-repelling polymer concrete water reducing agent comprises the steps of dissolving, mixing, stirring while heating, copolymerizing, regulating the pH value and the like. The water-repelling polymer concrete water reducing agent disclosed by the invention is excellent in performance, high in water reducing rate, low in amount of admixture, small in time loss in collapsed slump, good in adaptability, good in adaptability to a gel material and excellent in anti-freezing effect and anti-rusting effect. The preparation method is simple to operate during production, needs no heating and no purified water, is low in energy consumption and environment-friendly and realizes zero pollution and zero emission during production, so the preparation method is an environment-friendly synthesis method and satisfies new requirements on environmental health.

Description

technical field [0001] The invention relates to a concrete admixture, in particular to concrete with a high water-reducing rate, the water-reducing agent used and a preparation method thereof. Background technique [0002] Cement concrete is the most important product of the modern construction industry. Water reducing agent is one of the important admixtures of cement concrete. Water reducing agent is an admixture that reduces water consumption under the condition of ensuring the same workability of concrete mixture. The use of water reducing agent can reduce the amount of cement and improve the workability and durability of concrete. It is the core of ready-mixed concrete . At present, the third-generation high-performance water reducer represented by polycarboxylate water reducer is the mainstream of the water reducer market. The current mainstream product in the market is the copolymerization of acrylic acid and unsaturated polyether macromonomer to form polycarboxyla...

AI Technical Summary

Problems solved by technology

The polymerized polycarboxylate superplasticizer has good performance, high water reducing rate, good retention effect, and good adaptability to cement, but this type of product has high requirements for concrete materials, is sensitive to the dosage, and is resistant to mud poor force

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