Concrete workability regulator and preparation method thereof

Abstract

The invention discloses a concrete workability regulator and a preparation method thereof. The concrete workability regulator comprises the following components: an unsaturated polyether macromonomer,an unsaturated ester monomer, a chain transfer agent, a strong oxidant and a hydrophilic modifier, wherein the molar ratio of the unsaturated polyether macromonomer to the unsaturated ester monomer to the hydrophilic modifier is (0.5-1.5):(0-0.2):(1.65-5.3); the addition amounts of the chain transfer agent and the strong oxidant respectively account for 0.17-0.67% and 0.25-1% of the mass of the unsaturated polyether macromonomer; and the chain transfer agent is a chain transfer agent with reducibility, and the strong oxidant is at least one of potassium permanganate and potassium dichromate.The concrete workability regulator is prepared by polymerizing the chain transfer agent with weak reducibility and the strong oxidant under the condition of no external heat source, the molecular weight of the concrete workability regulator is larger, the concrete workability regulator has thickening and water retention effects, the workability of concrete is improved, and the gas content of the concrete cannot exceed the standard.

Description

technical field [0001] The invention belongs to the technical field of concrete, and in particular relates to a concrete workability regulator and a preparation method thereof. Background technique [0002] Polycarboxylate high-performance water reducer is widely used in various industries due to its advantages of low dosage, high water reducing rate, low slump loss, low shrinkage, no environmental pollution in the production process and designability of the product itself. It is also the most active high-performance superplasticizer researched at home and abroad in recent years. However, with the large-scale construction of concrete construction projects across the country, the demand for concrete has increased suddenly, and the environmental protection has increased in recent years. The particle gradation of sand is poor, there are many fine particles, and the mud content is large, and the cohesion of the mixed concrete is not good, loose and easy to segregate, which is n...

AI Technical Summary

Problems solved by technology

However, with the large-scale construction of concrete construction projects across the country, the demand for concrete has increased suddenly, and the environmental protection has increased in recent years. The particle gradation of sand is poor, there are many fine particles, and the mud content is large, and the cohesion of the mixed concrete is not good, loose and easy to segregate, which is not convenient for construction; on the other hand, with the promotion of energy conservation and environmental protection, minerals in cement There are more and more types of admixtures, and the adaptability of polycarboxylate superplasticizers to cement is also particularly prominent.

[0003] In response to the above problems, those skilled in the art are also constantly researching countermeasures, such as using thickeners, air-entraining agents, etc. to improve the workability of concrete, but the problem cannot be completely solved during use.

Because commonly used thickeners such as cellulose, wenlun gum, and rubber powder are not compatible with polycarboxylate water reducers due to their own solubility; and there are many types of air-entraining agents, and the dosage is small, and air bubbles will be introduced when used improperly. The size is not easy to control, and the air content of concrete exceeds the standard, etc.

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