Compound concrete admixture with early strength and water reduction functions, and preparation method and application thereof

Abstract

The invention discloses a compound concrete admixture with early strength and water reduction functions. The compound concrete admixture is mainly prepared by 10-20 parts by mass of a polycarboxylate water-reducer, 1-5 parts by mass of a surfactant, 5-40 parts by mass of an early strength agent, 2 or less parts by mass of an air entraining agent, and 20-100 parts by mass of water. The preparation method of the compound concrete admixture comprises the following steps: processing a polycarboxylate water-reducer mother liquor to prepare a solution, mixing the polycarboxylate water-reducer solution with the early strength agent, the surfactant, the air entraining agent and water according in proportion, and uniformly stirring. The application of the concrete admixture is realized through the following steps: stirring the concrete admixture and standard sand; taking cement and water, and carrying out low-speed uniform mixing; mixing the above two materials, carrying out low-speed stirring, then carrying out high-speed stirring, intermediately stopping, and then continuously carrying out high-speed stirring; and adding the finally obtained mixture into a mold, and maintaining, wherein the addition of the polycarboxylate water-reducer is not greater than 1% of the amount of a cement mortar. The compound concrete admixture has the advantages of simple preparation method, fast effectiveness, wide application range, low cost and good effect.

Description

technical field [0001] The invention relates to a concrete admixture and its preparation and application, in particular to a concrete admixture with water-reducing function and its preparation and application. Background technique [0002] At present, my country's concrete admixture industry is in the stage of rapid development, and the water reducing agent has a high water reducing rate, which is an admixture worth promoting. Concrete water reducer is the most effective, economical and convenient technical way to reduce the amount of cement, improve the utilization rate of industrial waste residue, and realize the durability and high performance of concrete. The key material for the development of high-tech fields is considered to be the third breakthrough in the field of concrete technology development after reinforced concrete and prestressed reinforced concrete. The research and production of concrete superplasticizers have begun to develop in the direction of high perf...

AI Technical Summary

Problems solved by technology

At present, the method of adding a certain amount of early strength agent to polycarboxylate water reducer is mainly used in China to improve the early strength of coagulation. However, for different early strength agents, there are still large amounts of incorporation. It is still difficult to meet the requirements of concrete engineering with high requirements, especially for concrete engineering requirements in low temperature environments (such as winter construction).