Alkali-free setting accelerator, and preparation method and application thereof

Abstract

The invention discloses an alkali-free setting accelerator and a preparation method thereof. The alkali-free setting accelerator is prepared from sodium metaaluminate, aluminum sulfate, fluosilicic acid, a complexing stabilizer and water. The preparation method comprises the following steps: 1, mixing sodium metaaluminate with water to obtain a sodium metaaluminate solution; 2, adding aluminum sulfate into the sodium metaaluminate solution for multiple times to obtain a solution I; and 3, sequentially adding the fluosilicic acid and the complexing stabilizer into the solution I. The alkali-free setting accelerator disclosed by the invention has the advantages of high cement setting and hardening speed, capability of meeting engineering construction requirements in later strength and the like under the condition of low mixing amount.

Description

technical field [0001] The invention relates to an alkali-free accelerator and its preparation method and application. Background technique [0002] Accelerator, as a concrete additive, can effectively shorten the setting and hardening time of cement. Accelerator has a great influence on the setting time and early strength of shotcrete. At present, there are many kinds of accelerators in the market, and they are different. Alkaline quick-setting agents generally have high alkali content, strong corrosion and easy to cause physical harm to construction workers, and strong alkali characteristics can easily cause alkali-aggregate reaction, which will significantly reduce the later strength of concrete, reduce the impermeability level, and affect the strength of concrete. Durability is not conducive to the construction of the project. However, the existing alkali-free accelerators mainly have the problems of large dosage, long setting time, high viscosity, easy to produce gel a...

AI Technical Summary

Problems solved by technology

Alkaline quick-setting agents generally have high alkali content, strong corrosion and easy to cause physical harm to construction workers, and strong alkali characteristics can easily cause alkali-aggregate reaction, which will significantly reduce the later strength of concrete, reduce the impermeability level, and affect the strength of concrete. Durability, not conducive to the construction of the project

However, the existing alkali-free accelerators mainly have the problems of large dosage, long setting time, high viscosity and easy gel aggregation and thickening, and the later strength cannot meet the requirements of engineering construction.

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