Low-alkali setting accelerator, and preparation method and application thereof

Abstract

The invention discloses a low-alkali setting accelerator and a preparation method thereof. The low-alkali setting accelerator is prepared from aluminum sulfate, sodium metaaluminate, magnesium fluosilicate, hydrofluoric acid, triethanolamine, a stabilizer, an inorganic modified material and water. The preparation method comprises the following steps: 1, mixing aluminum sulfate I, sodium metaaluminate and water I to obtain a solution I; 2, sequentially adding magnesium fluosilicate and hydrofluoric acid into the solution I to obtain a solution II; 3, mixing aluminum sulfate II, water II and thesolution II to obtain a solution III; and 4, mixing aluminum sulfate III, triethanolamine, a stabilizer, an inorganic modified material and the solution III. The low-alkali setting accelerator provided by the invention has good low-temperature stability, and still has short setting and hardening time and good strength at a low temperature.

Description

technical field [0001] The invention relates to a low-alkali accelerator and its preparation method and application. Background technique [0002] Accelerator is an indispensable additive in shotcrete construction, which can make concrete set and harden quickly, and reach a certain strength in a short time to meet engineering requirements. Most of the accelerators currently on the market are alkali accelerators with an alkali content ≥ 18% by weight, and low-alkali accelerators have an alkali content ≥ 6% by weight and less than 18% by weight, while alkali accelerators have an alkali content of ≥ 6% by weight and less than 18% by weight. It will have an impact on the environment and human health. To study non-alkali or low-alkali accelerators is to find new alkali metal materials that can replace them. Therefore, low-alkali or non-alkali accelerators will be recognized in the market and widely used. . In the severe cold area in the north in winter, during the transportatio...

AI Technical Summary

Problems solved by technology

In the severe cold area in the north in winter, during the transportation and construction of the quick-setting agent, it is easy to crystallize and freeze, resulting in frozen blocks. These frozen blocks lose their function under the action of expansion stress, and the concrete strength is greatly reduced.

However, the existing low-alkali quick-setting agent has the problems of poor low-temperature performance, poor low-temperature stability, and high viscosity, which is not easy for later on-site construction.

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