Elasticity-reducing low-sulfur alkali-free liquid setting accelerator and preparation method thereof

Abstract

The invention relates to an elasticity-reducing low-sulfur alkali-free liquid setting accelerator and a preparation method thereof. The setting accelerator is prepared from the following raw materials: 28%-35% of a first quick-setting component, 7%-12% of a second quick-setting component, 1.5%-2.5% of a third quick-setting component, 2%-4% of an inorganic stabilizer, 2%-5% of an organic reinforcing agent, 0.4%-0.55% of a rebound inhibitor and the balance being water. The first quick-setting component is aluminum sulfate octadecahydrate, the second quick-setting component is aluminum dihydrogen phosphate, the third quick-setting component is sodium metaaluminate, the inorganic stabilizer is sulfuric acid, phosphoric acid and nitric acid, and the organic reinforcing agent is diethanol amine, N-methyldiethanolamine and diethanolisopropanolamine. The rebound inhibitor is formed by mixing hydroxypropyl methyl cellulose, polyacrylamide and redispersible latex powder. The invention also provides the preparation method of the setting accelerator. The high rebound rate in the wet spraying process can be reduced, the strength of concrete in the early stage, especially in the later stage, is increased, and the setting accelerator is good in stability, low in mixing amount, short in concrete setting time and good in adaptability to different kinds of cement.

Description

technical field [0001] The invention relates to an accelerator for concrete, in particular to a bullet-reducing, low-sulfur, alkali-free liquid accelerator, and also relates to a preparation method of the bullet-reducing, low-sulfur, alkali-free liquid accelerator. Background technique [0002] Accelerator is an admixture that can quickly set and harden concrete to ensure that concrete reaches sufficient strength in a short period of time to meet special construction requirements. It has been widely used in tunnels, mining, slope protection, and building structure reinforcement, Anti-crack and anti-seepage, plugging and emergency rescue projects. The traditional quick-setting agent is mainly powder, which has the disadvantages of large rebound, more dust, and uneven dispersion of the quick-setting agent in the concrete mixture. Compared with it, the liquid quick-setting agent has low energy consumption in production and construction. , good homogeneity, no dust pollution an...

AI Technical Summary

Problems solved by technology

In addition, too much SO4 in the alkali-free accelerator 2- It will greatly increase the possibility of concrete forming secondary ettringite, resulting in the loss of strength in the later stage, and it will also cause sulfate corrosion of concrete, and the durability of concrete will decrease

[0004] There are still some problems in the non-alkali quick-setting agent developed at this stage: such as the product is easy to stratify, precipitate, crystallize, poor adaptability to cement, alkali content exceeds the standard, and the strength loss of concrete is too large in the later stage, etc.

[0006] The above technologies have a great impact on how to make the low-sulfur low-sulphur-reduced liquid accelerator can reduce the high rebound rate in the wet spraying process, so that the strength of concrete can be increased in the early stage, especially in the later stage, the dosage is low, the concrete setting time is fast, and the concrete has a fast setting time. Different cements have good adaptability, and no specific guidance is given

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