Hazardous chemical substance-free magnesium-aluminum fluoride system alkali-free setting accelerator without hazardous chemical substances and preparation method thereof

Abstract

The invention provides a hazardous chemical substance-free magnesium-aluminum fluoride system alkali-free accelerator which comprises the following components in parts by weight: 40-55 parts of aluminum sulfate, 0-15 parts of magnesium sulfate, 3-8 parts of magnesium fluosilicate, 0.5-1.5 parts of magnesium hydroxide, 0-8 parts of cryolite, 1-14 parts of amine compounds and 20-30 parts of water. According to the hazardous chemical substance-free magnesium-aluminum fluoride system alkali-free setting accelerator provided by the invention, the reaction system reaction can achieve the dissolutionreaction, and the prepared accelerator does not contain hydrofluoric acid and fluosilicic acid, so that harmful gas cannot be generated during the construction process, the influence of the harmful gas on the health of the construction personnel is avoided, the pollution of the harmful gas on the air is avoided, and the safety and the environmental protection are provided.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a non-hazardous chemical-free magnesium-aluminum fluoride system alkali-free accelerator and a preparation method thereof. Background technique [0002] Liquid accelerator is an admixture that can quickly set and harden the cement-containing binder and produce a certain strength. It is mainly used in wet sprayed concrete, and is widely used in high-speed rail, high-speed, subway tunnels and other projects. [0003] Liquid accelerators for wet shotcrete include alkali and non-alkali liquid accelerators. The main problems of alkali accelerators are high alkali content, large loss of 28d strength, strong corrosion and harm to operators. Healthy; the main problems of alkali-free accelerators are large dosage, short stable period, and low 1d strength. [0004] For the development of non-alkali liquid accelerators, fluoroaluminum complex liquids have rapid setting effects, ...

AI Technical Summary

Problems solved by technology

Hydrofluoric acid or fluorosilicic acid will remain in the quick-setting agent, which will lead to the problem of low 1d strength of the mortar. In addition, because hydrofluoric acid or fluorosilicic acid is a hazardous chemical, it may be damaged during transportation, production, and on-site construction. Damage to the health of workers, especially the shotcrete construction environment is generally a poorly ventilated tunnel, and the spraying construction time is generally longer than 10 hours, and the residual hydrofluoric acid or fluosilicic acid will float in the air for a long time, which is harmful to the health of workers have a big impact

[0005] Existing patent CN107857501A - an alkali-free coagulation accelerator containing coagulation accelerator and organic amine substances and its preparation method, the formula is aluminum sulfate, magnesium sulfate, sodium fluoride, organic amine substances, thickener, stabilizer The alkali-free quick-setting agent is prepared through the above formula, and no hazardous chemicals such as fluosilicic acid or hydrofluoric acid are used at all, but the prepared quick-setting agent lacks a large amount of magnesium-aluminum fluoride compound, and the setting time is poor , a large amount of organic amines must be introduced, which will greatly increase the product cost and is not conducive to industrial production

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