Alkali-free liquid concrete accelerator and preparation method and application of alkali-free liquid concrete accelerator

Abstract

The invention provides an alkali-free liquid concrete accelerator. The alkali-free liquid concrete accelerator comprises the following components by mass: 35-65 parts of aluminum salt, 3-25 parts of inorganic nano material, 0.5-15 parts of first fluorine substance, 0.5-5 parts of water reducer, 0.5-10 parts of second fluorine substance, and 20-50 parts of water; the first fluorine substance comprises one or a mixture of more of fluoride, fluosilicate and borofluoride; the second fluorine substance is fluosilicate. The provided alkali-free liquid concrete accelerator has a good fast hardening effect, the conservation rate of long-term strength of the concrete is high, and the alkali-free liquid concrete accelerator is suitable for spraying the concrete.

Description

technical field [0001] The invention relates to the technical field of quick-setting agents, in particular to an alkali-free liquid concrete quick-setting agent and its preparation method and application. Background technique [0002] Shotcrete is to use air or other power to spray cement, sand, stones and admixtures and other mixtures onto the sprayed surface with the help of spraying machinery, and condense into dense and uniform concrete in a short time. Shotcrete is generally used in coal mines. The special environment requires high durability and later strength of concrete. [0003] In order to make the sprayed concrete solidify quickly, it is necessary to add a concrete quick-setting agent to shorten the time required for the concrete to change from a slurry state to a solid state. The commonly used concrete quick-setting agent is a kind of gray powder product prepared from various components such as aluminum oxide, soda ash, thickener, etc. The powdery concrete quick...

AI Technical Summary

Problems solved by technology

The commonly used concrete quick-setting agent is a kind of gray powder product prepared from various components such as aluminum oxide, soda ash, thickener, etc. The powdery concrete quick-setting agent is not easy to mix with concrete evenly, and the current Generally, more soda ash is added to the concrete quick-setting agent, and the resulting product is relatively alkaline. After being mixed, the strength of the concrete will be greatly reduced in the later stage, which cannot meet the requirements of shotcrete.

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