Heating-free non-alkali liquid accelerator for jetting concrete and preparation method of heating-free non-alkali liquid accelerator

Abstract

The invention discloses a heating-free non-alkali liquid accelerator for jetting concrete and a preparation method of the heating-free non-alkali liquid accelerator. The liquid accelerator is prepared from the following components in percentage by mass: 30%-55% of aluminum sulfate, 3%-10% of aluminium hydroxide, 10%-18% of hydrofluoric acid, 8%-25% of magnesium salt, 1%-8% of alkylol amine, 0.5%-4% of a stabilizer, and 10%-33% of water. The preparation method is characterized by comprising the following processing steps: putting aluminium hydroxide into a reaction kettle; adding water to the reaction kettle, and stirring aluminium hydroxide into paste; slowly adding hydrofluoric acid, and when the temperature reaches 50-55 DEG C, adding aluminum sulfate to stir in batches; after hydrofluoric acid is completely added, adding residual aluminum sulfate and supplementing residual water, so as to obtain reaction liquid; adding the magnesium salt to the reaction liquid, and then adding the alkylol amine and the stabilizer, so that the solution becomes evenly mixed liquid. The accelerator disclosed by the invention has strong adaptability with cement, low energy consumption and good performance, and does not need to be heated in the use procedure.

Description

technical field [0001] The invention relates to a concrete admixture, in particular to an alkali-free liquid quick-setting agent for wet spraying concrete, belonging to the technical field of building materials, in particular to a non-heating alkali-free liquid quick-setting agent for sprayed concrete, especially a Alkali-free liquid accelerator for wet sprayed concrete in tunnels and roadways. The invention also relates to a preparation method of the liquid quick-setting agent. Background technique [0002] Accelerator is an admixture that makes cement set and harden quickly, and is mainly used in shotcrete construction. In the construction of tunnels, underground mines and other projects; shotcrete construction has incomparable advantages over ordinary concrete, and has become a necessary measure for such projects. The role of accelerator is to accelerate the setting and hardening of shotcrete and improve its early strength, thus laying the foundation for rapid construct...

AI Technical Summary

Problems solved by technology

Liquid accelerators for wet sprayed concrete include alkali accelerators and alkali-free accelerators. From the perspective of their application, there are the following problems: high alkali content, 28d (28 days) strength ratio reduction, short stability period, production High energy consumption during the process

[0007] The above technologies have not given specific guidance on how to make the liquid quick-setting agent and cement have strong adaptability, no heating and good performance during use.

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