Low-dosage high-early-strength alkali-free liquid accelerator and preparation method thereof

Abstract

The invention discloses a low-dosage high-early-strength alkali-free liquid accelerator and a preparation method thereof. The alkali-free liquid accelerator is prepared from the following raw materials: 1, an alkali-free liquid accelerator; 50%-60% of modified aluminum sulfate, 2%-4% of a fluorine-aluminum complex solution, 3%-6% of an organic cosolvent, 1%-2% of a pH regulator, 0.5%-1.5% of an inorganic stabilizer, 0.3%-0.5% of a viscosity regulator, 4%-6% of a composite early strength agent and the balance of water, wherein the sum of the mass percentages of the components is 100%. The invention also provides a preparation method of the alkali-free liquid accelerator. The preparation process of the alkali-free liquid accelerator is simple; hydrofluoric acid-free process, alkali-free, chlorine-free, rust-free steel bar, non-polluting environment. Meanwhile, when the mixing amount of the alkali-free liquid accelerator is 5%-6%, the technical requirements of GB / T35159-2017 on the alkali-free accelerator can be met, the one-day compressive strength is larger than or equal to 13.0 MPa, and the alkali-free liquid accelerator has the advantages of being low in mixing amount, good in stability, high in early strength and large in later strength retention rate.

Description

technical field [0001] The invention relates to a concrete admixture, in particular to a low-volume, high-early-strength, alkali-free liquid accelerator. The invention also relates to a preparation method of the low-volume high-early-strength alkali-free liquid accelerator. Background technique [0002] In recent years, shotcrete has played an increasingly important role in my country's infrastructure construction and urban construction projects, and the amount of shotcrete has been increasing. Especially with the increasing number of tunnel construction projects in the process of high-speed railway and highway construction in western my country, higher and higher requirements are put forward for the performance and durability of shotcrete. As an essential admixture for shotcrete, accelerator is used to accelerate the setting and hardening of shotcrete, reduce rebound loss, prevent shotcrete from falling off due to gravity, and improve the early strength of concrete. The d...

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Problems solved by technology

[0003] However, most of the current non-alkali liquid accelerator products use industrial-grade aluminum sulfate as the main accelerator component, and the following problems generally exist: (1) The dosage is relatively high

[0005] The above-mentioned technologies are helpful for how to make the preparation process of the non-alkali liquid quick-setting agent simple, without hydrofluoric acid, alkali-free, chlorine-free, no corrosion of steel bars, no pollution to the environment, no harm to the body of the operator, and at the same time the non-alkali liquid quick-setting Low dosage of agent and good stability, no specific guidance scheme is given

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