Alkali-free liquid setting accelerator containing cellulose and preparation method of alkali-free liquid setting accelerator

Abstract

The invention discloses an alkali-free liquid setting accelerator containing cellulose and a preparation method of the alkali-free liquid setting accelerator. The alkali-free liquid setting accelerator comprises components in parts by mass as follows: 30-60 parts of aluminum sulfate, 5-10 parts of calcium formate, 5-10 parts of calcium fluoride, 0.8-1.6 parts of sulfosalicyclic acid, 1.0-3.5 parts of hydroxyethyl cellulose, 0.8-1.5 parts of polyacrylamide, 0.2-1.0 part of ethylenediamine tetraacetic acid, 1-3 parts of triisopropanolamine, 0.15-1.2 parts of polypropylene glycol, 0.10-1.12 parts of dimethyl silicone, 0.5-1.5 parts of phosphoric acid, 0.5-1.5 parts of hydrofluoric acid, 3-8 parts of magnesium sulfate, 1-3 parts of sodium fluoride, 1-4 parts of trimethylolethane, 2-6 parts of aluminum hydroxide and 30-60 parts of water.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to an alkali-free liquid quick-setting agent added with cellulose and a preparation method thereof. Background technique [0002] Accelerator is an admixture that makes cement concrete set and harden quickly. The main purpose of adding quick-setting agent is to increase the thickness of the first shotcrete sprayed layer, shorten the time interval between two sprayed coats, and improve the early strength of shotcrete so as to provide support resistance in time. Since production and use began in the 1930s, accelerators have become one of the important components of shotcrete due to their remarkable characteristics in quick setting and early strength. Especially with the increase in the number and scale of underground projects and their different functions, the accelerator is not only very important as a component of concrete, but also indispensable in some specific projec...

AI Technical Summary

Problems solved by technology

[0003] Alkaline powder and alkaline liquid accelerators (commonly referred to as "traditional accelerators") have the following problems: ①Large loss of strength in the later stage; ②High alkali content, on the one hand, causes corrosion to construction personnel, Damage to human health, on the other hand, it may also cause concrete alkali-aggregate reaction, resulting in a decrease in concrete strength and durability; ③There is a lot of dust and a large amount of rebound; ④It is not convenient for sprayed concrete wet operations, etc.

[0004] Although the research on liquid non-alkali (low) alkali accelerators in my country has developed rapidly and the proportion of engineering applications has also increased significantly, there are still some problems. For example, the dosage of accelerators is concentrated between 3% and 12%, which is relatively traditional. The dosage is too high at about 2%; there is still some instability in the adaptability of some accelerators to different types of cement, admixtures and admixtures; the price is too high