A kind of non-alkali and non-chlorine dormant wake-up agent composition for wet shotcrete and its application method

Abstract

The invention discloses an alkali-free and chlorine-free dormant wake-up agent composition for wet shotcrete and a method for using the same. The dormancy agent in the composition consists of fluorosilicate, hydroxycarboxylic acid, chelating agent, polyacrylic acid and water. ; The wake-up agent in the composition is composed of water-soluble calcium salt, alkanolamine, silica sol and water. The beneficial effects of the invention are: the product does not contain alkali metal ions such as potassium and sodium, and does not contain chloride ions. It can effectively improve the working performance retention time of wet shotcrete and at the same time effectively improve the spraying effect of shotcrete. It has good adaptability to alkaline and non-alkali accelerator, and the application method is simple.

Description

technical field [0001] The invention relates to the field of concrete admixtures, in particular to an alkali-free and chlorine-free dormant wake-up agent composition for wet sprayed concrete and a use method thereof. Background technique [0002] With the acceleration of traffic construction in western my country and the development of tunnel construction technology in recent years. Wet shotcrete is used in more and more tunnel primary support. After the wet sprayed concrete is mixed in the concrete mixing station, it is transported to the tunnel face for spraying construction. Since the tunnel construction is mostly located in mountainous areas with inconvenient traffic, and the working face of the tunnel construction is narrow, the delivery time of the wet shotcrete is usually 1-2 hours, or even longer. During the construction of shotcrete in tunnels, the construction interruption time is often too long due to accidents, and the mixed shotcrete cannot be unloaded due to ...

AI Technical Summary

Problems solved by technology

The addition of these substances containing alkali metal ions to concrete may cause a decrease in the strength and durability of the concrete in the later period

Studies have shown that the retarding effect of phosphonic acid organic compounds on concrete is too strong. When added to shotcrete, the adaptability to accelerators is not good, which will easily lead to poor spraying effect of shotcrete.

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