Composite acetone enhanced alkali-free liquid setting accelerator

Abstract

The invention discloses a composite acetone enhanced alkali-free liquid setting accelerator. An existing alkali-free liquid setting accelerator has the main problems that unstable phenomena such as devitrification and layering can occur after the product is placed for 1-2 months, and the 1d compressive strength of most products cannot meet the standard requirement. The alkali-free liquid setting accelerator comprises the components: fluosilicic acid, aluminum hydroxide, acrylic acid, aluminum sulfate, zinc oxide, magnesium hydroxide, magnesium silicate, potassium hydroxide, a suspending agent, acetone, a stabilizing enhancer and tap water. The stabilizing enhancer comprises the components: acetone, urea, methanol or ethanol and glycerol. The alkali-free liquid setting accelerator is simple to produce, non-toxic and pollution-free, the product does not crystallize after being placed for half a year, the placement stability of the alkali-free liquid setting accelerator product is ensured through a multi-component composite superimposed effect, the expressive force of site construction is improved, the rebound rate is reduced, the 1 d compressive strength is improved, and it is ensured that the later strength does not shrink.

Description

technical field [0001] The invention belongs to the technical field of building materials for support engineering, and in particular relates to a composite acetone-enhanced non-alkali liquid quick-setting agent. Background technique [0002] Accelerators can be divided into alkaline accelerators and non-alkali accelerators according to the alkali content. It is one of the important measures to accelerate the setting and hardening speed of shotcrete so as to provide support capacity in time and ensure structural safety; it is widely used in underground Engineering, mining engineering and various support engineering fields. Alkaline quick-setting agent has high alkali content and strong corrosiveness, which is easy to cause damage to the respiratory system, eyes, skin, etc. of construction workers, and the introduction of a large amount of alkali metal into concrete will also cause the strength of concrete to decrease later, and the potential alkali-aggregate reaction The lik...

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Problems solved by technology

Alkaline quick-setting agent has high alkali content and strong corrosiveness, which is easy to cause damage to the respiratory system, eyes, skin, etc. of construction workers, and the introduction of a large amount of alkali metal into concrete will also cause the strength of concrete to decrease later, and the potential alkali-aggregate reaction Increased likelihood of occurrence, affecting durability of concrete

With the rapid development of high-speed railway, railway passenger dedicated line, urban underground space and the rapid advancement of wet spraying technology, alkaline accelerator can no longer meet the construction technical requirements

The advantages of non-alkali liquid accelerators on the later strength and durability of shotcrete have been widely recognized, but the main problem is that some products will appear unstable phenomena such as devitrification and delamination within 1-2 months. , the 1d compressive strength of most products does not meet the standard requirements

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