Alkali-free liquid accelerator and preparation method thereof

Abstract

The invention provides an alkali-free liquid accelerator. A preparation method for the alkali-free liquid accelerator comprises the following steps: dissolving 1-5 parts of iminodisuccinic acid or salt thereof in 100 parts of water, adding 15-30 parts of aluminum sulfate and 5-15 parts of pseudo-boehmite, conducting stirring for at least 30 minutes, adding 0.5-1 part of triisopropanolamine and 1-3 parts of a dispersion stabilizer after stirring, performing continuous stirring, dropwise adding 1-2 parts of latex, and after dropwise addition, adjusting the pH value of the whole system to 6-8. The alkali-free liquid accelerator is simple in preparation method, high in initial setting speed and final setting speed and high in later strength.

Description

technical field

[0001] The invention belongs to the technical field of concrete additives, and in particular relates to an alkali-free liquid quick-setting agent and a method for preparing the alkali-free liquid quick-setting agent. Background technique

[0002] In recent years, shotcrete has been widely used in my country's urban construction and road construction projects, especially the railways and highways in the west of my country. Due to the mountainousness in the west, a large number of tunnels will be built during the construction process. At the same time, its 1d compressive strength should be as high as possible, and the subsequent compressive strength loss rate should be as low as possible.

[0003] Accelerator is an indispensable key material in shotcrete. Accelerators are divided into alkali accelerators and alkali-free accelerators. At present, alkali-free liquid accelerators are the main development direction of accelerators. It has the advantages of friendly...

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