A kind of alkali-free and chlorine-free liquid accelerator based on industrial polyaluminum sulfate and preparation method thereof

Abstract

The invention discloses an alkali-free and chlorine-free liquid quick-setting agent based on industrial polyaluminum sulfate. Its raw material formula includes the following components in weight percent: polyaluminum sulfate 35-55%, magnesium sulfate 5-25%, alcohol amine: 15-30% of polyaluminum sulfate, 0-5% of inorganic acid, 0-5% of stabilizer, the balance is water, and the total weight makes up 100%. The liquid quick-setting agent of the present invention can be used in the sprayed concrete wet-spraying industry, belongs to the non-alkali and chlorine-free liquid quick-setting agent, has a stable period of more than 6 months, a 28d compressive strength ratio greater than 100%, and has good adaptability to different cements , when the dosage is 4.5%, it can meet the technical requirements of JC477-2005 "Accelerator for Shotcrete". It is a liquid alkali-free accelerator with superior performance and can be widely used in tunnels, bridges, emergency repairs and other projects.

Description

technical field [0001] The invention belongs to the technical field of building material admixtures, in particular to an alkali-free and chlorine-free liquid quick-setting agent for tunnel and roadway wet shotcrete construction and a preparation method thereof. Background technique [0002] Accelerator is an admixture that makes cement concrete harden quickly, and is mainly used in tunnel shotcrete construction and mortar repair construction. The earliest accelerator that was put into use was the powder accelerator developed by Sika in the 1930s and 1940s. my country began to develop accelerators in the 1870s, and has achieved a number of research results, including Hongxing Type I, Type 711, Yangquan Type I, Yaoshan Type, and Type 782. Although these powdery accelerators have good coagulation-accelerating effects and are cheap, they cause serious corrosion to the eyes and skin of construction workers due to their high alkali content, and cause a large loss of strength in t...

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Problems solved by technology

[0009] In order to solve the problems of high alkali content, large dosage, short stable period, large strength loss in 28 days, high cost and poor adaptability of liquid accelerator, the purpose of the present invention is to provide a high-performance alkali-free and non-alkali based on industrial polymeric aluminum sulfate Chlorine Liquid Accelerator

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