Cement concrete accelerator

Abstract

The invention relates to a cement concrete accelerator. The accelerator comprises 50-65% of aluminium-oxygen clinker, 25-35% of calcined alunite, 3-8% of zinc sulfate and 6-8% of anhydrite. According to the accelerator, the resilience rate is low, the later strength is high, the compression strength retention rate for 28 days can reach more than 90%, and the alkali charge is low, and harm to an operating worker can be reduced greatly.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular to a quick-setting agent for cement concrete. [0002] Background technique [0003] The existing accelerators abroad mainly include Sigunite, Isocrete and Tricosal, all of which use sodium carbonate (Na 2 CO 3 ) and sodium aluminate (NaAlO 2 ) as the main component, and the dosage is generally 2 to 4% of the cement weight. The addition of these accelerators reduces the 28-day compressive strength of cement concrete by 20 to 40%. Domestic commercially available accelerators are basically based on alumina clinker alone or alumina clinker mixed with an appropriate amount of soda ash, lime, anhydrous gypsum or alum mud and other inorganic materials as the main component. The weak point of above domestic and foreign existing technology is that production quick-setting agent consumes a large amount of soda ash, and in use, shotcrete 28 days strength reduces greatly, although domestic...

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Problems solved by technology

The weak point of above domestic and foreign existing technology is that production quick-setting agent consumes a large amount of soda ash, and in use, shotcrete 28 days strength reduces greatly, although domestic 782 type quick-setting agent, though alkali consumption is low, the later stage strength The reduction is small, but the product is easily weathered during storage, which slows down the setting and cannot be used, and when preparing shotcrete, the amount of accelerator is also large

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