Special admixture for steam curing concrete in winter and its production method

Abstract

A special additive for steam curing of concrete in winter and a production method thereof. The additive is characterized by comprising the following raw materials by weight: 10%-15% of aluminum sulfate, 0.2%-0.5% of citric acid, 4%-7% of sodium nitrate, 0.1%-0.2% of methyl cellulose, 25%-30% of a poly carboxylic acid water reducing agent with solid content of 20% and 47.3%-60.7% of water. The preparation method is as below: first adding water in a feed mixer; then adding aluminum sulfate, citric acid and sodium nitrate according to the proportion into the feed mixer, and stirring for 20-30 min to practically dissolve solid particles; then adding the methyl cellulose and the poly carboxylic acid water reducing agent according to the proportion into the feed mixer, and stirring for 20-30 min until to practically dissolve solid particles, so as to obtain a colorless transparent liquid product. The invention has the advantage that aiming at the problems of easy cracking and reduced strength and durability in steam curing of concrete in winter in severe cold areas, a multiple-ingredient compounding way is employed, and the ratio of raw materials and dosage can be adjusted according to the change of environmental temperature, so as to ensure the normal production of steam curing of concrete under the minimum temperature of below 0 DEG C and to ensure strength and durability of the concrete. The invention has good environment-friendliness.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a special admixture for steam curing concrete in winter and a production method thereof. Background technique [0002] At present, prefabricated buildings are developing rapidly, and the severe cold areas in the north are especially suitable for the application of prefabricated buildings. The prefabricated concrete components for prefabricated buildings are basically produced by steam curing. When the winter temperature drops below 0°C, when the steam-cured concrete prefabricated components are transferred to the outdoor yard for stacking, the concrete components are prone to cracks, strength and durability due to large temperature differences, frost heaving of residual moisture in the concrete, and other reasons. reduced sex. In the winter production of prefabricated buildings in severe cold regions, it is urgent to solve this technical problem, and the research and developme...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a winter-specific admixture and production method for steam-cured concrete that can solve the problems of easy cracking, reduced strength and durability in winter production of steam-cured concrete in severe cold regions