Efficient liquid antifreezing agent for concrete, and preparation method thereof

Abstract

The present invention relates to an efficient liquid antifreezing agent for concrete, and a preparation method thereof, and belongs to the technical field of building materials. The efficient liquid antifreezing agent for the concrete is characterized in that: the efficient liquid antifreezing agent is prepared from an efficient water reducing agent, a formate, an organic alcohol amine, a carbonate, ethylene glycol, an air entraining agent and water, wherein a ratio of the efficient water reducing agent to the formate to the organic alcohol amine to the carbonate to the ethylene glycol to the air entraining agent to the water is (48-75):(2.0-7.6):(1.2-3.0):(30-57):(65-92):(0.8-1.6):(60-275). The antifreezing agent has characteristics of good freezing resistance, high early strength, chloride-free property, high water reducing rate and high working performance. More importantly that, the addition amount of the antifreezing agent in the cement concrete is small so as to promote the early hydration rate of the cement, such that the early strength of the cement is improved while the high late strength of the cement is ensured so as to improve the mechanical property and the durability of the concrete. In addition, the antifreeze can be used under a negative temperature environment having a temperature more than -18 DEG C.

Description

technical field [0001] The invention relates to a high-efficiency liquid antifreeze agent for concrete and a preparation method thereof, belonging to the technical field of building materials. Background technique [0002] In many areas of our country, the temperature of concrete in winter construction is mostly below 0°C. In some areas in the north, the lowest winter temperature sometimes reaches minus 20-30°C, and in the central region, the winter temperature sometimes reaches about -10°C. If the temperature drops below the freezing point of concrete hydration water, the hydration water will freeze and affect the concrete hydration process, the strength will develop slowly and fail to meet the age requirements, and the ice expansion stress will cause the internal structure of the concrete to be damaged. It will adversely affect the strength and durability of concrete. [0003] In order to prevent the concrete under negative temperature from being damaged by freezing, addi...

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Problems solved by technology

[0010] The above-mentioned antifreeze agents can lower the freezing point of water and enable concrete to develop strength at negative temperatures, but the dosage is relatively high, which will have varying degrees of adverse effects on the durability of concrete, such as chloride ions causing corrosion of steel bars and excessive alkali content. High prone to alkali-aggregate reaction, etc.

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