A kind of early-strength antifreeze agent for liquid concrete and preparation method thereof

Abstract

The invention discloses a liquid concrete early strength anti-freezing agent and a preparation method thereof. The anti-freezing agent is prepared from, by weight, 0.5-3.0 parts of organic alcohol amine, 2-6 parts of sodium thiosulfate, 2-4 parts of low-molecular-weight alcohol, 1-5 parts of sodium nitrite, 0.01-0.05 part of air entraining agent, 0.01-0.1 part of solubilizer, 60-70 parts of water and 15-20 parts of polycarboxylate high-performance water reducer. The strength of specified concrete subjected to negative temperature curing for 7 days can reach 15% or above of the strength of concrete subjected to standard curing for 28 days, the strength formed after 7 days of negative temperature curing and 28 days of standard curing reaches 110% or above of the strength of standard cured concrete.

Description

technical field [0001] The invention belongs to the technical field of building material admixtures, and in particular relates to a liquid concrete early-strength antifreeze and a preparation method thereof. Background technique [0002] Our country has a vast territory, and a considerable part of it is in the severe cold zone. Many buildings suffered freeze-thaw damage. Concrete freeze-thaw damage is one of the main problems of building aging diseases in my country, which seriously affects the long-term use and safe operation of buildings. In-depth research on the mechanism of frost damage of concrete, forms of frost damage, influencing factors, and improvement measures, and the development of new types of concrete with good frost resistance have very important economic and social benefits. [0003] An important problem in the construction of concrete at negative temperature or low temperature is that the strength develops very slowly, and the negative temperature can cau...

AI Technical Summary

Problems solved by technology

In the production process of commercial concrete, powdery antifreeze components are directly used, which has problems such as uneven mixing of concrete and poor local antifreeze effect, and most of the powdery antifreeze components need to be fed manually, which consumes manpower and increases the production time of concrete

[0006] However, if the antifreeze component and admixture are compounded in advance, because the antifreeze effect of the commonly used antifreeze component is poor, it will freeze when it is cold, making it difficult to maintain the liquid, and the commercial concrete production cannot be recycled normally, which seriously affects the production of concrete.

[0007] In addition, the construction temperature in winter is low, and the strength of concrete increases very slowly, which seriously affects the construction progress and project quality.

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