Chlorine-free antifreezing agent for concrete as well as preparation method and application thereof

Abstract

The invention relates to a chlorine-free antifreezing agent for concrete and preparation and application thereof. The chlorine-free antifreezing agent for concrete comprises thiocyanate, a superplasticizer, polyol, polyol amine and optional other components, wherein the other components comprise one or more selected from an air entraining agent, molasses and water. On the basis of the total weight of the chlorine-free antifreezing agent, the mass content of the thiocyanate is 5-20%, and / or the mass content of the superplasticizer is 10-35%. The antifreezing agent disclosed by the invention can effectively reduce a freezing point, accelerate cement hydration, improve the early strength of the cement and remarkably reduce the strength damage caused by freezing injury to the concrete.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a chlorine-free concrete antifreeze and its preparation method and application. Background technique [0002] my country has a vast territory, and there are great differences in climate conditions in various regions. North China, Northeast China, Inner Mongolia, and Xinjiang have long severe cold periods in winter, with temperatures below -5°C, and the lowest temperature is even close to -40°C. When the temperature is below 0°C, the free water in the freshly mixed concrete begins to freeze, which significantly reduces the hydration rate of the concrete, and the concrete cannot harden normally and seriously affects the early strength; at the same time, the free water changes from the liquid phase to the solid phase, and the volume increases to freeze and expand , further destroying the concrete with low early strength. [0003] In order to make concrete harden at nega...

AI Technical Summary

Problems solved by technology

Among the current antifreeze agents, there are generally the following problems: 1) the chloride ions in the antifreeze agent have a corrosive effect on the steel bar, which has an adverse effect on the durability of reinforced concrete; 2) the compatibility of the antifreeze agent with other concrete admixtures Not good, it will affect the effect of the admixture

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