Concrete antifreezer

Abstract

The invention discloses a concrete antifreezer. The antifreezer comprises, by weight 40-50 parts of tobermorite and 50-60 parts of antifreezing component, wherein the antifreezing component comprises potassium acetate or sodium acetate and lithium acetate or lithium nitrate, and the molar ratio of lithium and potassium or sodium in the antifreezing component is 0.1-0.8. According to the concrete antifreezer, the production process is simple and feasible, the cost is low and the concrete antifreezer is suitable for industrial production.

Description

technical field [0001] The invention relates to a concrete antifreeze, in particular to a concrete antifreeze with low salt content and low alkali-aggregate reaction effect. Background technique [0002] Concrete antifreeze refers to a concrete admixture that can continuously hydrate and harden concrete under negative temperature, and achieve the expected performance under specified curing conditions. In my country's "Three North" areas, winter lasts for a long time, and the construction period is shortened. When the temperature is lower than 0 °C, the freezing of concrete mixing water at negative temperature will not only stagnate the hydration of cement, but also cause the water to freeze. Volume expansion will cause damage to the structure of concrete hydration products. Therefore, adding antifreeze to negative temperature concrete for antifreeze is a common technical method for concrete negative temperature construction in winter. [0003] Traditional antifreezes mos...

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Problems solved by technology

[0003] Traditional antifreeze agents mostly use nitrate and nitrite salts as antifreeze components, and the dosage is as high as 6-9% at a low temperature of -15°C. The high alkali content can easily lead to adverse effects such as alkali-aggregate reaction and alkali return in concrete. Phenomenon, affecting use and quality