A seed crystal for improving early strength of concrete and its application

Abstract

The invention discloses a crystal seed used for improving concrete early stage strength, and an application thereof. The crystal seed is characterized in that: the crystal seed is prepared from grinded cement stones, wherein the specific surface area of the crushed and grinded crystal seed is 8000 to 15000m<2> / kg. The cement stones are obtained through steps that: a certain amount of inorganic salt is doped into common portland cement, and the mixture is cured for a certain age, such that the cement stones are obtained. The application of the crystal seed comprises steps that: the crystal seed is added to concrete, wherein an adoption amount takes 0.8 to 3% of the mass of the concrete. The crystal seed is an additive with advantages of cheap price, good quality, and environment friendliness. When the crystal seed is added to concrete, early stage strength of concrete is improved, and later stage strength of concrete is ensured. Therefore, durability of concrete is improved.

Description

technical field [0001] The invention relates to a building material, in particular to a crystal seed for improving the early strength of concrete and its application. Background technique [0002] The so-called crystal seed means to form a crystal nucleus by adding an insoluble additive, that is, a seed crystal, to accelerate or promote the growth of enantiomer crystals with the same crystal form or stereo configuration, thereby increasing the early strength. It is a special Early strengthening agent. Crystal seeds have the following functions in concrete. On the one hand, it can reduce the nucleation barrier of hydration products in the early stage of cement hydration, induce rapid hydration of cement, thereby improving the early strength of concrete and speeding up the construction progress of concrete projects; on the other hand , due to the acceleration of the early hydration of cement, it can provide more favorable activity for the mineral admixture to stimulate the ex...

AI Technical Summary

Problems solved by technology

Chloride admixtures, such as sodium chloride and calcium chloride, can improve the early strength of cement, but the presence of chloride ions will corrode steel bars and cause concrete cracking; sulfate admixtures, such as sodium sulfate, can increase The early strength of cement, but too much mixing will cause the concrete to swell and crack in the later stage; organic amine admixtures, such as triethanolamine, must be mixed with other admixtures (sodium chloride, calcium chloride and sulfate), otherwise The effect of early strength is not obvious, and no matter which of the above substances will make the later strength of concrete insufficient, reduce durability and increase concrete production costs

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