Hydrated calcium silicate as well as preparation method thereof and concrete anti-freeze agent containing the same

Abstract

The invention relates to a calcium silicate hydrate and a preparation method thereof and concrete antifreezing agent containing the calcium silicate hydrate, which pertains to the field of construction materials and manufacturing method thereof. The invention solves the problems of antifreezing agent in existing market of poor durability of concrete, steel-bar corrosion, alkaline aggregate reaction, etc., caused by large quantity of salt content in the concrete antifreezing agent. The calcium silicate hydrate is made from calcareous material, siliceous material and water. The preparation method comprises the steps that: the calcareous material and the siliceous material are evenly mixed and grinded and added with water to prepare pasty material, which goes through heat reaction at 1 to 3atm for 2 to 5h. The concrete antifreezing agent containing the calcium silicate hydrate is made of the calcium silicate hydrate, antifreezing components, water reducing components, air entraining components and fly ash. The calcium silicate hydrate uses seed crystal hydration to improve the hydration of the concrete, which leads set cement to be more impact and the long-term property of the concrete not to be reduced. The antifreezing agent of the invention does not contain chloride salts, reduces the damage effect of the steel-bar corrosion caused by mixing the chloride salts with the concrete when in construction during winter period and greatly reduces the salt content in the concrete.

Description

technical field [0001] The invention belongs to the field of building materials and manufacturing methods thereof, and in particular relates to calcium silicate hydrate, a preparation method thereof and a concrete antifreeze agent containing calcium silicate hydrate. Background technique [0002] Concrete is the main building structure material at present, and its composition is: cement + sand + stone + mineral admixture. In addition, concrete antifreeze must be added in order to hydrate the cement at negative temperatures during winter construction. On the one hand, the function of antifreeze is to produce liquid water at negative temperature to hydrate the cement, and on the other hand, it must have early strength components to promote the early formation of cement stone structure. The formation of the early structure allows liquid water to enter the pores to lower the freezing point, and at the same time, the formation of the structure is conducive to the further develop...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of poor concrete durability, steel bar corrosion and alkali-aggregate reaction caused by the high salt content in the concrete antifreeze agent, and provides a calcium silicate hydrate and its preparation method and hydrated silicic acid Calci