Hydration heat suppression type expansion fiber composite anti-cracking agent and preparation method thereof

Abstract

The invention discloses a hydration heat suppression type expansion fiber composite anti-cracking agent, which comprises, by mass, 93.5%-98% of an expansion component, 1.5-6% of a hydration heat suppression component, and 0.5-1.5% of basalt fiber, wherein the expansion component is prepared by compounding a light burning magnesium-based expansion agent and a calcium-based expansion agent accordingto a mass ratio of 1:10-10:1, and the hydration heat suppression component is prepared by compounding an ester compound and a retarder according to a mass ratio of 1:1-5:1. The preparation method ofthe hydration heat suppression type expansion fiber composite anti-cracking agent comprises: pre-mixing the light burning magnesium-based expansion agent, the calcium-based expansion agent and the basalt fiber, adding the hydration heat suppression component, and completely mixing. According to the present invention, the prepared hydration heat suppression type expansion fiber composite anti-cracking agent can effectively reduce the temperature increase of the concrete hydration reaction, and can compensate the shrinkage from the early stage and the middle-late stages of the concrete so as tosignificantly reduce the temperature crack of the concrete and enhance the crack resistance of the concrete; and the preparation method is simple, can be widely applied, and has the production cost.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a hydration heat-inhibiting expansion fiber composite anti-cracking agent and a preparation method thereof. Background technique [0002] The early volume change of concrete is an important factor causing concrete cracking, mainly including chemical shrinkage, autogenous shrinkage, drying shrinkage and cooling shrinkage of cementitious materials. In order to reduce the risk of concrete cracking, the engineering community has explored technical approaches to compensate concrete shrinkage (especially temperature drop shrinkage) and restrain concrete temperature rise from different perspectives such as technology and materials, such as adding inert admixtures, using cooling water for mixing, and reducing the amount of raw materials. Temperature, expansion agent and other measures. [0003] At present, in general industrial and civil construction projects, most of the high-performa...

AI Technical Summary

Problems solved by technology

Although this method can reduce the peak value of hydration heat release rate, it can also compensate concrete shrinkage to a cert

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