Heat of hydration inhibiting expansion fiber composite anti-cracking agent and preparation method thereof

Abstract

The invention discloses a heat of hydration inhibiting expansion fiber composite anti-cracking agent, which comprises: 93.5%-98% of expansion components; 1.5%-6% of hydration heat inhibiting components; and 0.5%-1.5% of basalt fibers. %; Among them, the expansion component is composed of light-burned magnesia expansion agent and calcium expansion agent in a mass ratio of 1:10 to 10:1; the hydration heat suppression component is an ester compound and a retarder in a mass ratio of 1 : 1 ~ 5: 1 compound; the preparation method of the heat of hydration inhibiting expansion fiber composite anti-cracking agent is to pre-mix the light-burned magnesia expansion agent, calcium expansion agent and basalt fiber before adding water The heat suppression components were mixed thoroughly. The heat of hydration inhibiting expansion fiber composite anti-cracking agent of the present invention can effectively reduce the temperature rise of concrete hydration reaction, and can compensate the shrinkage of concrete from the early and middle stages, significantly reduce the temperature cracks of concrete, and enhance the crack resistance of concrete; And the preparation method is simple, can be popularized and applied on a large scale, and the production cost is low.

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 certain extent, but its early effective compensation of concrete is low, which is not conducive to preventing early cracks in concrete

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