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

A heat-of-hydration suppression and fiber-expanding technology, which is applied in the field of building materials, can solve problems such as unfavorable prevention of early cracks in concrete, low early effective compensation of concrete, and reduction of the peak value of hydration heat release rate, so as to increase crack resistance and improve Anti-crack performance, effect of reducing temperature rise

Active Publication Date: 2021-11-12
南阳洛兴建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A hydration heat-inhibiting expansion fiber composite anti-cracking agent comprises: 95% of an expansion component; 3.5% of a hydration heat-inhibiting component; and 1.5% of a basalt fiber.

[0037] Among them, the expansion component is composed of a light-burned magnesia expansion agent and a calcium expansion agent according to a mass ratio of 10:1. The MgO content in the light-burnt magnesia expansion agent is 82.7wt%, and the hydration activity value t is 60s. Surface area is 320m 2 / kg, the 1.18mm sieve residue is 0.3%; the calcium expansion agent is a calcium oxide-calcium sulfoaluminate composite expansion agent, and the content of free calcium oxide (f-CaO) in the calcium expansion agent is 47.72wt%, and the specific surface area is 265m 2 / kg, 1.18mm sieve is 0.6%.

[0038]The heat of hydration inhibitor component is composed of methyl stearate and sodium hexametaphosphate in a mass ratio of 3:1.

[0039] The nominal diameter of monofilament of basalt fiber...

Embodiment 2

[0045] This example is basically the same as Example 1, except that the expansion component is composed of a light-burned magnesia expansion agent and a calcium expansion agent at a mass ratio of 3:1, and the MgO content in the light-burned magnesia expansion agent 82.2wt%, the hydration activity value t is 100s, and the specific surface area is 340m 2 / kg, 1.18mm sieve is 0.2%.

Embodiment 3

[0047] This example is basically the same as Example 1, except that the expansion component is composed of a light-burned magnesia expansion agent and a calcium expansion agent at a mass ratio of 1:3, and the MgO content in the light-burned magnesia expansion agent 80.2wt%, the hydration activity value t is 160s, and the specific surface area is 330m 2 / kg, 1.18mm sieve is 0.2%.

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/08
CPCC04B40/0039C04B14/46C04B22/066C04B22/064C04B22/148C04B22/16C04B24/085
Inventor 管军军张晓果姜文王健雷浩祺姜雷王翔
Owner 南阳洛兴建材有限公司
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