Hydration heat suppression type 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 peak hydration heat release rates, so as to increase crack resistance and improve Anti-cracking performance, the effect of reducing temperature rise

Active Publication Date: 2019-02-01
贵州鼎盛建材实业有限公司
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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 cert

Method used

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  • Hydration heat suppression type expansion fiber composite anti-cracking agent and preparation method thereof
  • Hydration heat suppression type expansion fiber composite anti-cracking agent and preparation method thereof
  • Hydration heat suppression type 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 at 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, which is relatively 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 ba...

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 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...

Claims

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Application Information

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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 贵州鼎盛建材实业有限公司
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