Fly ash composite admixture for concrete and preparation method of admixture

A composite admixture, fly ash technology, applied in climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of large slump, large chemical shrinkage and autogenous shrinkage, and high use cost, Achieve the effect of low moisture content, low production cost, energy saving and environmental protection in the production process

Active Publication Date: 2013-12-11
SHUOZHOU JUGUANG BUILDING MATERIAL DEV CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the technical difficulties of existing mineral admixtures such as too large slump, large chemical shrinkage and autogenous shrinkage, and high cost of use, and to provide a mineral admixture with low environmental pollution and low production cost. Fly ash composite admixture for concrete and preparation method thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The fly ash composite admixture for concrete in this embodiment is prepared from slag, stone chips, fly ash and desulfurized gypsum as raw materials, and the weight percentage of said slag, stone chips, fly ash and desulfurized gypsum It is: 23% slag, 15% stone chips, 58% fly ash and 4% desulfurized gypsum.

[0019] The preparation method of the above-mentioned fly ash composite admixture for concrete comprises the following steps: first, the fly ash with a weight percentage of 58% is pulverized by a ball mill into a particle size of D 50 =9.24μm ultra-fine fly ash, then mix 23% by weight of slag, 15% by weight of stone chips and 4% by weight of desulfurized gypsum and ball mill into powder, and finally ultrafine powder Coal ash is mixed with ball-milled powder and homogenized to make concrete fly ash composite admixture.

[0020] Al in the above fly ash 2 o 3 Content ≥ 20%, the Al in the slag 2 o 3 Content ≥ 20%, the SO in the desulfurization gypsum 3 Content ≥ 3...

Embodiment 2

[0023] The fly ash composite admixture for concrete in this embodiment is prepared from slag, stone chips, fly ash and desulfurized gypsum as raw materials, and the weight percentage of said slag, stone chips, fly ash and desulfurized gypsum It is: 30% slag, 4% stone chips, 65% fly ash and 1% desulfurized gypsum.

[0024] The preparation method of the above-mentioned fly ash composite admixture for concrete comprises the following steps: first, the fly ash with a weight percentage of 65% is pulverized by a ball mill into a particle size of D 50 =7.84μm ultra-fine fly ash, then mix 30% by weight of slag, 4% by weight of stone chips and 1% by weight of desulfurized gypsum and ball mill into powder, and finally the ultrafine powder Coal ash is mixed with ball-milled powder and homogenized to make concrete fly ash composite admixture.

[0025] Al in the above fly ash 2 o 3 Content ≥ 20%, the Al in the slag 2 o 3 Content ≥ 20%, the SO in the desulfurization gypsum 3 Content ≥...

Embodiment 3

[0028] The fly ash composite admixture for concrete in this embodiment is prepared from slag, stone chips, fly ash and desulfurized gypsum as raw materials, and the weight percentage of said slag, stone chips, fly ash and desulfurized gypsum It is: 21% slag, 5% stone chips, 73% fly ash and 1% desulfurized gypsum.

[0029] The preparation method of the above-mentioned fly ash composite admixture for concrete comprises the following steps: first, the fly ash with a weight percentage of 73% is pulverized into a particle size of D 50 =6.70μm ultra-fine fly ash, then mix 21% by weight of slag, 5% by weight of stone chips and 1% by weight of desulfurized gypsum and ball mill into powder, and finally the ultrafine powder Coal ash is mixed with ball-milled powder and homogenized to make concrete fly ash composite admixture.

[0030] The content of Al2O3 in the fly ash is ≥ 20%, the content of Al2O3 in the slag is ≥ 20%, the content of SO3 in the desulfurized gypsum is ≥ 30%, and the ...

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Abstract

The invention relates to a fly ash composite admixture for concrete, and a preparation method of the admixture, and belongs to a building material for building, and a preparation method of the building material. The fly ash composite admixture and the preparation method mainly solve the technical problems that the existing mineral admixture is too large in slump, larger in chemical shrinkage and self-shrinkage, and high in use cost. The fly ash composite admixture for the concrete adopts the technical scheme that the fly ash composite admixture is prepared by taking 20-30wt% of slag, 4-15wt% of stone chips, 58-73wt% of fly ash and 1-4wt% of desulphurization gypsum as raw materials. The preparation method comprises the following steps that the fly ash is smashed into ultrafine fly ash by ultrafine smashing equipment; the slag, the stone chips and the desulphurization gypsum are mixed uniformly and ball-milled into powder; the ultrafine fly ash and the ball-milled powder are mixed and homogenized; and the fly ash composite admixture for the concrete is prepared.

Description

technical field [0001] The invention relates to a fly ash composite admixture for concrete and a preparation method thereof, which belongs to building materials for construction and a preparation method thereof. Background technique [0002] With the development of modern concrete technology, the diversification of concrete components has become a trend. In addition to cement, coarse and fine aggregates and water, modern concrete also includes two important admixtures, one is chemical admixtures represented by new high-efficiency water reducers and retarders, and the other is ground slag Mineral admixtures represented by powder, fly ash, etc. [0003] GB / T18736-2002 "Mineral Admixtures for High-Strength and High-Performance Concrete" clearly stipulates that various finely ground mineral admixtures added to improve the durability of concrete, also known as mineral admixtures, are mainly characterized by finely ground Mineral materials, finer than cement particles, are mainl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/14C04B18/30
CPCY02W30/91
Inventor 牛勇马存堂于日江武建芳李鹏
Owner SHUOZHOU JUGUANG BUILDING MATERIAL DEV CO LTD
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