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Steel slag coal ash self-cementing material

A technology of fly ash and steel slag, which is applied in the field of building materials, can solve the problems of not fully utilizing the hydraulic activity of steel slag, the actual utilization rate is less than 10%, and affecting the comprehensive utilization of steel slag, and achieves low cost, stable strength growth, and project saving The effect of cost

Inactive Publication Date: 2008-02-13
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because steel slag contains a large amount of f-CaO and a certain amount of Fe, its stability and wearability are poor, which greatly affects the comprehensive utilization of steel slag
Although there are many studies on the application of steel slag in cement production, the actual utilization rate is still less than 10%. At present, steel slag is widely used in filling projects, and the research on using cement, lime or lime fly ash to stabilize steel slag as pavement base material is in the domestic market. However, these studies have not fully utilized the hydraulic activity of steel slag itself, and all need to be mixed with a certain amount of cement or lime and other cementitious materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Steel slag and fly ash self-consolidating material, which is made of steel slag, fly ash and yellow gypsum. The mass percentage of steel slag, fly ash and yellow gypsum in yellow gypsum is 5.0%. The mass percentage of steel slag, fly ash and yellow gypsum is 95.0%, and the mass ratio of steel slag to fly ash is 1:1; the steel slag fly ash self-consolidating material is obtained by stirring and mixing.

[0016] Steel slag fly ash self-consolidating material is mixed with water, the amount of water added is 19% of the mass of steel slag fly ash self-consolidating material, and the maximum dry density is 1.56g / cm 3 , when the degree of compaction is 97%, the 7-day strength is 1.95MPa, and the 28-day strength is 8.14MPa, which meets the strength requirements of high-grade highway pavement base materials and the strength requirements of No. 50 building bricks.

Embodiment 2

[0018] Steel slag and fly ash self-consolidating material, which is made by mixing steel slag, fly ash and fluorogypsum raw materials. The mass percentage of steel slag, fly ash and fluorogypsum is 97.5%, and the mass ratio of steel slag to fly ash is 1:2; the steel slag fly ash self-consolidating material is obtained by stirring and mixing.

[0019] Steel slag fly ash self-consolidating material is mixed with water, the amount of water added is 24% of the mass of steel slag fly ash self-consolidating material, and the maximum dry density is 1.48g / cm 3 , when the degree of compaction is 97%, the 7-day strength is 1.67MPa, and the 28-day strength is 5.98MPa, which meets the strength requirements of highway pavement base materials.

Embodiment 3

[0021] Steel slag fly ash self-consolidating material, which is made of steel slag, fly ash and desulfurized gypsum raw materials. The mass percentage of steel slag, fly ash and desulfurized gypsum is 96.5%, and the mass ratio of steel slag to fly ash is 3:2; the steel slag fly ash self-consolidating material is obtained by stirring and mixing.

[0022] Steel slag fly ash self-consolidating material is mixed with water, the amount of water added is 16% of the mass of steel slag fly ash self-consolidating material, and the maximum dry density is 1.68g / cm 3 , when the degree of compaction is 97%, the 7-day strength is 1.92MPa, and the 28-day strength is 7.87MPa, which meets the strength requirements of high-grade highway pavement base materials and the strength requirements of No. 50 building bricks.

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Abstract

The present invention belongs to a building material, in particular to a self-concretion material of steel residue powder and coal ash. The self-concretion material of steel residue powder and coal ash is characterized in that: the material is made of the mixing with steel residue, coal ash powder, industrial waste gypsum and alkaline catalyzer; the molar of the industrial waste gypsum is 1-15 percent of the total molar of the steel residue, coal ash powder, industrial waste gypsum and alkaline catalyzer; the molar of the alkaline catalyzer is 0-3 percent of the total molar of the steel residue, coal ash powder, industrial waste gypsum and alkaline catalyzer; the molar ratio between the steel residue and the coal ash powder is 1: 2-4: 1. (The material can not only be used alone, but also be used for stabilizing the road base of detritus and grit and the building brick.) The material is characterized in low cost.

Description

technical field [0001] The invention belongs to building materials, in particular to a steel slag fly ash self-consolidating material. Background technique [0002] The production of steel slag, fly ash, and industrial waste gypsum in my country is large, the comprehensive utilization rate is low, and the economic benefits and technical content of comprehensive utilization are low. Research and development of industrial waste slag comprehensive utilization methods with large slag consumption and high technical and economic indicators It has important economic and environmental benefits. Steel slag is a waste slag generated in large quantities by extracting impurities with slagging agents such as lime or fluorite in the steelmaking industry. High-alkalinity steel slag contains C 2 S, C 3 S, C 4 A and other hydraulic minerals and silicon, aluminum vitreous body, so it has good hydraulic and potential hydraulic. Because steel slag contains a large amount of f-CaO and a certa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B18/08C04B18/14
CPCC04B28/142C04B2103/10C04B2111/0075C04B2111/00103Y02W30/91C04B18/08C04B18/142C04B18/12C04B22/062C04B22/08C04B22/10C04B22/147
Inventor 沈卫国周明凯
Owner WUHAN UNIV OF TECH
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