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Method for preparing low-clinker and high-phosphorus-slag cement composite cementitious material

A technology of composite cementitious materials and composite admixtures, applied in the direction of cement production, etc., can solve the problems of polluted land and water bodies, long setting time, low early strength, etc., and achieve high utilization rate, short setting time and high early strength Effect

Inactive Publication Date: 2017-07-25
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Stacking so much phosphorus slag will not only occupy a large amount of arable land, but also pollute the land and water bodies, posing a serious threat to the environment
[0005] However, because phosphorus slag is used as the main raw material, there are two adverse effects, the setting time is too long and the early strength is too low

Method used

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  • Method for preparing low-clinker and high-phosphorus-slag cement composite cementitious material
  • Method for preparing low-clinker and high-phosphorus-slag cement composite cementitious material
  • Method for preparing low-clinker and high-phosphorus-slag cement composite cementitious material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The raw material components of low clinker and high phosphorus slag cement composite cementitious material are: 30% clinker, 40% phosphorus slag, 30% composite admixture, wherein the composite admixture includes 5% steel slag, 10% fly ash, 10% % limestone, 5% gypsum.

[0040] The raw materials are mechanically mixed according to the predetermined proportion, and after mixing evenly, water is added according to the water-cement ratio of 0.5, and stirred in a mortar mixer for 2 minutes, and the cement composite cementitious material with low clinker and high phosphorus slag is obtained after completion.

[0041] Test results: The compressive strength of the cement composite cementitious material with low clinker and high phosphorus slag was 2.0MPa, 4.4MPa, and 18.0MPa at 3d, 7d, and 28d, respectively, and the initial setting and final setting times were 398min and 557min, respectively.

Embodiment 2

[0043] The raw material components of low clinker and high phosphorus slag cement composite cementitious material are: 25% clinker, 40% phosphorus slag, 5% metakaolin, 30% composite admixture, wherein the composite admixture includes 5% steel slag, 10% Fly ash, 10% limestone, 5% gypsum.

[0044] The raw materials are mechanically mixed according to the predetermined proportion, and after mixing evenly, water is added according to the water-cement ratio of 0.5, and stirred in a mortar mixer for 2 minutes, and the cement composite cementitious material with low clinker and high phosphorus slag is obtained after completion.

[0045] Test results: the compressive strengths of cement composite cementitious materials with low clinker and high phosphorus slag at 3d, 7d, and 28d are 2.4MPa, 5.4MPa, and 20.9MPa respectively, which are higher than those obtained in Example 1 without metakaolin mixed with samples 3d, 7d, and 28d The compressive strength increased by 16.7%, 18.5%, and 13....

Embodiment 3

[0047] The raw material components of low clinker and high phosphorus slag cement composite cementitious material are: 20% clinker, 40% phosphorus slag, 10% metakaolin, 30% composite admixture, wherein the composite admixture includes 5% steel slag, 10% Fly ash, 10% limestone, 5% gypsum.

[0048] The raw materials are mechanically mixed according to the predetermined proportion, and after mixing evenly, water is added according to the water-cement ratio of 0.5, and stirred in a mortar mixer for 2 minutes, and the cement composite cementitious material with low clinker and high phosphorus slag is obtained after completion.

[0049] Test results: the compressive strength of the cement composite cementitious material with low clinker and high phosphorus slag at 3d, 7d, and 28d is 2.5MPa, 5.9MPa, and 22.2MPa respectively. The compressive strength of metakaolin samples increased by 20.0%, 25.4%, and 18.9% respectively at 3d, 7d, and 28d; Shorten 49min, 79min.

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Abstract

The invention discloses a method for preparing a low-clinker and high-phosphorus-slag cement composite cementitious material. The method comprises the following steps: weighing 15-25% by mass of clinker, 40% by mass of phosphorus slag, 5-15% by mass of metakaolin, and 30% by mass of compound admixture consisting of steel slag, fly ash, limestone and gypsum according to a mass ratio of 5 to 10 to 10 to 5; and mechanically mixing, adding water according to a water cement ratio of 0.5 after uniformly mixing, and stirring for 2min to obtain the low-clinker and high-phosphorus-slag cement composite cementitious material. By adding the metakaolin, the problems that the low-clinker and high-phosphorus-slag cement composite cementitious material has lower early strength and longer setting time are solved, and the optimum added quantity of the metakaolin is obtained and is between 5% and 15%. The preparation method provided by the invention is simple, the clinker quantity can be reduced, other industrial wastes such as phosphorus slag can be more fully utilized, the environmental pollution is reduced and the energy saving and emission reduction are realized.

Description

technical field [0001] The invention relates to a preparation method of a low-clinker high-phosphorus slag cement composite cementitious material. Background technique [0002] With the continuous development of my country's industrialization and urbanization, the demand for energy resources is increasing day by day, the phenomenon of energy shortage is gradually highlighted, and the phenomenon of waste of fossil energy such as oil and natural gas is prominent, which has seriously restricted my country's economic and social development. It is of great practical significance to solve the excessive burden of energy consumption in our country and build a resource-saving society. [0003] Low clinker cementitious material refers to reducing the clinker cement composition in the cementitious material, increasing the amount of other mixed materials, and applying good preparation technology to prepare the cementitious material to reduce environmental pollution. To some extent, low-...

Claims

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Application Information

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IPC IPC(8): C04B7/26
CPCC04B7/26Y02P40/10
Inventor 朱教群谢孟辉周卫兵李儒光刘凤利
Owner WUHAN UNIV OF TECH
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