Modified active iron tailing admixture for concrete and preparation method thereof

A technology of active admixture and iron tailings, applied in the field of concrete, can solve problems such as insufficient activity, and achieve the effect of broad application prospects

Active Publication Date: 2013-04-03
北京东方建宇混凝土科学技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is the problem that iron tailings in the prior art must be mixed with fly ash or slag powder to be used as a concrete admixture due to insufficient activity, and then provide a kind of iron tailings that can completely replace slag powder and pulverized coal Ash modified iron tailings active admixture for concrete

Method used

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  • Modified active iron tailing admixture for concrete and preparation method thereof
  • Modified active iron tailing admixture for concrete and preparation method thereof

Examples

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Effect test

Embodiment 1

[0029] Weigh 5000g of SiO 2 Iron tailings with a content of 40wt%~50wt% are mixed evenly with 10g of polycarboxylate with a number average molecular weight of 3000, and then co-milled to obtain a specific surface area of ​​400m 2 / kg of modified iron tailings active admixture A.

Embodiment 2

[0031] Weigh 5000g of SiO 2 Iron tailings with a content of 50wt%~60wt% and an iron content of 10~12wt% are mixed evenly with 15g of polycarboxylate with a number average molecular weight of 4000, and then co-milled to obtain a specific surface area of ​​450m 2 / kg of modified iron tailings active admixture B.

Embodiment 3

[0033] Weigh 5000g of SiO 2 Iron tailings with a content of 60wt%~70wt% and an iron content of 8~10wt% are mixed evenly with 20g of polycarboxylate with a number average molecular weight of 5000, and then co-milled to obtain a specific surface area of ​​500m 2 / kg of modified iron tailings active admixture C.

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Abstract

The invention provides a modified active iron tailing admixture for concrete, which comprises the following elements: iron tailings and polycarboxylate, wherein the dosage of the polycarboxylate is 0.2-0.6wt% based on the mass of the iron tailings, and both the specific surface of the iron tailings and that of the polycarboxylate are 400-600m<2>/kg. Replacing slag powder and pulverized coal ash, the active iron tailing admixture provided by the invention is applied to the concrete and can prepare C10-C100 pump concrete, and the active iron tailing admixture can meet each performance index of build concrete and has a brilliant application prospect in the construction engineering.

Description

technical field [0001] The invention relates to a modified iron tailing active admixture for concrete and a preparation method thereof, belonging to the technical field of concrete. Background technique [0002] Iron tailings are wastes after iron ore crushing (dry magnetic separation), grinding (wet magnetic separation), and iron powder separation. In recent years, with the rapid development of my country's iron and steel industry, the production of 1 ton of iron powder will produce 1.5 tons of iron tailings, and the discharge of iron tailings has increased year by year; at present, China has accumulated tens of billions of iron tailings Tons, occupying a large amount of land, mountains and rivers, while destroying the environment and endangering the ecology. [0003] At present, 30~50% of admixtures are generally used in concrete instead of cement, and various admixtures are used to reduce the cost of concrete and improve performance; among them, the concrete admixtures us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/12
CPCY02W30/91
Inventor 王安岭段遵莉武俊宇
Owner 北京东方建宇混凝土科学技术研究院有限公司
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