Anti-compression and anti-permeation iron tailing concrete and preparation method thereof

A technology for iron tailings and concrete is applied in the field of concrete, which can solve the problems such as the lack of research on impermeability and microscopic characteristics, and achieve the effects of alleviating the problem of land occupation and storage of tailings, improving the compressive strength and improving the comprehensive utilization rate.

Active Publication Date: 2019-05-31
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the experimental research on iron tailings concrete at home and abroad mainly focuses on the mechanical properties, and there are few studies on the anti-seepage performance and microscopic characteristics.

Method used

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  • Anti-compression and anti-permeation iron tailing concrete and preparation method thereof
  • Anti-compression and anti-permeation iron tailing concrete and preparation method thereof
  • Anti-compression and anti-permeation iron tailing concrete and preparation method thereof

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preparation example Construction

[0034] A kind of preparation method of compressive and impermeable iron tailings concrete of the present invention comprises the following steps:

[0035] Step 1: Crush the iron tailings to make a specific surface area of ​​340m 2 / kg, iron tailings powder with a fineness of 200-400 mesh;

[0036] Step 2: Weigh according to the following mass percentages: 60%-80% of iron tailings powder, 15%-25% of cement, and 5%-15% of water. After mixing iron tailings powder, cement and water, adopt centrifugal molding process and Iron tailings balls with a particle size of 5-16mm are made through natural conservation;

[0037] Step 3: Weigh according to the following mass percentages: 14%-17% of cement, 42%-52% of iron tailings balls, 28%-34% of iron tailings powder, 0.14%-0.17% of water reducing agent, and 0.28% of admixture ~0.34% and 5.2%~6.3% of water; the mass percentage of each component of the admixture is as follows: calcium oxide 15%~35%, calcium chloride 15%~35%, sodium nitrate ...

Embodiment

[0044] In this embodiment, the anti-compression and anti-permeability iron tailings concrete is prepared from ordinary Portland cement, iron tailings balls, iron tailings powder, water, water reducing agent and admixture; the mass percentage of each component is as follows:

[0045]

[0046]

[0047] Among them, the cement is 42.5# ordinary Portland cement with a density of 3000kg / m 3 ; The specific surface area of ​​iron tailings powder is 340m 2 / kg, the fineness is 200-400 mesh; the particle size of the iron tailings ball is 5-16mm, and it is formed by centrifugation from iron tailings powder, cement and water. Since the tailings ball is made of tailings powder as the main raw material, Therefore, concrete coarse aggregate and fine aggregate have good interfacial bonding ability, which refines the internal pore structure of concrete. The water-reducing agent is a high-efficiency polycarboxylate water-reducing agent, and the maximum water-reducing rate can reach 40%. Th...

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Abstract

The invention relates to an anti-compression and anti-permeation iron tailing concrete and a preparation method thereof. According to the concrete, iron tailing balls replace coarse aggregate of ordinary concrete, iron tailing powder replaces fine aggregate, and an admixture, water and a water reducing agent are blended for preparation, wherein the mass percentages of above components are as follows: 14-17% of cement, 42-52% of iron tailing balls, 28-34% of iron tailing powder, 0.14-0.17% of the water reducing agent, 0.28-0.34% of the admixture, and 5.2% -6.3% of water. Compared with concretemade from other tailings, the iron tailing concrete is characterized in that iron tailings are used for replacing all concrete aggregate, the replacement rate reaches 100%, the recycling rate of the iron tailings is greatly improved, and waste is turned into treasures. The cubic compressive strength of the tailing concrete is effectively improved after the admixture is added, and the anti-air-permeation performance and the anti-chloride-ion- permeation performance are improved.

Description

technical field [0001] The invention belongs to the technical field of concrete, and relates to a compression-resistant and anti-seepage iron tailings concrete and a preparation method thereof. Background technique [0002] With the accelerated development of urbanization in our country, the demand for building materials has increased sharply, and the massive exploitation of natural resources such as natural sand and gravel has seriously damaged the ecological environment, and these resources are not renewable in the short term, making the contradiction of shortage of building resources increasingly prominent. Therefore, it is urgent to find suitable alternative materials. [0003] Tailings are solid wastes discarded by mining enterprises in the process of refining the main raw materials for metallurgy. They are generally stored in tailings ponds. A large amount of tailings not only pollutes the environment, but also occupies land resources. The application of mine tailings...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B111/27
Inventor 李艺邹越杨泽良张铭
Owner NORTHEASTERN UNIV
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