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Mineral admixture for concrete and preparation method thereof

A technology of mineral admixture and production method, which is applied in the field of mineral admixture for concrete and its production, can solve the problems of high water content, easy environmental pollution, unstable quality, etc., and achieves the effects of good performance and cost reduction.

Active Publication Date: 2017-11-21
湖南双友特材有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fly ash is a by-product of thermal power plants. Its quality is very unstable and its water content is high. 20% of it cannot be pumped out in the tanker. The fineness and loss on ignition are high, which seriously affects the quality of concrete.
Moreover, the state encourages the development of new energy sources, hydropower, nuclear power, wind power, and photovoltaics supplement electricity in large quantities. Thermal power will gradually withdraw from the energy market, and the output of thermal power fly ash will gradually decrease or even withdraw from the market. However, there is no new supply of fly ash. Production Method
In addition, construction waste generated during building demolition, converter slag generated from steel plants, silicon crushed stone generated from silicon ore collection, and coal gangue generated from coal mining are usually treated as solid waste, which wastes resources and easily pollutes the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Get 20 kilograms of burnt coal gangue, 60 kilograms of converter slag, 10 kilograms of silicon crushed stone and 10 kilograms of construction waste (100 kilograms in total), wherein the content of silicon in the silicon crushed stone is more than or equal to 90%; the construction waste is Cement construction waste. Construction waste can be demolished concrete columns, concrete blocks, concrete walls, concrete pavement, cement bricks, cement tiles and red bricks, etc.

[0025] The burnt coal gangue and construction waste are broken into pieces with a particle size of ≤40mm, and the silica crushed stone is dried and broken into pieces with a particle size of ≤50mm; the converter slag is dried to a moisture content of ≤2%; Gangue, converter slag, silica crushed stone and construction waste are mixed, first crushed by a roller mill, then ground into powder by a ball mill, and then subjected to winnowing to obtain a powder-like mineral admixture. The fineness of the minera...

Embodiment 2

[0028] Get 30 kilograms of burnt coal gangue, 10 kilograms of converter slag, 40 kilograms of silicon crushed stone and 20 kilograms of construction waste (100 kilograms in total), wherein the content of silicon in the silicon crushed stone is ≥ 90%; the construction waste is Cement construction waste. Construction waste can be demolished concrete columns, concrete blocks, concrete walls, concrete pavement, cement bricks, cement tiles and red bricks, etc.

[0029] The burnt coal gangue and construction waste are broken into pieces with a particle size of ≤40mm, and the silica crushed stone is dried and broken into pieces with a particle size of ≤50mm; the converter slag is dried to a moisture content of ≤2%; Gangue, converter slag, silica crushed stone and construction waste are mixed, first crushed by a roller mill, then ground into powder by a ball mill, and then subjected to winnowing to obtain a powder-like mineral admixture. The fineness of the mineral admixture is: the ...

Embodiment 3

[0032] Get 20 kilograms of burnt coal gangue, 40 kilograms of converter slag, 30 kilograms of silicon crushed stone and 10 kilograms of construction waste (100 kilograms in total), wherein the content of silicon in the silicon crushed stone is more than or equal to 90%; the construction waste is Cement construction waste. Construction waste can be demolished concrete columns, concrete blocks, concrete walls, concrete pavement, cement bricks, cement tiles and red bricks, etc.

[0033] The burnt coal gangue and construction waste are broken into pieces with a particle size of ≤40mm, and the silica crushed stone is dried and broken into pieces with a particle size of ≤50mm; the converter slag is dried to a moisture content of ≤2%; Gangue, converter slag, silica crushed stone and construction waste are mixed, first crushed by a roller mill, then ground into powder by a ball mill, and then subjected to winnowing to obtain a powder-like mineral admixture. The fineness of the minera...

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Abstract

The invention discloses a concrete mineral admixture II-level composite fly ash and a preparation method thereof. The preparation method comprises the following specific steps: mixing 20-30 parts of burnt-through coal gangue, 10-60 parts of converter slag, 10-40 parts of silicon rubble and 10-20 parts of construction waste all by weight, breaking and grinding into powder composite fly ash, wherein the fineness of the composite fly ash is as follows: the weight of screen residue in a 45-micron square hole sieve is lower than or equal to 23%; the silicon content in the silicon rubble is higher than or equal to 90%; and the construction waste is cement construction waste. In the invention, the production technology is simple, and the cost is low; common solid wastes such as construction waste, converter slag, burnt-through coal gangue and silicon rubble are adopted as main materials; the obtained mineral admixture II-level composite fly ash can replace some high-strength cement and mineral powder in concrete; and the early strength and later strength of the concrete are effectively improved, and the bending resistance, leakage resistance, corrosion / radiation resistance and durability of the concrete are enhanced.

Description

technical field [0001] The invention belongs to the field of solid waste, in particular to a mineral admixture for concrete and a preparation method thereof. Background technique [0002] Glossary: [0003] Converter slag, that is, converter steel slag is the waste slag produced in the process of converter steelmaking. It mainly comes from the oxides formed after the oxidation of elements contained in molten iron and scrap steel, the impurities brought in by the metal charge, and the added slagging agents (such as limestone, fluorescein, etc.) Stone, silica), oxidant, desulfurization products and eroded lining materials mainly contain CaO, SiO 2 、Al 2 o 3 , MgO, Fe2O3, MnO, P 2 o 5 And f-CaO (free calcium oxide) and so on. [0004] Silica crushed stone is the slag in the collection of silicon ore, and the silicon content is above 90%. [0005] Coal gangue is solid waste discharged during the coal mining process and coal washing process. It is a black-gray rock with lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B18/30C04B20/02
CPCY02W30/91
Inventor 李友和杨亚丽黄秉乾胡胤鹏
Owner 湖南双友特材有限责任公司