Iron tailings mixing sand concrete

A technology of iron tailings ultra-fine sand and mixed sand, which is applied in the field of high-strength concrete and concrete preparation, can solve the problem that the utilization rate of iron tailings is less than 5%, and achieve improved pore size and distribution, good water retention, and cost reduction Effect

Inactive Publication Date: 2016-01-13
CHINA MCC17 GRP
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Problems solved by technology

The production process of construction sand is to screen out the coarse particles in the iron tailings as construction sand, and then discharge the remaining fine particles into the tailings pond. Since the particle size of iron tailings is mostly below 1mm, it is suitable for construction There are very few coarse particles in the medium sand range, and most of the iron tailings still have to be discharged into the tailings pond for storage. Currently, the utilization rate of iron tailings is less than 5%.

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Embodiment Construction

[0015] An iron tailings mixed sand concrete, the iron tailings mixed sand concrete is composed of 52.5 grade cement, iron tailings mixed sand, gravel, admixture, polycarboxylate superplasticizer and water, the iron tailings The mass percent of each component of ore-mixed sand concrete is: the 52.5 grade cement 16%-20%, the iron tailings mixed sand 22%-27%, the crushed stone 45%-48%, the blended 5.5% to 6.5% of the raw material, 7.3% to 8.1% of the water, and 0.2% to 0.3% of the polycarboxylate superplasticizer.

[0016] The fineness modulus of the iron tailings mixed sand is 2.5-2.8, and the mass percentage of stone powder in the iron tailings mixed sand is 2.0%-5.0%.

[0017] The iron tailings mixed sand is composed of iron tailings superfine sand and machine-made sand, the fineness modulus of the iron tailings superfine sand is 0.8-1.4, and the mass percentage of stone powder in the iron tailings superfine sand is The fineness modulus of the machine-made sand is 3.1-3.5, an...

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Abstract

The present invention discloses an iron tailings mixing sand concrete, which comprises, by mass, 16-20% of 52.5-grade cement, 22-27% of iron tailings mixing sand, 45-48% of crushed stone, 5.5-6.5% of an admixture, 7.3-8.1% of water, and 0.2-0.3% of a polycarboxylic acid efficient water reducer. The iron tailings mixing sand concrete of the present invention has characteristics of good water retention property, easy vibration molding, and good workability.

Description

technical field [0001] The invention relates to concrete preparation, in particular to high-strength concrete prepared by mixing sand composed of ultra-fine iron tailings and machine-made sand as fine aggregate, and belongs to the technical field of comprehensive utilization of iron tailings resources. Background technique [0002] At present, the amount of sand used in my country is increasing year by year, and long-term mining has led to the gradual depletion of natural sand resources, so it is urgent to find suitable sand substitute materials. Iron tailings are mostly ultra-fine sand, which has the characteristics of large specific surface area and large stone powder content. It is not suitable to be used as fine aggregate alone to prepare iron tailings concrete; iron tailings are now mainly used to produce construction sand. The production process of construction sand is to screen out the coarse particles in the iron tailings as construction sand, and then discharge the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/02C04B18/12C04B18/14
CPCY02W30/91
Inventor 何兆芳尹万云金仁才
Owner CHINA MCC17 GRP
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