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C60 concrete prepared by replacing fine aggregate with tailings and preparation method thereof

A technology of concrete and fine aggregate, applied in the field of concrete, can solve the problems of limiting the application range of tailings, unfavorable application of tailings made of sand, hindering the large-scale application of tailings, etc., and achieves the effect of large economic benefits.

Inactive Publication Date: 2019-07-23
河南中建西部建设有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, tailings are mostly used in the production of low-grade concrete at present, which hinders the large-scale application of tailings in concrete production. For example, the Chinese patent with publication number CN106220061A discloses a tailings waste slag to replace fly ash and fine aggregate To prepare concrete, the preparation method is cement: 120~300 parts, mineral powder: 60~210 parts, admixture: 70~225 parts, fine aggregate: 630~900 parts, natural crushed stone: 900~1200 parts parts, water: 150~180 parts, water reducer: 8~15 parts, wherein, the admixture and fine aggregate are machine-made sand formed from tailings waste residue, although the preparation method has the advantages of simple and convenient preparation process, it can be used in To a certain extent, the problem of shortage of natural sand resources and rising prices can be alleviated, but this preparation method is only suitable for concrete with a strength of C20~C40, which limits the application range of tailings in concrete production and is not conducive to the large-scale application of tailings machine-made sand

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A C60 concrete prepared by using tailings instead of fine aggregates, each component and dosage include: cementitious material, coarse aggregate, fine aggregate, tailings, aliphatic high-efficiency water reducer and water, the cementitious material The dosage is 560kg / m³, the mass ratio of water and cementitious material is 0.27, the sand rate is 39%, the dosage of aliphatic superplasticizer is 2.8% of the mass of cementitious material; the maximum particle size of coarse aggregate is 20mm, The amount of coarse aggregate and fine aggregate is calculated according to the mass method, and the fineness modulus of the mixed sand is 3.0. The tailings are used as fine aggregate instead of part of the natural sand for concrete production. The tailings are iron tailings , the gradation of iron tailings is reasonable, the particle shape is better, and the content of needle-like particles is less. The fineness modulus of the iron tailings is 2.2, and the amount of iron tailings is...

Embodiment 2

[0022] The difference between this example and Example 1 is that the amount of the cementitious material is 580kg / m³, the mass ratio of water and the cementitious material is 0.29, the sand rate is 41%, and the aliphatic superplasticizer dosage is The maximum particle size of the coarse aggregate is 18mm, the amount of coarse aggregate and fine aggregate is calculated according to the mass method, and the fineness modulus of the mixed sand is 2.3, and the tailings are replaced by fine aggregate Part of the natural sand is used for the production of concrete. The tailings are iron tailings. The iron tailings have reasonable gradation, good particle shape, and less needle-like particle content. The fineness modulus of the iron tailings is 1.6 , the consumption ratio of iron tailings is 50% of the fine aggregate quality, and the cementitious material includes cement, mineral powder and fly ash, and the described coal ash powder quality is 16% of the cementitious material quality, ...

Embodiment 3

[0030] The difference between this implementation and Example 1 and Example 2 is that the amount of the cementitious material is 570kg / m³, the mass ratio of water to the cementitious material is 0.28, the sand rate is 40%, and the aliphatic high-efficiency water reducer is mixed with The amount is 2.9% of the mass of the cementitious material; the maximum particle size of the coarse aggregate is 16mm, the amount of coarse aggregate and fine aggregate is calculated according to the mass method, and the fineness modulus of the mixed sand is 2.6, and the tailings are used as fine Aggregate replaces part of the natural sand to produce concrete. The tailings are iron tailings. The iron tailings have reasonable gradation, good particle shape, and less needle-like particles. The fineness modulus of the iron tailings is Number is 1.9, the consumption ratio of iron tailings is 43% of fine aggregate quality, and described cementitious material comprises cement, slag powder and fly ash, a...

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Abstract

The invention discloses C60 concrete prepared by replacing fine aggregate with tailings and a preparation method thereof. Application of the tailings to concrete production can be widened due to the success of the preparation method, and the working performance, strength and the like of prepared concrete meet the standard requirements, so that relatively great economic benefits, social benefits and environment benefits are realized.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a C60 concrete prepared by using tailings instead of fine aggregates and a preparation method thereof. Background technique [0002] With the rapid development of social economy, the application of concrete is more and more extensive. At the same time, various raw materials for the production of concrete are also consumed in large quantities. Among them, natural river sand is used as the fine aggregate of concrete. After a long period of time and a large amount of mining Facing the problem of serious shortage, and the mining of natural sand will bring greater harm to the ecological environment. Tailings refer to the part with the lowest useful components in mineral processing operations, that is, solid waste, and my country is a big mining country, which will produce tens of thousands of tailings every year. If these tailings are not fully utilized, they will be destroyed. The w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00
CPCC04B28/00C04B2111/00017C04B2201/50C04B18/08C04B14/02C04B18/12C04B2103/302C04B14/06
Inventor 韦健王军刘军孟书灵牛成功吴跃辉贾亚琼宋姗陈文彬
Owner 河南中建西部建设有限公司