Recycled concrete and preparation method thereof

A technology of recycled concrete and recycled coarse aggregate, applied in the field of concrete, can solve the problems of low compressive strength of recycled concrete, achieve the effects of improving the rheological properties of concrete, improving the resistance to sulfate corrosion, and improving the resistance to magnesium salt corrosion

Inactive Publication Date: 2018-11-09
禹州市国泰建工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the demolition of old buildings, municipal infrastructure renovation and other projects will produce a large amount of construction waste, in order to save resources and protect the environment, the concept of "recycled concrete" is proposed; recycled concrete is the concrete that uses recycled aggregate as part of the raw material configuration ; But the outer surface or inside of the recycled aggregate will produce small cracks and voids, so that the compressive strength of recycled concrete is lower than that of ordinary concrete; therefore, for practical needs, a recycled concrete and its preparation method are needed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A recycled concrete, characterized in that it includes the following components in parts by weight: 60-95 parts of water; 40-64 parts of cement; 38-62 parts of mineral powder; 22-34 parts of fly ash; 280-350 parts of natural sand 210~260 parts of recycled coarse aggregate; 70~120 parts of recycled fine aggregate; 6~8 parts of silicon powder; 1~2 parts of modified polyacrylic acid superplasticizer.

[0023] Beneficial effects of the present invention: the present invention provides a recycled concrete and its preparation method. Regenerated coarse aggregate and recycled fine aggregate are made of construction waste, which has the advantage of environmental protection; the present invention uses fly ash and mineral powder to replace part Adding fly ash and mineral powder can improve the fluidity, cohesion and water retention of concrete, make the concrete mixture easy to pump and pour, and reduce the loss of slump over time; and fly ash The heat of hydration with mineral ...

Embodiment 2

[0025] A recycled concrete, characterized in that it includes the following components in parts by weight: 60-95 parts of water; 40-64 parts of cement; 38-62 parts of mineral powder; 22-34 parts of fly ash; 280-350 parts of natural sand 210~260 parts of recycled coarse aggregate; 70~120 parts of recycled fine aggregate; 6~8 parts of silicon powder; 1~2 parts of modified polyacrylic acid superplasticizer.

[0026] The preparation method of described modified polyacrylic acid superplasticizer is:

[0027] a. First, replace 30% sodium methacrylsulfonate with 3 parts of acrylic acid with a concentration of 0.1mol / l and 2 parts of 2-acrylamide-2-methylpropenesulfonic acid with a concentration of 0.1mol / l to form a mixed monomer aqueous solution;

[0028] b. the initiator ammonium persulfate is configured as 4 parts of solutions with a concentration of 0.001mol / l;

[0029] c. Add water, sodium methacrylsulfonate and 2-acrylamide-2-methylpropanesulfonic acid into the reaction kettl...

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Abstract

The invention discloses a recycled concrete, which is characterized in that the recycled concrete is prepared from the following components by weight: 60~95 parts of water, 40~64 parts of cement, 38~62 parts of ore powder, 22~34 parts of fly ash, 280~350 parts of natural sand, 210~260 parts of recycled coarse aggregate, 70~120 parts of recycled fine aggregate, 6~8 parts of silicon powder, and 1~2parts of modified polyacrylic acid high-efficiency water reducing agent. In conclusion, the recycled concrete has the advantages of improving the compressive property of concrete and improving the rheological property, mechanical property, volume stability and durability of concrete.

Description

technical field [0001] The invention belongs to the technical field of concrete, and in particular relates to recycled concrete and a preparation method thereof. Background technique [0002] With the demolition of old buildings, municipal infrastructure renovation and other projects will produce a large amount of construction waste, in order to save resources and protect the environment, the concept of "recycled concrete" is proposed; recycled concrete is the concrete that uses recycled aggregate as part of the raw material configuration ; But the outer surface or inside of the recycled aggregate will produce fine cracks and voids, so that the compressive strength of recycled concrete is lower than that of ordinary concrete; therefore, for practical needs, a recycled concrete and its preparation method are needed. Contents of the invention [0003] The object of the present invention is to overcome the deficiencies of the prior art, and provide a kind of regenerated concr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00
CPCC04B28/00C04B14/02C04B18/08C04B14/068C04B18/16C04B18/146C04B24/163
Inventor 李涛石晓峰张帅军
Owner 禹州市国泰建工科技有限公司
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