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Recycled concrete from construction waste

A technology for recycled concrete and construction waste, applied in the field of concrete, can solve the problems of low bulk density of recycled fine aggregate, affect the impermeability of recycled concrete, rough surface of recycled coarse aggregate, etc., so as to accelerate the hydration speed and prolong the hydration time, the effect of improving the compactness

Active Publication Date: 2021-11-09
BEIJING GAOQIANG CONCRETE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned existing technical solutions have the following defects: the surface of the recycled coarse aggregate obtained from waste bricks is relatively rough, with micro-cracks, there are many pores, and the porosity is relatively large; the packed density of recycled fine aggregate obtained from concrete is small , large porosity, affecting the impermeability of recycled concrete

Method used

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  • Recycled concrete from construction waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A construction waste regenerated concrete. The preparation raw materials include 65 parts of fly ash, 25 parts of stone powder, 350 parts of recycled coarse aggregate, 320 parts of recycled fine aggregate, 28 parts of early strength agent, polycarboxylate 0.5 part of water agent, 3 parts of fatty alcohol sulfonate, 2 parts of reinforcing component, 0.2 part of sodium gluconate; among them, the regenerated coarse aggregate is obtained by crushing and screening waste bricks, and the regenerated fine aggregate is obtained by crushing waste concrete Screened; the early strength agent is a mixture of sodium sulfate and triethanolamine 1:1.5; the reinforcing component is basalt fiber, polypropylene mesh fiber, metakaolin, and CABR-MS605 rust inhibitor 1:1.1:1.2:0.2 mixture.

Embodiment 2

[0041] A construction waste regenerated concrete, prepared according to parts by weight, the preparation raw materials include 74 parts of fly ash, 28 parts of stone powder, 375 parts of recycled coarse aggregate, 345 parts of recycled fine aggregate, 32 parts of early strength agent, polycarboxylic acid reducing 0.9 parts of water agent, 4 parts of fatty alcohol sulfonate, 5 parts of reinforcing components, and 0.5 parts of sodium gluconate; among them, the recycled coarse aggregate is obtained by crushing and screening waste bricks, and the recycled fine aggregate is obtained by crushing waste concrete Screened; the early strength agent is a mixture of sodium sulfate and triethanolamine 1:1.6; the reinforcing component is basalt fiber, polypropylene mesh fiber, metakaolin, and CABR-MS605 rust inhibitor 1:1.5:1.5:0.6 mixture.

Embodiment 3

[0043] A construction waste regenerated concrete, prepared according to parts by weight, the preparation raw materials include 85 parts of fly ash, 34 parts of stone powder, 390 parts of recycled coarse aggregate, 370 parts of recycled fine aggregate, 40 parts of early strength agent, polycarboxylic acid reducing 1.3 parts of water agent, 5 parts of fatty alcohol sulfonate, 7 parts of reinforcing components, and 0.8 parts of sodium gluconate; among them, the recycled coarse aggregate is obtained by crushing and screening waste bricks, and the recycled fine aggregate is obtained by crushing waste concrete Screened; the early strength agent is a mixture of sodium sulfate and triethanolamine 1:1.8; the reinforcing component is basalt fiber, polypropylene mesh fiber, metakaolin, and CABR-MS605 rust inhibitor 1:1.9:1.7:0.9 mixture.

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Abstract

The invention relates to a construction waste recycled concrete, which belongs to the technical field of concrete. The raw materials for preparation include fly ash, stone powder, recycled coarse aggregate, recycled fine aggregate, early strength agent, water reducing agent, air-entraining agent, and reinforcing components. ; Among them, the recycled coarse aggregate is made by crushing and screening waste bricks, and the recycled fine aggregate is made by crushing and screening waste concrete; the reinforcing components include basalt fiber, polypropylene mesh fiber, metakaolin and CABR‑MS605 Rust inhibitor. The invention can improve the impermeability of recycled concrete.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to recycled concrete from construction waste. Background technique [0002] With the improvement of people's awareness of environmental protection, in recent years, more and more enterprises have begun to use construction waste as raw materials to prepare recycled concrete. [0003] There are a large number of waste clay bricks and waste concrete in the construction waste generated by the demolition of old buildings, so strengthening the recycling of waste clay bricks and waste concrete for the preparation of recycled concrete or the production of concrete products is the best way to realize the recycling of construction waste One of the effective ways, and more important practical significance. Usually waste bricks and waste concrete are mechanically crushed, graded and screened to obtain recycled aggregates to replace natural sand and gravel, reduce the amount of natural sand an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/18
CPCC04B28/18C04B18/08C04B18/12C04B18/16C04B22/147C04B24/122C04B2103/30C04B24/16C04B24/10C04B14/4643C04B16/0633C04B14/106C04B2103/61
Inventor 文俊强李彦昌杨荣俊庞永龙张硕
Owner BEIJING GAOQIANG CONCRETE
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