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Method for preparing recycled concrete by using unqualified ready-mixed concrete and recycled powder

A technology of ready-mixed concrete and recycled concrete, which is applied in the field of building materials, can solve the problems of inability to realize the disposal and utilization of waste commercial concrete, affect the working performance of recycled concrete, and affect the vibration and compactness of recycled concrete, so as to be beneficial to industrial production and application, Slow down excessive consumption, economic and social benefits are remarkable

Active Publication Date: 2021-10-08
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when using unqualified ready-mixed concrete to replace ordinary concrete, there will be the following problems: 1) the unqualified ready-mixed concrete has a large consistency, which will affect the working performance of recycled concrete, make its slump smaller, and cause pumping difficulties; , the high viscosity of unqualified ready-mixed concrete also makes it difficult to mix evenly during the mixing process, causing the recycled concrete to appear delaminated; in addition, the viscous ready-mixed concrete also affects the recycled concrete in densely reinforced components. The vibration is dense, forming some voids to reduce the performance of the component
The wall bricks provided by the invention patent utilize the slurry produced by ready-mixed concrete enterprises and the waste liquid produced in the papermaking process, which is low in cost, green and environmentally friendly, and has high economic benefits. The prepared wall bricks have high compressive strength and frost resistance. Good, but this patent only provides a treatment method for waste slurry in waste concrete, and cannot realize the treatment and utilization of all components of waste commercial concrete

Method used

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  • Method for preparing recycled concrete by using unqualified ready-mixed concrete and recycled powder
  • Method for preparing recycled concrete by using unqualified ready-mixed concrete and recycled powder
  • Method for preparing recycled concrete by using unqualified ready-mixed concrete and recycled powder

Examples

Experimental program
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Effect test

Embodiment 1

[0042] The specific process of preparation is as follows: (1) the unqualified ready-mixed concrete is preserved for 3 hours; (2) 0.06% sodium citrate retarder is mixed into the unqualified ready-mixed concrete and stirred at a speed of 10-15 rpm (3) Mix new concrete according to the base mix ratio, and use mechanical stirring for 5 to 10 minutes; (4) Keep the new concrete in a stirring state, slowly pour 30% of unqualified ready-mixed concrete into the new concrete according to the mass ratio and Add 40% of recycled powder and 0.16% of polycarboxylate superplasticizer to the total mass of the mixture, and stir for 5 to 10 minutes.

Embodiment 2

[0044] The specific process of preparation is as follows: (1) the unqualified ready-mixed concrete is preserved for 3 hours; (2) 0.06% sodium citrate retarder is mixed into the unqualified ready-mixed concrete and stirred at a speed of 10-15 rpm (3) Mix new concrete according to the base mix ratio, and use mechanical stirring for 5 to 10 minutes; (4) Keep the new concrete in a stirring state, slowly pour 30% of unqualified ready-mixed concrete into the new concrete according to the mass ratio and Add 10% of recycled powder and 0.16% of polycarboxylate superplasticizer, which account for the total mass of the mixture, and stir for 5 to 10 minutes.

Embodiment 3

[0046] The specific process of preparation is as follows: (1) the unqualified ready-mixed concrete is preserved for 4.5 hours; (2) 0.13% sodium citrate retarder is mixed into the unqualified ready-mixed concrete and stirred at a speed of 10-15 rpm (3) Mix new concrete according to the base mix ratio, and use mechanical stirring for 5 to 10 minutes; (1) Keep the new concrete in a stirring state, slowly pour 30% of unqualified ready-mixed concrete into the new concrete according to the mass ratio and Add recycled powder accounting for 40% of the total mass of the mixture and 0.31% polycarboxylate superplasticizer, and stir for 5 to 10 minutes.

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Abstract

The invention relates to a method for preparing recycled concrete by using unqualified ready-mixed concrete and recycled powder. Preserve; prepare new concrete according to the standard, mix unqualified ready-mixed concrete into new concrete at a mass ratio of 10-50%; then add water reducing agent accounting for 0.16-0.31% of the total mass of the mixture and 10-40w% The recycled powder is mechanically stirred evenly to obtain recycled concrete. The concrete prepared by the invention can better solve the problem of unqualified ready-mixed concrete in concrete production, does not pollute the environment, reduces the amount of materials used in concrete production, and the prepared recycled concrete can meet the performance requirements of the concrete before being replaced. Therefore, the present invention has remarkable economic benefit, environmental benefit and social benefit.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for preparing recycled concrete by using unqualified ready-mixed concrete and recycled powder. Background technique [0002] Commercial concrete mixing plants will inevitably produce a lot of unqualified ready-mixed concrete. For example, due to problems in the transportation process and on-site construction organization problems, the pouring cannot be done on schedule, some ready-mixed concrete produced during production, and concrete with too small slump. A large amount of unqualified ready-mixed concrete was discharged when the cement mixer truck returned to the station after unloading at the construction site was washed. If the unqualified ready-mixed concrete is landfilled or stacked after final setting, it will occupy a large amount of land, and the sand and gravel will be separated. The various waste slurry generated in the production proce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/02
CPCC04B28/02C04B2201/50C04B14/06C04B14/02C04B2103/302C04B24/06C04B18/167C04B18/16C04B40/0028
Inventor 肖建庄隋同波李坛易卓然
Owner TONGJI UNIV
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