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Waste concrete aggregate recycling and treating method

A waste concrete, recycling technology, applied in sustainable waste treatment, solid waste management, climate sustainability, etc. It can reduce the crushing value of the aggregate, reduce the water absorption rate of the aggregate, and reduce the porosity.

Inactive Publication Date: 2016-07-20
SUZHOU SICHUANGYUANBO ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the acid cleaning method has a limited effect and will also introduce acid radical ions, which will affect the pH value of the attached mortar; the polymer treatment method can effectively reduce the water absorption of the recycled concrete aggregate, but the improvement of the strength is limited; silicone water repellent Soaking with water glass not only costs high, but also changes the particle size and gradation of recycled aggregates, making the fineness modulus of fine aggregates exceed the standard range

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Pass the waste concrete discharged from the cleaning mixer truck of the concrete mixing plant through an iron sieve with a hole diameter of 10mm, and after the coarse aggregate is screened out, the waste concrete is concentrated in the sedimentation tank for sedimentation, and the clear water is discharged into the clear water tank.

[0019] Use a water-absorbing device or water-absorbing material to absorb the excess water in the waste concrete, and then add 0.5wt% of the waste concrete to the finely ground quicklime powder and mix evenly as needed, and use the principle of a large amount of water required for the hydration of the quicklime to further absorb the water in the concrete For excess water, the amount of quicklime is added so that there is no excess free water in the concrete aggregate, and recycled aggregate is obtained.

[0020] Prepare microbial culture medium, adjust the pH value to 7-9 by dropping NaOH solution, sterilize and cool to room temperature, in...

Embodiment 2

[0025] Pass the waste concrete discharged from the cleaning mixer truck of the concrete mixing plant through an iron sieve with a hole diameter of 10mm, and after the coarse aggregate is screened out, the waste concrete is concentrated in the sedimentation tank for sedimentation, and the clear water is discharged into the clear water tank.

[0026] Use a water-absorbing device or water-absorbing material to absorb the excess water in the waste concrete, and then add 0.5wt% of the waste concrete to the finely ground quicklime powder and mix evenly as needed, and use the principle of a large amount of water required for the hydration of the quicklime to further absorb the water in the concrete For excess water, the amount of quicklime is added so that there is no excess free water in the concrete aggregate, and recycled aggregate is obtained.

[0027] Prepare microbial culture medium, adjust the pH value to 7-9 by adding NaOH solution dropwise, sterilize and cool to room temperat...

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PUM

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Abstract

The invention discloses a waste concrete aggregate recycling and treating method. By means of the method, the purpose of recycling building waste can be effectively achieved, and the production cycle for preparing recycled concrete through the method is short; in the method, by means of treatment with a calcium hydroxide solution or a calcium salt solution to increase the content of substances, capable of being carbonized, in recycled aggregate, cracks are effectively filled with formed calcium carbonate after carbonization treatment, and the porosity of the recycled aggregate is effectively decreased, so that the crushing value and the water absorption of the aggregate are decreased.

Description

Technical field [0001] The present invention is the field of concrete material preparation technology, which involves a method of recycling of waste concrete aggregate recycling. Background technique [0002] According to relevant information statistics, my country is discharged by about 35%of waste concrete in structural engineering, and the rest are asphalt concrete and other wastes.According to rough statistics, only 40 million tons of garbage that demolished old buildings each year alone, of which about 13.6 million tons of disintegration old concrete occurred. In addition, my country currently pour about 200 million cubic meters of new concrete each year. Due to quality reasons, quality reasons are due to quality reasons. The discharge waste concrete is as many as 4.8 million tons. [0003] The preparation of waste concrete into recycled aggregate for regenerative concrete not only solves the problem of environmental pollution, but also realizes resource reuse, reducing wast...

Claims

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Application Information

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IPC IPC(8): C04B18/16C04B20/02
CPCC04B18/167C04B20/02Y02W30/91
Inventor 不公告发明人
Owner SUZHOU SICHUANGYUANBO ELECTRONICS TECH CO LTD
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