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Method for recovering and reinforcing concrete aggregate

A concrete aggregate and concrete technology, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, 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: 2016-08-24
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

[0016] 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.

[0017] 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.

[0018] Calcium hydroxide solution or calcium salt plus calcium treatment: Take recycled fine aggregate prepared from construction waste a...

Embodiment 2

[0022] 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.

[0023] 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.

[0024] Calcium hydroxide solution or calcium salt plus calcium treatment: Take recycled fine aggregate prepared from construction waste a...

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Abstract

The invention discloses a method for recovering and reinforcing concrete aggregate. According to the method, waste concrete discharged during cleaning of a stirring vehicle is scientifically and effectively utilized, and water for separating cement and sand is saved. When the content of carbonatable substances in recycled aggregate is increased during treatment of a calcium hydroxide solution or a calcium salt solution with the method, calcium carbonate formed after carbonization treatment effectively fills microcracks, the porosity of the recycled aggregate is effectively reduced, and the crushing value and the water absorption of the aggregate are further reduced.

Description

technical field [0001] The invention belongs to the technical field of concrete material preparation, and in particular relates to a method for recycling and strengthening concrete aggregate. Background technique [0002] With the vigorous development of my country's construction industry, concrete is widely used in various buildings. Concrete mixer trucks, concrete mixing stations and concrete mixing buildings and other equipment need to be cleaned and maintained frequently during production, and a large amount of waste generated is dumped as sludge, causing great waste. [0003] According to relevant statistics, about 35% of waste concrete is discharged in structural engineering in my country, and the rest is waste such as asphalt concrete. According to rough statistics, in my country alone, the waste from demolition of old buildings reaches more than 40 million tons every year, of which the amount of disintegrated old concrete is about 13.6 million tons. The discharge of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/16C04B20/02
CPCC04B18/167C04B20/023Y02W30/91
Inventor 不公告发明人
Owner SUZHOU SICHUANGYUANBO ELECTRONICS TECH CO LTD
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