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A method of open carbonation strengthening recycled aggregate of waste concrete

A technology of waste concrete and recycled aggregate, which is applied in the direction of solid waste management, sustainable waste treatment, climate sustainability, etc., can solve the problems of difficult utilization of industrial waste gas and continuous production, etc., to improve the performance of recycled aggregate concrete, The effect of improving compactness and reducing water absorption

Active Publication Date: 2022-03-01
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to propose a method for open-type carbonization to strengthen recycled aggregates of waste concrete in order to overcome the technical problems that sealing carbonization cannot be continuously produced and industrial waste gas with low carbon dioxide concentration is difficult to use in the prior art. The present invention does not require carbon dioxide Sealed carbonization device, easy for continuous production, and can use different concentrations of carbon dioxide industrial waste gas

Method used

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  • A method of open carbonation strengthening recycled aggregate of waste concrete
  • A method of open carbonation strengthening recycled aggregate of waste concrete
  • A method of open carbonation strengthening recycled aggregate of waste concrete

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Effect test

Embodiment 1

[0045] A method for open-type carbonization and strengthening recycled aggregates of waste concrete, comprising the following steps:

[0046] (1) crushing and sieving the waste concrete blocks to obtain granular waste concrete regenerated aggregates with a particle size range of 10-20 mm, and seal them for preservation;

[0047] (2) With the recycled aggregate of waste and old concrete obtained in step (1), take the recycled aggregate according to the concentration of the recycled aggregate in water of 100g / L, and put it into a mesh cage;

[0048] (3) Immerse the grid cage in step (2) in the aqueous solution, control the water temperature to 20°C, and the stirring speed to 150r / min;

[0049] (4) Pass into the industrial waste gas of chemical industry in the aqueous solution in step (3), the carbon dioxide gas concentration is 95% in this industrial waste gas, and the ventilation rate of industrial waste gas is 0.1L / min / g;

[0050] (5) Soak the recycled aggregate in step (2) i...

Embodiment 2

[0055] A method for open-type carbonization and strengthening recycled aggregates of waste concrete, comprising the following steps:

[0056] (1) crushing and sieving the waste concrete blocks to obtain granular waste concrete regenerated aggregates with a particle size range of 5-10 mm, and seal them for preservation;

[0057] (2) With the recycled aggregate of waste and old concrete obtained in step (1), take the recycled aggregate according to the concentration of the recycled aggregate in water of 50g / L, and put it into a mesh cage;

[0058] (3) Immerse the grid cage in step (2) in the aqueous solution, control the water temperature to 20°C, and the stirring speed to 100r / min;

[0059] (4) Pass into the lime kiln industrial flue gas in the aqueous solution in the step (3), the carbon dioxide gas concentration is 37%, and the ventilation rate of the industrial flue gas is 0.3L / min / g;

[0060] (5) Soak the recycled aggregate in step (2) in the aqueous solution in step (4) f...

Embodiment 3

[0063] A method for open-type carbonization and strengthening recycled aggregates of waste concrete, comprising the following steps:

[0064] (1) crushing and sieving the waste concrete blocks to obtain granular waste concrete regenerated aggregates with a particle size range of 5-10 mm, and seal them for preservation;

[0065] (2) With the recycled aggregate of waste and old concrete obtained in step (1), it is 25g / L to take the recycled aggregate according to the concentration of the recycled aggregate in water, and put it into a grid cage;

[0066] (3) Immerse the mesh cage in step (2) in the aqueous solution, control the water temperature to 20°C, and the stirring speed to 50r / min;

[0067] (4) passing cement industrial flue gas into the aqueous solution in step (3), the concentration of carbon dioxide gas is 15%, and the ventilation rate of industrial flue gas is 0.5L / min / g;

[0068] (5) Soak the recycled aggregate in step (2) in the aqueous solution in step (4) for 5 ho...

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Abstract

The invention provides an open carbonization method for strengthening recycled aggregates of waste concrete. The waste concrete is crushed to obtain granular recycled aggregates. The granular recycled aggregates are soaked in water, and industrial waste gas containing carbon dioxide is continuously introduced. During the soaking process, the carbon dioxide contained in the industrial waste gas undergoes a carbonization reaction with the attached mortar on the surface of the granular recycled aggregate. The invention does not need a carbon dioxide sealed carbonization device, is easy to produce continuously, and can utilize industrial waste gas of carbon dioxide with different concentrations.

Description

technical field [0001] The invention belongs to the field of recycled aggregates of waste and old concrete, and in particular relates to an open carbonization method for strengthening recycled aggregates of waste and old concrete. Background technique [0002] Due to the demolition or collapse of buildings, a large amount of construction waste will be generated. According to statistics, China is the country that produces the most construction waste in the world, with an annual production of nearly 2 billion tons of construction waste, of which waste concrete accounts for about 30%-40%. Not only does it occupy arable land and pollute the environment, but also the alkaline waste concrete will deactivate large areas of soil. On the other hand, my country's infrastructure needs about 10 billion tons of sand and gravel aggregates every year. If such a large-scale demand is met only by mining, it will inevitably cause excessive consumption of limited natural resources and damage ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B20/02C04B18/16
CPCC04B20/026C04B18/16C04B20/023Y02W30/91
Inventor 刘松辉管学茂朱建平张海波勾密峰王雨利史才军
Owner HENAN POLYTECHNIC UNIV
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