Method for carbon dioxide strengthening of recycled concrete aggregate

A technology of recycled concrete and carbon dioxide, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of reducing the water absorption rate of recycled concrete aggregates, affecting the pH value of the attached mortar, and limited strength improvement. Achieve the effect of increasing strength, increasing compactness, reducing water absorption and crushing value

Active Publication Date: 2014-09-17
HUNAN UNIV
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  • Abstract
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Problems solved by technology

Among them, the mechanical strengthening method will cause damage to the aggregate; the acid cleaning method has 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 recycled concrete aggregate, but it is not effective for Limited increase in strength

Method used

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  • Method for carbon dioxide strengthening of recycled concrete aggregate
  • Method for carbon dioxide strengthening of recycled concrete aggregate
  • Method for carbon dioxide strengthening of recycled concrete aggregate

Examples

Experimental program
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Embodiment 1

[0021] This embodiment includes the following steps:

[0022] (1) Recycled concrete aggregate: C30 concrete beams are crushed and screened to obtain recycled concrete fine aggregate (G) with a particle size range of 0.16-2.5mm, which is sealed and stored;

[0023] (2) CO 2 Strengthening treatment: put the recycled concrete fine aggregate (G) in a closed container, and control the relative humidity of the container to 60%, CO 2 The volume concentration is 20%, carbonized for 6 days; the incompletely carbonized recycled concrete aggregate is 4%, and the obtained CO 2 The strengthened recycled concrete aggregate (G-CI) is sealed and preserved;

[0024] (3) Preparation of recycled mortar: The treated recycled concrete aggregate particles are made into recycled mortar.

[0025] via CO 2 The differential thermal curves of recycled concrete aggregate before and after strengthening treatment are as follows: figure 1 shown. from figure 1 Visible: Via CO 2 After strengthening tr...

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Abstract

A method for carbon dioxide strengthening of a recycled concrete aggregate comprises the following steps: (1) crushing and sieving waste concrete; (2) placing the sieved recycled concrete aggregate in a sealed container, controlling the relative humidity of 30-90% and the CO2 concentration of 5-90%, and carrying out carbonization treatment; and (3) making the treated recycled concrete aggregate particles into recycled mortar and concrete. Compared with mortar prepared from a recycled concrete aggregate without treatment, the mortar prepared from the obtained recycled concrete aggregate after CO2 strengthening treatment enables the mortar early strength to be improved by 20.1%-22.0% and the later strength to be improved by 12.1%-13.9%; the 28 d drying shrinkage value can be reduced by 7.8%-16.7%; and the 28 d water absorption rate can be reduced by 7.7%-13.3%.

Description

technical field [0001] The invention relates to a strengthening treatment method of recycled concrete aggregate, in particular to a method using CO 2 Intensified method for processing recycled concrete aggregate. Background technique [0002] Regenerated aggregate is the aggregate obtained after crushing waste concrete. Compared with natural aggregate, the surface of recycled aggregate is attached with hardened cement slurry. The existence of hardened cement slurry leads to high water absorption and low strength of recycled aggregate, which makes Compared with ordinary concrete, the performance of recycled concrete is greatly reduced. By strengthening the recycled aggregate, the physical and mechanical properties of the recycled aggregate can be improved, thereby improving the performance of the recycled concrete. The improvement of the performance of recycled concrete is of great significance to the recycling and sustainable development of concrete. [0003] At present, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/16
CPCY02W30/91
Inventor 史才军李亚可种霖霖马丹阳
Owner HUNAN UNIV
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