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A method for treating recycled concrete aggregate strengthened by volcanic ash

A recycled concrete and treatment method technology, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve problems such as complex operation, achieve the effect of simple preparation process, simple operation, and improved physical and mechanical properties

Active Publication Date: 2018-05-15
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN104045251A discloses a method for strengthening recycled concrete aggregate with carbon dioxide, but this technical solution requires carbon dioxide curing equipment, and the operation in actual engineering is relatively complicated

Method used

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  • A method for treating recycled concrete aggregate strengthened by volcanic ash
  • A method for treating recycled concrete aggregate strengthened by volcanic ash
  • A method for treating recycled concrete aggregate strengthened by volcanic ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) C30 concrete beams are crushed and screened to obtain recycled concrete fine aggregate (G) with a particle size range of 0.16-2.5mm, and the recycled aggregate is placed in an oven at 60°C to dry to constant weight , to obtain recycled aggregate after drying;

[0025] (2) Use fly ash with a particle size of <45 μm (micron), add water to prepare a pozzolan slurry, the water-solid mass ratio is 10:1, and use ultrasonic dispersion for 8 minutes to form a homogeneous slurry solution;

[0026] (3) Place the recycled aggregate after drying in step (1) into the homogeneous slurry solution prepared in step (2) for soaking, and use a vibrator to vibrate and stir for 30 minutes;

[0027] (4) Put the mixed material treated in step (3) into a square hole sieve with a particle size of 75 μm (microns) to sieve and wash, sieve out the recycled aggregate, and filter off the excess slurry solution;

[0028] (5) Put the regenerated aggregate sieved in step (4) into a tray, put it in...

Embodiment 2

[0032] The difference between this embodiment and embodiment 1 is that in step (2), the pozzolanic material is silica fume with a particle size of <8 μm (micrometer).

Embodiment 3

[0034] The difference between this example and Example 1 is that in step (2), the pozzolanic material is nano-silicon with a particle size <0.8 μm (micrometer), and the water-solid mass ratio is 20:1.

[0035] The recycled concrete aggregate performance detection in the above-mentioned embodiment is as follows:

[0036] (1) Quality change of recycled aggregate before and after treatment

[0037] The weight gain of recycled aggregate before and after treatment, and the proportion of pozzolanic materials in the dried recycled aggregate were calculated, as shown in Table 1.

[0038]

[0039] (2) Performance changes of recycled aggregate before and after treatment

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Abstract

The invention relates to a treatment method of volcanic-ash-paste-reinforced recycled concrete aggregate. The method comprises the following steps: (1) carrying out crushing treatment and screening on recycled concrete, and drying to obtain recycled aggregate; (2) adding water into a volcanic ash material with the particle size of less than 60 micrometers to prepare a volcanic ash paste, and carrying out ultrasonic dispersion to form a homogeneous paste solution; (3) immersing the dried recycled aggregate in the step (1) in the homogeneous paste solution prepared in the step (2), and stirring; (4) screening the mixture treated in the step (3) to remove the recycled aggregate, and filtering to remove the excessive paste solution; (5) drying the screened recycled aggregate, and carrying out kneading dispersion on the agglomerate aggregate; and (6) screening the recycled aggregate treated in the step (5) to obtain the volcanic-ash-paste-reinforced recycled concrete aggregate. Compared with the mortar prepared from the untreated recycled concrete aggregate, the 3-day compression strength and 28-day compression strength of the mortar prepared from the volcanic-ash-paste-reinforced recycled concrete aggregate are enhanced by 17% or above, the chlorine ion permeability coefficient is lowered by 30% or above, and the new / old interface microhardness of the mortar is enhanced by 30% or above.

Description

technical field [0001] The invention relates to a method for strengthening treatment of recycled concrete aggregates, in particular to a method for strengthening treatment of recycled concrete aggregates with volcanic ash. Background technique [0002] Regenerated aggregate is the aggregate obtained after crushing waste concrete. Compared with natural aggregate, the surface of recycled aggregate has hardened cement slurry attached. The presence of hardened cement paste results in high water absorption and low strength of recycled aggregates. This results in a greater reduction in the performance of recycled concrete compared with ordinary concrete. 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B20/10C04B18/16
CPCC04B18/167C04B20/1055C04B20/0076Y02W30/91
Inventor 史才军曹芷杰谢昭彬王德辉
Owner HUNAN UNIV
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