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Size and method for treating recycled coarse aggregates

A technology of recycled coarse aggregate and slurry, which is applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of large void ratio, low strength, high water absorption rate of recycled coarse aggregate, and achieve water absorption rate The effect of reducing, increasing the compressive strength, and reducing the crushing index

Inactive Publication Date: 2012-10-31
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the technical defects of low strength caused by high water absorption and large porosity of recycled coarse aggregate, the present invention provides a slurry and method for processing recycled coarse aggregate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Prepare a slurry of sulfoaluminate cement with a water-cement ratio of 0.8 mixed with 25% fly ash, add recycled coarse aggregate when the slurry is evenly stirred, soak it in the slurry, and continuously stir to eliminate air bubbles and prevent The cement sets. After soaking for 10 minutes, use a sieve with an aperture of 4.75 mm to remove the aggregate. In order to prevent the bonding between the coarse aggregates, a layer of fine sand was adhered to the coarse aggregates. After the slurry was naturally air-dried, the fine sands were screened out with a sieve with an aperture of 4.75 mm to obtain the modified regenerated coarse aggregate 1.

Embodiment 2

[0024] Prepare a slurry of sulfoaluminate cement with a water-cement ratio of 1.0 mixed with 30% fly ash, add recycled coarse aggregate when the slurry is evenly stirred, soak it in the slurry, and continuously stir to eliminate air bubbles and prevent The cement sets. After soaking for 8 minutes, use a sieve with an aperture of 4.75 mm to remove the aggregate. In order to prevent the bonding between the coarse aggregates, a layer of fine sand was adhered to the coarse aggregates. After the slurry was naturally air-dried, the fine sands were screened out with a sieve with an aperture of 4.75 mm to obtain the modified regenerated coarse aggregate 2.

Embodiment 3

[0026] Prepare a slurry of sulfoaluminate cement with a water-cement ratio of 1.22 mixed with 40% fly ash, add recycled coarse aggregate when the slurry is evenly stirred, soak it in the slurry, and continuously stir to eliminate air bubbles and prevent The cement sets. After soaking for 5 minutes, use a sieve with an aperture of 4.75 mm to remove the aggregate. In order to prevent the bonding between the coarse aggregates, a layer of fine sand was adhered to the coarse aggregates. After the slurry was naturally air-dried, the fine sands were screened out with a sieve with an aperture of 4.75 mm to obtain the modified recycled coarse aggregates 3 .

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Abstract

The invention relates to size and a method for treating recycled coarse aggregates, and belongs to the field of concrete recycled aggregates treating agents and concrete recycled aggregates treating. In order to solve the technical defects that the strength of the recycled coarse aggregates is low due to high water absorption and large porosity, the invention provides the size and the method for treating the recycled coarse aggregates. The size for treating the recycled coarse aggregates comprises sulphoaluminate cement, admixtures and water. The sulphoaluminate cement of the size permeates into the recycled coarse aggregates, so that the microcracks generated in recycled coarse aggregates crushing are filled to a certain degree; meanwhile, through the use of the dilution and nucleation effects of the admixtures and Ca(OH)2 enriched in old mortar of the recycled coarse aggregates consumed in secondary hydration reaction, the mortar structures of the recycled coarse aggregates are improved, so that the strength of the waste concrete recycled coarse aggregates is improved. After the size and the method are adopted, the crush indexes of the recycled coarse aggregates are remarkably reduced and meet the requirement regulated Pebble and crushed stone for construction GB / T14685-2011.

Description

technical field [0001] The invention relates to a slurry and a method for treating recycled coarse aggregate, and belongs to the field of concrete recycled aggregate treatment agent and treatment. Background technique [0002] Cement concrete structures typically only have a lifespan of a few decades, and after these structures have served their purpose, the old concrete is thrown away like trash. my country's concrete waste will reach 239 million tons in 2010, and will reach 638 million tons in 2020, with an average annual growth rate of 8%. The stacking or backfilling of these construction wastes not only encroach on fertile land, affect environmental quality, but also cause a waste of resources , does not conform to the strategy of sustainable development. Therefore, the recycling and reuse of waste concrete becomes inevitable. [0003] The method of using waste concrete to prepare recycled aggregate is: after crushing, cleaning and grading waste concrete blocks, they ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/06C04B18/16
CPCY02W30/91
Inventor 芦令超赵智慧王守德宫晨琛程新
Owner UNIV OF JINAN
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