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Reinforcing method of recycled coarse aggregate, obtained reinforced recycled coarse aggregate and concrete

A technology for recycling coarse aggregate and recycled concrete, applied in the field of building materials, can solve the problems of unstable performance, complicated operation and high cost, and achieve the effect of reducing porosity, simple operation and less process.

Pending Publication Date: 2022-07-08
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a strengthening method of recycled coarse aggregate and the obtained reinforced recycled coarse aggregate and concrete, which are used to solve the problem of complicated operation, high cost and unstable performance of existing recycled coarse aggregate reinforcement and its recycled concrete preparation method technical issues

Method used

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  • Reinforcing method of recycled coarse aggregate, obtained reinforced recycled coarse aggregate and concrete

Examples

Experimental program
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Embodiment 1

[0060] A method for strengthening recycled coarse aggregate and a method for preparing recycled concrete, comprising the following steps:

[0061] 1) grading, crushing and sieving the regenerated coarse aggregate to obtain 50 kg of regenerated coarse aggregate with a particle diameter of (5-40) mm;

[0062] 2) Rinse the regenerated coarse aggregate with running water for 5 minutes, and dry it naturally to obtain dry regenerated coarse aggregate;

[0063] 3) placing the dry regenerated coarse aggregate in a concrete mixer at 48r / min for mechanical grinding for 3h, taking out and sieving to obtain a physically strengthened regenerated coarse aggregate with a particle size of (5-36) mm;

[0064] 4) 2.5kg of 2000-purpose silica fume and 8kg of water are evenly stirred to obtain a silica fume slurry;

[0065] 5) Place 40kg of physically strengthened recycled coarse aggregate and silica fume slurry in a concrete mixer, and stir at 48r / min for 120s;

[0066] 6) Place 40kg of stones...

Embodiment 2

[0071] The regenerated coarse aggregate in this example is not chemically strengthened by silica fume slurry coating, and steps 4) and 5) in the above-mentioned example 1 are omitted. Coarse aggregate, 40kg of stones with a particle size of (5-25) mm and 65kg of sand with a particle size of (0.25-0.5) mm were placed in a concrete mixer at 48r / min for 60s, and 2.5kg of 2000 mesh silica fume and 8kg of water were mixed together. Add to the 30kg 42.5 grade ordinary Portland cement described in step 7) in the above embodiment 1, stir at 48r / min for 30s, and the rest are the same as in embodiment 1.

Embodiment 3

[0073] The regenerated coarse aggregate in this example does not undergo physical strengthening by mechanical grinding and chemical strengthening by coating with silica fume slurry, and steps 3), 4) and 5) in the above-mentioned Example 1 are omitted. In the above-mentioned Example 1 Step 1) is to classify, crush and sieve the regenerated coarse aggregate to obtain 40kg of regenerated coarse aggregate with a particle size of (5-36) mm. For the gravel of (5-25) mm and the sand of (0.25-0.5) mm with a particle diameter of 65kg, place in the concrete mixer and stir 60s at 48r / min, add 2.5kg of 2000 purpose silica fume and 8kg of water to the steps in the above-mentioned embodiment 1 7) In the described 30kg 42.5 grade ordinary Portland cement, stir together at 48r / min for 30s, and the rest are the same as in Example 1.

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Abstract

The invention discloses a reinforcing method of recycled coarse aggregate, the obtained reinforced recycled coarse aggregate and concrete, and belongs to the technical field of building materials.The reinforcing method of the recycled coarse aggregate comprises the steps that firstly, the recycled coarse aggregate is placed in a concrete mixer to be mechanically ground and then taken out to be screened, and the physically-reinforced recycled aggregate is obtained; then preparing silica fume slurry, putting the recycled coarse aggregate into the silica fume slurry, and stirring and wrapping the slurry, so as to obtain reinforced recycled coarse aggregate; the preparation method of the recycled concrete comprises the following steps: adding the reinforced recycled coarse aggregate, the stones, the sand, the cement, the water and the polycarboxylate superplasticizer into a concrete mixer according to a mixing process, and stirring to obtain the recycled concrete. The strength of the recycled coarse aggregate can be improved, the performance of the prepared recycled concrete is effectively improved, the treatment strengthening method is simple, aggregate strengthening and concrete mixing connection are compact, and the application range of the recycled aggregate can be expanded.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a strengthening method of recycled coarse aggregate, and the obtained reinforced recycled coarse aggregate and concrete. Background technique [0002] With the continuous acceleration of industrialization and urbanization in the world, the demand for building materials and the generation of construction waste have increased significantly, and the consumption of resources and the damage to the ecological environment have become increasingly serious. Concrete is one of the most widely used building materials at present. The production of the coarse aggregate in its components, that is, stone, requires mining and consumption of a large amount of natural stone, which has caused serious damage to the ecological environment and natural landscape. More and more old buildings that cannot meet the needs of today's construction are in urgent need of renovation or demolition, resul...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B20/02C04B20/10C04B18/16B02C21/00
CPCC04B28/04C04B20/1055C04B20/026C04B18/16B02C21/00C04B2111/00017C04B2201/50C04B18/146C04B14/02C04B14/06C04B2103/302Y02W30/91
Inventor 谢群林明强刘恩铭
Owner UNIV OF JINAN
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