100% substituted rate recycled aggregate concrete with low slump loss

A technology of slump loss and recycled aggregate, applied in sustainable waste treatment, solid waste management, climate sustainability, etc. The effect of promoting flow properties and enhancing interfacial strength

Inactive Publication Date: 2018-12-18
SHANGHAI CONSTRUCTION GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, judging from the current utilization of recycled aggregates, it is not ideal
Recycled concrete made with recycled aggregates usually has low strength, poor fluidity, and large slump loss over time.
The main reason is that recycled aggregates usually have poor grain shape, old mortar and a large amount of impurities attached to the surface
The old mortar on the surface will cause the water absorption rate of the recycled aggregate to far exceed that of the natural aggregate, which will affect the fluidity of the concrete, and the poor particle shape will also cause the cement slurry to not completely wrap the recycled aggregate, resulting in a decrease in the fluidity of the concrete
In addition, the continuous water absorption of recycled aggregates also causes the slump loss of recycled concrete to far exceed that of natural aggregate concrete
These unfavorable factors above lead to a low substitution rate (usually ≤ 30%) when the mixing station uses recycled aggregates, and the preparation strength is generally not high (C20~C30)

Method used

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  • 100% substituted rate recycled aggregate concrete with low slump loss
  • 100% substituted rate recycled aggregate concrete with low slump loss
  • 100% substituted rate recycled aggregate concrete with low slump loss

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The concrete mix ratio using ordinary recycled aggregate is shown in Table 1-1:

[0025] Table 1-1 Concrete mix ratio using ordinary recycled aggregate (kg / m 3 )

[0026] water

P.O42.5 cement

fly ash

Granulated blast furnace slag powder

yellow sand

recycled coarse aggregate

Dosage of superplasticizer

210

190

70

90

850

1050

3.7

[0027] The working performance and mechanical properties of concrete using ordinary recycled aggregates are measured as shown in Table 1-2:

[0028] Table 1-2 Work performance and mechanical properties of ordinary recycled aggregate concrete

[0029]

Embodiment 2

[0031] The mix ratio of gel-treated recycled aggregate concrete is shown in Table 2-1:

[0032] Table 2-1 Mixing ratio of gel-treated recycled aggregate concrete (kg / m 3 )

[0033] water

P.O42.5 cement

fly ash

Granulated blast furnace slag powder

yellow sand

Gel-treated recycled coarse aggregate

Dosage of superplasticizer

210

190

70

90

850

1050

3.7

[0034] The difference from Example 1 is that the ordinary recycled coarse aggregate is replaced by gel-treated recycled coarse aggregate, and other steps and parameters are the same as in Example 1.

[0035] The measured working and mechanical properties of the gel-treated recycled aggregate concrete are shown in Table 2-2:

[0036] Table 2-2 Workability and mechanical properties of gel-treated recycled aggregate concrete

[0037]

[0038] Its slump diagram is shown in figure 1 , the schematic diagram of its compressive strength is shown in figure 2 .

[0039]...

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PUM

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Abstract

The invention provides 100% substituted rate recycled aggregate concrete with low slump loss, and belongs to the technical field of recycled concrete in constructional engineering. The recycled aggregate concrete includes cement, water, fly ash, granulated blast-furnace slag powder, yellow sand, gel-treated recycled coarse aggregate and a high-effective water reducer according to certain ratio, wherein a gel treatment solution is prepared from a calcium material, a silicon material and water according to certain ratio. Compared with conventional recycled aggregate concrete, the concrete is high in aggregate replacement rate (100%), so that effective utilization of the recycled aggregate is achieved. In addition, the concrete has good initial flowability, and is far lower than regular whole-substituted recycled aggregate concrete in slump time loss, thus satisfying engineering application demand.

Description

technical field [0001] The invention belongs to the technical field of recycled concrete in construction engineering, in particular to a recycled aggregate concrete with a low slump loss and 100% replacement rate. Background technique [0002] It is an important way to realize the effective utilization of waste concrete by screening, crushing and shaping the waste concrete to produce recycled aggregate for the production of recycled concrete. However, judging from the current utilization of recycled aggregate, it is not ideal. Recycled concrete made with recycled aggregates usually has low strength, poor fluidity, and large slump loss over time. The main reason is that recycled aggregates usually have poor grain shape, old mortar and a lot of impurities attached to the surface. The old mortar on the surface will cause the water absorption rate of the recycled aggregate to far exceed that of the natural aggregate, which will affect the fluidity of the concrete, and the poor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B18/16C04B20/10
CPCC04B18/16C04B20/10C04B28/04C04B2201/50C04B18/08C04B18/142C04B14/068C04B24/24C04B24/18C04B22/002Y02W30/91
Inventor 龚剑王圣怡许永和徐俊史晓婉
Owner SHANGHAI CONSTRUCTION GROUP
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