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Concrete mixing proportion for deposition tube tunneltron segment

An immersed tube tunnel and concrete technology, which is applied in solid waste management, artificial islands, underwater structures, etc., to achieve the effects of saving cement, reducing construction energy consumption, and improving strength

Active Publication Date: 2009-10-07
CHINA RAILWAY TUNNEL GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the currently used proportioning scheme, the proportion of concrete for the main body of the pipe section and the concrete for the post-casting belt of the pipe section are the same, and there are certain hidden dangers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 1. The main concrete mass ratio of the pipe section: water 7.3%, cement 10.5%, fly ash 2.1%, mineral powder 4.9%, sand 29.9%, gravel 44.9%, superplasticizer 0.4%.

[0050] The main concrete of the pipe section configured with this mix ratio: the measured 3d strength is about 23.7MPa, reaching 68% of the technical requirement strength; the 7d strength is about 34.8MPa, reaching 99% of the technical requirement strength; the 28d strength is about 53.8MPa, reaching 50% of the technical requirement strength 154%. The slump is about 120mm, and the bulk density is about 2391kg / m 3

[0051] 2. The mass ratio of post-pouring concrete in the pipe section: 7.50% water, 13.32% cement, 3.38% mineral powder, 30.23% sand, 43.52% gravel, 0.44% superplasticizer, 0.03% fiber, and 1.58% expansion agent

[0052] The post-cast concrete with this mix ratio configuration: the measured 3d strength is about 31.8MPa, reaching 80% of the technical requirement strength; the 7d strength is about...

example 2

[0055] 1. The mass percentage of the main body of the pipe section: water 7.3%, cement 10.5%, fly ash 2.6%, mineral powder 4.4%, sand 29.9%, gravel 44.9%, superplasticizer 0.4%.

[0056] The main concrete of the pipe section configured with this mix ratio: the measured 3d strength is about 21.8MPa, reaching 62% of the technical requirement strength; the 7d strength is about 35.9MPa, reaching 103% of the technical requirement strength; the 28d strength is about 53.5MPa, reaching the technical requirement strength of 50% 153%. The slump is about 130mm, and the bulk density is about 2389kg / m 3

[0057] 2. The mass percentage of post-cast concrete in the pipe section: 7.50% water, 13.41% cement, 3.41% mineral powder, 30.23% sand, 43.52% gravel, 0.44% superplasticizer, 0.03% fiber, and 1.46% expansion agent

[0058]The post-pouring concrete of the pipe section configured with this mix ratio: the measured 3d strength is about 32.5MPa, reaching 81% of the technical requirement stre...

example 3

[0061] 1. The mass percentage of the main body of the pipe section: water 7.3%, cement 10.5%, fly ash 3.2%, mineral powder 3.8%, sand 29.9%, gravel 44.9%, superplasticizer 0.4%.

[0062] The main concrete of the pipe section configured with this mix ratio: the actual measured 3d strength is about 23.5MPa, reaching 67% of the technical requirement strength; the 7d strength is about 34.5MPa, reaching 99% of the technical requirement strength; the 28d strength is about 52.1MPa, reaching 50% of the technical requirement strength 149%. The slump is about 135mm, and the bulk density is about 2395kg / m 3

[0063] 2. The mass percentage of post-cast concrete in the pipe section: 7.50% water, 13.22% cement, 3.36% mineral powder, 30.23% sand, 43.52% gravel, 0.44% superplasticizer, 0.03% fiber, and 1.70% expansion agent

[0064] The post-cast concrete of the pipe section configured with this mix ratio: the measured 3d strength is about 30.4MPa, reaching 76% of the technical requirement ...

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Abstract

The present invention relates to a cement concrete configuration technic, specifically, a concrete mixing proportion for deposition tube tunneltron segment which includes a pipeline section body concrete mixing proportion and pipeline section late poured band concrete mixing proportion. The pipeline section body concrete has weight percentage as follows: water 7.3%, cement 10.5%, fly ash 2.1-3.5%, mineral powder 3.5-4.9%, sand 29.9%, stone 43.52%, high efficiency water reducing agent 0.44%, fabric 0.03% and plumping agent 1.46-1.83%. The pipeline section mass concrete manufactured by the mixing proportion can satisfy design volume weight, strength gradation of the pipeline section concrete which has better anti-seepage and anti-crack property, and has favour economical efficiency.

Description

technical field [0001] The invention relates to cement concrete configuration technology, in particular to a concrete mixing ratio for pipe sections of immersed tunnels. Background technique [0002] Immersed tube tunnels in China started relatively late. The only immersed tube tunnels open to traffic in mainland China are Ningbo Yongjiang Tunnel, Guangzhou Pearl River Tunnel, Ningbo Changhong Tunnel, Hangzhou Bay Submarine Immersed Tunnel and Shanghai Outer Ring Crossing River Tunnel. Immersed tube tunnel, as a tunnel construction method for crossing rivers and seas, is attracting more and more attention. The immersed tube section is the main structure of the immersed tube tunnel, and its quality is related to the success or failure of the entire tunnel. The pipe section of the immersed tube tunnel has a large volume. As the main structure of the tunnel, it will eventually bear various loads, which requires concrete for the pipe section to meet the design strength; the pip...

Claims

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Application Information

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IPC IPC(8): C04B28/00E02D29/063C04B18/08C04B18/12C04B14/06C04B14/02
CPCC04B28/02Y02W30/91C04B14/02C04B14/06C04B18/08C04B18/12C04B2103/302C04B20/0048C04B2103/58
Inventor 程晓明王光辉洪开荣李治国马宏建周仲贺宋妍王立军
Owner CHINA RAILWAY TUNNEL GROUP CO LTD
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