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Concrete for coating pipeline

A concrete and coating technology, applied in the field of concrete, can solve the problems of high water ash, unsatisfactory, unsuitable for pipeline coating weight, etc., achieves broad application prospects, maintains stability, and reduces material costs.

Inactive Publication Date: 2007-11-07
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Ordinary concrete commonly used in construction at present has a wide range of uses, but the following disadvantages determine that it is not suitable for use as a pipeline coating counterweight:
[0004] (1) Ordinary concrete usually uses sand and stone aggregates, and its density generally does not exceed 2400Kg / m 3 , cannot meet the density of pipeline concrete counterweight layer 2400~2850Kg / m 3 requirements;
[0005] (2) In order to obtain better building construction performance and compactness, ordinary concrete generally has a relatively high water-cement ratio and cannot be used for pipeline counterweight coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. The concrete components for pipeline coating are as follows:

[0023] Heavy aggregate:sand:ordinary Portland cement:water is mixed in a weight ratio of 31:43.88:20:5.12.

[0024] mesh size

9.50mm

4.75mm

2.36mm

1.18mm

600μm

300μm

150μm

Passing rate(%)

100

87.98

57.42

45.61

29.96

18.24

13.65

[0025] mesh size

4.75mm

2.36mm

1.18mm

600μm

300μm

150μm

Sieve residue (%)

2.97

9.11

15.26

40.87

88.28

99.70

[0026] The cement is ordinary Portland cement P·O 42.5, the tricalcium aluminate content is 6.3%, and the alkali content is 0.46%;

[0027] 2. After the components are combined, concrete is formed by mechanical stirring. The measured water-cement ratio is 0.26, and the concrete density of the counterweight coating specimen is 2428Kg / m 3 ;

Embodiment 2

[0029] 1. The concrete components for pipeline coating are as follows:

[0030] Heavy aggregate: sand: ordinary Portland cement: water is mixed in a weight ratio of 36:33:25:6.

[0031] mesh size

9.50mm

4.75mm

2.36mm

1.18mm

600μm

300μm

150μm

Passing rate(%)

100

87.98

57.42

45.61

29.96

18.24

13.65

[0032] mesh size

4.75mm

2.36mm

1.18mm

600μm

300μm

150μm

Sieve residue (%)

2.97

9.11

15.26

40.87

88.28

99.70

[0033] The cement is ordinary Portland cement P·O 42.5, the tricalcium aluminate content is 6.3%, and the alkali content is 0.46%;

[0034] 2. After the components are combined, concrete is formed by mechanical stirring. The measured water-cement ratio is 0.24, and the concrete density of the counterweight coating specimen is 2565Kg / m 3 ;

Embodiment 3

[0036] 1. The concrete components for pipeline coating are as follows:

[0037] Heavy aggregate: sand: ordinary Portland cement: water is mixed in a weight percentage of 46.66:25.18:22:6.16.

[0038] mesh size

9.50mm

4.75mm

2.36mm

1.18mm

600μm

300μm

150μm

Passing rate(%)

100

91.14

57.60

45.13

30.48

19.82

14.98

[0039] mesh size

4.75mm

2.36mm

1.18mm

600μm

300μm

150μm

Sieve residue (%)

3.21

9.56

16.80

41.82

88.17

97.41

[0040] The cement is Portland cement P·II42.5R, the tricalcium aluminate content is 6.8%, and the alkali content is 0.53%;

[0041] 2. After the components are combined, concrete is formed by mechanical stirring. The measured water-cement ratio is 0.28, and the concrete density of the counterweight coating specimen is 2750Kg / m 3 ;

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Abstract

The present invention relates to concrete for pipeline balance, and is especially one kind of dry concrete with density of 2,400-2,850 Kg / cu m for coating pipeline. The concrete for coating pipeline has the materials comprising heavy aggregate 30-55 wt%, sand 15-45 wt%, cement 16-25 wt% and water 3.5-8 wt%. It is coated to the outer surface of pipeline through spraying and extruding to form concrete coating maintaining the stability of pipeline in water. The present invention has wide application range.

Description

technical field [0001] The invention relates to concrete used in the technical field of pipeline coating counterweight, in particular to a concrete with a density of 2400-2850Kg / m 3 dry hard concrete. Background technique [0002] For oil and gas transmission pipelines laid in seabeds, rivers, lakes, beach seas and swamps at a certain depth, in order to eliminate the buoyancy of water on the pipeline and maintain the stability of the pipeline after laying, it is generally necessary to spray or squeeze the outer wall of the pipeline. Coating a certain thickness of concrete counterweight layer, the design usually requires the density of the counterweight layer concrete to be greater than 2400Kg / m 3 , the coating process requires the concrete to have dry and hard working performance; [0003] Ordinary concrete commonly used in construction at present has a wide range of uses, but the following disadvantages determine that it is not suitable for u...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B14/06C04B14/36C04B24/20C04B24/22C04B103/30
Inventor 吴文通张晓灵顾艳胡峰
Owner CHINA NAT OFFSHORE OIL CORP
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