Concrete for large tubular pile of autoclaving-free process

A concrete and steam-free curing technology, which is applied in sheet pile walls, foundation structure engineering, construction, etc., can solve the problems that cannot meet the production needs such as early demoulding, etc., to improve low-temperature hydration ability, improve strength and durability, Excellent overall effect

Inactive Publication Date: 2017-04-26
CCCC THIRD HARBOR ENG +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If steam curing is not used, the existing concrete preparation methods for large pipe piles cannot meet the production needs such as early demoulding

Method used

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  • Concrete for large tubular pile of autoclaving-free process
  • Concrete for large tubular pile of autoclaving-free process
  • Concrete for large tubular pile of autoclaving-free process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0035] One, the raw material of embodiment

[0036] (1) Cement: Type II early-strength Portland cement with a strength grade of 52.5.

[0037] (2) Slag powder: S105 grade granulated blast furnace slag powder.

[0038] (3) Fly ash microbeads: the water demand ratio is 80%, and the 7-day activity index is 85%.

[0039] (4) Silica fume: the specific surface area is 18500m 2 / kg, the activity index for 28 days was 96%.

[0040] (5) Fine aggregate (sand): medium sand with a fineness modulus of 2.6, a mud content of 0.5 wt%, and a mud content of 0.2 wt%.

[0041] (6) Coarse aggregate (stone): 5-20mm continuous graded crushed stone (prepared from 5-16mm and 10-20mm two grades, the weight ratio of 5-16mm and 16-20mm is 2.5:7.5) , the mud content is 0.4wt%, and the mud content is 0.1wt%.

[0042] (8) Early strength agent 1: calcium formate.

[0043] (9) Early strength agent two: lithium sulfate.

[0044] (10) Stimulator: anhydrite.

[0045] (11) Water reducer: GTS-413 early-str...

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Abstract

The invention belongs to the technical field of concrete materials, and in particular relates to concrete for a large tubular pile of an autoclaving-free process. Each cubic meter of preparation materials of the concrete comprise the following components: 360-450kg of cement, 30-80kg of slag powder, 10-70kg of coal ash microbeads, 10-50kg of silicon ash, 540-625kg of fine aggregate, 1200-1270kg of coarse aggregate, 1-4kg of calcium formate, 1-4kg of lithium sulfate, 6-12kg of anhydrite, 2-5kg of a water reducing agent and 115-130kg of water. A series of tests and studies on the proportioning ratio of the concrete provided by the invention are implemented, and an optimal concrete proportioning ratio which can meet the requirement of large tubular pile demolding strength and strength of C60 concrete within a relatively short time at a normal temperature can be obtained.

Description

technical field [0001] The invention belongs to the technical field of concrete materials, and in particular relates to a concrete for large-pipe piles with a non-steam curing process. Background technique [0002] At present, domestic high-piled wharves are the most widely used type of wharf structure, and post-tensioned prestressed large-diameter pipe piles (large pipe piles) occupy an important position in the pile foundation of port wharfs due to their excellent performance and high cost-effective advantages. Compared with steel pipe piles, the cost of large pipe piles is only 1 / 3 to 1 / 2 of steel pipe piles, which has obvious economic advantages. However, with the continuous development of pile-making technologies such as PHC pipe piles, the application of PHC pipe piles and other pile types in projects such as ports and wharfs is increasing. At the same time, due to the overcapacity of steel products, the cost of steel products is also showing a downward trend, so the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04E02D5/30
CPCC04B28/04C04B2201/20C04B2201/50E02D5/30
Inventor 王成启刘思楠高海浪谷坤鹏
Owner CCCC THIRD HARBOR ENG
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