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Super-long-workability steel arch self-compacting concrete

A self-compacting concrete and workability technology, applied in the field of concrete, can solve problems such as the loss of concrete workability over time, and achieve the effect of sufficient concrete slurry

Inactive Publication Date: 2015-10-07
SHANGHAI URBAN CONSTR MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, high-fluidity, early-strength, and micro-expansion concrete are mostly used to avoid problems in the construction of concrete-filled steel pipes, and few special studies have been conducted on the loss of workability of concrete over time, which is a huge problem in the construction of steel arch concrete. Hidden danger

Method used

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  • Super-long-workability steel arch self-compacting concrete
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Experimental program
Comparison scheme
Effect test

Embodiment

[0020] Table 1 is the specific proportioning of the present embodiment:

[0021] Table 1

[0022] raw material

water

cement

mineral powder

fine aggregate

Coarse aggregate

expansion agent

Admixture

Specification

tap water

42.5PO

S95

Middle sand

5-10mm

HEA

Modified polycarboxylate

Unilateral dosage

175

400

170

816

800

57

6.27(1.1％)

[0023] After testing, the working performance of concrete:

[0024] Workability: Fresh concrete has good workability, no bleeding, no floating ash, and no bleeding after standing still;

[0025] Slump: The initial slump of fresh concrete is 260mm;

[0026] Setting time: the initial setting time is 8 hours, and the final setting time is about 12 hours.

[0027] After testing, concrete self-compacting performance:

[0028] Slump 260-280mm, expansion 760-850mm, T 500 ≤5s, the collapse velocity is ≤5s; the slump expansion is 550-655...

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Abstract

The invention discloses a super-long-workability steel arch self-compacting concrete. The super-long-workability steel arch self-compacting concrete comprises, by weight, 100 parts of a gel system composed of ordinary Portland cement and ore powder with a cement / ore powder weight ratio of 2.3:1-2.4:1, 142-145 parts of continuously-graded high-quality II district medium sand with the fineness modulus of 2.5-2.7, 138-140 parts of 5-10nm single-grading cobblestones with the crush index of 4-5%, 1.0-1.1 parts of a modified polycarboxylic acid additive, 9-10 parts of an expanding agent HEA, and 30-31 parts of water. In the invention, the new ash-free gelling system is established, the modified polycarboxylic acid additive is added, the water-gel ratio is strictly controlled, and the expanding agent with an appropriate amount and an appropriate type is added, so the prepared concrete has abundant slurry feed, workability, flowability and segregation resistance, can meet a super long workability requirement, and can well meet requirements of steel arch self-compacting concretes by engineering.

Description

technical field [0001] The invention relates to concrete technology, and specifically refers to a super-long working steel arch self-compacting concrete. Background technique [0002] The steel arch concrete structure has a history of several decades in foreign countries. In the 1930s, France and the Soviet Union applied this structure with superior performance to the arch system bridge. In the 1990s, with the development of research work on steel arch concrete structures in my country, steel arch concrete has been rapidly popularized and applied in arch system bridges. The steel arch concrete structure is a composite structure formed by filling concrete into steel pipes. Steel is characterized by high strength and elastic-plasticity, but it is prone to instability; concrete has good compressive properties, but poor flexural properties. The combination of steel pipe and concrete can make the concrete in a state of lateral compression, and the compressive strength is double...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B14/06
Inventor 徐亚玲徐海涛李欢欢董欢胡青莲景华杨路
Owner SHANGHAI URBAN CONSTR MATERIAL CO LTD
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