Vibration-free self-flowing dense concrete

A technology of compacting concrete and apparent density, applied in the field of building materials, can solve the problems of complex shape, non-compact structure quality, difficulty in vibrating, etc., and achieve the effect of small loss value over time, excellent durability, and good workability.

Inactive Publication Date: 2008-05-28
CHINA RAILWAY BRIDGE SCI RES INST LTD +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Some bridges are difficult to vibrate due to factors such as dense reinforcement, complex shape,

Method used

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  • Vibration-free self-flowing dense concrete

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Embodiment Construction

[0013] The present invention will be further described below in conjunction with embodiment. This embodiment is a model that combines the lower flange of the concrete T-beam structure, the junction position between the web of the concrete box girder and the bottom plate, and other parts that are difficult to pour concrete, and corresponding test pieces. The left half of the model simulates the T-beam structure, while the right half simulates the structure at the junction of the box girder web and the bottom plate; in the lateral distribution, the main reinforcement is divided into three types of spacing, and the three kinds of reinforcement spacing are 4.5cm, 6.4 cm, 8.9cm, the spacing between reinforcements gradually increases, and three corrugated pipes are arranged on the T-shaped structure as channels for prestressed reinforcement; the stress reinforcement in the model is φ16mm ribbed reinforcement, and the stirrup is φ8mm light garden reinforcement; the volume content of r...

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Abstract

The invention provides a C50 non-vibration self-flowing dense concrete used in the construction structures such as bridges, of which the mixing proportion by per cubic meter is that 375kg of concrete, 162kg of fly ash, 167kg of water, 767kg of sand, 901kg of gravel and 10.74kg of high efficiency water reducing agent; water-gel ratio is 0.325 and mortar-aggregate bond ratio is 0.352: 0.648; the invention can evenly and densely fill in a structure with dense concrete reinforcing bars and complicated physiques without stirring by relying on self weight of the concrete, which conquers the defect of structure quality of being not dense, etc.; the invention meets the requirements of C50 common concrete for working performance, mechanical property, impermeability, freezing resistance, Chloride ions diffusibility resistance, shrinkage and creep property, etc., and has good workability and little gradual loss in slump.

Description

technical field [0001] The invention relates to a vibration-free self-flowing dense concrete, in particular to a C50 vibration-free self-flowing dense concrete mix ratio applied to building structures such as bridge engineering, and belongs to the field of building materials. technical background [0002] From the late 1980s to the present, for more than 20 years, many countries have carried out a lot of research and development work on high-performance concrete, and the technology is changing with each passing day. Due to its good workability, high mechanical properties and high durability, high-performance concrete has been widely used in civil engineering, such as highway engineering, bridges, high-rise buildings, marine engineering, and important hydraulic structures. In recent years, my country is at the peak of domestic road and bridge construction. With the continuous development of modern bridges in the direction of long-span, high-tech, and s...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B18/08C04B14/06C04B14/02C04B24/24
CPCC04B28/04Y02W30/91C04B14/02C04B14/06C04B18/08C04B24/2641C04B40/0028C04B2103/302
Inventor 欧阳华林苏祖平袁立宏潘立泉周启茂欧阳辉胡贵琼姜辉
Owner CHINA RAILWAY BRIDGE SCI RES INST LTD
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