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High-performance expanded hybrid fiber concrete material for wet joints, and preparation method thereof

A hybrid fiber and concrete technology, which is applied in the field of high-performance expanded hybrid fiber reinforced concrete materials and its preparation, can solve the problems of increased strain, fatigue failure, and reduced beam stiffness of beam concrete, ordinary steel bars and prestressed steel bars, etc. Add simple and convenient, improve fatigue resistance, improve the effect of mechanical properties

Inactive Publication Date: 2017-11-10
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The existing technology is to add prestressed steel bars at the wet joints and post-cast high-strength fiber-expanded concrete, but engineering practice shows that repeated loading can significantly reduce the stiffness of the beam body, and make the beam body concrete, ordinary steel bars and prestressed steel bars stronger. As the strain increases, it is easy to cause fatigue damage under the action of repeated loads; how to make full use of the advantages of the first simply supported and then continuous girder bridges and overcome its inherent weaknesses has become a problem that the engineering community has been seeking to solve

Method used

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  • High-performance expanded hybrid fiber concrete material for wet joints, and preparation method thereof
  • High-performance expanded hybrid fiber concrete material for wet joints, and preparation method thereof

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Effect test

Embodiment 1

[0036] A new type of high-strength hybrid fiber concrete wet joint material for simply supported and then continuous girder bridges, which is made by mixing the following raw materials in parts by weight: 11.25 kg of cement, 1.125 kg of fly ash, 0.625 kg of silica fume, 26.625 kg of stone, Sand 16.5 kg, water 4.375 kg, water reducer (Kao) 0.09 kg, steel fiber 1.26 kg, polypropylene fiber 0.025 kg. The cement is Huangshihua brand 52.5 Portland cement; the fly ash is Class I fly ash with a specific surface area of ​​4800cm 2 / g; the silica fume is silica fume; the stone is crushed stone, small stone 5mm-10mm, large stone 10mm-20mm, the ratio of large stone to small stone is 55%, 45%; the sand is machine-made sand, The fineness modulus is 2.7, the mud content is ≤1.4%, the stone powder content is 8.3%, and the gradation is continuous and good; the water mentioned is clean tap water; the water reducer is JM-Ⅱ coagulation high-efficiency water reducer, The water reducing rate is 2...

Embodiment 2

[0043] A new type of high-strength hybrid fiber concrete wet joint material for simply supported and then continuous girder bridges, which is made by mixing the following raw materials in parts by weight: 11.25 kg of cement, 1.125 kg of fly ash, 0.625 kg of silica fume, 26.625 kg of stone, 16.5 kg of sand, 4.375 kg of water, 0.09 kg of water reducing agent (Kao), 1.15 kg of steel fiber, and 0.030 kg of polypropylene fiber. The cement is Huangshihua brand 52.5 Portland cement; the fly ash is Class I fly ash with a specific surface area of ​​4800cm 2 / g; the silica fume is silica fume; the stone is crushed stone, small stone 5mm-10mm, large stone 10mm-20mm, the ratio of large stone to small stone is 55%, 45%; the sand is machine-made sand, The fineness modulus is 2.7, the mud content is ≤1.4%, the stone powder content is 8.3%, and the gradation is continuous and good; the water mentioned is clean tap water; the water reducer is JM-Ⅱ coagulation high-efficiency water reducer, Th...

Embodiment 3

[0050] A new type of high-strength hybrid fiber concrete wet joint material for simply supported and then continuous girder bridges, which is made by mixing the following raw materials in parts by weight: 11.25 kg of cement, 1.125 kg of fly ash, 0.625 kg of silica fume, 26.625 kg of stone, 16.5 kg of sand, 4.375 kg of water, 0.09 kg of water reducing agent (Kao), 1.10 kg of steel fiber, and 0.040 kg of polypropylene fiber. The cement is Huangshihua brand 52.5 Portland cement; the fly ash is Class I fly ash with a specific surface area of ​​4800cm 2 / g; the silica fume is silica fume; the stone is crushed stone, small stone 5mm-10mm, large stone 10mm-20mm, the ratio of large stone to small stone is 55%, 45%; the sand is machine-made sand, The fineness modulus is 2.7, the mud content is ≤1.4%, the stone powder content is 8.3%, and the gradation is continuous and good; the water mentioned is clean tap water; the water reducer is JM-Ⅱ coagulation high-efficiency water reducer, Th...

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Abstract

The invention provides a high-performance expanded hybrid fiber concrete material for wet joints, and a preparation method thereof. According to the present invention, based on the practical problems of the wet joint in the whole simply supported-continuous structure system, high-strength hybrid fiber reinforced concrete is used as a joint material to provide the hybrid effect at different levels and different load applying stages so as to well inhibit and restrict the development of cracks, wherein the development of the concrete micro-crack is limited by releasing the concentrated force of the micro-crack in the concrete with Durafibers, the development of the macro-crack is limited by steel fibers, and by mixing the Durafibers and the steel fibers, a variety of mechanical properties of the whole concrete can be improved in the case of the low doping volume, such that the concrete can have characteristics of high bending resistance, high toughness, high impermeability, high fatigue resistance and the like so as to prevent the occurrence of diseases.

Description

technical field [0001] The invention belongs to the technical field of civil engineering and road traffic materials, and in particular relates to a high-performance expansion hybrid fiber concrete material used for wet joints and a preparation method thereof. Background technique [0002] With the rapid development of expressways, the number of required viaduct bridges has increased significantly, and high-speed driving requires the bridges on the highway to have high quality, that is, to have better continuity and less expansion joints. To provide high-speed, stable and comfortable driving conditions. Modern bridge engineering technology, with the continuous and in-depth research of bridge theory, has put forward higher requirements for the bridge structure system from the perspective of convenient construction, economical operation, reasonable force, especially the smooth operation of vehicles and the comfort of passengers. After simple support, the continuous structural ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B14/48C04B16/06C04B20/00C04B22/14
CPCC04B14/48C04B16/0633C04B20/0052C04B22/148C04B28/04C04B2201/50C04B14/02C04B14/06C04B18/08C04B18/146C04B2103/22C04B22/002
Inventor 任志刚王丹丹柳臻魏巍
Owner WUHAN UNIV OF TECH
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