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Bonding reinforced modified material and application thereof in wet joint concrete of steel-concrete composite bridge deck

A modified material and concrete technology, applied in bridges, bridge parts, bridge construction, etc., can solve the problems of low bond strength of wet joint concrete, large early tension and shrinkage creep, unsuitable early strength, etc., to achieve Reduce crack sensitivity, enhance toughness and interface resistance to crack propagation, and improve volume stability

Pending Publication Date: 2020-11-06
HUBEI CHANGJIANG ROAD & BRIDGE HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention aims to provide a kind of bond-enhancing modified material to solve the problems of low bond strength, poor crack resistance, early strength not suitable for early tension and large shrinkage and creep of existing wet joint concrete

Method used

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  • Bonding reinforced modified material and application thereof in wet joint concrete of steel-concrete composite bridge deck
  • Bonding reinforced modified material and application thereof in wet joint concrete of steel-concrete composite bridge deck
  • Bonding reinforced modified material and application thereof in wet joint concrete of steel-concrete composite bridge deck

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A bonding reinforcement modified material for steel-concrete composite bridge deck wet joint concrete, which is composed of the following components by mass percentage: expansion component 64.0%, silica fume 27.0%, early strength group 1.5%, thickening and toughening component 3.5%, water-reducing component 2.23%, shrinkage-reducing component 1.3%, viscosity-increasing and water-retaining component 0.15%, defoamer 0.32%.

[0043] In this example, the expansion component is ZY-I concrete expansion agent, the expansion source is calcium sulfoaluminate, the 7d limit expansion rate in water is 0.031%, and the 21d limit expansion rate in water is 0.004%. Other performance indicators meet the technical requirements of "Concrete Expansive Agent" GB / T 23439-2017; the specific surface area of ​​silica fume (BET method) is 20.4m 2 / g, SiO 2 The content is 87.9%, the 7d activity index is 110%, and other performance indicators meet the requirements of "Silicon Fume for Mortar and ...

Embodiment 2

[0045] A bonding reinforcement modified material for steel-concrete composite bridge deck wet joint concrete, which is composed of the following components by mass percentage: expansion component 62.0%, silica fume 28.5%, early strength group 1.8%, viscosity-increasing and toughening component 3.8%, water-reducing component 2.5%, shrink-reducing component 1.0%, viscosity-increasing and water-retaining component 0.15%, defoamer 0.25%.

[0046] In this example, the expansion component is UEA-I concrete expansion agent, the expansion source is calcium sulfoaluminate, the 7d limit expansion rate in water is 0.031%, and the 21d limit expansion rate in water is -0.006% after 7 days in water , and other performance indicators meet the technical requirements of "Concrete Expansive Agent" GB / T 23439-2017; the specific surface area of ​​silica fume (BET method) is 20.4m 2 / g, SiO 2 The content is 87.9%, the 7d activity index is 110%, and other performance indicators meet the requiremen...

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Abstract

The invention relates to a bonding reinforced modified material and an application thereof in wet joint concrete of a steel-concrete composite bridge deck. The bonding reinforced modified material iscomposed of the following components in percentage by mass: 55 to 70 percent of an expansion component, 20 to 35 percent of silica fume, 0 to 2.5 percent of an early strength component, 1.8 to 5 percent of a tackifying and toughening component, 1 to 3 percent of a water reducing component, 0.5 to 2.0 percent of a shrinkage reducing component, 0 to 0.25 percent of a tackifying and water retaining component and 0 to 1 percent of a defoaming agent. The bonding reinforced modified material provided by the invention solves the problems of cracking of wet joint concrete, cracking of new and old concrete interfaces, large early tension creep and low bonding strength of new and old concrete, and is suitable for wet joint engineering with high requirements on bonding and shrinkage creep propertiesof new and old concrete interfaces.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a bond-reinforced modified material and its application in wet joint concrete of steel-concrete composite bridge decks. Background technique [0002] The steel-concrete composite bridge adopts the method of prefabricated concrete bridge deck and cast-in-place wet joints, and steel beams are connected into composite beams through shear connectors. It is a high-performance bridge structure that is easy to quickly assemble and conforms to the national bridge construction , standardization, industrialization and industrialization requirements. The vertical and horizontal wet joints of bridge decks are the key parts to ensure the integrity of the main girder structure, and play a very important role in the force transmission between bridge decks and the distribution of loads. However, wet joints are one of the most vulnerable parts of steel-concrete composite girder bridge...

Claims

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Application Information

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IPC IPC(8): C04B24/42C04B24/38C04B28/04E01D19/06E01D19/12C04B18/14
CPCC04B40/0039C04B28/04E01D19/06E01D19/125C04B2201/50C04B2201/52C04B22/142C04B18/146C04B22/14C04B24/2623C04B2103/302C04B2103/0068C04B24/38C04B24/42C04B24/04C04B24/383C04B18/08C04B18/141C04B14/02C04B14/068Y02W30/91
Inventor 王怀才杨建波王丽静丁春燕
Owner HUBEI CHANGJIANG ROAD & BRIDGE HLDG
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