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A device and method for repairing vertical concrete cracks with high ductility cement-based materials

A cement-based material with high ductility technology, applied in building maintenance, construction, building construction, etc., can solve problems such as stress concentration, low adhesion between new materials and old damaged surfaces, new materials fall off, etc., to achieve enhanced Effects of toughness, fine cracks, and extended cracks on cracked specimens

Active Publication Date: 2020-09-29
HOHAI UNIV +1
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  • Application Information

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Problems solved by technology

However, this method is only aimed at the crack arrest repair of general concrete members after cracking, and does not consider that due to the existence of weak bonding areas, the bonding force between the new repair material and the old damaged surface is low, and it is easy to cause stress concentration again during use, resulting in new repairs. Supplementary material falls off as a whole

Method used

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  • A device and method for repairing vertical concrete cracks with high ductility cement-based materials
  • A device and method for repairing vertical concrete cracks with high ductility cement-based materials
  • A device and method for repairing vertical concrete cracks with high ductility cement-based materials

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Experimental program
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Embodiment

[0062] For repairing vertical cracks with a width of 1mm:

[0063] Repair material mix ratio: In 2017, Yu Jing et al. published a research paper "Matrix design for waterproof Engineered Cementitious Composites" in the journal "Construction and Building Materials" to design a PVA fiber-reinforced waterproof and high-ductility cement-based material mix ratio of cement: fly ash: Stone powder: water: sand: water reducer = 0.2:0.72:0.08:0.3:0.2:0.22, fiber volume content is 2%, tensile strain ε measured in the test tu Above 3%, the tensile strength f tu is 4.5MPa. This patent can take this mixing ratio. Considering that on-site construction has a certain degree of randomness compared with laboratory operations, the ultimate tensile strain of the high-ductility cement-based material ε tu Conservatively take it as 1.5%. According to Wang Nan's doctoral thesis "Experimental Research on the Bonding Performance of Ultra-high Toughness Cement-Based Composite Materials and Existing Co...

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Abstract

The invention discloses a device for repairing vertical concrete cracks by using a high-ductility cement-based material. The device comprises a fixation device and a template assembly. According to different crack generation positions and directions, movement is done conveniently and mounting or dismounting can be carried out simply. Besides, the invention also discloses a method for using the device. Repairing zones including weak bonding segments and bonding segments are arranged at the two sides of a to-be-repaired crack; and then crack repairing is carried out by using the device. The device is convenient to mount or dismount; and with the high flexibility of the high-ductility cement-based material, the flexibility of the repairing zone is enhanced and thus the crack repairing weak zone can be enhanced.

Description

technical field [0001] The invention belongs to the technical field of concrete reinforcement, and relates to a device and method for repairing cracks in damaged concrete walls by using a high-ductility cement-based material that can produce multiple fine and dense cracks under the action of tensile load. Background technique [0002] The commonly used concrete crack repair technology is to grout the old concrete cracks, chisel the old concrete repair surface, and use mortar and other plaster repairs. However, due to the low crack resistance of the mortar, the cracks are concentrated in one place, and the repair layer is prone to repeated cracking, and forms a wide main crack that runs through the old cracks, which cannot fully achieve the purpose of crack arrest, repair and protection of the building structure. [0003] In view of the above problems, the invention application 200510046878.X discloses a mix ratio of cement-based composite materials with multi-slit developmen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04G23/02
CPCE04G23/0203
Inventor 侯利军周元斌郭尚吉庆伟周秉轩董洪汉陈达欧阳峰
Owner HOHAI UNIV
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