According to the investigation data, the cause of structure cracking in engineering practice is about 80% of the cracks caused by "deformation" or cracks caused by "deformation" as the main factor, and about 20% of the cracks caused by the "load" factors.
1.Load
It includes self weight, vehicle load, crowd load, construction load, wind load, seismic load, water pressure, ice pressure, water buoyancy, soil pressure, and prestress.
2.Deformation
They include shrinkage, creep, hydration heat, environmental temperature changes, forced displacement (such as foundation or support displacement). The restraining effect and supporting friction effect between different parts of the same component.
According to the investigation data, the cause of structure cracking in engineering practice is about 80% of the cracks caused by "deformation" or cracks caused by "deformation" as the main factor, and about 20% of the cracks caused by the "load" factors.
In reinforced concrete structures, the strain of tension steel always exceeds the ultimate tensile strain of concrete, and cracks are inevitable. According to the durability requirements, when the width of the crack is less than 0.2mm, the steel bars are generally not corroded. Even if the cracks reach or slightly exceed the allowable value (0.2mm), the strength of the beams will not have obvious influence. When the cracks are large and the width is large, the stiffness of the beams will be reduced, and the reinforcement is eroded by harmful medium. Reinforcement must be carried out at this time, otherwise the service life of the bridge will be affected.
The usual methods for repairing cracks are crack repair, structural crack injection, externally bonded steel plate, externally bonded CFRP wrap, Pre-stressed FRP plate.
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HM-20 est un tissu de fibre de carbone unidirectionnelle. Lorsque mis en place par superposition d’épaisseurs du tissu sur la résine d’imprégnation époxyde HM-180C3P, il forme un système de renforcement composite.
Renfort carbone par lamelle précontrainte, ce nouveau procédé permet de traiter des ouvrages, en béton armé ou précontraint, présentant une déformation trop importante ou un manque très important de rigidité.
Adhésif à injection de fissure époxy à très forte pénétration et faible viscosité pour réparer les fissures du béton
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