The steel corrosion not only reduces the cross section of the steel, but also reduces the yield strength and the ultimate strength of the steel, which is one of the reasons for the reduction of the bearing capacity of the components.
What is the damage to the structure of steel corrosion?
The change process of the influence of steel corrosion on the stress of the structure
| Cross section loss rate Ps | The influence of mechanical properties |
| 1% | There is only floating rust on the surface, and there is no effect on mechanical properties. |
| Less than 5% | The tensile force and yield strength can still be considered as the same as that of base metal. The calculation of bearing capacity should take into account the reduction of cross-section. |
| 5-10% | The tensile strength and yield strength begin to decrease |
| 10-60% | Serious corrosion, the yield point is not obvious, and the mechanical properties are seriously reduced. |
1.Steel corrosion will reduce the strength and reduce the cross-sectional area.
The steel corrosion not only reduces the cross section of the steel, but also reduces the yield strength and the ultimate strength of the steel, which is one of the reasons for the reduction of the bearing capacity of the components.
2.Corrosion of steel bar will cause cracks in concrete
The corrosion of steel bars will cause cracks in the concrete, which will cause the exfoliation of the concrete protection layer and reduce the effective cross section of the concrete components, that is, the geometric damage. Therefore, the geometric damage caused by the corrosion of reinforcing steel bars has a great influence on the bearing capacity of members.
The reinforcement corrosion will reduce the bond strength, so the effect of the bond force should be taken into full consideration in the calculation of the bearing capacity. After the loss of the bond force, it may make the reinforced bar not fully play the role, make the reinforced bar prematurely flexion, and reduce the bearing capacity of the component.
The structural strengthening method of steel corrosion to concrete structure
Prestressed FRP laminate
Enlargement section method
Steel plate bonded
Steel jacketing
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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.
Lamelles en fibres de carbone est une lamelle de composite polymère extrudé par tirage et renforcé de fibres de carbone (CPFC), destiné au renforcement des structures de béton, de bois et de maçonnerie.
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.
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