Strengthening of steel corrosion to concrete structure

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.

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.

structural strengthening method of steel corrosion to concrete structure