Deterioration of reinforced-concrete bond strength due to corrosion
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Abstract:
The environment-induced corrosion of steel bars in concrete results in deterioration of reinforcement-concrete bond properties, and causes the damage of concrete structures. The accelerated corrosion of reinforced concrete specimens and also the pull-out test of the corroded specimens were carried out to study the deterioration of corroded reinforced-concrete bond strength. We used industrial computed tomography (ICT) scanning to exam the cracking of the concrete cover of the specimens caused by corrosion. According to the pullout tests, the ultimate shear capacity and the corresponding displacement of the corroded specimens are degraded with the corrosion extent, and the bond stiffness is depressed. The analysis based on the experimental results shows that the thickness of corrosion products, other than the corrosion ration of steel bars, influences the corroded expansion force and the degradation of bond strength more directly. By introducing the factors of the thickness of corrosion, the ratio of thickness of concrete coat to the steel bar's diameter, and the tension strength of concrete, a bond strength model of corrosion reinforced-concrete is proposed. The practicability of the suggested model is proved by experimental data.
