Yuma Kawasaki

4 – Corrosion-induced cracks in concrete and hybrid non-destructive evaluation (NDE) for evaluation in rebar corrosion

The mechanisms of corrosion-induced cracks and evaluation methods for diagnosis are under development in concrete engineering. In order to develop acoustic emission (AE) techniques to be applicable to on-site measurement for infrastructure, hybrid-nondestructive evaluation (NDE) is under investigation. In this chapter, an accelerated corrosion test of reinforced concrete (RC) specimens was introduced. To monitor the corrosion process, AE measurement was applied, along with measuring half-cell potentials and polarization resistances at the surface of the RC specimen. Here, in order to identify the corroded area in rebar, the potential inverse BEM (PiBEM) analysis was developed and applied. Toward practical on-site measurement using NDE, damage identification of rebar corrosion due to salt attack was demonstrated.