Corrosion Damage in Reinforced Concrete identified by AE

Deterioration and damage in reinforced concrete (RC) have been reported world-wide.   One of critical causes is a salt attack.  Thus, monitoring against corrosion damageis a key issue.  To identify the onset of corrosion and the nucleation of corrosion-induced cracks due to expansion of corrosion products, continuous acoustic emission (AE) monitoring is available.   SiGMA (Simplified Green’s functions for Moment tensor Analysis) procedure is applied to AE waveforms to identify source kinematics of micro-cracks in the corrosion process.  Results show that the onset of corrosion and the nucleation of corrosion-induced cracks in RC are visually located.  Further, corrosion damage due to the expansion of corrosion products is quantitatively identified