Corrosion Damage in Reinforced Concrete identified by AE
Yuma Kawasaki
*
New Frontier Sciences, Graduate School of Science and Technology, Kumamoto University, Japan
Misuzu Kitaura
New Frontier Sciences, Graduate School of Science and Technology, Kumamoto University, Japan
Tomoe Kobarai
New Frontier Sciences, Graduate School of Science and Technology, Kumamoto University, Japan
Masayasu Ohtsu
Department of Civil and Environmental Engineering, Graduate School of Science and Technology, Kumamoto University, Japan
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Abstract
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.
Keywords
acoustic emission; corrosion-induced cracks; reinforced concrete; salt attack; SiGMA
References
Dubravka, B., Dunja, M. and Dalibor, S. Non-Destructive Corrosion Rate Monitoring for Reinforced Concrete Structures, 2000, 15th WCNDT.
Ohtsu, M. Detection and Identification of Concrete Cracking in Reinforced Concrete by AE, Review of Progress in Quantitative NDE. 2003, AIP conference 2003, Proc. 657(22B): pp. 1455-1462.
Melchers, R. E. and Li, C. Q. Phenomenological Modeling of Reinforcement Corrosion in Marine Environments, ACI Materials Journal, 2006, 103(1): pp. 25-32.
Ohtsu, M. Simplified Moment Tensor Analysis and Unified Decomposition of Acoustic Emission Source : Application to In Situ Hydrofracturing Test, J. of Geophysical Research, 1991, 96(B4): pp. 6211-6221.
