Journal of Advanced Concrete Technology
Online ISSN : 1347-3913
ISSN-L : 1346-8014
Scientific paper
Kinematics of Corrosion Damage Monitored by Acoustic Emission Techniques and Based on a Phenomenological Model
Yuma KawasakiTomoe KobaraiMasayasu Ohtsu
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2012 Volume 10 Issue 4 Pages 160-169

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Abstract

Corrosion of reinforcing steel bar is a critical issue in concrete structures. In response, a variety of techniques have been developed for early detection of corrosion phenomena, including nondestructive evaluation (NDE) techniques. Recently, we have reported that continuous acoustic emission (AE) monitoring is applicable to identify the onset of corrosion and the nucleation of corrosion-induced cracks due to the expansion of corrosion products. In order to clarify the kinematics of these AE activities in concrete, cyclic wet and dry tests on reinforced concrete beams were performed. The SiGMA (Simplified Green's functions for Moment tensor Analysis) procedure was applied to AE waveforms to locate micro-cracks and to determine kinematic information about crack types and orientations of corrosion-induced cracks. These results are visually confirmed through comparison with cracking mechanisms observed by a scanning electron micro-graph (SEM).

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© 2012 by Japan Concrete Institute
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