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Two-year Acoustic Emission Monitoring of Natural Corrosion in Prestressed Concrete Exposed to Saltwater

WILLIAM VÉLEZ, MOHAMED ELBATANOUNY, FABIO MATTA, PAUL ZIEHL

Abstract


This paper reports on a project aimed at understanding whether acoustic emission (AE) data can be used to detect and classify corrosion in PC piles exposed to saltwater, ranging from steel depassivation to concrete cracking caused by the formation of expansive surface oxides. Experimental results are presented from three specimens representing portions of PC piles, which were directly exposed to saltwater through wet/dry cycles mimicking tidal action for up to 790 days. Corrosion activity was monitored continuously using AE sensors. Half-cell potential and polarization resistance were measured periodically to serve as benchmarks to detect steel depassivation and corrosion. Visual evidence of naturally-occurring corrosion at different stages was collected from strands that were extracted from decommissioned specimens.


DOI
10.12783/shm2017/14125

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