51312-01627-Assessment of Corrosion in Prestressed Concrete Piles in Marine Environment with Acoustic Emission

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Product Number: 51312-01627-SG

ISBN: 01627 2012 CP

Author: William Velez

Publication Date: 2012

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Corrosion of prestressed concrete piles in splash zones is one of the main causes of bridge deterioration in marine environments. Acoustic Emission (AE) monitoring is a promising technology for detecting corrosion damage in concrete. The potential for accurate corrosion monitoring in prestressed concrete piles stands on the peculiar in-service load conditions where the prestressing forces combined with dead loads minimize flexural cracking making AE signals from corrosion cracking easier to identify. Preliminary results are presented from a pilot research aimed at investigating the capabilities of AE to monitor corrosion of the longitudinal reinforcement in prestressed concrete piles in marine environments. Prismatic prestressed concrete specimens were exposed to salt water for six months simulating tidal action. The specimens were monitored with AE sensors that were mounted at different distances from the intertidal zone to understand the effect of attenuation of the AE signals. Half-cell potential and LPR measurements were performed periodically to establish a benchmark to evaluate the AE parameters. Additional benchmarking was produced through visual inspection and SEM imaging of sliced specimens after exposure to salt water for different time periods and through mass loss measurements on bare strands that were removed from selected specimens after testing.