Structures Congress 2020
Characterization of Corrosion in PS Concrete Girders by Correlation Analysis
Publication: Structures Congress 2020
ABSTRACT
The magnetic flux leakage (MFL)-based assessment is used to detect corroded regions of steel prestressing strands in pre/post-stressed (PS) concrete girders. The MFL instrument includes two blocks of DC magnet to create a powerful magnetic field in the vicinity of the steel within the concrete girder. Hall-effect sensors are used to acquire the resulting magnetic field signals in the vertical and longitudinal directions while the MFL instrument is moved along the length of the girder. To characterize corrosion-related signals, a correlation-based analysis is implemented. This approach helped to identify the position and intensity of the corrosion in the steel. Using the correlation analysis with an idealized corrosion signal, the effects of other steel in PS concrete girders, including the conventional shear reinforcement, are removed from the test signal. An approximate percentage of section loss and length of corroded regions are estimated using this signal analysis.
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Published In
Structures Congress 2020
Pages: 285 - 292
Editor: James Gregory Soules, CB&I Storage Tank Solutions
ISBN (Online): 978-0-7844-8289-6
Copyright
© 2020 American Society of Civil Engineers.
History
Published online: Apr 2, 2020
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