Magnetostrictive sensors for the characterization of corrosion in rebars and prestressing strands

Keith A. Bartels; Hegeon Kwun; John J. Hanley

doi:10.1117/12.259151

13 November 1996 Magnetostrictive sensors for the characterization of corrosion in rebars and prestressing strands

Keith A. Bartels, Hegeon Kwun, John J. Hanley

Proceedings Volume 2946, Nondestructive Evaluation of Bridges and Highways; (1996) https://doi.org/10.1117/12.259151
Event: Nondestructive Evaluation Techniques for Aging Infrastructure and Manufacturing, 1996, Scottsdale, AZ, United States

Abstract

The feasibility of characterizing the severity of corrosion in reinforcing bars and prestressing strands was investigated using the magnetostrictive sensor (MsS) technique and time-frequency analysis. Relatively high bandwidth elastic waves were generated and detected in these steel members using the MsS technique. The detected signals wee then analyzed for their dispersion characteristics and attenuation with time-frequency analysis. In both rebars and strands, the wave attenuation was found to increase with an increased degree of corrosion. Wave attenuation was found to increase significantly when strands and rebar were cast in concrete. Initial studies showed that low frequencies will be needed to operate over a significant distance in concrete.

Citation Download Citation

Keith A. Bartels, Hegeon Kwun, and John J. Hanley "Magnetostrictive sensors for the characterization of corrosion in rebars and prestressing strands", Proc. SPIE 2946, Nondestructive Evaluation of Bridges and Highways, (13 November 1996); https://doi.org/10.1117/12.259151

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