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Ultrasonic imaging of concrete-embedded corroded steel liners using linear and nonlinear evaluation

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Title: Ultrasonic imaging of concrete-embedded corroded steel liners using linear and nonlinear evaluation
Authors: Nilsson, Markus, Ulriksen, Peter, Rydén, Nils
Contributors: Lund University, Faculty of Engineering, LTH, Departments at LTH, Department of Biomedical Engineering, Division of Engineering Geology, Lunds universitet, Lunds Tekniska Högskola, Institutioner vid LTH, Institutionen för biomedicinsk teknik, Avdelningen för teknisk geologi, Originator, Lund University, Faculty of Engineering, LTH, LTH Profile areas, LTH Profile Area: The Energy Transition, Lunds universitet, Lunds Tekniska Högskola, LTH profilområden, LTH profilområde: Energiomställningen, Originator
Source: Nondestructive Testing and Evaluation Nonlinear Ultrasonic Evaluation for Corrosion Assessment of Steel Plates Embedded in Concrete. 40(8):3464-3492
Subject Terms: Engineering and Technology, Mechanical Engineering, Reliability and Maintenance, Teknik, Maskinteknik, Tillförlitlighets- och kvalitetsteknik
Description: This study explores the efficacy of horizontally polarised shear (SH) waves in ultrasonic inspection of concrete-embedded steel liner plates, focusing on corrosion detection. SH-waves are found to significantly improve the localisation and potential dimensional assessment of embedded plate-like structures compared to com- pressional (P) waves, as evidenced by SH C-scans. Anomalies corre- sponding to severe corrosion are discernible in SH C-scans, whereas they are minimally visible in P-wave scans. Nonlinear evaluation explores harmonic-based imaging, including second harmonic gen- eration (SHG) and third harmonic generation. Nonlinear SH-wave evaluation accurately locates the most severely corroded embedded plate, whereas comparative P-wave evaluations fail. However, potential FFT sidelobe contamination in the results war- rants consideration. These results suggest a promising use for non- linear waveform distortion in SH-wave-based corrosion detection though conclusive evidence of the source of SHGis uncertain. Experiments utilised an automatic scanner system for consistent control. The concrete specimen investigated herein contained pre- corroded plates which hint at heightened nonlinear effects when corrosion occurs post-embedment due to corrosion-induced crack- ing. These findings encourage further investigation into SH-waves for nonlinear ultrasonic detection of concrete-embedded steel liner plates and the development of instrumentation tailored to such methods.
Access URL: https://doi.org/10.1080/10589759.2024.2402889
Database: SwePub
Description
Abstract:This study explores the efficacy of horizontally polarised shear (SH) waves in ultrasonic inspection of concrete-embedded steel liner plates, focusing on corrosion detection. SH-waves are found to significantly improve the localisation and potential dimensional assessment of embedded plate-like structures compared to com- pressional (P) waves, as evidenced by SH C-scans. Anomalies corre- sponding to severe corrosion are discernible in SH C-scans, whereas they are minimally visible in P-wave scans. Nonlinear evaluation explores harmonic-based imaging, including second harmonic gen- eration (SHG) and third harmonic generation. Nonlinear SH-wave evaluation accurately locates the most severely corroded embedded plate, whereas comparative P-wave evaluations fail. However, potential FFT sidelobe contamination in the results war- rants consideration. These results suggest a promising use for non- linear waveform distortion in SH-wave-based corrosion detection though conclusive evidence of the source of SHGis uncertain. Experiments utilised an automatic scanner system for consistent control. The concrete specimen investigated herein contained pre- corroded plates which hint at heightened nonlinear effects when corrosion occurs post-embedment due to corrosion-induced crack- ing. These findings encourage further investigation into SH-waves for nonlinear ultrasonic detection of concrete-embedded steel liner plates and the development of instrumentation tailored to such methods.
ISSN:14772671
DOI:10.1080/10589759.2024.2402889