SYMPOSIA PAPER Published: 01 January 1996

Assessment of Corrosion of Steel in Concrete Structures by Magnetic Based NDE Techniques


Corrosion damage of steel in concrete structures is a major concern. NDE techniques based on variations in induced magnetic fields due to loss of steel have been shown to be an effective tool. This paper includes results from laboratory investigation, field tests, and numerical analysis based on this concept. Test specimens included reinforcing bars and prestressing cables with simulated flaws as well as flaws from real corrosion. Variations in the magnetic field were recorded as electrical signals that were characterized to aid in the detection of corrosion and evaluation of the condition of steel in concrete. It was found that the amplitude of the signals could be related to the extent of the corrosion. Loss of cross sectional area in bars and cables of approximately 3 percent could be detected by the technique. The results of a finite element analysis yielded a good agreement with those from the experiment. The technique offers significant capabilities for field assessment of the condition of steel in concrete structures.

Author Information

Ghorbanpoor, A
University of Wisconsin-Milwaukee, Milwaukee, WI
Shi, S
University of Wisconsin-Milwaukee
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Developed by Committee: G01
Pages: 119–131
DOI: 10.1520/STP16971S
ISBN-EB: 978-0-8031-5332-5
ISBN-13: 978-0-8031-2009-9