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Sensors 2016, 16(1), 15; doi:10.3390/s16010015

Corrosion Assessment of Steel Bars Used in Reinforced Concrete Structures by Means of Eddy Current Testing

Department of Electrical Engineering, São Paulo State University—Unesp, Bauru 17033-360, Brazil
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Author to whom correspondence should be addressed.
Academic Editor: Piervincenzo Rizzo
Received: 25 September 2015 / Revised: 14 December 2015 / Accepted: 19 December 2015 / Published: 24 December 2015
(This article belongs to the Section Physical Sensors)
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Abstract

This paper presents a theoretical and experimental study on the use of Eddy Current Testing (ECT) to evaluate corrosion processes in steel bars used in reinforced concrete structures. The paper presents the mathematical basis of the ECT sensor built by the authors; followed by a finite element analysis. The results obtained in the simulations are compared with those obtained in experimental tests performed by the authors. Effective resistances and inductances; voltage drops and phase angles of wound coil are calculated using both; simulated and experimental data; and demonstrate a strong correlation. The production of samples of corroded steel bars; by using an impressed current technique is also presented. The authors performed experimental tests in the laboratory using handmade sensors; and the corroded samples. In the tests four gauges; with five levels of loss-of-mass references for each one were used. The results are analyzed in the light of the loss-of-mass and show a strong linear behavior for the analyzed parameters. The conclusions emphasize the feasibility of the proposed technique and highlight opportunities for future works. View Full-Text
Keywords: reinforced concrete structures; corrosion process; nondestructive testing; eddy current testing; accelerated corrosion techniques reinforced concrete structures; corrosion process; nondestructive testing; eddy current testing; accelerated corrosion techniques
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

de Alcantara, N.P., Jr.; da Silva, F.M.; Guimarães, M.T.; Pereira, M.D. Corrosion Assessment of Steel Bars Used in Reinforced Concrete Structures by Means of Eddy Current Testing. Sensors 2016, 16, 15.

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