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

Sensors

Naasson P. de Alcantara¹  Felipe M. da Silva²  Mateus T. Guimar฾s²  Matheus D. Pereira² 

[1] Department of Electrical Engineering, São Paulo State University—Unesp, Bauru 17033-360, Brazil

关键词: reinforced concrete structures;    corrosion process;    nondestructive testing;    eddy current testing;    accelerated corrosion techniques;   

DOI  :  10.3390/s16010015

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.