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Materials 2019, 12(5), 813; https://doi.org/10.3390/ma12050813

Use of Non-Linear Ultrasonic Techniques to Detect Cracks Due to Steel Corrosion in Reinforced Concrete Structures

1
Civil Engineering Department, University of Alicante, 03690 Sant Vicent del Raspeig, Alicante, Spain
2
DFISTS, University of Alicante, 03690 Sant Vicent del Raspeig, Alicante, Spain
*
Author to whom correspondence should be addressed.
Received: 10 February 2019 / Revised: 28 February 2019 / Accepted: 5 March 2019 / Published: 9 March 2019
(This article belongs to the Special Issue Corrosion of Reinforcing Steel in Reinforced Concrete)
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Abstract

In this work, non-linear ultrasonic wave techniques have been used to detect the onset of micro-cracking due to steel corrosion in model reinforced concrete elements. The specimens were of prismatic shape with a single steel rebar. The corrosion was forced by admixing an appropriate amount of sodium chloride at the moment of preparing the concrete mix, and by the application of an electric field, using a constant current density power source, and making the steel rebar work as the anode, and an external counter-electrode as the cathode. The preliminary results indicate that the onset of cracking seems to be accompanied by the appearance of higher-harmonic generation at the output signal (harmonic distortion), when the system is excited by the means of an ultrasound wave with a burst central frequency. Other phenomena related to the micro-cracks induced by corrosion, such is the parametric generation with respect to the fundamental amplitude, have not been observed until now. View Full-Text
Keywords: corrosion; steel; reinforced concrete; cracking; ultrasonic wave; non-destructive detection corrosion; steel; reinforced concrete; cracking; ultrasonic wave; non-destructive detection
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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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Climent, M.Á.; Miró, M.; Carbajo, J.; Poveda, P.; de Vera, G.; Ramis, J. Use of Non-Linear Ultrasonic Techniques to Detect Cracks Due to Steel Corrosion in Reinforced Concrete Structures. Materials 2019, 12, 813.

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