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Sensors 2014, 14(11), 19963-19978; doi:10.3390/s141119963

An Embedded Stress Sensor for Concrete SHM Based on Amorphous Ferromagnetic Microwires

1
Instituto de Tecnologías Físicas y de la Información "Leonardo Torres Quevedo", ITEFI (CSIC), Madrid 28006, Spain
2
Instituto Tecnológico de la Construcción (AIDICO), Valencia 46980, Spain
3
Institute of Physics, Faculty of Science, University of Pavol Jozef Safarik, Kosice 040 01, Slovakia
4
Dpto. Física de Materiales, Facultad de Química, UPV/EHU, San Sebastián 20018, Spain
5
IKERBASQUE, Basque Foundation for Science, Bilbao 48011, Spain
*
Author to whom correspondence should be addressed.
Received: 22 July 2014 / Revised: 16 October 2014 / Accepted: 17 October 2014 / Published: 24 October 2014
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Abstract

A new smart concrete aggregate design as a candidate for applications in structural health monitoring (SHM) of critical elements in civil infrastructure is proposed. The cement-based stress/strain sensor was developed by utilizing the stress/strain sensing properties of a magnetic microwire embedded in cement-based composite (MMCC). This is a contact-less type sensor that measures variations of magnetic properties resulting from stress variations. Sensors made of these materials can be designed to satisfy the specific demand for an economic way to monitor concrete infrastructure health. For this purpose, we embedded a thin magnetic microwire in the core of a cement-based cylinder, which was inserted into the concrete specimen under study as an extra aggregate. The experimental results show that the embedded MMCC sensor is capable of measuring internal compressive stress around the range of 1–30 MPa. Two stress sensing properties of the embedded sensor under uniaxial compression were studied: the peak amplitude and peak position of magnetic switching field. The sensitivity values for the amplitude and position within the measured range were 5 mV/MPa and 2.5 µs/MPa, respectively. View Full-Text
Keywords: concrete; embedded sensor; ferromagnetic microwires; switching field; SHM concrete; embedded sensor; ferromagnetic microwires; switching field; SHM
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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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MDPI and ACS Style

Olivera, J.; González, M.; Fuente, J.V.; Varga, R.; Zhukov, A.; Anaya, J.J. An Embedded Stress Sensor for Concrete SHM Based on Amorphous Ferromagnetic Microwires. Sensors 2014, 14, 19963-19978.

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