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Electrical/Mechanical Monitoring of Shape Memory Alloy Reinforcing Fibers Obtained by Pullout Tests in SMA/Cement Composite Materials

1
Department of Materials Science and Engineering, Hongik University, Seoul 04066, Korea
2
Center for Research Facilities, Kunsan National University, Kunsan 54150, Korea
3
Department of Civil Engineering, Hongik University, Seoul 04066, Korea
*
Authors to whom correspondence should be addressed.
Materials 2018, 11(2), 315; https://doi.org/10.3390/ma11020315
Received: 20 September 2017 / Revised: 15 February 2018 / Accepted: 18 February 2018 / Published: 22 February 2018
(This article belongs to the Section Advanced Composites)
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Abstract

Self-healing is an essential property of smart concrete structures. In contrast to other structural metals, shape memory alloys (SMAs) offer two unique effects: shape memory effects, and superelastic effects. Composites composed of SMA wires and conventional cements can overcome the mechanical weaknesses associated with tensile fractures in conventional concretes. Under specialized environments, the material interface between the cementitious component and the SMA materials plays an important role in achieving the enhanced mechanical performance and robustness of the SMA/cement interface. This material interface is traditionally evaluated in terms of mechanical aspects, i.e., strain–stress characteristics. However, the current work attempts to simultaneously characterize the mechanical load-displacement relationships synchronized with impedance spectroscopy as a function of displacement. Frequency-dependent impedance spectroscopy is tested as an in situ monitoring tool for structural variations in smart composites composed of non-conducting cementitious materials and conducting metals. The artificial geometry change in the SMA wires is associated with an improved anchoring action that is compatible with the smallest variation in resistance compared with prismatic SMA wires embedded into a cement matrix. The significant increase in resistance is interpreted to be associated with the slip of the SMA fibers following the elastic deformation and the debonding of the SMA fiber/matrix. View Full-Text
Keywords: smart materials; impedance spectroscopy; fiber pullout resistance; shape memory materials; geometric modification smart materials; impedance spectroscopy; fiber pullout resistance; shape memory materials; geometric modification
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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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Kim, E.-H.; Lee, H.; Kim, J.-H.; Bae, S.-M.; Hwang, H.; Yang, H.; Choi, E.; Hwang, J.-H. Electrical/Mechanical Monitoring of Shape Memory Alloy Reinforcing Fibers Obtained by Pullout Tests in SMA/Cement Composite Materials. Materials 2018, 11, 315.

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