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. 2021 Mar 5;21(5):1818. doi: 10.3390/s21051818

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) Tested RC ties’ with their respective bonding technologies, with (c) and without (b) the addition of a protective silicone layer. The DOFS-instrumented rebars were monitored by means of an (d) ODiSI-A OBR interrogator [77].