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The techniques to monitor the connection between the RB and concrete are in constant development, with special focus on the ones with straightforward operation and simple non-intrusive implementation. In this work, a simple configuration is developed using 10 optical fiber sensors, allowing different sections of the same RC structure to be monitored. Since the RB may suffer different strains along its length, the location of the sensors is critical to provide an early warning about any displacement. Bragg gratings were inscribed in both silica and polymer optical fibers and these devices worked as displacement sensors by monitoring the strain variations on the fibers. The results showed that these sensors can be easily implemented in a civil construction environment, and due to the small dimensions, they can be a non-intrusive technique when multiple sensors are implemented in the same RC structure.<\/jats:p>","DOI":"10.3390\/s22228866","type":"journal-article","created":{"date-parts":[[2022,11,17]],"date-time":"2022-11-17T06:24:42Z","timestamp":1668666282000},"page":"8866","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Fiber Bragg Grating Sensors for Reinforcing Bar Slippage Detection and Bond-Slip Gradient Characterization"],"prefix":"10.3390","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6080-089X","authenticated-orcid":false,"given":"Luis","family":"Pereira","sequence":"first","affiliation":[{"name":"I3N & Department of Physics of the University of Aveiro, Campus Universit\u00e1rio de Santiago, 3810-193 Aveiro, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9905-6220","authenticated-orcid":false,"given":"Esequiel","family":"Mesquita","sequence":"additional","affiliation":[{"name":"Laboratory of Rehabilitation and Buildings Durability, Campus Russas, Federal University of Ceara, 62900-000 Russas, Cear\u00e1, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8176-7953","authenticated-orcid":false,"given":"N\u00e9lia","family":"Alberto","sequence":"additional","affiliation":[{"name":"Instituto de Telecomunica\u00e7\u00f5es and University of Aveiro, Campus Universit\u00e1rio de Santiago, 3810-193 Aveiro, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9684-351X","authenticated-orcid":false,"given":"Jos\u00e9","family":"Melo","sequence":"additional","affiliation":[{"name":"CONSTRUCT-LESE, Faculty of Engineering of the University of Porto, Department of Civil Engineering, Structural Division, 4200-465 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8596-5092","authenticated-orcid":false,"given":"Carlos","family":"Marques","sequence":"additional","affiliation":[{"name":"I3N & Department of Physics of the University of Aveiro, Campus Universit\u00e1rio de Santiago, 3810-193 Aveiro, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9129-3539","authenticated-orcid":false,"given":"Paulo","family":"Antunes","sequence":"additional","affiliation":[{"name":"I3N & Department of Physics of the University of Aveiro, Campus Universit\u00e1rio de Santiago, 3810-193 Aveiro, Portugal"},{"name":"Instituto de Telecomunica\u00e7\u00f5es and University of Aveiro, Campus Universit\u00e1rio de Santiago, 3810-193 Aveiro, Portugal"}]},{"given":"Paulo S.","family":"Andr\u00e9","sequence":"additional","affiliation":[{"name":"Instituto de Telecomunica\u00e7\u00f5es and Department of Electrical and Computer Engineering, Instituto Superior T\u00e9cnico, University of Lisbon, 1049-001 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0215-8701","authenticated-orcid":false,"given":"Humberto","family":"Varum","sequence":"additional","affiliation":[{"name":"CONSTRUCT-LESE, Faculty of Engineering of the University of Porto, Department of Civil Engineering, Structural Division, 4200-465 Porto, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2022,11,16]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"653","DOI":"10.1016\/j.conbuildmat.2016.03.094","article-title":"Experimental study of early-age bond behavior between high strength concrete and steel bars using a pull-out test","volume":"113","author":"Shen","year":"2016","journal-title":"Constr. 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