{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,23]],"date-time":"2026-08-23T16:04:13Z","timestamp":1787501053639,"version":"build-2736575974"},"reference-count":39,"publisher":"Public Library of Science (PLoS)","issue":"6","license":[{"start":{"date-parts":[[2023,6,28]],"date-time":"2023-06-28T00:00:00Z","timestamp":1687910400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["www.plosone.org"],"crossmark-restriction":false},"short-container-title":["PLoS ONE"],"abstract":"<jats:p>The surfaces of concrete structures are often coated with protective materials to minimize corrosion and weathering-based deterioration. Therefore, it is important to monitor the aging of the coating materials and their overall condition to extend the service lifetime of the structure effectively. Near-infrared spectroscopy (NIRS) is a contactless, nondestructive, rapid, and convenient method for material characterization; therefore, it is useful for onsite inspection of coating materials. Hence, in this study, we attempt to determine whether NIRS can be used for simple inspection for health monitoring of organic resin-based coating materials. In addition to identifying different severities of peeling damage, we characterize the ultraviolet-induced deterioration of coating materials with different thicknesses using diffuse reflection spectra acquired in the near-infrared wavelength region. For independent comparison with the NIR spectra, the state of the coating materials on the mortar specimens was analyzed using a combination of Fourier-transform infrared spectroscopy and scanning electron microscopy, while the state of the underlying mortar specimens was analyzed using permeability and salt-water immersion tests. The results confirm that the NIRS could detect the degradation of coating materials at early stages of deterioration before their permeability had been affected. NIRS offers the possibility of intermittent monitoring of coating deterioration. In addition, because the NIR spectrometer is portable, it can help in inspecting high-rise areas and areas that are difficult to reach. Therefore, we believe that NIRS is a simple, safe, and inexpensive method for inspection of surface coating materials.<\/jats:p>","DOI":"10.1371\/journal.pone.0287918","type":"journal-article","created":{"date-parts":[[2023,6,28]],"date-time":"2023-06-28T13:27:19Z","timestamp":1687958839000},"page":"e0287918","update-policy":"https:\/\/doi.org\/10.1371\/journal.pone.corrections_policy","source":"Crossref","is-referenced-by-count":3,"title":["Evaluation of near-infrared spectroscopy as a contactless method for health monitoring of resin-based coating materials applied to concrete surfaces"],"prefix":"10.1371","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2134-4307","authenticated-orcid":true,"given":"Anri","family":"Watanabe","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Masayuki","family":"Omiya","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Makoto","family":"Sato","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hiromitsu","family":"Furukawa","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nobuko","family":"Fukuda","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hiroshi","family":"Minagawa","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"340","published-online":{"date-parts":[[2023,6,28]]},"reference":[{"key":"pone.0287918.ref001","doi-asserted-by":"crossref","first-page":"123558","DOI":"10.1016\/j.jclepro.2020.123558","article-title":"The past and future of sustainable concrete: A critical review and new strategies on cement-based materials.","volume":"281","author":"J Brito","year":"2021","journal-title":"J Cleaner Prod."},{"key":"pone.0287918.ref002","doi-asserted-by":"crossref","first-page":"861","DOI":"10.1016\/S0008-8846(01)00487-2","article-title":"Accelerated testing of plain and epoxy-coated reinforcement in simulated seawater and chloride solutions.","volume":"31","author":"\u015e Erdo\u011fdu","year":"2001","journal-title":"Con Concr Res"},{"key":"pone.0287918.ref003","doi-asserted-by":"crossref","first-page":"72","DOI":"10.1016\/j.conbuildmat.2011.08.026","article-title":"Corrosion behavior of epoxy\/zinc duplex coated rebar embedded in concrete in ocean environment.","volume":"28","author":"S Dong","year":"2012","journal-title":"Constr Build Mater"},{"key":"pone.0287918.ref004","doi-asserted-by":"crossref","first-page":"437","DOI":"10.1016\/j.clay.2016.10.029","article-title":"A novel geopolymer application: Coatings to protect reinforced concrete against corrosion.","volume":"135","author":"AM Aguirre-Guerrero","year":"2017","journal-title":"Appl Clay Sci"},{"key":"pone.0287918.ref005","doi-asserted-by":"crossref","first-page":"175","DOI":"10.1016\/j.porgcoat.2011.04.005","article-title":"Performance evaluation of organic coatings against corrosion in reinforced cement mortars","volume":"72","author":"T Zafeiropoulou","year":"2011","journal-title":"Prog Org Coat"},{"key":"pone.0287918.ref006","doi-asserted-by":"crossref","first-page":"299","DOI":"10.1016\/j.conbuildmat.2016.01.026","article-title":"Evaluation of carbonation resistance of paint coated concrete for buildings.","volume":"107","author":"TY Lo","year":"2016","journal-title":"Constr Build Mater."},{"key":"pone.0287918.ref007","doi-asserted-by":"crossref","first-page":"1243","DOI":"10.1617\/s11527-013-0229-8","article-title":"The use of surface coatings to increase the service life of reinforced concrete structures for durability class XC","volume":"48","author":"H Beushausen","year":"2015","journal-title":"Mater Struct"},{"key":"pone.0287918.ref008","doi-asserted-by":"crossref","first-page":"1754","DOI":"10.1016\/j.cemconres.2004.10.033","article-title":"Performance of polyurethane-coated concrete in sewer environment","volume":"35","author":"C Vipulanandan","year":"2005","journal-title":"Cem Concr Res"},{"key":"pone.0287918.ref009","doi-asserted-by":"crossref","first-page":"94","DOI":"10.1016\/j.conbuildmat.2018.12.057","article-title":"Effect of freeze-thaw cycles on the mechanical behavior of geopolymer concrete and Portland cement concrete containing micro-encapsulated phase change materials.","volume":"200","author":"S Pilehvar","year":"2019","journal-title":"Constr Build Mater"},{"key":"pone.0287918.ref010","first-page":"57","volume":"67\u201368","author":"Z Zhang","year":"2012","journal-title":"Potential application of geopolymers as protection coatings for marine concrete III. 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