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NMR-measurements for determination of local moisture content of coated wood / Jimmy Johansson in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 5 (09/2013)
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Titre : NMR-measurements for determination of local moisture content of coated wood Type de document : texte imprimé Auteurs : Jimmy Johansson, Auteur ; Åsa Blom, Auteur ; Sergey V. Dvinskikh, Auteur Année de publication : 2013 Article en page(s) : p. 601-607 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bois -- Revêtements protecteurs
Contrôle non destructif
Evaluation du risque
Humidité -- Mesure
Imagerie par résonance magnétique
Résonance magnétique nucléaireIndex. décimale : 667.9 Revêtements et enduits Résumé : Local increased moisture content (MC) in wood constructions may result in different kinds of mechanical and, especially, biological degrading problems. Therefore, it is of great importance to control the MC of the material. However, there is at present no appropriate method for determining local MC in wood without destroying the product itself. Nondestructive measurements of local MC in wood is significant for the possibility of, for instance, monitoring the in situ MC in wood constructions over time, and thereby predicting potential problems. The nuclear magnetic resonance (NMR) technique has been shown to be valuable for the measurement of MC in wood. In this study, the possibility of utilizing this technique for local MC measurement in wood has been tested on wood samples exposed to water absorption for 72 h. The samples came from three different wood species treated with paint systems available on the market. In the wood samples an artificial “crack” had been created in the paint to introduce an area where the water could easily gain access to the wood. The results show the possibility of using the NMR technique for local MC measurements in wood. The measurement area, however, must be related to the properties of the material. In the case of wood, the measurement spot must be related to the early/latewood proportions. Further, a calibration of the NMR measurement must be made in relation to the expected density variations of the material. Note de contenu : - Samples for moisture profile measurements
- Samples for MC calibration
- NMR measurements
- ExperimentalDOI : 10.1007/s11998-013-9484-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9484-4.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19779
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 10, N° 5 (09/2013) . - p. 601-607[article]Réservation
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