Accueil
Détail de l'auteur
Auteur Åsa Blom |
Documents disponibles écrits par cet auteur
Ajouter le résultat dans votre panier Affiner la recherche
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)
[article]
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
Réserver ce document
Exemplaires (2)
Code-barres Cote Support Localisation Section Disponibilité 15618 - Périodique Bibliothèque principale Documentaires Disponible 15679 - Périodique Bibliothèque principale Documentaires Disponible The influence of coating color, heartwood and sapwood, on moisture content and growth of microorganisms on the surface during outdoor exposure of Norway spruce boards / Tinh Sjökvist in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 3 (05/2019)
[article]
Titre : The influence of coating color, heartwood and sapwood, on moisture content and growth of microorganisms on the surface during outdoor exposure of Norway spruce boards Type de document : texte imprimé Auteurs : Tinh Sjökvist, Auteur ; Åsa Blom, Auteur Année de publication : 2019 Article en page(s) : p. 819-826 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Algues marines
Bioaccumulation
Bois -- Revêtements protecteurs
Bois extérieurs
Champignons microscopiques
Conifères
Crustacés
Durée de vie (Ingénierie)
Essais (technologie)
Polyacryliques
Polyalkydes
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : The use of wood contributes to the global transformation into a bio-based community. There are, however, challenges. The growth of mold, rot fungi, and algae on the coated surface is of major concern due to decreased aesthetic service life and shorter maintenance intervals. The colonization of a coated surface requires the presence of spores, nutrients, and a sufficient amount of water. This work studied the influence of using heartwood and sapwood on the moisture content (MC) and growth of microorganisms on the surface of coated Norway spruce boards [Picea abies (L.) Karst.]. The results revealed a relationship of heartwood samples having a lower MC and a lower or equal degree of biological growth on the coated surface than sapwood samples. The relationship was valid through a range of densities (309–548 kg/m3) and two different coating systems based on either an alkyd or an acrylic resin. Furthermore, the choice of coating color (red compared to white) affected the MC as the red-colored samples had a lower MC, combined with no growth of microorganisms. Note de contenu : - Table 1 : Density and growth ring width of the samples with the standard deviation listed in parentheses
- Measured MC and biological growth during the test period (October 12, 2011-August 26, 2016) with the standard deviation given in parenthesesDOI : 10.1007/s11998-018-00165-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-00165-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32593
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 3 (05/2019) . - p. 819-826[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 20953 - Périodique Bibliothèque principale Documentaires Disponible