Decay Resistance of Surface Carbonized Wood

dc.contributorAalto Universityen
dc.contributor.authorKymäläinen, Maija
dc.contributor.authorBelt, Tiina
dc.contributor.authorSeppäläinen, Hanna
dc.contributor.authorRautkari, Lauri
dc.contributor.departmentWood Material Science
dc.contributor.departmentLuke Natural Resources Institute Finland
dc.contributor.departmentDepartment of Bioproducts and Biosystemsen
dc.descriptionFunding Information: This research was funded by personal postdoctoral grants from Academy of Finland, granted for project 13315408 (M.K.) and 330087 (T.B.). Publisher Copyright: © 2022 by the authors.
dc.description.abstractSurface carbonization, or charring, of wood is a one-sided modification method primarily intended for protection of exterior cladding boards. The heavily degraded surface acts as a barrier layer shielding the interior from environmental stresses, and as such acts as an organic coating. To test the durability of surfaces created in this manner, unmodified, contact charred, and flame charred spruce and birch samples were exposed to the brown rot fungus Coniophora puteana and white rot fungus Trametes versicolor for a period of nine weeks. All sides of the samples except the modified surfaces were sealed to investigate the protective effect of the surface. Mass losses were greatest for unmodified references (up to 60% and 56% for birch and spruce, respectively) and smallest for contact charred samples (up to 23% and 32%). The wood below the modified surfaces showed chemical changes typical of brown rot and simultaneous white rot. The measured glucosamine content revealed fungal biomass in both the modified surface as well as the layers beneath. According to the recorded values, the fungal biomass increased below the surface and was higher for flame charred samples in comparison to contact charred ones. This is likely due to the more intact, plasticized surface and the thicker thermally modified transition zone that restricts fungal growth more effectively in contact charred samples in comparison to the porous, cracked flame charred samples. Scanning electron microscope images verified the results by revealing fungal hyphae in all inspected wood types and species.en
dc.description.versionPeer revieweden
dc.identifier.citationKymäläinen , M , Belt , T , Seppäläinen , H & Rautkari , L 2022 , ' Decay Resistance of Surface Carbonized Wood ' , Materials , vol. 15 , no. 23 , 8410 .
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dc.publisherMDPI AG
dc.relation.ispartofseriesVolume 15, issue 23en
dc.subject.keywordbrown rot
dc.subject.keywordsurface modification
dc.subject.keywordwhite rot
dc.titleDecay Resistance of Surface Carbonized Wooden
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi