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Kapillärt vattenupptag tvärs fibrerna i KL‐trä – Studier i CT: Slutrapport
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.ORCID iD: 0000-0001-7270-1920
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.ORCID iD: 0000-0002-3544-8716
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.ORCID iD: 0000-0002-5869-2236
2021 (Swedish)Report (Other academic)
Abstract [en]

The project aimed to study capillary water and moisture absorption through diffusion in spruce boards across fiber direction when exposed to liquid water for 168 h, as well as the drying after that. The study was driven by the necessity of fulfilling the HusAMA YSC.122 rule that states that the surface MC of the wood must not be above 18 % when it is built in and above 16 % if surface treatment will be done. CT scanning was used to study changing MC levels in 2.25 mm layers from the wood surface as average values for each layer. The layers are named after the deepest section of the layer i.e. layer 4.5 is between 2.25 mm and 4.5 mm.

Water uptake: Results of the studies show that liquid water can penetrate down to 4.5 mm (MC >30%), even though in most cases it does not penetrate beyond 2.25 mm (surface layer). Local pockets or higher MC may nevertheless occur. None of the specimens shows liquid water penetration beyond the surface layer within the first 72 h of liquid water exposure. Neither density nor board side exposed (pith‐side or sapwood‐side) have an influence in the rate of liquid water/moisture absorption. Regarding the 18% limit established by HusAMA YSC.122, it can be reached within the first 24 hours of exposure, but its penetration is limited to around 6.75 mm of depth. Regarding the 16 % limit, a more heterogeneous behavior among specimens can be seen, with penetrations that go from 13.5 mm to 20.25 mm after 24 h of exposure.

Drying: Drying took place by samples kept in room climate in the lab with no climate control or air‐velocity regulation. The conditions were equivalent to EMC of 6 %. All layers of the wood specimens are below 18 % within 48 h when water is removed after 168 h of exposure. The 16 % limit can take from 48 to up to 140 h to be reached by all layers in the atmospheric conditions of the lab, which at the moment of the experiment were extremely dry. This factor must be taken into account when interpreting results of this experiment not only during drying, but also during water uptake. 

Place, publisher, year, edition, pages
Skellefteå: Luleå tekniska universitet, 2021. , p. 24
Series
TräCentrumNorr
Keywords [sv]
trä, CT, tomograf, kapillärt vattenupptag, KL-trä
National Category
Wood Science
Research subject
Wood Science and Engineering; Centre - WoodCenter North (TCN)
Identifiers
URN: urn:nbn:se:ltu:diva-72971OAI: oai:DiVA.org:ltu-72971DiVA, id: diva2:1541199
Funder
European Regional Development Fund (ERDF)Region VästerbottenAvailable from: 2021-03-31 Created: 2021-03-31 Last updated: 2023-09-05Bibliographically approved

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Couceiro, JoséSehlstedt-Persson, MargotHansson, Lars

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