Performance of thermally modified spruce timber in outdoor above-ground conditions: Checking, dynamic stiffness and static bending properties

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van Blokland, JoranLinnéuniversitetet,Institutionen för skog och träteknik (SOT),Group of Forest Products (author)

Performance of thermally modified spruce timber in outdoor above-ground conditions : Checking, dynamic stiffness and static bending properties

Article/chapterEnglish2020

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2020-06-08
Basel, Switzerland :MDPI,2020
electronicrdacarrier

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LIBRIS-ID:oai:DiVA.org:lnu-95788
https://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-95788URI
https://doi.org/10.3390/app10113975DOI

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Language:English
Summary in:English

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Subject category:art swepub-publicationtype

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Previous studies have shown that thermally modified wood (TMW) performs well in outdoor, above‐ground conditions in terms of resistance to wood‐decaying fungi. Yet, little is known about the development of defects such as checks and the corresponding mechanical properties of TMW in this condition. This experiment focused on the effect of 30 months outdoor above‐ground exposure (weathering) on the degree of checking, dynamic stiffness and static bending properties of thermally modified timber (TMT) of Norway spruce. Two board pairs per log were cut from 190 logs; one board of each pair was thermally modified and the other used as control. Then, 90 board pairs were exposed to the weather in south Sweden. Surface checking and axial stiffness were monitored at six‐month intervals by using digital photography and non‐destructive tests (time‐of‐flight and resonance method) to monitor changes in the material upon weathering. Finally, all boards were tested destructively in a 4‐point static bending test following EN 408 standard. Results showed that weathering had no significance influence on static bending properties of TMT even though the degree of checking was considerably higher in TMT than unmodified timber after weathering. In particular, checks along growth rings were deeper, longer and more common in TMT after weathering, especially on the pith side of boards. The maximum depth of these checks did not depend on board orientation (i.e., which side was exposed) and exceeded limits given in strength grading standards for 7% of the modified boards included. Axial dynamic stiffness determined at 6‐month intervals was less influenced by fluctuations in moisture content for TMT compared to unmodified timber, but did not confirm the increase in the degree of checking of TMT. The presence of checks from weathering did influence failure modes in TMT; horizontal shear failure became more frequent and some boards failed in compression.

Subject headings and genre

LANTBRUKSVETENSKAPER Lantbruksvetenskap, skogsbruk och fiske Trävetenskap hsv//swe
AGRICULTURAL SCIENCES Agriculture, Forestry and Fisheries Wood Science hsv//eng
cracks
MOE
MOR
ThermoWood®
time‐of‐flight
resonance method
weathering
Forestry and Wood Technology
Skog och träteknik

Added entries (persons, corporate bodies, meetings, titles ...)

Adamopoulos, StergiosLinnéuniversitetet,Institutionen för skog och träteknik (SOT),Group of Forest Products(Swepub:lnu)stadab (author)
Ahmed, Sheikh Ali,Senior Lecturer,1977-Linnéuniversitetet,Institutionen för skog och träteknik (SOT),Avancerade material,Group of Forest Products(Swepub:lnu)shalab (author)
LinnéuniversitetetInstitutionen för skog och träteknik (SOT) (creator_code:org_t)

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In:Applied SciencesBasel, Switzerland : MDPI10:11, s. 1-252076-3417

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