Durability of thermally modified sapwood and heartwood of Scots pine and Norway spruce in the modified double layer test

Sini Metsä-Kortelainen (Corresponding Author), Hannu Viitanen

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)

Abstract

In the present study, durability of untreated and thermally modified sapwood and heartwood of Scots pine and Norway spruce was examined using a modified double layer test. Base layer samples were partly on contact with ground where exposure conditions were harder than that in a double layer test above the ground. The base layer on ground contact gave results already after one year of exposure in Finnish climate, but the top layer of a double layer test element simulated more the situation of decking exposure. Significant differences in durability and moisture content (MC) between the wood materials were detected after six years of exposure in the field. Thermally modified pine heartwood performed very well in all layers of the test element and only minor signs of decay were found in some of the base samples. Both sapwood and heartwood of thermally modified spruce were suffering only slight amounts of decay while thermally modified pine sapwood was slightly or moderately decayed. Untreated sapwood samples of pine and spruce were severely decayed or reached failure rating after six years in the field. Untreated heartwood samples performed clearly better. The highest MCs were measured from untreated and thermally modified pine samples. Thermal modification increased significantly the durability and decreased the MC values of all wood materials.
Original languageEnglish
Pages (from-to)129-139
Number of pages11
JournalWood Material Science and Engineering
Volume12
Issue number3
DOIs
Publication statusPublished - 27 May 2017
MoE publication typeA1 Journal article-refereed

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Durability
Wood
Moisture
Hot Temperature

Keywords

  • biological durability
  • decay resistance
  • ground contact
  • heartwood
  • Norway spruce
  • sapwood
  • Scots pine
  • thermal modification

Cite this

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title = "Durability of thermally modified sapwood and heartwood of Scots pine and Norway spruce in the modified double layer test",
abstract = "In the present study, durability of untreated and thermally modified sapwood and heartwood of Scots pine and Norway spruce was examined using a modified double layer test. Base layer samples were partly on contact with ground where exposure conditions were harder than that in a double layer test above the ground. The base layer on ground contact gave results already after one year of exposure in Finnish climate, but the top layer of a double layer test element simulated more the situation of decking exposure. Significant differences in durability and moisture content (MC) between the wood materials were detected after six years of exposure in the field. Thermally modified pine heartwood performed very well in all layers of the test element and only minor signs of decay were found in some of the base samples. Both sapwood and heartwood of thermally modified spruce were suffering only slight amounts of decay while thermally modified pine sapwood was slightly or moderately decayed. Untreated sapwood samples of pine and spruce were severely decayed or reached failure rating after six years in the field. Untreated heartwood samples performed clearly better. The highest MCs were measured from untreated and thermally modified pine samples. Thermal modification increased significantly the durability and decreased the MC values of all wood materials.",
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Durability of thermally modified sapwood and heartwood of Scots pine and Norway spruce in the modified double layer test. / Metsä-Kortelainen, Sini (Corresponding Author); Viitanen, Hannu.

In: Wood Material Science and Engineering, Vol. 12, No. 3, 27.05.2017, p. 129-139.

Research output: Contribution to journalArticleScientificpeer-review

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