Effect of fungal exposure on the strength of thermally modified Norway spruce and Scots pine

Sini Metsä-Kortelainen (Corresponding Author), Hannu Viitanen

Research output: Contribution to journalArticleScientificpeer-review

13 Citations (Scopus)

Abstract

Thermal modification at elevated temperatures changes the chemical, biological and physical properties of wood. In this study, the effects of the level of thermal modification and the decay exposure (natural durability against soft-rot microfungi) on the modulus of elasticity (MOE) and modulus of rupture (MOR) of the sapwood and heartwood of Scots pine and Norway spruce were investigated with a static bending test using a central loading method in accordance with EN 408 (1995). The results were compared with four reference wood species: Siberian larch, bangkirai, merbau and western red cedar. In general, both the thermal modification and the decay exposure decreased the strength properties. On average, the higher the thermal modification temperature, the more MOE and MOR decreased with unexposed samples and increased with decayed samples, compared with the unmodified reference samples. The strength of bangkirai was least reduced in the group of the reference wood species. On average, untreated wood material will be stronger than thermally modified wood material until wood is exposed to decaying fungi. Thermal modification at high temperatures over 210°C very effectively prevents wood from decay; however, strength properties are then affected by thermal modification itself.
Original languageEnglish
Pages (from-to)13-23
Number of pages11
JournalWood Material Science and Engineering
Volume5
Issue number1
DOIs
Publication statusPublished - 2010
MoE publication typeA1 Journal article-refereed

Fingerprint

Wood
Elastic moduli
Decay (organic)
Bending tests
Fungi
Temperature
Hot Temperature
Durability
Physical properties

Keywords

  • bending strength
  • decay resistance
  • heartwood
  • modulus of elasticity
  • modulus of rupture
  • Norway spruce
  • sapwood
  • Scots pine
  • soft rot
  • thermanl modification

Cite this

@article{311f8cbfb8a14d9d82f5cdbd4419556d,
title = "Effect of fungal exposure on the strength of thermally modified Norway spruce and Scots pine",
abstract = "Thermal modification at elevated temperatures changes the chemical, biological and physical properties of wood. In this study, the effects of the level of thermal modification and the decay exposure (natural durability against soft-rot microfungi) on the modulus of elasticity (MOE) and modulus of rupture (MOR) of the sapwood and heartwood of Scots pine and Norway spruce were investigated with a static bending test using a central loading method in accordance with EN 408 (1995). The results were compared with four reference wood species: Siberian larch, bangkirai, merbau and western red cedar. In general, both the thermal modification and the decay exposure decreased the strength properties. On average, the higher the thermal modification temperature, the more MOE and MOR decreased with unexposed samples and increased with decayed samples, compared with the unmodified reference samples. The strength of bangkirai was least reduced in the group of the reference wood species. On average, untreated wood material will be stronger than thermally modified wood material until wood is exposed to decaying fungi. Thermal modification at high temperatures over 210°C very effectively prevents wood from decay; however, strength properties are then affected by thermal modification itself.",
keywords = "bending strength, decay resistance, heartwood, modulus of elasticity, modulus of rupture, Norway spruce, sapwood, Scots pine, soft rot, thermanl modification",
author = "Sini Mets{\"a}-Kortelainen and Hannu Viitanen",
note = "Project code: 70137",
year = "2010",
doi = "10.1080/17480271003786738",
language = "English",
volume = "5",
pages = "13--23",
journal = "Wood Material Science and Engineering",
issn = "1748-0272",
publisher = "Taylor & Francis",
number = "1",

}

Effect of fungal exposure on the strength of thermally modified Norway spruce and Scots pine. / Metsä-Kortelainen, Sini (Corresponding Author); Viitanen, Hannu.

In: Wood Material Science and Engineering, Vol. 5, No. 1, 2010, p. 13-23.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Effect of fungal exposure on the strength of thermally modified Norway spruce and Scots pine

AU - Metsä-Kortelainen, Sini

AU - Viitanen, Hannu

N1 - Project code: 70137

PY - 2010

Y1 - 2010

N2 - Thermal modification at elevated temperatures changes the chemical, biological and physical properties of wood. In this study, the effects of the level of thermal modification and the decay exposure (natural durability against soft-rot microfungi) on the modulus of elasticity (MOE) and modulus of rupture (MOR) of the sapwood and heartwood of Scots pine and Norway spruce were investigated with a static bending test using a central loading method in accordance with EN 408 (1995). The results were compared with four reference wood species: Siberian larch, bangkirai, merbau and western red cedar. In general, both the thermal modification and the decay exposure decreased the strength properties. On average, the higher the thermal modification temperature, the more MOE and MOR decreased with unexposed samples and increased with decayed samples, compared with the unmodified reference samples. The strength of bangkirai was least reduced in the group of the reference wood species. On average, untreated wood material will be stronger than thermally modified wood material until wood is exposed to decaying fungi. Thermal modification at high temperatures over 210°C very effectively prevents wood from decay; however, strength properties are then affected by thermal modification itself.

AB - Thermal modification at elevated temperatures changes the chemical, biological and physical properties of wood. In this study, the effects of the level of thermal modification and the decay exposure (natural durability against soft-rot microfungi) on the modulus of elasticity (MOE) and modulus of rupture (MOR) of the sapwood and heartwood of Scots pine and Norway spruce were investigated with a static bending test using a central loading method in accordance with EN 408 (1995). The results were compared with four reference wood species: Siberian larch, bangkirai, merbau and western red cedar. In general, both the thermal modification and the decay exposure decreased the strength properties. On average, the higher the thermal modification temperature, the more MOE and MOR decreased with unexposed samples and increased with decayed samples, compared with the unmodified reference samples. The strength of bangkirai was least reduced in the group of the reference wood species. On average, untreated wood material will be stronger than thermally modified wood material until wood is exposed to decaying fungi. Thermal modification at high temperatures over 210°C very effectively prevents wood from decay; however, strength properties are then affected by thermal modification itself.

KW - bending strength

KW - decay resistance

KW - heartwood

KW - modulus of elasticity

KW - modulus of rupture

KW - Norway spruce

KW - sapwood

KW - Scots pine

KW - soft rot

KW - thermanl modification

U2 - 10.1080/17480271003786738

DO - 10.1080/17480271003786738

M3 - Article

VL - 5

SP - 13

EP - 23

JO - Wood Material Science and Engineering

JF - Wood Material Science and Engineering

SN - 1748-0272

IS - 1

ER -