Testing of decay resistance of sapwood and heartwood of thermally modified Scots pine and Norway spruce

Hannu Viitanen, Sini Metsä-Kortelainen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

    Abstract

    Thermal modification at elevated temperatures changes the chemical, biological and physical properties of wood. One of the main targets of thermal modification is to increase the biological durability and decay resistance of wood. Although the effects of thermal modification on wood have been widely studied, the significance of sapwood and heartwood on the resistance of thermally modified wood has been paid less attention. In this study the effects of thermal modification at four different temperatures (170°C, 190°C, 210°C and 230°C) on resistance against soft- and brown-rot fungi of sapwood and heartwood of Scots pine and Norway spruce were investigated using accelerated laboratory test methods. Natural durability against the soft-rot micro-fungi was determined according to CEN/TS 15083-2 by measuring the mass loss and modulus of elasticity (MOE) loss after an incubation period of 32 weeks. Test material was also exposed to brown-rot fungi Coniophora puteana and Poria placenta essentially according to a mini-decay test using two exposure periods (6 and 10 weeks). On average, the soft-rot and brown-rot tests gave quite similar results. However, the brown-rot test gave slightly better durability classes than the soft-rot test. The untreated heartwood of Scots pine was more durable against decay organisms than the sapwood of Scots pine and the sapwood or heartwood of Norway spruce. The differences between sapwood and heartwood were more significant within pine than within spruce material. The thermal modification significantly increased the decay resistance of all pine and spruce samples. The higher the level of thermal modification, the better biological durability and resistance against decay will be achieved.
    Original languageEnglish
    Title of host publicationThe 41st Annual Meeting of International Research Group on Wood Protection
    Subtitle of host publicationBiarritz, France, May 9-13 2010
    Publication statusPublished - 2010
    MoE publication typeNot Eligible
    Event41st Annual Meeting of IRG-WP International Research Group on Wood Protection - Biarritz, France
    Duration: 9 May 201013 May 2010

    Conference

    Conference41st Annual Meeting of IRG-WP International Research Group on Wood Protection
    CountryFrance
    CityBiarritz
    Period9/05/1013/05/10

    Fingerprint

    decay resistance
    heartwood
    sapwood
    Pinus sylvestris
    Picea abies
    durability
    heat
    brown-rot fungi
    testing
    Picea
    soft-rot fungi
    Pinus
    wood physical properties
    Rhodonia placenta
    Coniophora puteana
    deterioration
    modulus of elasticity
    exposure duration
    temperature
    fungi

    Keywords

    • brown rot
    • decay
    • durability
    • exposure
    • heartwood
    • mass loss
    • MOE
    • moisture
    • natural durability
    • pine
    • sapwood
    • soft rot
    • spruce
    • testing
    • wood material

    Cite this

    Viitanen, H., & Metsä-Kortelainen, S. (2010). Testing of decay resistance of sapwood and heartwood of thermally modified Scots pine and Norway spruce. In The 41st Annual Meeting of International Research Group on Wood Protection: Biarritz, France, May 9-13 2010 [IRG/WP 10-40523]
    Viitanen, Hannu ; Metsä-Kortelainen, Sini. / Testing of decay resistance of sapwood and heartwood of thermally modified Scots pine and Norway spruce. The 41st Annual Meeting of International Research Group on Wood Protection: Biarritz, France, May 9-13 2010. 2010.
    @inproceedings{8604b20b7f704b3da37ff142f0bb9e6c,
    title = "Testing of decay resistance of sapwood and heartwood of thermally modified Scots pine and Norway spruce",
    abstract = "Thermal modification at elevated temperatures changes the chemical, biological and physical properties of wood. One of the main targets of thermal modification is to increase the biological durability and decay resistance of wood. Although the effects of thermal modification on wood have been widely studied, the significance of sapwood and heartwood on the resistance of thermally modified wood has been paid less attention. In this study the effects of thermal modification at four different temperatures (170°C, 190°C, 210°C and 230°C) on resistance against soft- and brown-rot fungi of sapwood and heartwood of Scots pine and Norway spruce were investigated using accelerated laboratory test methods. Natural durability against the soft-rot micro-fungi was determined according to CEN/TS 15083-2 by measuring the mass loss and modulus of elasticity (MOE) loss after an incubation period of 32 weeks. Test material was also exposed to brown-rot fungi Coniophora puteana and Poria placenta essentially according to a mini-decay test using two exposure periods (6 and 10 weeks). On average, the soft-rot and brown-rot tests gave quite similar results. However, the brown-rot test gave slightly better durability classes than the soft-rot test. The untreated heartwood of Scots pine was more durable against decay organisms than the sapwood of Scots pine and the sapwood or heartwood of Norway spruce. The differences between sapwood and heartwood were more significant within pine than within spruce material. The thermal modification significantly increased the decay resistance of all pine and spruce samples. The higher the level of thermal modification, the better biological durability and resistance against decay will be achieved.",
    keywords = "brown rot, decay, durability, exposure, heartwood, mass loss, MOE, moisture, natural durability, pine, sapwood, soft rot, spruce, testing, wood material",
    author = "Hannu Viitanen and Sini Mets{\"a}-Kortelainen",
    year = "2010",
    language = "English",
    booktitle = "The 41st Annual Meeting of International Research Group on Wood Protection",

    }

    Viitanen, H & Metsä-Kortelainen, S 2010, Testing of decay resistance of sapwood and heartwood of thermally modified Scots pine and Norway spruce. in The 41st Annual Meeting of International Research Group on Wood Protection: Biarritz, France, May 9-13 2010., IRG/WP 10-40523, 41st Annual Meeting of IRG-WP International Research Group on Wood Protection, Biarritz, France, 9/05/10.

    Testing of decay resistance of sapwood and heartwood of thermally modified Scots pine and Norway spruce. / Viitanen, Hannu; Metsä-Kortelainen, Sini.

    The 41st Annual Meeting of International Research Group on Wood Protection: Biarritz, France, May 9-13 2010. 2010. IRG/WP 10-40523.

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

    TY - GEN

    T1 - Testing of decay resistance of sapwood and heartwood of thermally modified Scots pine and Norway spruce

    AU - Viitanen, Hannu

    AU - Metsä-Kortelainen, Sini

    PY - 2010

    Y1 - 2010

    N2 - Thermal modification at elevated temperatures changes the chemical, biological and physical properties of wood. One of the main targets of thermal modification is to increase the biological durability and decay resistance of wood. Although the effects of thermal modification on wood have been widely studied, the significance of sapwood and heartwood on the resistance of thermally modified wood has been paid less attention. In this study the effects of thermal modification at four different temperatures (170°C, 190°C, 210°C and 230°C) on resistance against soft- and brown-rot fungi of sapwood and heartwood of Scots pine and Norway spruce were investigated using accelerated laboratory test methods. Natural durability against the soft-rot micro-fungi was determined according to CEN/TS 15083-2 by measuring the mass loss and modulus of elasticity (MOE) loss after an incubation period of 32 weeks. Test material was also exposed to brown-rot fungi Coniophora puteana and Poria placenta essentially according to a mini-decay test using two exposure periods (6 and 10 weeks). On average, the soft-rot and brown-rot tests gave quite similar results. However, the brown-rot test gave slightly better durability classes than the soft-rot test. The untreated heartwood of Scots pine was more durable against decay organisms than the sapwood of Scots pine and the sapwood or heartwood of Norway spruce. The differences between sapwood and heartwood were more significant within pine than within spruce material. The thermal modification significantly increased the decay resistance of all pine and spruce samples. The higher the level of thermal modification, the better biological durability and resistance against decay will be achieved.

    AB - Thermal modification at elevated temperatures changes the chemical, biological and physical properties of wood. One of the main targets of thermal modification is to increase the biological durability and decay resistance of wood. Although the effects of thermal modification on wood have been widely studied, the significance of sapwood and heartwood on the resistance of thermally modified wood has been paid less attention. In this study the effects of thermal modification at four different temperatures (170°C, 190°C, 210°C and 230°C) on resistance against soft- and brown-rot fungi of sapwood and heartwood of Scots pine and Norway spruce were investigated using accelerated laboratory test methods. Natural durability against the soft-rot micro-fungi was determined according to CEN/TS 15083-2 by measuring the mass loss and modulus of elasticity (MOE) loss after an incubation period of 32 weeks. Test material was also exposed to brown-rot fungi Coniophora puteana and Poria placenta essentially according to a mini-decay test using two exposure periods (6 and 10 weeks). On average, the soft-rot and brown-rot tests gave quite similar results. However, the brown-rot test gave slightly better durability classes than the soft-rot test. The untreated heartwood of Scots pine was more durable against decay organisms than the sapwood of Scots pine and the sapwood or heartwood of Norway spruce. The differences between sapwood and heartwood were more significant within pine than within spruce material. The thermal modification significantly increased the decay resistance of all pine and spruce samples. The higher the level of thermal modification, the better biological durability and resistance against decay will be achieved.

    KW - brown rot

    KW - decay

    KW - durability

    KW - exposure

    KW - heartwood

    KW - mass loss

    KW - MOE

    KW - moisture

    KW - natural durability

    KW - pine

    KW - sapwood

    KW - soft rot

    KW - spruce

    KW - testing

    KW - wood material

    M3 - Conference article in proceedings

    BT - The 41st Annual Meeting of International Research Group on Wood Protection

    ER -

    Viitanen H, Metsä-Kortelainen S. Testing of decay resistance of sapwood and heartwood of thermally modified Scots pine and Norway spruce. In The 41st Annual Meeting of International Research Group on Wood Protection: Biarritz, France, May 9-13 2010. 2010. IRG/WP 10-40523