Water Uptake of Thermally Modified Norway Spruce
Thermal modification of wood has been commercially available for almost twenty years but the complete mechanism of improved durability is still not completely understood. It is known that the temperature and duration of the modification influences the properties of the final products. There are seve...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
University of Zagreb, Faculty of Forestry and Wood Technology
2016-01-01
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| Series: | Drvna Industrija |
| Subjects: | |
| Online Access: | http://hrcak.srce.hr/file/221863 |
| _version_ | 1819013135823011840 |
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| author | Mojca Zlahtič Nejc Thaler Miha Humar |
| author_facet | Mojca Zlahtič Nejc Thaler Miha Humar |
| author_sort | Mojca Zlahtič |
| collection | DOAJ |
| description | Thermal modification of wood has been commercially available for almost twenty years but the complete mechanism of improved durability is still not completely understood. It is known that the temperature and duration of the modification influences the properties of the final products. There are several potential reasons for the increased durability of the modified wood. In recent research in particular, water exclusion efficiency has been identified as one of the key mechanisms. In order to elucidate this presumption, specimens made of Norway spruce heartwood were thermally modified at 6 different temperatures (160 °C, 180 °C, 190 °C, 200 °C, 210 °C and 230 °C) for three hours according to the Silvapro® procedure. Control specimens were left unmodified. Three sets of tests were performed: (a) samples were soaked in water for 4 days and then positioned on load cells and allowed to dry until a constant mass was achieved; (b) short term water uptake was determined with a tensiometer and (c) wood-water interactions were verified using constant gravimetric moisture measurement during outdoor exposure. As expected, the degree of modification was reflected in the moisture content of the wood during testing. Short and medium term water uptakes correlated quite well with the performance of wood in outdoor applications. On the other hand, long term tensiometer measurements were not in line with either short term water uptake or outdoor measurements. |
| first_indexed | 2024-12-21T01:55:08Z |
| format | Article |
| id | doaj.art-9bb06f1a5b8c46cf9ae889a19139c174 |
| institution | Directory Open Access Journal |
| issn | 0012-6772 1847-1153 |
| language | English |
| last_indexed | 2024-12-21T01:55:08Z |
| publishDate | 2016-01-01 |
| publisher | University of Zagreb, Faculty of Forestry and Wood Technology |
| record_format | Article |
| series | Drvna Industrija |
| spelling | doaj.art-9bb06f1a5b8c46cf9ae889a19139c1742022-12-21T19:19:48ZengUniversity of Zagreb, Faculty of Forestry and Wood TechnologyDrvna Industrija0012-67721847-11532016-01-0166427327910.5552/drind.2015.1421Water Uptake of Thermally Modified Norway SpruceMojca ZlahtičNejc ThalerMiha Humar Thermal modification of wood has been commercially available for almost twenty years but the complete mechanism of improved durability is still not completely understood. It is known that the temperature and duration of the modification influences the properties of the final products. There are several potential reasons for the increased durability of the modified wood. In recent research in particular, water exclusion efficiency has been identified as one of the key mechanisms. In order to elucidate this presumption, specimens made of Norway spruce heartwood were thermally modified at 6 different temperatures (160 °C, 180 °C, 190 °C, 200 °C, 210 °C and 230 °C) for three hours according to the Silvapro® procedure. Control specimens were left unmodified. Three sets of tests were performed: (a) samples were soaked in water for 4 days and then positioned on load cells and allowed to dry until a constant mass was achieved; (b) short term water uptake was determined with a tensiometer and (c) wood-water interactions were verified using constant gravimetric moisture measurement during outdoor exposure. As expected, the degree of modification was reflected in the moisture content of the wood during testing. Short and medium term water uptakes correlated quite well with the performance of wood in outdoor applications. On the other hand, long term tensiometer measurements were not in line with either short term water uptake or outdoor measurements.http://hrcak.srce.hr/file/221863load cellPicea abiestensiometerthermal modifi cationwater uptakefi eld testingfield testing |
| spellingShingle | Mojca Zlahtič Nejc Thaler Miha Humar Water Uptake of Thermally Modified Norway Spruce Drvna Industrija load cell Picea abies tensiometer thermal modifi cation water uptake fi eld testing field testing |
| title | Water Uptake of Thermally Modified Norway Spruce |
| title_full | Water Uptake of Thermally Modified Norway Spruce |
| title_fullStr | Water Uptake of Thermally Modified Norway Spruce |
| title_full_unstemmed | Water Uptake of Thermally Modified Norway Spruce |
| title_short | Water Uptake of Thermally Modified Norway Spruce |
| title_sort | water uptake of thermally modified norway spruce |
| topic | load cell Picea abies tensiometer thermal modifi cation water uptake fi eld testing field testing |
| url | http://hrcak.srce.hr/file/221863 |
| work_keys_str_mv | AT mojcazlahtic wateruptakeofthermallymodifiednorwayspruce AT nejcthaler wateruptakeofthermallymodifiednorwayspruce AT mihahumar wateruptakeofthermallymodifiednorwayspruce |