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...

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Autores principales:	Mojca Zlahtič, Nejc Thaler, Miha Humar
Formato:	article
Lenguaje:	EN
Publicado:	University of Zagreb, Faculty of Forestry and Wood Technology 2016
Materias:	load cell Picea abies tensiometer thermal modifi cation water uptake fi eld testing field testing Forestry SD1-669.5
Acceso en línea:	https://doaj.org/article/9bb06f1a5b8c46cf9ae889a19139c174
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spelling	oai:doaj.org-article:9bb06f1a5b8c46cf9ae889a19139c1742021-12-02T02:36:36ZWater Uptake of Thermally Modified Norway Spruce10.5552/drind.2015.14210012-67721847-1153https://doaj.org/article/9bb06f1a5b8c46cf9ae889a19139c1742016-01-01T00:00:00Zhttp://hrcak.srce.hr/file/221863https://doaj.org/toc/0012-6772https://doaj.org/toc/1847-1153Thermal 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.Mojca ZlahtičNejc ThalerMiha Humar University of Zagreb, Faculty of Forestry and Wood Technologyarticleload cellPicea abiestensiometerthermal modifi cationwater uptakefi eld testingfield testingForestrySD1-669.5ENDrvna Industrija, Vol 66, Iss 4, Pp 273-279 (2016)
institution	DOAJ
collection	DOAJ
language	EN
topic	load cell Picea abies tensiometer thermal modifi cation water uptake fi eld testing field testing Forestry SD1-669.5
spellingShingle	load cell Picea abies tensiometer thermal modifi cation water uptake fi eld testing field testing Forestry SD1-669.5 Mojca Zlahtič Nejc Thaler Miha Humar Water Uptake of Thermally Modified Norway Spruce
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.
format	article
author	Mojca Zlahtič Nejc Thaler Miha Humar
author_facet	Mojca Zlahtič Nejc Thaler Miha Humar
author_sort	Mojca Zlahtič
title	Water Uptake of Thermally Modified Norway Spruce
title_short	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_sort	water uptake of thermally modified norway spruce
publisher	University of Zagreb, Faculty of Forestry and Wood Technology
publishDate	2016
url	https://doaj.org/article/9bb06f1a5b8c46cf9ae889a19139c174
work_keys_str_mv	AT mojcazlahtic wateruptakeofthermallymodifiednorwayspruce AT nejcthaler wateruptakeofthermallymodifiednorwayspruce AT mihahumar wateruptakeofthermallymodifiednorwayspruce
_version_	1718402364722905088

Water Uptake of Thermally Modified Norway Spruce

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