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Water uptake of thermally modified Norway spruce
Žlahtič, Mojca (Author), Thaler, Nejc (Author), Humar, Miha (Author)

URLURL - Presentation file, Visit http://hrcak.srce.hr/index.php?show=clanak&id_clanak_jezik=221863 This link opens in a new window

Abstract
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.

Language:Croatian
Keywords:Picea abies, merilna celica, tenziometer, termična modifikacija, navzem vode, terenska testiranja
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:BF - Biotechnical Faculty
Year:2015
Number of pages:Str. 273-279
Numbering:Let. 66, št. 4
UDC:630*813.13
ISSN on article:0012-6772
DOI:10.5552/drind.2015.1421 This link opens in a new window
COBISS.SI-ID:2479241 This link opens in a new window
Views:967
Downloads:265
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Record is a part of a journal

Title:Drvna industrija
Shortened title:Drv. ind.
Publisher:Šumarski fakultet Sveučilišta u Zagrebu, Hrvatsko šumarsko društvo, Croatiadrvo, d. d., Exportdrvo, p. o.
COBISS.SI-ID:2858754 This link opens in a new window

Secondary language

Language:English
Title:Upijanje vode toplinski modificirane norveške smreke

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