Mojca Žlahtič (Author), Nejc Thaler (Author), Miha Humar (Author)

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.

Keywords

Picea abies;merilna celica;tenziometer;termična modifikacija;navzem vode;terenska testiranja;

Data

Language: Croatian
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL BF - Biotechnical Faculty
UDC: 630*813.13
COBISS: 2479241 Link will open in a new window
ISSN: 0012-6772
Views: 1210
Downloads: 332
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Other data

Secondary language: English
Secondary title: Upijanje vode toplinski modificirane norveške smreke
Type (COBISS): Not categorized
Pages: str. 273-279
Volume: ǂLet. ǂ66
Issue: ǂšt. ǂ4
Chronology: 2015
DOI: 10.5552/drind.2015.1421
ID: 9142131