Investigation of some technical properties of heat-treated wood
IRG/WP 03-40266
C Bengtsson, J Jermer, A Clang, B Ek-Olausson
The objective of this study was to investigate some technical properties of heat-treated wood.
Wood heat-treated according to a process intended for wood in above-ground end-uses (European hazard class 3) was subject to the following:
· A delamination test according to EN 391 with glulam beams made of heat-treated pine (Pinus sylvestris) and spruce (Picea abies) laminations, assembled with PRF and PVAc adhesive respectively.
· Determination of the withdrawal load for screws and nails.
· Determination of the emission factor for VOC and the identification of major compounds.
Results:
· PRF adhesive performed very well whereas PVAc adhesive showed an unacceptable percentage of delamination and thus seems to be unsuitable for gluing heat-treated wood.
· There is an indication that the withdrawal load for heat-treated wood is generally lower than for untreated wood. However, the number of tests carried out was quite small and definitive conclusions are difficult to draw.
· The emission factor for the heat-treated wood, expressed as TVOC, was less than
10 µg/(m2 x h) and this was less than for untreated reference.