Development of markers to predict decay durability of heat treated wood

IRG/WP 10-40496

Ž Šušteršic, A Mohareb, M Chaouch, M Pétrissans, M Petric, P Gérardin

Effect of heat treatment temperature on elemental composition of Scots pine sapwood (Pinus sylvestris) has been investigated in the range of temperatures between 220 and 250°C. Results revealed an important increase of carbon content, while oxygen content significantly decreases. Independently of the heat treatment temperature, elemental composition is strongly correlated with the mass losses due to thermal degradations. Carbons content as well as O/C ratio seem to represent valuable markers to estimate wood degradation after heat treatment. Heat treated specimens were exposed to fungal decay using the brown rot fungus Poria placenta and the weight losses due to fungal degradation were determined. Correlations between weight losses recorded after fungal exposure and elemental composition indicated that carbon content or O/C ratio can be used to predict wood durability conferred by heat treatment allowing to envisage the development of a proper method to evaluate the quality of heat treated wood and predict its durability. These results also confirm that chemical modifications of wood cell wall polymers are the main factors responsible for wood durability improvement against fungal decay after heat treatment.

Keywords: decay, durability, elemental composition, carbonaceous material, heat treatment, marker, treatment intensity

Conference: 10-05-09/13 Biarritz, France

Download document (189 kb)
free for the members of IRG.

Order document from secretariat