Prediction of the decay resistance of heat treated wood on the basis of its elemental composition |
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Authors: | ?iga &Scaron u&scaron ter&scaron ic,Mounir Chaouch,Marko Petri? |
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Affiliation: | a Laboratoire d'Etudes et de Recherches sur le Matériau Bois, EA 4370, Nancy Université, Faculté des Sciences et Techniques, BP 70239, F-54506 Vandoeuvre-lès-Nancy, France b University of Ljubljana, Biotechnical Faculty, Department of Wood Science & Technology, Jamnikarjeva 101, 1000 Ljubljana, Slovenia c Department of Forestry and Wood Technology, Faculty of Agriculture, 21545-El-Shatby, Alexandria University, Alexandria, Egypt |
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Abstract: | The effect of heat treatment temperature on the elemental composition of Scots pine sapwood (Pinus sylvestris) has been investigated in the range of temperatures between 220 and 250 °C. The 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. Carbon 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 us 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. |
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Keywords: | Decay Durability Elemental composition Carbon content Heat treatment Marker |
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