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Développement d’indicateurs pour la caractérisation mécanique et la durabilité des bois traités thermiquement

Abstract : The heat treatment of wood has been a growing industry in the last decade, but its development is curbed by the lack of certifications. Heat-treated wood is a new material whose mechanical properties and durability are modified by heat transfer and chemical reactions of biopolymers. This study aims at finding non-destructive indicators that can guarantee heat-treated wood quality. The characterization of several species heated by Bois Durables de Bourgogne first enables to assess the influence of heat treatment on various samples using small specimens free from defects. This first approach shows a marked improvement of durability ensuring uses in hazard class 4, and variations of mechanical properties depending on studied reaction. Properties that appear as the most relevant in terms of certifications are bending strength and mass loss due to heat treatment. The latter is directly linked to durability owing to studies previously led by LERMAB. At this stage vibration analysis seems to be a proper way to estimate treatment intensity. In a second part ash wood is studied under four treatment intensity, between 170 and 228 °C on large specimens. This second approach confirms that vibration analysis is an appropriate indicator to estimate mass loss, but does not predict bending strength. Wood elemental composition which has been already highlighted as an indicator by other studies is not suitable for an industrial application. On the other hand the area under the treatment chart is a global measurement which is easily available and well correlated with mean values of bending strength and mass loss.
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Simon Hannouz. Développement d’indicateurs pour la caractérisation mécanique et la durabilité des bois traités thermiquement. Mécanique des matériaux [physics.class-ph]. Ecole nationale supérieure d'arts et métiers - ENSAM, 2014. Français. ⟨NNT : 2014ENAM0047⟩. ⟨tel-01127400⟩

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