Mechanical Properties of Hydrothermally Treated Beech Wood in Buffered Mediums
A Talaei A Karimi, K Yaghoobi, A Talaei
Hydrothermal treatment of beech wood in buffered mediums was carried out by aim of controlling the destructive effect of acids formed by degradation of carbohydrates on strength properties. Different mediums (water, buffer5, 7 and 8) and temperatures (160 and 180 °C) were used. Mechanical properties of specimens including modulus of rupture (MOR), modulus of elasticity (MOE) and toughness were determined. Hydrothermal treatment in buffer 5 caused a considerable loss in MOR, while treatment in buffer 8 slightly decreased the MOR. MOR losses in both temperatures were observed in buffer 5> water> buffer 7> buffer 8, respectively. MOE of all specimens showed slight increase except those treated in buffer 5. Toughness losses were obtained in buffer 5> water> buffer 7> buffer 8, respectively. Buffering the medium of hydrothermal treatment in neutral level prevents the strength loss and extends the usage of heat-treated wood in load-bearing applications.
Keywords: hydrothermal treatment, buffer, modulus of rupture, modulus of elasticity, toughness, beech