Modification of static bending strength properties of Eucalyptus grandis heat-treated wood

Abstract

The present study describes the effect of thermal rectification on physical and mechanical properties of Eucalyptus grandis wood at different levels of temperature and time. Samples of Eucalyptus grandis wood (10 × 10 × 200 mm) were heat-treated at 180, 200, 220 and 240 °C during 4 and 8 hours. The mechanical properties of heat-treated and untreated samples were determined by static bending tests. The physical properties were determined by weight loss and swelling tests. The results showed that modulus of elasticity, modulus of rupture, weight loss, volumetric swelling and linear swelling were affected significantly by the thermal rectification. However, the length of exposure influenced just weight loss, while the temperature influenced all the studied properties of heat-treated wood. More significant modifications with treatments at a temperature of 200 °C or higher were found in the properties of heat-treated wood.

Physical and Mechanical Properties of Fast-Growing Wood Subjected to Freeze-Heat Treatments

“…However, the results from these works do not corroborate each other. In general, the mechanical properties of the treated wood do not follow any pattern, as they can increase (Boonstra et al 2007;Pfriem et al 2010;Todorovic et al 2012), decrease (Cademartori et al 2012Bal and Bektaş 2013;Missio et al 2016) or remain unchanged (Calonego et al 2012;Cademartori et al 2015). The effect of thermal treatments in these properties depends on the parameters of the treatment and the wood species (Hill 2006).…”

Química e colorimetria da madeira de Eucalyptus grandis W. Mill ex Maiden termorretificada

“…As alterações químicas melhoram a estabilidade dimensional, comportamento higroscópico e resistência biológica da madeira (ALMEIDA et al, 2009;BAL;BEKTAS, 2012;KORKUT, 2012;RATNASINGAM;IORAS, 2012), mas podem prejudicar suas propriedades mecânicas (SHI et al, 2007;GARCIA et al, 2012;DUNDAR et al, 2012;CADEMARTORI et al, 2012).…”

Termorretificação e Colorimetria da Madeira de Eucalyptus grandis

“…Além das alterações na cor, a termorretificação melhora o comportamento higroscópico, a estabilidade dimensional e a resistência biológica da madeira (Korkut, 2012;Almeida et al, 2009;Ratnasingam & Ioras, 2012;Bal & Bektas, 2012), em detrimento das propriedades mecânicas (Garcia et al, 2012;Dundar et al, 2012;Cademartori et al, 2012).…”