Abstract
ABSTRACT This study aimed at evaluating thermal modification in mechanical properties of Corymbia citriodora and Eucalyptus saligna woods compared with a control. To do so, three samples of each species were selected, with approximately 40 years, which had the first two three-meter long logs removed. Wood thermal modification was done through final temperatures of 140 °C, 160 °C e 180 °C for 2.5 hours, and the control as well, using a forced air circulation greenhouse. Mechanical properties tests consisted of maximum impact resistance evaluation, static bending, and fiber parallel compression. Generally, results showed that thermal modification increases wood resistance up to a certain point and reduces in the highest temperature.
Highlights
The search for solutions that aim at adding more value to planted forests is increasing
Mechanical properties tests consisted of maximum impact resistance evaluation, static bending, and fiber parallel compression
The boards were transferred to the Laboratory of Forest Products (LFP) of the Federal University of Santa Maria, where the material to carry out the study was prepared
Summary
The search for solutions that aim at adding more value to planted forests is increasing. But lower than the carbonization point, ~280 °C, (Figueroa & Moraes, 2009), applied to wood during the thermorretification process may cause resistance loss three times higher when compared to the original. These losses are triggered by excessive heat that occurs because of two different effects: the immediate and reversible, which happens only during the period in which the temperature is kept; and the permanent, which results from cell wall polymers thermal degradation (Stamm, 1964; Winandy & Rowell, 1984). Some divergences lead to believe that these changes vary among different woods and depend on parameters used in thermal treatments such as time of heat exposure
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