, Volume 12, Issue 1,pp 54-62
First online:
Characterization of three wood species (Oak, Teak and Chanul) before and after heat treatment
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Abstract
The aim of this work was to investigate the effect of heat treatment on some physical and mechanical properties of three timber species namely Oak (Tabebuia rosea), Teak (Tectona grandis) and Chanul (Humiriastrum procerum). Samples were exposed to different temperature levels: 130, 150, 180 and 210 °C for periods of 2, 4 and 8 h. The swelling values and moisture absorption of control and heat treated samples were evaluated after water immersion in 2 and 24 h. The hardness in wood was determined according to the Janka’s hardness method of the ball in three sectional planes. Stereoscopy and scanning electron microscopy were used to determine certain characteristics of cell wall like distortions related to variation of the different heat treatment conditions. Energy dispersive X-ray analysis showed some decreases in carbon content after heat treatment, and thermogravimetric analysis indicated the removal of lignin after 180 °C. The modulus of rupture, elastic modulus and proportional limit strength were also analyzed from flexural behavior. It was demonstrated that dimensional stability of three wood species was enhanced after heat treatment.
Keywords
Tropical woods Dimensional stability of wood Lignin CelluloseReferences
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http://link.springer.com/article/10.1007%2Fs13196-015-0144-4
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