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Elastic and Strength Properties of Heat-Treated Beech and Birch Wood

1
Department of Wood Processing, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, 16500 Prague, Czech Republic
2
Department of Forestry and Wood Economics, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, 16500 Prague, Czech Republic
*
Author to whom correspondence should be addressed.
Forests 2018, 9(4), 197; https://doi.org/10.3390/f9040197
Received: 20 February 2018 / Revised: 20 March 2018 / Accepted: 8 April 2018 / Published: 10 April 2018
(This article belongs to the Section Forest Ecophysiology and Biology)
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Abstract

This paper deals with the impact of heat treatment on the elastic and strength properties of two diffuse porous hardwoods, namely Fagus sylvatica and Betula pendula. Two degrees of the heat treatment were used at temperatures of 165 °C and 210 °C. The dynamic and static elasticity modulus, bending strength, impact toughness, hardness, and density were tested. It is already known that an increase in treatment temperature decreases the mechanical properties and, on the other hand, leads to a better shape and dimensional stability. Higher temperatures of the heat treatment correlated with lower elastic and strength properties. In the case of higher temperature treatments, the decline of tested properties was noticeable as a result of serious changes in the chemical composition of wood. It was confirmed that at higher temperature stages of treatment, there was a more pronounced decrease in beech properties compared to those of the birch, which was the most evident in their bending strength and hardness. Our research confirmed that there is no reason to consider birch wood to be of a lesser quality, although it is regarded by foresters as an inferior tree species. After the heat treatment, the wood properties are almost the same as in the case of beech wood. View Full-Text
Keywords: heat treatment; beech; birch; thermowood; density; moisture content; mechanical properties; specific strength heat treatment; beech; birch; thermowood; density; moisture content; mechanical properties; specific strength
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Borůvka, V.; Zeidler, A.; Holeček, T.; Dudík, R. Elastic and Strength Properties of Heat-Treated Beech and Birch Wood. Forests 2018, 9, 197.

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