Abstract
Wood is known to be a complex material, because heterogeneous, anisotropic, hygroscopic. When it is submitted to an economized pyrolysis at low temperatures (-73 to 7 degrees Kelvin), it looses a part of its absorbent nature, but has a better dimensional stability and an increased resistance to micro-organisms attacks. The present work studies, on the one hand experimental view of these heat treatments, that is to say, the measure of temperatures for different ranges in a wooden cylinder treated in bath for which following parameters varied: wood species, diameter, initial humidity of the small bar, ordered temperature and nature of bath; on the other hand, it studies heat and mass transfer phenomena taking in account conduction, wood water vaporization, chemical decomposition of wood and variations of density, humidity rate, thermal conductivity and heat capacity. To optimize treatments conditions, physico-mechanical properties of treated wood are characterized by a non destructive control as ultrasonic spectroscopy. Others methods of control were used to complete the first method: forced vibrations of wooden beams, statistical trying of flexion and compression and thermo-mechanical analysis. All results agreed and show, for studied woods (beech, poplar) a discontinuous variation around -33 degrees Kelvin for a treatment time of
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Citation Formats
Bohnke, I.
Experimental and theoretical study of thermal treatments of wood. Physico-mechanical characterization of treated woods.
France: N. p.,
1993.
Web.
Bohnke, I.
Experimental and theoretical study of thermal treatments of wood. Physico-mechanical characterization of treated woods.
France.
Bohnke, I.
1993.
"Experimental and theoretical study of thermal treatments of wood. Physico-mechanical characterization of treated woods."
France.
@misc{etde_10142804,
title = {Experimental and theoretical study of thermal treatments of wood. Physico-mechanical characterization of treated woods}
author = {Bohnke, I}
abstractNote = {Wood is known to be a complex material, because heterogeneous, anisotropic, hygroscopic. When it is submitted to an economized pyrolysis at low temperatures (-73 to 7 degrees Kelvin), it looses a part of its absorbent nature, but has a better dimensional stability and an increased resistance to micro-organisms attacks. The present work studies, on the one hand experimental view of these heat treatments, that is to say, the measure of temperatures for different ranges in a wooden cylinder treated in bath for which following parameters varied: wood species, diameter, initial humidity of the small bar, ordered temperature and nature of bath; on the other hand, it studies heat and mass transfer phenomena taking in account conduction, wood water vaporization, chemical decomposition of wood and variations of density, humidity rate, thermal conductivity and heat capacity. To optimize treatments conditions, physico-mechanical properties of treated wood are characterized by a non destructive control as ultrasonic spectroscopy. Others methods of control were used to complete the first method: forced vibrations of wooden beams, statistical trying of flexion and compression and thermo-mechanical analysis. All results agreed and show, for studied woods (beech, poplar) a discontinuous variation around -33 degrees Kelvin for a treatment time of 15 minutes. A fatigue of massive material, but strongly reduced when the material is wet and treated in bath.}
place = {France}
year = {1993}
month = {Jan}
}
title = {Experimental and theoretical study of thermal treatments of wood. Physico-mechanical characterization of treated woods}
author = {Bohnke, I}
abstractNote = {Wood is known to be a complex material, because heterogeneous, anisotropic, hygroscopic. When it is submitted to an economized pyrolysis at low temperatures (-73 to 7 degrees Kelvin), it looses a part of its absorbent nature, but has a better dimensional stability and an increased resistance to micro-organisms attacks. The present work studies, on the one hand experimental view of these heat treatments, that is to say, the measure of temperatures for different ranges in a wooden cylinder treated in bath for which following parameters varied: wood species, diameter, initial humidity of the small bar, ordered temperature and nature of bath; on the other hand, it studies heat and mass transfer phenomena taking in account conduction, wood water vaporization, chemical decomposition of wood and variations of density, humidity rate, thermal conductivity and heat capacity. To optimize treatments conditions, physico-mechanical properties of treated wood are characterized by a non destructive control as ultrasonic spectroscopy. Others methods of control were used to complete the first method: forced vibrations of wooden beams, statistical trying of flexion and compression and thermo-mechanical analysis. All results agreed and show, for studied woods (beech, poplar) a discontinuous variation around -33 degrees Kelvin for a treatment time of 15 minutes. A fatigue of massive material, but strongly reduced when the material is wet and treated in bath.}
place = {France}
year = {1993}
month = {Jan}
}