Physical and mechanical properties of heat treated wood from Aspidosperma populifolium, dipteryx odorata and mimosa scabrella

Heat treatment improves some wood properties namely: equilibrium moisture, dimensional stability and durability and mechanical properties. In this study, the heat treatment was applied to woods of three natural species from Brazil: Aspidosperma populifolium (peroba mica), Dipteryx odorata (cumaru) a...

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Autores principales:	de Oliveira Araújo,Solange, Rocha Vital,Benedito, Oliveira,Braulio, Oliveira Carneiro,Angélica de Cássia, Lourenço,Ana, Pereira,Helena
Lenguaje:	English
Publicado:	Universidad del Bío-Bío 2016
Materias:	Aspidosperma populifolium Dipteryx odorata equilibrium moisture content mechanical properties Mimosa scabrella nitrogen heat treatment vacuum heat treatment
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2016000100015
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spelling	oai:scielo:S0718-221X20160001000152016-03-30Physical and mechanical properties of heat treated wood from Aspidosperma populifolium, dipteryx odorata and mimosa scabrellade Oliveira Araújo,SolangeRocha Vital,BeneditoOliveira,BraulioOliveira Carneiro,Angélica de CássiaLourenço,AnaPereira,Helena Aspidosperma populifolium Dipteryx odorata equilibrium moisture content mechanical properties Mimosa scabrella nitrogen heat treatment vacuum heat treatment Heat treatment improves some wood properties namely: equilibrium moisture, dimensional stability and durability and mechanical properties. In this study, the heat treatment was applied to woods of three natural species from Brazil: Aspidosperma populifolium (peroba mica), Dipteryx odorata (cumaru) and Mimosa scabrella (bracatinga). The woods were heated in an oven under vacuum and under nitrogen, at 180, 200, and 220°C for one hour. The untreated and heat-treated woods were characterized in relation to equilibrium moisture content, basic density, shrinkage, Janka hardness, and bending MOR and MOE according to NBR 7190 standards. All the thermal rectified woods showed a reduction in the hygroscopic equilibrium content, especially when the heating was under vacuum from 13-15% in the untreated woods to 1-3% for vacuum treatment at 220°C. The dimensional stability was improved to only a small extent e.g. volumetric shrinkage tended to decrease with increasing temperature. The mechanical properties were affected differently for the three wood species. Heat- treated cumaru showed increased Janka hardness, MOR and MOE; and peroba mica increased MOR and MOE but not Janka hardness; while bracatinga was less influenced by the heat treatment.info:eu-repo/semantics/openAccessUniversidad del Bío-BíoMaderas. Ciencia y tecnología v.18 n.1 20162016-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2016000100015en10.4067/S0718-221X2016005000015
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Aspidosperma populifolium Dipteryx odorata equilibrium moisture content mechanical properties Mimosa scabrella nitrogen heat treatment vacuum heat treatment
spellingShingle	Aspidosperma populifolium Dipteryx odorata equilibrium moisture content mechanical properties Mimosa scabrella nitrogen heat treatment vacuum heat treatment de Oliveira Araújo,Solange Rocha Vital,Benedito Oliveira,Braulio Oliveira Carneiro,Angélica de Cássia Lourenço,Ana Pereira,Helena Physical and mechanical properties of heat treated wood from Aspidosperma populifolium, dipteryx odorata and mimosa scabrella
description	Heat treatment improves some wood properties namely: equilibrium moisture, dimensional stability and durability and mechanical properties. In this study, the heat treatment was applied to woods of three natural species from Brazil: Aspidosperma populifolium (peroba mica), Dipteryx odorata (cumaru) and Mimosa scabrella (bracatinga). The woods were heated in an oven under vacuum and under nitrogen, at 180, 200, and 220°C for one hour. The untreated and heat-treated woods were characterized in relation to equilibrium moisture content, basic density, shrinkage, Janka hardness, and bending MOR and MOE according to NBR 7190 standards. All the thermal rectified woods showed a reduction in the hygroscopic equilibrium content, especially when the heating was under vacuum from 13-15% in the untreated woods to 1-3% for vacuum treatment at 220°C. The dimensional stability was improved to only a small extent e.g. volumetric shrinkage tended to decrease with increasing temperature. The mechanical properties were affected differently for the three wood species. Heat- treated cumaru showed increased Janka hardness, MOR and MOE; and peroba mica increased MOR and MOE but not Janka hardness; while bracatinga was less influenced by the heat treatment.
author	de Oliveira Araújo,Solange Rocha Vital,Benedito Oliveira,Braulio Oliveira Carneiro,Angélica de Cássia Lourenço,Ana Pereira,Helena
author_facet	de Oliveira Araújo,Solange Rocha Vital,Benedito Oliveira,Braulio Oliveira Carneiro,Angélica de Cássia Lourenço,Ana Pereira,Helena
author_sort	de Oliveira Araújo,Solange
title	Physical and mechanical properties of heat treated wood from Aspidosperma populifolium, dipteryx odorata and mimosa scabrella
title_short	Physical and mechanical properties of heat treated wood from Aspidosperma populifolium, dipteryx odorata and mimosa scabrella
title_full	Physical and mechanical properties of heat treated wood from Aspidosperma populifolium, dipteryx odorata and mimosa scabrella
title_fullStr	Physical and mechanical properties of heat treated wood from Aspidosperma populifolium, dipteryx odorata and mimosa scabrella
title_full_unstemmed	Physical and mechanical properties of heat treated wood from Aspidosperma populifolium, dipteryx odorata and mimosa scabrella
title_sort	physical and mechanical properties of heat treated wood from aspidosperma populifolium, dipteryx odorata and mimosa scabrella
publisher	Universidad del Bío-Bío
publishDate	2016
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2016000100015
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_version_	1714202621289431040

Physical and mechanical properties of heat treated wood from Aspidosperma populifolium, dipteryx odorata and mimosa scabrella

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