EFFECT OF HYDROTHERMAL AND FREEZING TREATMENT ON THE PHYSICAL AND MECHANICAL PROPERTIES OF EUCALYPTUS WOOD
Autor(a) principal: | |
---|---|
Data de Publicação: | 2017 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Revista Caatinga |
Texto Completo: | https://periodicos.ufersa.edu.br/caatinga/article/view/6207 |
Resumo: | Wood, in general, is a material with excellent properties; however, some features may limit its use. In this sense, various thermal treatments are emerging as alternatives to improve the technological properties of wood. In this context, this study aims at analyzing the effects of time and temperature (hydrothermal treatment and freezing) on the physical and mechanical properties of Eucalyptus grandis W. Hill ex Maiden. Three trees were selected, and only the heartwood was used to obtain the test body dimensions of 30 × 8 × 3 cm (length × width × thickness). The treatments were carried out at three temperatures of -20, 60, and 100°C, each at three exposure times (5, 10, and 15 h). Temperature treatment at -20°C was conducted in a domestic freezer, while the treatments at 60 and 100°C were administered in a Parr reactor, where the timber was submerged in water. Regardless of the exposure time, the timbers heat-treated at 100°C showed more efficiency, since this treatment unclogged the pores, reduced hygroscopicity, and promoted further darkening and uniformity of color, without changing the density and mechanical strength of the wood. |
id |
UFERSA-1_e3881cc59795bbd2e789406114cbd754 |
---|---|
oai_identifier_str |
oai:ojs.periodicos.ufersa.edu.br:article/6207 |
network_acronym_str |
UFERSA-1 |
network_name_str |
Revista Caatinga |
repository_id_str |
|
spelling |
EFFECT OF HYDROTHERMAL AND FREEZING TREATMENT ON THE PHYSICAL AND MECHANICAL PROPERTIES OF EUCALYPTUS WOODEFEITO DO TRATAMENTO HIDROTÉRMICO E CONGELAMENTO NAS PROPRIEDADES FÍSICAS E MECÂNICAS DA MADEIRA DE EUCALIPTOHeartwood. Parr reactor. Heat treatment.Madeira de cerne. Reator parr. Tratamento térmico.Wood, in general, is a material with excellent properties; however, some features may limit its use. In this sense, various thermal treatments are emerging as alternatives to improve the technological properties of wood. In this context, this study aims at analyzing the effects of time and temperature (hydrothermal treatment and freezing) on the physical and mechanical properties of Eucalyptus grandis W. Hill ex Maiden. Three trees were selected, and only the heartwood was used to obtain the test body dimensions of 30 × 8 × 3 cm (length × width × thickness). The treatments were carried out at three temperatures of -20, 60, and 100°C, each at three exposure times (5, 10, and 15 h). Temperature treatment at -20°C was conducted in a domestic freezer, while the treatments at 60 and 100°C were administered in a Parr reactor, where the timber was submerged in water. Regardless of the exposure time, the timbers heat-treated at 100°C showed more efficiency, since this treatment unclogged the pores, reduced hygroscopicity, and promoted further darkening and uniformity of color, without changing the density and mechanical strength of the wood.A madeira, de modo geral, é um material com excelentes propriedades, mas ressalta-se que algumas características podem limitar o seu uso. Neste sentido, alguns métodos de tratamentos térmicos vêm surgindo como alternativa para melhorar algumas propriedades tecnológicas da madeira. Neste contexto, o objetivo do trabalho foi avaliar o efeito do tempo e da temperatura do tratamento hidrotérmico e do congelamento nas propriedades físicas e mecânicas da madeira de Eucalyptus grandis W.Hill ex Maiden. Foram utilizadas três árvores, selecionando-se apenas a madeira do cerne para obtenção dos corpos de prova de dimensões 30 x 8 x 3 cm (comprimento x largura x espessura). Os tratamentos foram realizados nas temperaturas de -20, 60 e 100 °C combinados a três tempos de exposição (5, 10 e 15 horas). O tratamento na temperatura de -20 °C foi realizado em um freezer doméstico, e os tratamentos a 60 e 100 °C em um Reator Parr, onde as madeiras ficaram submersas em água. Independente do tempo de exposição, os tratamentos realizados a 100 °C mostraram-se mais eficientes, pois desobstruíram os poros, reduziram a higroscopicidade e promoveram maior escurecimento e homogeneização da cor das madeiras, sem alterar a densidade e a resistência mecânica das mesmas.Universidade Federal Rural do Semi-Árido2017-06-14info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://periodicos.ufersa.edu.br/caatinga/article/view/620710.1590/1983-21252017v30n414rcREVISTA CAATINGA; Vol. 30 No. 4 (2017); 938-946Revista Caatinga; v. 30 n. 4 (2017); 938-9461983-21250100-316Xreponame:Revista Caatingainstname:Universidade Federal Rural do Semi-Árido (UFERSA)instacron:UFERSAenghttps://periodicos.ufersa.edu.br/caatinga/article/view/6207/pdfFreitas, Fabiana Paiva deCarvalho, Ana Márcia Macedo LadeiraCarneiro, Angélica de Cássia OliveiraCanal, Wagner DavelCastro, Renato Vinícius Oliveirainfo:eu-repo/semantics/openAccess2023-07-20T11:32:47Zoai:ojs.periodicos.ufersa.edu.br:article/6207Revistahttps://periodicos.ufersa.edu.br/index.php/caatinga/indexPUBhttps://periodicos.ufersa.edu.br/index.php/caatinga/oaipatricio@ufersa.edu.br|| caatinga@ufersa.edu.br1983-21250100-316Xopendoar:2024-04-29T09:46:26.330982Revista Caatinga - Universidade Federal Rural do Semi-Árido (UFERSA)true |
dc.title.none.fl_str_mv |
EFFECT OF HYDROTHERMAL AND FREEZING TREATMENT ON THE PHYSICAL AND MECHANICAL PROPERTIES OF EUCALYPTUS WOOD EFEITO DO TRATAMENTO HIDROTÉRMICO E CONGELAMENTO NAS PROPRIEDADES FÍSICAS E MECÂNICAS DA MADEIRA DE EUCALIPTO |
title |
EFFECT OF HYDROTHERMAL AND FREEZING TREATMENT ON THE PHYSICAL AND MECHANICAL PROPERTIES OF EUCALYPTUS WOOD |
spellingShingle |
EFFECT OF HYDROTHERMAL AND FREEZING TREATMENT ON THE PHYSICAL AND MECHANICAL PROPERTIES OF EUCALYPTUS WOOD Freitas, Fabiana Paiva de Heartwood. Parr reactor. Heat treatment. Madeira de cerne. Reator parr. Tratamento térmico. |
title_short |
EFFECT OF HYDROTHERMAL AND FREEZING TREATMENT ON THE PHYSICAL AND MECHANICAL PROPERTIES OF EUCALYPTUS WOOD |
title_full |
EFFECT OF HYDROTHERMAL AND FREEZING TREATMENT ON THE PHYSICAL AND MECHANICAL PROPERTIES OF EUCALYPTUS WOOD |
title_fullStr |
EFFECT OF HYDROTHERMAL AND FREEZING TREATMENT ON THE PHYSICAL AND MECHANICAL PROPERTIES OF EUCALYPTUS WOOD |
title_full_unstemmed |
EFFECT OF HYDROTHERMAL AND FREEZING TREATMENT ON THE PHYSICAL AND MECHANICAL PROPERTIES OF EUCALYPTUS WOOD |
title_sort |
EFFECT OF HYDROTHERMAL AND FREEZING TREATMENT ON THE PHYSICAL AND MECHANICAL PROPERTIES OF EUCALYPTUS WOOD |
author |
Freitas, Fabiana Paiva de |
author_facet |
Freitas, Fabiana Paiva de Carvalho, Ana Márcia Macedo Ladeira Carneiro, Angélica de Cássia Oliveira Canal, Wagner Davel Castro, Renato Vinícius Oliveira |
author_role |
author |
author2 |
Carvalho, Ana Márcia Macedo Ladeira Carneiro, Angélica de Cássia Oliveira Canal, Wagner Davel Castro, Renato Vinícius Oliveira |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Freitas, Fabiana Paiva de Carvalho, Ana Márcia Macedo Ladeira Carneiro, Angélica de Cássia Oliveira Canal, Wagner Davel Castro, Renato Vinícius Oliveira |
dc.subject.por.fl_str_mv |
Heartwood. Parr reactor. Heat treatment. Madeira de cerne. Reator parr. Tratamento térmico. |
topic |
Heartwood. Parr reactor. Heat treatment. Madeira de cerne. Reator parr. Tratamento térmico. |
description |
Wood, in general, is a material with excellent properties; however, some features may limit its use. In this sense, various thermal treatments are emerging as alternatives to improve the technological properties of wood. In this context, this study aims at analyzing the effects of time and temperature (hydrothermal treatment and freezing) on the physical and mechanical properties of Eucalyptus grandis W. Hill ex Maiden. Three trees were selected, and only the heartwood was used to obtain the test body dimensions of 30 × 8 × 3 cm (length × width × thickness). The treatments were carried out at three temperatures of -20, 60, and 100°C, each at three exposure times (5, 10, and 15 h). Temperature treatment at -20°C was conducted in a domestic freezer, while the treatments at 60 and 100°C were administered in a Parr reactor, where the timber was submerged in water. Regardless of the exposure time, the timbers heat-treated at 100°C showed more efficiency, since this treatment unclogged the pores, reduced hygroscopicity, and promoted further darkening and uniformity of color, without changing the density and mechanical strength of the wood. |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017-06-14 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://periodicos.ufersa.edu.br/caatinga/article/view/6207 10.1590/1983-21252017v30n414rc |
url |
https://periodicos.ufersa.edu.br/caatinga/article/view/6207 |
identifier_str_mv |
10.1590/1983-21252017v30n414rc |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
https://periodicos.ufersa.edu.br/caatinga/article/view/6207/pdf |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal Rural do Semi-Árido |
publisher.none.fl_str_mv |
Universidade Federal Rural do Semi-Árido |
dc.source.none.fl_str_mv |
REVISTA CAATINGA; Vol. 30 No. 4 (2017); 938-946 Revista Caatinga; v. 30 n. 4 (2017); 938-946 1983-2125 0100-316X reponame:Revista Caatinga instname:Universidade Federal Rural do Semi-Árido (UFERSA) instacron:UFERSA |
instname_str |
Universidade Federal Rural do Semi-Árido (UFERSA) |
instacron_str |
UFERSA |
institution |
UFERSA |
reponame_str |
Revista Caatinga |
collection |
Revista Caatinga |
repository.name.fl_str_mv |
Revista Caatinga - Universidade Federal Rural do Semi-Árido (UFERSA) |
repository.mail.fl_str_mv |
patricio@ufersa.edu.br|| caatinga@ufersa.edu.br |
_version_ |
1797674026481483776 |