RESISTÊNCIA DA MADEIRA MODIFICADA TERMICAMENTE DE &lt;i&gt;Eucalyptus grandis&lt;/i&gt; W. Hill ex Maiden AO TÉRMITA DE MADEIRA SECA &lt;i&gt;Cryptotermes &lt;/i&gt;sp.

Batista, Djeison César; Nisgoski, Silvana; Oliveira, José Tarcísio da Silva; Muñiz, Graciela Inés Bolzón de; Paes, Juarez Benigno

doi:10.5902/1980509822766

Cited by 11 publications

(4 citation statements)

References 2 publications

(4 reference statements)

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“…Those dried boards were then submitted to the heat treatment process in the TWBrazil company by using the VAP HolzSysteme ® method, which consists in the heat application at high temperatures (140 and 160 °C) through saturated steam, with efficient oxygen elimination in order to obtain the Thermally Modified Timber (TMT) product, as described by Batista et al (2016).…”

Section: Methodsmentioning

confidence: 99%

Ultrasound to determinate the modulus of elasticity of heat-treated woods subjected to field test

Juizo

Carvalho

França

et al. 2019

Agraria

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This study aimed to evaluate the modulus of elasticity of heat-treated wood subjected to decaying in field environment, by employing the ultrasound technique. For this, wood of Eucalyptus grandis and Pinus taeda from a TWBrazil plantation were used. From each species were selected five trees, which were then unfolded in boards that were dried and heat-treated at the temperatures of 140 and 160 ºC. Afterwards, 75 specimens were obtained for each species, which were then exposed to the weather elements during 200 days and evaluated every 40 days, in the completely randomized design with a double factorial arrangement for the heat treatment and exposure time. In this period were collected data of the fungal decay potential in the site, and apparent specific gravity and dynamic modulus of elasticity (DMoE) from the wood samples. We verified the fungal decay potential increase with the exposure time, which also caused a reduction of the apparent specific gravity and DMoE in all treatments, for both species. E. grandis had a low stiffness loss while P. taeda had a higher loss with the increasing of exposure time, with significant differences of the species DMoE.

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Section: Methodsmentioning

confidence: 99%

Ultrasound to determinate the modulus of elasticity of heat-treated woods subjected to field test

Juizo

Carvalho

França

et al. 2019

Agraria

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“…Thermal treatment of wood emerged in European countries in the 1920s and have shown beneficial effects of the exposure of timber to temperatures close to 200 °C in dry or vapourised environments, with or without the use of nitrogen (Rapp & Sailer 2001, Metsä-Kortelainen et al 2006. In Brazil, the earliest studies of thermal treatment were conducted in the mid-1980s and the main method used commercially was the VAP HolzSysteme® (Batista et al 2015(Batista et al , 2016. Changes in the wood chemical constituents improve biological resistance by reducing hemicellulose content, hygroscopicity and generating new toxic extractives (Sivrikaya et al 2015).…”

Section: Introductionmentioning

confidence: 99%

“…Intensity of the treatment that is characterised by thermal degradation (mass loss) is strongly correlated with the biological resistance of thermally modified wood, whereby the intensity of thermal treatment leads to an increase in loss of wood mass and decrease in weight loss by wood-destroying organisms (Candelier et al 2016). However, depending on species of wood and process conditions, some results have reported limited improvement, or even loss of biological resistance, at treatment temperatures below 200 °C (Calonego et al 2010, Batista et al 2016, Candelier et al 2016. This paper was aimed at evaluating the effects of different temperatures of thermal modification (160, 180, 200, 220, and 240 °C) on the decay resistance of thermally modified Corymbia citriodora and Pinus taeda wood against brown-rot and white-rot fungi under laboratory conditions.…”

Section: Introductionmentioning

confidence: 99%

Effect of Thermal Modification on Decay Resistance of Corymbia Citriodora and Pinus Taeda Wood

Paes¹,

Brocco²,

Loiola³

et al. 2021

JTFS

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Alternative and eco-friendly technologies such as thermal modification can improve durability and dimensional stability of wood. This study evaluated the effect of thermal modification on resistance improvement of Corymbia citriodora and Pinus taeda wood against brown and white-rot fungi under laboratory conditions. Wood samples were subjected to treatment temperatures of 160, 180, 200, 220 and 240 °C in a laboratory electric furnace, under dynamic nitrogen atmosphere. A treatment temperature of 260 °C was additionally used for P. taeda. Seven planks, with dimensions of 6 cm × 16 cm × 56 cm (thickness × width × length), were used for each temperature. The thermally modified planks were transformed into prismatic test samples with dimensions of 1.9 cm × 1.9 cm × 1.9 cm. Inoculated culture bottles containing test blocks were kept in an incubation room for 12 weeks. Thermal modification temperatures at 160 and 180 °C decreased the biological resistance of C. citriodora wood. Treatment temperatures of 200, 220 and 240 °C showed satisfactory decay resistance gains for both species. Rhodonia placenta was the most degrading fungus at temperatures lower than 200 °C.

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“…Wood thermally treated can be described as a physical-chemical process that change wood anatomy and wood constituents, such cellulose, hemicellulose, lignin and extractives, performing this process under temperature varying between 150 and 280 °C on controlled atmosphere, which can be vacuum, steam or under heated oil (Batista et al, 2016b;Lee et al, 2018;Wikberg and Maunu, 2004), and for a controlled time, improving physical properties reducing shrinkage, permeability and hygroscopicity, increasing dimensional stability (Barboutis and Kamperido, 2019;Batista et al, 2018;Ribeiro et al, 2019). Otherwise, with wood constituents degradation, such as cellulose and hemicellulose, mechanical properties are reduced proportionally with thermal treatment (Chen et al, 2016;Kariz et al, 2016;Kubovský et al, 2020;Lahtela and Kärki, 2014).…”

Section: Introductionmentioning

confidence: 99%

INFLUENCE OF COMMERCIAL THERMAL TREATMENT ON Eucalyptus grandis Hill ex Maiden WOOD PROPERTIES

Oliveira

Molina

et al. 2021

Rev. Árvore

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This study aimed to evaluate the influence of commercial thermal treatment on Eucalyptus grandis considering its physical, chemical, and mechanical properties. The wood samples were heat-treated in an autoclave with saturated steam and pressure application at four different temperatures: 155, 165, 175, and 185 ºC. The physical, chemical, and mechanical properties were altered due to the heat treatment. The extractives content varied between 6.06% and 28.75%; lignin between 28.93% and 37.96%; holocellulose between 65.01% and 38.12%. The mechanical properties reduced significantly with the increase of the heat treatment temperature. Through the set of data obtained, it was possible to generate significant and high precision regression models capable of estimating such properties for heat treatment temperatures not studied experimentally, enabling the determination of the most suitable temperature of heat treatment to achieve a certain property value of the treated wood.

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RESISTÊNCIA DA MADEIRA MODIFICADA TERMICAMENTE DE <i>Eucalyptus grandis</i> W. Hill ex Maiden AO TÉRMITA DE MADEIRA SECA <i>Cryptotermes </i>sp.

Cited by 11 publications

References 2 publications

Ultrasound to determinate the modulus of elasticity of heat-treated woods subjected to field test

Ultrasound to determinate the modulus of elasticity of heat-treated woods subjected to field test

Effect of Thermal Modification on Decay Resistance of Corymbia Citriodora and Pinus Taeda Wood

INFLUENCE OF COMMERCIAL THERMAL TREATMENT ON Eucalyptus grandis Hill ex Maiden WOOD PROPERTIES

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