Strength and stiffness of thermally rectified eucalyptus wood under compression

Silva, Marcio Rogério da; Machado, Gilmara de Oliveira; Brito, José Ótávio; Calil, Carlito

doi:10.1590/s1516-14392013005000086

Cited by 21 publications

(22 citation statements)

References 24 publications

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“…The MOR results (~12-15MPa) have reached the minimum requirements found in the normative documents. Particleboards made only with eucalyptus wood achieved higher MOE values (up to 47%) than the Brazilian standard requirements (~1.7-2.7 GPa) 30 . Belini et al 19 have investigated particleboard panels reinforced with sugarcane bagasse and eucalyptus fibres impregnated with formaldehyde urea.…”

Section: Resultsmentioning

confidence: 71%

“…This is the first component to degrade being revealed by the consumption of hydroxyl groups from the water molecules. For this reason, reductions in equilibrium moisture content and thickness swelling have been reported in the literature 15,29,30 . In order to avoid any environment effect mainly on the core material, the peripherical sides of the samples were painted with epoxy polymer.…”

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confidence: 93%

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Hybrid Sandwich Particleboard Made with Sugarcane, Pínus Taeda Thermally Treated and Malva Fibre from Amazon

et al. 2017

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A multilayer particleboard panels, consisted of sugarcane bagasse reinforced composite as core material and hybrid composites made with Pinus taeda particles and Malva fibres as facing materials, were designed and evaluated in this work. Tukey test was used to identify the effect of the facing material, considering different combinations of Pinus taeda particles and Malva fibres, on the bulk density, thickness swelling, flexural strength, flexural stiffness and X-ray densitometry. A spray-up process was used to spread castor oil based polyurethane resin upon the dispersive phases followed by a hot compaction at 100 o C. The particleboards were classified as medium density panels in accordance to the Brazilian, American and Canadian Standards. All treatments reached the minimum strength except for elastic modulus. Tukey test demonstrated the flexural strength and modulus responses for all treatments were statistically similar. Hybrid particleboard consisted of 75% of Pinus taeda wood and 25% of Malva fibres revealed a promising sustainable material for furniture industries, combining strength, low-cost and lower thickness swelling values.

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Section: Resultsmentioning

confidence: 71%

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confidence: 93%

Hybrid Sandwich Particleboard Made with Sugarcane, Pínus Taeda Thermally Treated and Malva Fibre from Amazon

et al. 2017

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“…The increase in the proportional lignin content during the heat treatment was caused by degradation of the hemicelluloses and cellulose and the condensation reactions of lignin (Wikberg and Maunu 2004;Tumen et al 2010;Silva et al 2013). In our experiment, an increase in the relative content of lignin was observed at temperatures over 220 °C.…”

Section: Chemical Changesmentioning

confidence: 99%

“…According to Silva et al (2013), the increase in the MOE at lower treatment temperatures can also be caused by an increase in the crystallinity of cellulose and in the relative content of lignin. Beyond the temperature of 220 °C, the MOR of the treated wood was lower than that of the untreated wood.…”

Section: Changes In Mechanical Propertiesmentioning

confidence: 99%

The Effect of Chemical Changes during Heat Treatment on the Color and Mechanical Properties of Fir Wood

et al. 2016

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European silver fir (Abies alba L.) wood was heat-treated in an oven for 60 min at seven different temperatures of 100 °C, 150 °C, 200 °C, 220 °C, 240 °C, 260 °C, and 280 °C under atmospheric pressure in the presence of air. The effect of thermal treatment on the chemical composition, mechanical, and color properties of the wood was studied, and the mutual correlations between the investigated properties were evaluated. The bending strength/modulus of rupture (MOR) and the modulus of elasticity (MOE) were positively correlated with the total saccharides, glucose, mannose, and xylose content, where R ranged from 0.942 to 0.984. For changes in the wood color, very strong positive correlations between the total color difference and the contents of lignin and extractives were determined, where R = 0.968 and 0.945 respectively. Additionally, the total color difference was negatively correlated with the total saccharides, mannose, and xylose content, where R ranged from 0.876 to 0.938. The obtained data were evaluated by principal component analysis (PCA), where the components explained 93.1% of the total variance.

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“…The effect of thermal modification on mechanical properties of wood is complex, and the magnitude of this effect is a function of parameters such as exposure time, temperature, medium rate of heating, and the moisture content of wood (Yildiz et al 2006;Korkut and Hiziroglu 2009). The decrease in compression strength was due to the holocellulose content degradation, in which the first constituent affected was probably the hemicellulose (da Silva et al 2013). Nuopponen (2005) found that thermally treated wood specimens showed higher lignin contents than unheated wood specimens, which was the result of the degradation of hemicellulose.…”

Section: Cspg Of Impregnated and Heat-treated Oriental Beechmentioning

confidence: 99%

Mechanical Properties of Impregnated and Heat Treated Oriental Beech Wood

et al. 2016

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The main purpose of this study was to investigate mechanical properties such as the modulus of rupture (MOR) and compression strength parallel to grain (CSPG) of impregnated and heat-treated Oriental beech (Fagus orientalis L.) wood. Some copper and boron containing impregnation chemicals such as Wolmanit CX-8 (WCX-8) and Celcure AC-500 (CAC-500) were used. Wood specimens were impregnated 2% aqueous solution of the chemicals according to ASTM D1413-07e1 standard. The wood specimens were heated at 150 and 175 °C for 4 and 8 h, respectively. Results showed that both impregnation and heat treatment decreased the MOR and CSPG of Oriental beech wood. The MOR losses of Oriental beech after both treatments were higher than CSPG losses. The largest reduction of MOR and CSPG were observed with 51.5% and 15.5% for CAC-500 impregnated and heated at 175 °C for 8 h. Except for WCX-8 impregnation and heat treatment at 150 °C for 4 and 8 h, the MOR values of impregnated and heat-treated Oriental beech wood were lower than only heat-treated Oriental beech wood. It was also found that the CSPG values of impregnated and heat-treated Oriental beech wood were higher than only heat-treated Oriental beech wood, except for impregnation and heat treatment at 175 °C for 8 h.

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Strength and stiffness of thermally rectified eucalyptus wood under compression

Cited by 21 publications

References 24 publications

Hybrid Sandwich Particleboard Made with Sugarcane, Pínus Taeda Thermally Treated and Malva Fibre from Amazon

Hybrid Sandwich Particleboard Made with Sugarcane, Pínus Taeda Thermally Treated and Malva Fibre from Amazon

The Effect of Chemical Changes during Heat Treatment on the Color and Mechanical Properties of Fir Wood

Mechanical Properties of Impregnated and Heat Treated Oriental Beech Wood

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