THE EFFECT OF HEAT TREATMENT ON SOME PROPERTIES AND COLOUR IN EUCALYPTUS (Eucalyptus camaldulensis DEHN.) WOOD

Öner, Ünsal; Korkut, Süleyman; Atik, Celil

doi:10.4067/s0718-221x2003000200006

Cited by 45 publications

(39 citation statements)

References 3 publications

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“…Regarding the Gympie messmate wood, HL decreased by 22.3% (NF) and HT decreased by 26.9% (F) at 200 °C. Similar results have been observed in previous studies (Unsal et al 2003;Korkut et al 2008;Calonego et al 2012;Bakar et al 2013;Priadi and Hiziroglu 2013). The reduction of hardness was attributed to the decomposition of the hemicelluloses during the heating treatments.…”

Section: Mechanical Propertiessupporting

confidence: 80%

Physical and Mechanical Properties of Fast-Growing Wood Subjected to Freeze-Heat Treatments

et al. 2016

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The physical and mechanical performance of wood from the rose gum (Eucalyptus grandis) and the Gympie messmate (Eucalyptus cloeziana) species were investigated. The wood samples were treated with a twostage freeze-heat thermal process. Fast-growing trees were used for preparing test samples, which were subjected to thermal treatments. The freezing stage had the treatment temperature fixed at -22 °C for 72 h, while the temperature of the heat stage ranged from 180 to 200 °C for 3.5 h. The measurements of mass loss, density, and equilibrium moisture content were determined to better understand the mechanical properties. Static bending, compression parallel to grain, Janka hardness, and impact tests were applied to reveal changes in the mechanical behavior of the treated wood. In general, the freezing stage decreased the mass loss and increased the moisture content of wood (when combined with the heating stage), which showed the opposite trend for the heating stage. Modulus of elasticity and compression strength were increased only after the heating stage, while decrements were found for modulus of rupture, impact strength, and Janka hardness. The two-stage treatments did not prevent a decrease in the mechanical properties; however, they were helpful in preventing higher mechanical resistance losses in hardness (the Gympie messmate) and impact resistance (the rose gum).

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Section: Mechanical Propertiessupporting

confidence: 80%

Physical and Mechanical Properties of Fast-Growing Wood Subjected to Freeze-Heat Treatments

et al. 2016

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“…On the whole, the average values of L*, a* and b* decreased as the temperature and heating time rose. That was also observed by Moura and Brito (2011), Esteves et al (2008) and Unsal et al (2003) in studies with E. grandis, E. globulus and E. camaldulensis wood respectively. According to Hill (2006), physical modifications in thermally modified wood depend heavily on the conditions of the methods applied and the colorimetric modifications are related to temperature and length of treatment.…”

Section: Resultssupporting

confidence: 53%

THERMAL MODIFICATION OF Eucalyptus grandis WOOD: VARIATION OF COLORIMETRIC PARAMETERS

Cademartori

Schneid

Gatto

et al. 2013

Maderas, Cienc. tecnol.

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The color modifications in Eucalyptus grandis thermally modified wood were investigated. One hundred eighty specimens (10 x 10 x 200 mm) were prepared and thermally modified in an electric kiln for 4 and 8 h at 180-240ºC. The color parameters (L*, a*, b*, C*, h* and ΔE) were determined by the CIE-L*a*b* method on radial and tangential sections of untreated and treated wood. The results indicated the darkening of specimens in the radial and tangential sections. Both sections showed variation of L* between 73 and 30, a* between 9 and 5 and b* between 20 and 8. The thermally modified wood at 180 and 200ºC showed similar patterns, equally at 220 and 240ºC. The time of exposure indicated significance just in treatment at 200ºC.

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“…Brinell hardness also undergoes a weakening (Korkut 2008) after thermal treatment. Concerning Brinell hardness properties, hardness decreases as a function of the increased treatment intensity (Unsal et al 2003). Moreover, results show that the most decrease in hardness values were observed between untreated and treated wood with an 8% mass loss.…”

Section: Mechanical Propertiesmentioning

confidence: 61%

Heat treatment of Tunisian soft wood species: Effect on the durability, chemical modifications and mechanical properties

Elaieb

Candelier

Pétrissans³

et al. 2015

Maderas, Cienc. tecnol.

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Last decades, wood was promoted as building material. Wood heat treatment by mild pyrolysis has been reported to improve biological durability and dimensional stability of the material and constitutes an attractive « non biocidal » alternative to classical preservation treatments. Previous studies have shown that conferred properties strongly depend on the heat treatment intensity. A quality control marker based on mass loss has been developed. For several years, the increased development of Tunisian wood industry provides a significant capacity of wood production and transformation. Forests in Tunisia consist essentially of coniferous species [Aleppo pine (Pinus halepensis), Radiata pine (Pinus radiata), Maritime pine (Pinus pinaster), Stone pine (Pinus pinea)], characterised by a weak natural durability. Improved durability and fungal resistance should allow the use of Tunisian species in the wood industry. Import limitation of European species and the use of local species allow the conservation of economic value added in the country and improve the economic balance. For this reason, several Tunisian softwood species (Aleppo pine, Radiata pine and Maritime pine) have been heat-treated under vacuum atmosphere at 230°C to obtain a thermal degradation with mass losses of approximately 8, 10 and 12%. The oven device allows recording the dynamic Mass Loss (ML) during the treatment and following the thermodegradation kinetic. The chemical composition of the studied wood samples was determined before and after heat treatment. For each wood species and treatment intensity, wood chemical and mechanical analyses were performed by measuring O/C ratio, bending and hardness tests. Afterward, tests of decay resistance were performed according to the EN 113 Standard, with different fungal attacks (Poria Placenta, Coriolus Versicolor) at 22°C and 70% of humidity for 16 weeks. Results were related to the mass loss. Furthermore, intensity of thermal degradation was evaluated by TD-GC-MS. Treated and untreated wood samples were maintained during 15 minutes at 230 °C under nitrogen in the thermodesorption tube in order to analyse and compare resulting from the wood thermodegradation volatile compounds.

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THE EFFECT OF HEAT TREATMENT ON SOME PROPERTIES AND COLOUR IN EUCALYPTUS (Eucalyptus camaldulensis DEHN.) WOOD

Cited by 45 publications

References 3 publications

Physical and Mechanical Properties of Fast-Growing Wood Subjected to Freeze-Heat Treatments

Physical and Mechanical Properties of Fast-Growing Wood Subjected to Freeze-Heat Treatments

THERMAL MODIFICATION OF Eucalyptus grandis WOOD: VARIATION OF COLORIMETRIC PARAMETERS

Heat treatment of Tunisian soft wood species: Effect on the durability, chemical modifications and mechanical properties

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