Effect of high temperature treatment on the mechanical properties of birch (Betula papyrifera)

Poncsák, Sándor; Kocaefe, Duygu; Bouazara, Mohamed; Pichette, André

doi:10.1007/s00226-006-0082-9

Cited by 220 publications

(150 citation statements)

References 10 publications

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“…The reduction occurred evenly as the temperature increased. This effect of temperature on the screw direct withdrawal load resistance was also confirmed by Kariz et al (2013) and Poncsák et al (2006). The decrease in the screw direct withdrawal load resistance of thermally modified wood at 220 °C was around 32% compared to that of native wood.…”

Section: Screw Direct Withdrawal Load Resistancesupporting

confidence: 60%

Impact of Thermal Modification of Spruce Wood on Screw Direct Withdrawal Load Resistance

Gašparík¹,

Barcík²,

Borůvka³

et al. 2015

BioResources

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This paper reports on the dependence of screw direct withdrawal load resistance on thermal modification of spruce wood. Screw direct withdrawal load resistance was measured in native and thermally modified spruce wood. The thermal modification was performed at three different temperatures: 140, 180, and 220 °C. Tests were carried out using two types of screws in three anatomical directions. The effect of the thermal modification was unambiguous: the screw direct withdrawal load resistance decreased with increasing modification temperatures. The largest decline 44.2% was found in the axial direction and at a temperature of 200 °C, while the lowest decrease 4.1% was found in radial direction and at temperature 140 °C for conventional screws without pre-drilling. The highest values were identified in the radial direction, and the lowest in the axial direction. While conventional screws without pre-drilled holes may be regarded as the most suitable, the selfdrilling screws achieved the lowest values.

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Section: Screw Direct Withdrawal Load Resistancesupporting

confidence: 60%

Impact of Thermal Modification of Spruce Wood on Screw Direct Withdrawal Load Resistance

Gašparík¹,

Barcík²,

Borůvka³

et al. 2015

BioResources

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“…Moreover, breaking of hemicelluloses and cellulose chains can significantly reduce wood strength (Poncsák et al 2006). According to Fengel and Wegener (2003), the components of thermally modified wood are stable up to 100°C.…”

Section: Introductionmentioning

confidence: 99%

Effect of thermal treatments on technological properties of wood from two Eucalyptus species

Cademartori

Missio

Mattos

et al. 2015

An. Acad. Bras. Ciênc.

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The effect of thermal treatments on physical and mechanical properties of rose gum and Sydney blue gum wood was evaluated. Wood samples were thermally modified in a combination: pre-treatment in an autoclave (127°C -1h) and treatment in an oven (180-240°C -4h); and only treatment in an oven at 180-240°C for 4h. Chemical changes in the structure of woods were evaluated through infrared spectroscopy. Evaluation of physical properties was performed through mass loss, specific gravity, equilibrium moisture content and dimensional stability tests. Surface changes were analyzed through apparent contact angle technique and static bending tests were carried out to evaluate the mechanical behavior. Use of pre-treatment in autoclave affected the properties analyzed, however oven, resulted in the highest changes on wood from both species. Chemical changes were related to the degradation of hemicelluloses. Moreover, a significant decrease of hygroscopicity and mechanical strength of thermally modified woods was observed, while specific gravity did not significantly change for either of the species studied. The best results of decrease of wettability were found in low temperatures, while dimensional stability increased as a function of temperature of exposure in oven. The highest loss of mechanical strength was observed at 240°C for both species.

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“…Similar results were also found in previous studies (Yildiz, 2002;Ozcifci et al 2009;Malek et al 2013). The weight loss of the heat-treated wood samples is due to the degradation of the wood polymers depending on the heat treatment temperature and treatment time, the hemicelluloses generally being the most thermally-sensitive wood components (Poncsák et al 2006;Yildiz et al 2006).…”

Section: Rezultati I Raspravamentioning

confidence: 99%

“…The degradation of the hemicelluloses starts to take place at a relatively low temperature (between 160 and 260 ºC). Also, the degradation of the hemicelluloses increases with heat treatment temperature and treatment time (Poncsák et al 2006, Yildiz et al 2011. The softwoods are more thermally stable than hardwoods, which is the result of their hemicellulose content and compositional differences (Fengel and Wegener, 1989).…”

Section: Radial* Radijalnimentioning

confidence: 99%

“…The number of screws, pilot-hole diameters, screw depth and material cross-sections should be taken into consideration in wood or wooden material applications (Faherty and Williamson, 1998; Koch, 1972). Poncsák et al (2006), investigated the effect of high heat treatment temperature on screw withdrawal resistance of birch (Betula papyrifera). They indicated that some decreases in screw withdrawal resistance were observed as a result of high temperature.…”

Section: Introduction 1 Uvodmentioning

confidence: 99%

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Determination of Screw Withdrawal Resistance of Some Heat-Treated Wood Species

et al. 2017

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Effect of high temperature treatment on the mechanical properties of birch (Betula papyrifera)

Cited by 220 publications

References 10 publications

Impact of Thermal Modification of Spruce Wood on Screw Direct Withdrawal Load Resistance

Impact of Thermal Modification of Spruce Wood on Screw Direct Withdrawal Load Resistance

Effect of thermal treatments on technological properties of wood from two Eucalyptus species

Determination of Screw Withdrawal Resistance of Some Heat-Treated Wood Species

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