Abstract
The Influence of hydrothermal treatment on bond shear strength of beech (Fagus orientalis) wood specimens was studied. Wood samples were treated in a reactor at temperatures of 130 and 150 ∘C for a holding time of 30 minutes. For determining the bond shear strength in treated woods, wood blocks were bonded with urea formaldehyde, polyvinyl acetate and epoxy. Shear strength parallel to the grain of wood samples was also measured. Density, shrinkage, pH, contact angle and water absorption of the treated and untreated wood blocks were determined. Results showed a reduction in bond shear strength and shear strength parallel to grain due to hydrothermal treatment. The density, shrinkage and the contact angle of treated wood blocks increased; however the water absorption and the pH were reduced by applying temperature treatment.
Zusammenfassung
Der Einfluss einer hydrothermischen Behandlung auf die Scherfestigkeit einer Buchenholzverklebung (Fagus orientalis) wurde untersucht. Die Holzprüfkörper wurden in einem Behälter bei 130 und 150 ∘C für eine Dauer von 30 Minuten behandelt. Die behandelten Holzprüfkörper wurden mit Harnstoffharz, Polyvinylacetat und Epoxidharz verklebt und anschließend wurde die Scherfestigkeit der Verklebung bestimmt. Auch wurde die Scherfestigkeit des Holzes in Faserrichtung gemessen. Dichte, Schwindverhalten, pH-Wert, Kontaktwinkel und Wasseraufnahme wurden an behandelten und unbehandelten Prüfkörpern bestimmt. Die Ergebnisse zeigten, dass die Scherfestigkeit der Verklebung und die Scherfestigkeit des Holzes in Fasserrichtung aufgrund der hydrothermischen Behandlung abnahmen. Die Dichte, das Schwindverhalten und der Kontaktwinkel der behandelten Prüfkörper nahmen zu, wohingegen die Wasseraufnahme und der pH-Wert durch die Temperaturbehandlung abnahmen.
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Mirzaei, G., Mohebby, B. & Tasooji, M. The effect of hydrothermal treatment on bond shear strength of beech wood. Eur. J. Wood Prod. 70, 705–709 (2012). https://doi.org/10.1007/s00107-012-0608-9
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DOI: https://doi.org/10.1007/s00107-012-0608-9