Abstract
A feasibility study of glulam was carried out in French Guiana using local wood species. The aim was to determine gluing parameters affording satisfactory behaviour to manufactured glulam in a tropical climate. Three abundant wood species, with special properties, were selected for the study and resorcinol–phenol–formaldehyde resin was used for bonding. Three industrial parameters were considered: adhesive spread rate, closed assembly time and gluing pressure. Delamination and shearing tests were carried out in accordance with European Standards. The tests revealed the influence of wood properties and manufacturing parameters on joint resistance. In fact, the results showed that specific gravity and the shrinkage coefficient greatly influenced the gluing step. Indeed, wood with a medium specific gravity needed more adhesive and more pressure than wood with a high specific gravity. In addition, planing and lamella thickness were found to affect glue joint resistance.
Zusammenfassung
Durchgeführt wurde eine Studie zur Herstellbarkeit von Brettschichtholzträgern unter Verwendung von in Französisch-Guayana vorkommenden Holzarten. Ziel dieser Studie war es, die Parameter der Verklebung zu bestimmen, mit welchen zufriedenstellende Eigenschaften von in einem tropischen Klima hergestelltem Brettschichtholz erzielt werden. Für diese Studie wurden drei weit verbreitete Holzarten mit besonderen Eigenschaften ausgewählt und mit Resorcin-Phenol-Formaldehyd-Harz verklebt. Es wurden die drei in der Praxis wichtigen Parameter Klebstoffauftragsmenge, geschlossene Wartezeit und Pressdruck untersucht. Delaminierungs- und Scherprüfungen wurden gemäß europäischen Normen durchgeführt. Die Prüfungen ergaben, dass die Holzeigenschaften und die Herstellparameter die Klebefestigkeit beeinflussen. Die Ergebnisse zeigten, dass die Rohdichte und das Schwindmaß einen großen Einfluss auf den Verklebungsprozess haben. Holz mit einer mittleren Rohdichte benötigt mehr Klebstoff und einen höheren Pressdruck als Holz mit einer hohen Rohdichte. Des Weiteren hat sich gezeigt, dass Hobeln und die Lamellendicke die Qualität der Klebefuge beeinflussen.
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Bourreau, D., Aimene, Y., Beauchêne, J. et al. Feasibility of glued laminated timber beams with tropical hardwoods. Eur. J. Wood Prod. 71, 653–662 (2013). https://doi.org/10.1007/s00107-013-0721-4
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DOI: https://doi.org/10.1007/s00107-013-0721-4