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Production of glued laminated timber with copper azole treated maritime pine

Herstellung von Brettschichtholz aus mit Kupferazol behandelter Strandkiefer

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Abstract

A study was conducted to evaluate the performance of glued laminated timber (glulam) of maritime pine treated with a copper azole preservative product. Shear strength of glue lines met the requirements of EN 386 (2001) with no influence of clamping pressure and cure temperature. According to the same standard, delamination was satisfactory for higher cure temperatures applied with a clamping pressure of 0.6 N/mm2. Finger joints made with treated wood gave satisfactory bending strength. The preservative treatment did not influence the modulus of elasticity of the beams. According to a Monte Carlo simulation and following the requirements of EN 1194 (2002), glulam of class GL 28c can be manufactured if visually graded maritime pine of classes E and EE (NP 4305 1995) is used in the inner and outer lamellas, respectively, and class GL 24h when using both grades in equal proportions randomly distributed through the glulam element.

Zusammenfassung

In dieser Studie wurden die Eigenschaften von Brettschichtholz (Glulam) aus Strandkiefernholz, das mit Kupferazol-Schutzmittel behandelt wurde, untersucht. Die Scherfestigkeit der Klebstofffugen erfüllte die Anforderungen der EN 386 (2001). Dabei hatten der Pressdruck und die Aushärtungstemperatur keinen Einfluss. Bei höheren Aushärtungstemperaturen und einem Spanndruck von 0,6 N/mm2 ergaben sich bezüglich den Anforderungen der EN 386 zufrieden stellende Delaminierungsergebnisse. Die Biegefestigkeit der Keilzinkenverbindungen aus behandeltem Holz war ebenfalls zufrieden stellend. Die Schutzmittelbehandlung hatte keinen Einfluss auf den E-Modul der Träger. Eine Monte-Carlo-Simulation ergab, dass auf Basis der EN 1194 (2002) Brettschichtholz der Klasse GL 28c hergestellt werden kann, wenn für die inneren bzw. äußeren Lamellen visuell sortiertes Strandkiefernholz der Klassen E bzw. EE (NP 4305:1995) verwendet wird, oder dass Klasse GL24h hergestellt werden kann, wenn beide Klassen zu gleichen Anteilen zufällig im Querschnitt verteilt verwendet werden.

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Acknowledgements

The authors wish to thank Fundação para a Ciência e a Tecnologia (Portuguese Foundation for Science and Technology), for the PhD grant (number SFRH/BD/30310/2006) given to Florindo Gaspar, and to Arch Timber Protection Ltd for the support.

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Authors and Affiliations

  1. Polytechnic Institute of Leiria, School of Technology and Management, Morro do Lena, Alto do Vieiro, 2411-901, Leiria, Portugal

    Florindo Gaspar

  2. Structures Department, LNEC, Av. do Brasil, 101, 1700-066, Lisboa, Portugal

    Helena Cruz & Lina Nunes

  3. Department of Civil Engineering, Technical University of Lisbon, IST, Av. Rovisco Pais, 1049-001, Lisboa, Portugal

    Augusto Gomes

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  1. Florindo Gaspar
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  2. Helena Cruz
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  3. Augusto Gomes
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  4. Lina Nunes
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Correspondence to Florindo Gaspar.

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Gaspar, F., Cruz, H., Gomes, A. et al. Production of glued laminated timber with copper azole treated maritime pine. Eur. J. Wood Prod. 68, 207–218 (2010). https://doi.org/10.1007/s00107-009-0373-6

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  • DOI: https://doi.org/10.1007/s00107-009-0373-6

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