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Characterization of cement-bonded particleboards manufactured with maritime pine, blue gum and cork grown in Portugal

Eigenschaften von Zement gebundenen Spanplatten aus Strandkiefer, Eukalyptus und Kork portugiesischer Herkunft

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Abstract

Wood-cement panels were manufactured using three lignocellulosic materials of Portuguese origin: blue gum (Eucalyptus globulus Labil.), maritime pine (Pinus pinaster Ait.) and cork (the bark of cork oak, Quercus suber L.). Portland cement was used as a binder in the ratio of either 8/1 or 4/1 (cement/lignocellulose on a weight basis). Experimental panels had a target density of 1500 kg/m3. Particles were used either as received or after water washing, or with the addition of CaCl2 as a setting accelerator. The following properties were determined: density, moisture content, thickness swelling, internal bond, modulus of elasticity and modulus of rupture. In general terms, the panels fulfill the requirements of the EN 634-1 and EN 634-2 standards. The only exception was the modulus of rupture which was lower than required. Unlike organic resin bonded panels, adding more binder does not necessarily result in better panels.

Zusammenfassung

Holz-Zement-Platten wurden aus den drei in Portugal beheimateten Baumarten Eukalyptus (Eucalyptus globulus Labil.), Strandkiefer (Pinus pinaster Ait.) und Korkrinde der Korkeiche (Quercus suber L.) hergestellt. Als Bindemittel wurde Portland Zement im Verhältnis 8/1 oder 4/1 (Zement/Lignocellulose in Masseprozent) verwendet. Die Versuchsplatten hatten eine Solldichte von 1500 kg/m3. Die Späne wurden entweder im Anlieferungszustand oder nach Reinigung mit Wasser oder mit Zugabe von CaCl2 als Abbindebeschleuniger verwendet. Es wurden die Dichte, der Feuchtegehalt, die Dickenquellung, die Querzugfestigkeit, der Elastizitätsmodul und die Biegefestigkeit bestimmt. Im Allgemeinen erfüllen die Platten die Anforderungen in EN 634-1 und EN 634-2, mit Ausnahme der Biegefestigkeit, die niedriger als in der Norm gefordert war. Im Gegensatz zu Harz gebundenen Platten führte eine vermehrte Bindemittelzugabe nicht unbedingt zu einer besseren Plattenqualität.

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Acknowledgements

Thanks are due to FCT—Fundação para a Ciência e Tecnologia (Foundation for Science and Technology), Lisbon, Portugal, for the financial support in the frame of the project POCTI/1999/CTM/35480; and to Corticeira Amorim S.A., Instituto Raiz, Jomar—Madeiras e Derivados, S.A and Secil—Companhia Geral de Cal e Cimento S.A., for providing the cork granules, the blue gum chips, the pine particles and the cement, respectively.

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Correspondence to F. Caldeira.

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Pereira, C., Caldeira, F., Ferreira, J.M.F. et al. Characterization of cement-bonded particleboards manufactured with maritime pine, blue gum and cork grown in Portugal. Eur. J. Wood Prod. 70, 107–111 (2012). https://doi.org/10.1007/s00107-011-0532-4

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  • DOI: https://doi.org/10.1007/s00107-011-0532-4

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