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Determination of the bond strength of treated wood strands embedded in a  cement matrix by means of a  pull-out test

Bestimmung der Bindefestigkeit von behandelten Holzspänen und Zement mittels Auszugstest

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Abstract

Effects of chemical treatment of wood on the bonding strength of Norway spruce strands (Picea abies Karst.) embedded in a  cement matrix were investigated by means of a  pull-out test. Strands of varying thickness were used whereas a  strong influence of thickness on bonding strength could be observed. Using thick strands (800 μm) showed negative effect on bonding strength which is due to the swelling effect. The treatment of thin strands (400 μm) showed that using wet strands (∼ 90% moisture content) leads to the best results compared to untreated dry (12%) strands. By addition of setting accelerators (ammonium chloride) bonding strength of wet strands was even improved. Furthermore, effects of hot water and sodium hydroxide extraction as well as sodium silicate treatment were examined.

Zusammenfassung

Zur Bestimmung der Bindefestigkeit zwischen Holz und Zement wurden anhand von unterschiedlich behandelten Strands aus Fichtenholz (Picea abies Karst.) Auszugstests durchgeführt. Strands mit unterschiedlicher Dicke wurden in die Zementmatrix eingebettet, wobei ein starker Einfluss der Stranddicke auf die Bindefestigkeit nachgewiesen werden konnte. Die Verwendung dicker Strands (800 μm) zeigte einen negativen Einfluss auf die Bindefestigkeit, welcher auf Quellungseffekte zurückzuführen ist. Die Behandlung dünner Strands (400 μm) ergab, dass die Verwendung feuchter Strands (u ∼ 90%) zu den besten Ergebnissen führte. Bei einer zusätzlichen Verwendung eines Erstarrungsbeschleunigers (Ammoniumchlorid) konnte die Bindefestigkeit weiter verbessert werden. Ferner wurden die Effekte von Heißwasser- und Natronlaugeextraktion sowie die Behandlung mit Natronwasserglas untersucht.

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Authors and Affiliations

  1. Wood K plus – Competence Centre for Wood Composites and Wood Chemistry, Linz Austria, Peter-Jordan-Strasse 82, 1190, Vienna, Austria

    Stephan Frybort & Ulrich Müller

  2. Doka Industrie GmbH, Reichsstraße 23, 3300, Amstetten, Austria

    Raimund Mauritz

  3. Department of Material Sciences and Process Engineering, BOKU-Vienna, Peter-Jordan-Strasse 82, 1190, Vienna, Austria

    Alfred Teischinger

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  1. Stephan Frybort
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  2. Raimund Mauritz
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  3. Alfred Teischinger
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  4. Ulrich Müller
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Correspondence to Stephan Frybort.

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Frybort, S., Mauritz, R., Teischinger, A. et al. Determination of the bond strength of treated wood strands embedded in a  cement matrix by means of a  pull-out test. Eur. J. Wood Prod. 68, 407–414 (2010). https://doi.org/10.1007/s00107-009-0383-4

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  • DOI: https://doi.org/10.1007/s00107-009-0383-4

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