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Adhesive properties of laminated veneer lumber poles for use in temporary soil nailing: development and evaluation of a test method for curved structures in a high-alkaline environment

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Abstract

Innovative circular, hollow, laminated veneer lumber (LVL) beech sections for use as temporary geotechnical soil reinforcement members are currently being developed. Appropriate surface gluing quality between the veneers is fundamental to this subsoil application of the permanently cement-embedded, engineered timber product. The circular cross-section geometry and the permanently high-alkaline environment of the structural member is not covered by presently standardized testing and conditioning methods for examining LVL surface bond line quality. The sample conditioning and tensile shear test method compliant with EN 302-1 (Adhesives for load-bearing timber structures—test methods—part 1: determination of longitudinal tensile shear strength, European Committee for Standardization, Brussels, 2013) was modified to determine bonding parameters for circular, hollow LVL sections. Bond line curvature, groove cutting depth and sample geometry were found to greatly influence stress distribution, percentage of wood failure and tensile shear strength. Short-term alkaline treatment of test samples did not significantly influence the bonding performance, wood failure percentage, tensile shear strength and fracture patterns. To improve tensile shear strength, adhesives with different material rigidities were used and compared. An orthotropic, elastic numerical analysis revealed a greater influence of adherent elasticity than adhesive elasticity on the stress distribution within the bond line. With regard to determining the bond line integrity of curved veneer poles, a sample geometry compliant with EN 302-1 (2013) was developed and numerically evaluated.

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Acknowledgements

The authors would like to thank Mr. Alexander Englberger for his great efforts carrying out the tests and Dr. Christian Lehringer (Purbond AG) and Mr. Sebastian Meyer (Türmerleim) for providing adhesive and insights. The research was supported by the German Federal Ministry of Education and Research.

Funding

Funding was provided by Bundesministerium für Bildung und Forschung (13FH022IX4).

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Authors and Affiliations

  1. Department of Research and Development, University of Applied Sciences Rosenheim, Rosenheim, Germany

    Sebastian Hirschmüller

  2. Faculty of Wood Technology, University of Applied Sciences Rosenheim, Rosenheim, Germany

    Johann Pravida

  3. Institute of Soil Mechanics and Foundation Engineering, Graz University of Technology, Graz, Austria

    Roman Marte

  4. Institute of Construction and Material Sciences, University of Innsbruck, Innsbruck, Austria

    Michael Flach

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  1. Sebastian Hirschmüller
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Correspondence to Sebastian Hirschmüller.

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Hirschmüller, S., Pravida, J., Marte, R. et al. Adhesive properties of laminated veneer lumber poles for use in temporary soil nailing: development and evaluation of a test method for curved structures in a high-alkaline environment. Wood Sci Technol 52, 1061–1092 (2018). https://doi.org/10.1007/s00226-018-0997-y

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