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European Journal of Wood and Wood Products

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01-05-2014 | Originals Originalarbeiten

Structural bonding of ash (Fraxinus excelsior L.): resistance to delamination and performance in shearing tests

Authors: Markus Knorz, Michael Schmidt, Stefan Torno, Jan-Willem van de Kuilen

Published in: European Journal of Wood and Wood Products | Issue 3/2014

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Abstract

The utilization of ash (Fraxinus excelsior L.) allows for a significant enhancement of the load-bearing capacity in structural laminated products. However, such applications fundamentally require high-strength and durable bonds between lamellas and in finger joints. Therefore, the aim of the present survey was to evaluate ash bondings in terms of resistance to delamination (EN 302-2) and shear performance (EN 392). Investigations were performed with five adhesives: phenol-resorcinol-formaldehyde (PRF), melamine-urea-formaldehyde (MUF-1, MUF-2), polyurethane (PUR), emulsion polymer isocyanate (EPI) and varying closed assembly times as key bonding parameter. For all tested adhesives and closed assembly times, the shear test showed high wood failure percentages and bond strength values that compare to solid ash. In contrast, for resistance to delamination, significant differences were found between the adhesives as well as between closed assembly times, with improving resistance to delamination for increasing closed assembly times. The best performance was determined for the PRF-adhesive and long closed assembly times. However, standard requirements for resistance to delamination could not be met by any of the adhesives. The resistance to delamination showed no correlation with the shear performance for any of the adhesives. Microscopic examination of the bonded joints revealed that both the penetration behavior of the adhesives and glueline thicknesses clearly correlated with the closed assembly time.

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Title: Structural bonding of ash (Fraxinus excelsior L.): resistance to delamination and performance in shearing tests
Authors: Markus Knorz
Michael Schmidt
Stefan Torno
Jan-Willem van de Kuilen
Publication date: 01-05-2014
Publisher: Springer Berlin Heidelberg
Published in: European Journal of Wood and Wood Products / Issue 3/2014
Print ISSN: 0018-3768
Electronic ISSN: 1436-736X
DOI: https://doi.org/10.1007/s00107-014-0778-8

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