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Effect of Low Temperatures on the Block Shear Strength of Norway Spruce Glulam Joints
Luleå University of Technology.
Luleå University of Technology.
Luleå University of Technology.
Linnaeus University, Faculty of Technology, Department of Forestry and Wood Technology.
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2016 (English)In: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, Vol. 11, no 4, 9638-9648 p.Article in journal (Refereed) Published
Abstract [en]

The block shear strength of Norway spruce (Picea abies (L.) Karst.) glulam joints was tested under low temperature. Glulam samples were glued with the three of the most common outdoor structural adhesives. The cold temperatures tested were 20, −20, −30, −40, -50 and −60 °C. Within the temperature test range, the block shear strength of the glulam joints was resistant to the effect of temperature. As the temperature decreased, the joints’ block shear strength did not show any significant change. In most cases, phenol-resorcinol-formaldehyde (PRF) adhesive yielded the strongest block shear strength, while melamine-formaldehyde (MF) adhesive yielded the weakest block shear strength. Melamine-urea-formaldehyde (MUF) adhesive yielded similar results to those of MF adhesives for all temperatures tested. The block shear strengths of the glulam joints with PRF, MUF and MF adhesives were not sensitive to temperature change. The results indicated that PRF, MUF and MF adhesives are stable for outdoor structural engineered wood construction in cold climate. The results also suggest that the SS-EN 14080 (2013) standard for the block shear method may not be the proper standard for testing differences in shear strength at different temperatures. The EN 302-1 (2011) standard could be more suitable for this purpose.

Place, publisher, year, edition, pages
USA: North Carolina State University, Department of Wood & Paper Science , 2016. Vol. 11, no 4, 9638-9648 p.
Keyword [en]
Block shear strength, Norway spruce, Outdoor structural adhesives, Glulam joints
National Category
Wood Science
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
URN: urn:nbn:se:lnu:diva-57064OAI: oai:DiVA.org:lnu-57064DiVA: diva2:1020523
Available from: 2016-10-04 Created: 2016-10-04 Last updated: 2016-11-22Bibliographically approved

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Ahmed, Sheikh Ali
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Department of Forestry and Wood Technology
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