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Adhesively bonded joints between spruce glulam and birch plywood for structural applications: experimental studies by using different adhesives and pressing methods
KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
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2023 (English)In: Wood Material Science & Engineering, ISSN 1748-0272, E-ISSN 1748-0280, Vol. 18, no 3, p. 1141-Article in journal (Refereed) Published
Abstract [en]

Due to the increasing interest in reducing the usage of metals in the construction sector, birch plywood has shown good potential in structural engineering and timber connections as a substitute for the more conventional slotted-in metal plate solutions. However, a proper way of bonding birch plywood with other timber parts that results in adequate connection strength has not been fully investigated. In this paper, experimental studies were carried out to investigate the proper workflow when manufacturing bonded connections made of birch plywood and spruce glulam beams. Tensile shear mechanical tests were then conducted on produced bonded joints to evaluate the bond strength. Three adhesives, i.e. melamine-urea-formaldehyde (MUF), phenol–resorcinol–formaldehyde (PRF), and two-component polyurethane (2C PUR) were evaluated in dry and moist conditions. The influence of three pressing methods, i.e. (a) screw-gluing, (b) clamping by means of clamps, and (c) clamping by application of weight loads, on the bonding strength was investigated. The bonding strength was thereafter compared with the shear strength of spruce glulam and the wood failure percentage was also examined in this study. © 2023 The Author(s). 

Place, publisher, year, edition, pages
Taylor and Francis Ltd. , 2023. Vol. 18, no 3, p. 1141-
Keywords [en]
Birch plywood, bonding strength, tensile shear tests, wood failure percentage, Adhesive joints, Adhesives, Construction industry, Diffusion bonding, Formaldehyde, Phenols, Plate metal, Tensile strength, Tensile testing, Urea, Urea formaldehyde resins, Adhesively bonded joints, Construction sectors, Pressing methods, Structural applications, Tensile shear test, Timber connections, Wood failure, Plywood
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:ri:diva-64394DOI: 10.1080/17480272.2023.2201577Scopus ID: 2-s2.0-85153583741OAI: oai:DiVA.org:ri-64394DiVA, id: diva2:1754430
Note

Funding details: 2017-02712; Funding details: VINNOVA, 2021-03681; Funding details: China Scholarship Council, CSC; Funding text 1: The authors wish to gratefully acknowledge China Scholarship Council, Svenskt Trä, Vinnova project 2017-02712 “Outdoor load-bearing timber structures” within the BioInnovation program and Vinnova project 2021-03681 “Rational building systems for medium to long-span timber structures” within the strategic innovation program for Production2030 for the financial support. Dynea is sincerely acknowledged for supplying the MUF and PRF adhesives. Koskisen is thanked for supplying the birch plywood materials and Moelven is acknowledged for supplying the glulam materials. CBI Betonginstitutet AB is thanked for the sample conditioning in the climate rooms.

Available from: 2023-05-03 Created: 2023-05-03 Last updated: 2025-09-23Bibliographically approved

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Blomqvist, Lars

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