GFRP-to-timber bonded joints: Adhesive selection

Chuang Miao, Dilum Fernando*, Michael T. Heitzmann, Henri Bailleres

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

Recent research at the University of Queensland (UQ) has led to the development of a new type of structures called “Hybrid Fiber Reinforced Polymer (FRP)-Timber structures” (“HFT”). In HFT structures, FRP is combined with timber veneers to create high-performance, lightweight, easy-to-construct structural members. These HFT members take advantage (i) of the orthotropic properties of both, timber and FRP to orientate the fiber direction to produce optimal composite properties, and (ii) of the geometry of the cross sections to maximize the load bearing capacity for a given amount of material. While preliminary experimental work has revealed as such the effectiveness of HFT structural members, no work has been carried out so far to investigate the behavior of these HFT structures. Performance of these new HFT members relies significantly on the bond between FRP and timber. This paper presents the results of an experimental study aimed at selecting a suitable commercially available adhesive for glass fiber reinforced polymer (GFRP)-to-timber bonded joints. The experimental program included 393 single lap joint tests covering four different commercially available adhesives, two different curing temperatures, and two test methods (dry and moisture cycle tests). The test results revealed that both, polyurethane (PUR) and cross-linking polyvinyl acetate emulsion (PVAx) performed as the best under dry conditions, while PUR was shown to be superior to all other adhesives when subjected to moisture cycles. Epoxy and phenol resorcinol formaldehyde adhesive (PRF) commonly used in FRP structures and laminated timber structures, resp., were found to be less performing structural adhesives for HFT structures.

Original languageEnglish
Pages (from-to)29-39
Number of pages11
JournalInternational journal of adhesion and adhesives
Volume94
Early online date22 May 2019
DOIs
Publication statusPublished - Oct 2019

Keywords / Materials (for Non-textual outputs)

  • Curing temperature
  • GFRP
  • Moisture cycle tests
  • Single strap joint
  • Timber

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