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GFRP-To-Timber Bonded Joints: Adhesive Selection

Miao, C., Fernando, D., Heitzmann, M. T. and Bailleres, H. GFRP-To-Timber Bonded Joints: Adhesive Selection. International Journal of Adhesion and Adhesives . ISSN 0143-7496

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Article Link(s): https://doi.org/10.1016/j.ijadhadh.2019.05.007

Publisher URL: http://www.sciencedirect.com/science/article/pii/S0143749619301137

Abstract

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.

Item Type:Article
Business groups:Horticulture and Forestry Science
Keywords:GFRP timber single strap joint curing temperature moisture cycle tests
Subjects:Forestry > Research. Experimentation
Forestry > Forestry machinery and engineering
Forestry > Tools and implements
Forestry > Exploitation and utilization
Deposited On:27 May 2019 01:58
Last Modified:27 May 2019 01:58

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