GFRP-to-timber bonded joints: Adhesive selection |
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| Affiliation: | 1. School of Civil Engineering, University of Queensland, St Lucia QLD, 4072, Australia;2. School of Mechanical and Mining Engineering, University of Queensland, St Lucia QLD, 4072, Australia;3. Department of Agriculture and Fisheries, Salisbury QLD, 4107, Australia;1. Department of Structural Engineering, Faculty of Civil Engineering, Silesian University of Technology, Akademicka 5, 44-100, Gliwice, Poland;2. Institute for Engineering of Polymer Materials and Dyes, Paint and Plastics Department, M. Sk?odowska-Curie 55, 87-100 Toruń, Poland;1. School of Engineering, Deakin University, Waurn Ponds, Victoria 3217, Australia;2. School of Architecture and Built Environment, Deakin University, Geelong, Victoria 3220, Australia;1. Fraunhofer-Institut für Fertigungstechnik und Angewandte Materialforschung IFAM, Wiener Straße 12, 28 359 Bremen, Germany;2. Integrated Wood Design, University of Northern British Columbia, 3333 University Way, Prince George, BC V2N 4Z9, Canada;1. Graduate Student, Department of Civil Engineering, Sharif University of Technology, Tehran, Iran;2. Department of Civil Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran;3. Department of Civil and Environmental Engineering, Faculty of Engineering, University of Auckland, Auckland, New Zealand;1. School of Mechanics and Civil Engineering, China University of Mining and Technology - Beijing, Beijing 100083, China;2. School of Civil, Environmental and Mining Engineering, The University of Adelaide, South Australia 5005, Australia;3. Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University, Shenzhen, 518060, China;4. MOE Key Laboratory of Civil Engineering Safety and Durability of China, Department of Civil Engineering, Tsinghua University, Beijing, 100084, China |
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| 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. |
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| Keywords: | GFRP Timber Single strap joint Curing temperature Moisture cycle tests |
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