Adhesive joints in glass structures: effects of various materials in the connection,thickness of the adhesive layer,and ageing |
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| Affiliation: | 1. Klokner Institute, Czech Technical University in Prague, ?olínova 7, 16608 Prague, Czech Republic;2. Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, 16629 Prague, Czech Republic;1. Eckersley O’Callaghan (EOC), London, United Kingdom;2. Steel Structures Laboratory (ICOM), School of Architecture, Civil and Environmental Engineering (ENAC), École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland;3. Department of Architectural Engineering and Technology (AE+T), Faculty of Architecture and the Built Environment (A+BE), Delft University of Technology (TU Delft), Delft, The Netherlands;1. CTU Prague, Department of Steel and Timber Structures, Thákurova 7, 166 29 Prague 6, Czech Republic;2. University of Trieste, Department of Engineering and Architecture, Piazzale Europa 1, 34127 Trieste, Italy;1. Department of Structural Engineering, Faculty of Civil Engineering, Silesian University of Technology, Gliwice, Poland;2. Division of Structural Mechanics, Faculty of Engineering, Lund University, Lund, Sweden;1. Dipartimento di Ingegneria Civile, Edile e Architettura (DICEA), Università Politecnica delle Marche, Via Brecce Bianche, 60131 Ancona, Italy;2. Dipartimento di Ingegneria Industriale e Scienze Matematiche, Università Politecnica delle Marche, Via Brecce Bianche, 60131 Ancona, Italy |
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| Abstract: | This paper reports on an investigation of glued joints in glass load-bearing structures, with reference to the effect of various substrates (glass, steel, stainless steel, aluminium) and their surface treatment (sandblasting for the glass surface) on the adhesion of selected adhesives. The thickness of the adhesive layer and the effect of artificial ageing – a simulation of 5 years of ageing in outdoor central-European conditions – are also discussed. Tensile and shear tests were carried out on three series of specimens with various adhesives and substrates – two series for tensile and shear tests, and one series for shear tests on specimens exposed to ageing. Our results show that sandblasting the glass surface can improve the adhesion, and thus the strength values, of an adhesive joint in cases where, with a smooth glass surface, cohesive failure is not reached. The thickness of the adhesive layer had a significant effect for a semi-rigid acrylate adhesive, where the joint achieved higher strength values with less thickness of the glue. The effect of ageing varied according to the adhesive. The most visible changes were observed for a two-component acrylate adhesive and for methacrylate UV-adhesives. One of the selected glues was marked as unsuitable for load-bearing connections due to significant worsening of its mechanical properties after ageing. |
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| Keywords: | Glass Metal Mechanical properties of adhesives Ageing Thickness of glue |
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