sažetak izlaganja sa skupa
Using natural fibre as reinforcements may significantly improve the mechanical properties of wood-based building elements. A study of the effect of reinforcements made of carbon fibre-reinforced polymer (CFRP) and glass fibre-reinforced polymer (GFRP), glued with two different commercial adhesives, to oak-wood model beams laminated in two directions, was performed to improve stiffness in the elastic region and bending strength. Fibres were introduced in the model beams' tensile and compression zones, glued with epoxy resin and polyurethane adhesives. As oak wood is more challenging for gluing than softwoods, which are dominantly used for laminations, the suitability of different types of adhesives was analysed. Carbon and glass fibres producers recommend the usage of epoxy in combination with wood. Conversely, PUR adhesives have been most commonly used for glulam for nearly two decades. They have been standardized (according to EN 15425 and related standards), but their ability to be combined with GFRP or CFRP is still not fully proven. CFRP and GFRP were glued into the laminated beams with epoxy resin (ER) and polyurethane adhesives (PUR) and subjected to testing. Displacements and deformations were tested in elastic region using DIC method and four-point bending with aim to select the optimum combination of reinforcement and adhesive. The average load in elastic region for the samples glued with PUR adhesives are comparable to those glued with epoxy resin (up to 5 % lower). On the other hand, implants glued with PUR adhesives exhibit a displacement reduction of up to 5%. Slightly lower mechanical properties of the beams laminated with polyurethane (PUR) adhesive, on one side, and very challenging utilization of epoxy adhesive in industrial conditions on the other side set PUR as an adequate alternative for bonding wood to CFRP and GFRP reinforcements.
Laminated timber, oak–wood, four-point bending, reinforced polymer, DIC
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