A review of factors influencing the durability of structural bonded timber joints

Custódio, João; Broughton, James; Cruz, Helena

doi:10.1016/j.ijadhadh.2008.03.002

Cited by 158 publications

(87 citation statements)

References 24 publications

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“…woodworking, furniture components, and others) (Pizzi and Mittal 2003). Generally, bonded joints may provide a given material with better mechanical properties, such as greater joint strength over the strength limit of the actual bonded material, low weight in view of the structure of the created composite, the possibility to increase the resistance of the joint against the effects of biotic and abiotic agents (Richardson 1987), the possibility of simple joining of several dissimilar materials, and possible reduction of production costs (Custódio et al 2009). …”

Section: Introductionmentioning

confidence: 99%

Influence of Moisture Content on the Bond Strength and Water Resistance of Bonded Wood Joints

et al. 2014

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Bonding processes play a significant role in the wood and furniture industry. They allow for the creation of fixed joining of construction elements, creation of new materials and, last but not least, aesthetic appreciation of parts. However, the quality of bonded joints is affected by many factors, one of which is the moisture of the bonded materialwood. The main objective of this research was to determine the influence of wood moisture on the strength of bonded joints formed by polyvinyl acetate (PVAc) and polyurethane (PUR) adhesives. In current practice these adhesives are being increasingly used for their properties and zero formaldehyde content. The procedure for determining the bond strength (tensile shear strength of lap joints) corresponded to standard EN 205. It was ascertained that in addition to actual moisture of bonded wood, the quality of the joint is also affected by the environment to which the glued joint is subsequently subjected. In a normal environment, the strength of the tested joint PVAc adhesive decreases with increasing wood moisture, but it still meets the requirement of the standard. In a humid environment, the strength falls below the limit of the standardized value. In a normal environment the joint strength bonded with PUR adhesive is similar, but the decrease in strength is lower. In a humid environment it shows the highest strength at 20% wood moisture and meets the specified standard minimum strength (4 MPa). Graphs were created from the measured values that clearly show the influence of wood moisture on the final bond strength of a joint.

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Section: Introductionmentioning

confidence: 99%

Influence of Moisture Content on the Bond Strength and Water Resistance of Bonded Wood Joints

et al. 2014

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“…When the homogeneity groups were examined in terms of the adhesive types, the highest bonding strength was obtained in the polyurethane adhesive, whereas the lowest bonding strength was obtained in the polyvinyl acetate adhesive. As Custódio et al (2009) has reported; true chemical bonds are the strongest links that can be obtained when a chemical reaction occurs between the cellulose and the adhesive molecules one of them is polyurethane.…”

Section: Bonding Strengthmentioning

confidence: 91%

Determination of the Modulus of Elasticity of Wooden Construction Elements Reinforced with Fiberglass Wire Mesh and Aluminum Wire Mesh

et al. 2017

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Laminated composite wooden construction elements were produced with 7 layers of Scots pine (Pinus sylvestris L.). Fiberglass wire mesh and aluminum wire mesh, which were used as reinforcement materials, were pressed with polyvinyl acetate (PVAc) and polyurethane-type adhesives between each Scots pine layer. The highest bonding strength values were obtained from laminated control specimens produced with polyurethane adhesive without using support materials (4.98 N/mm 2 ) and laminated control specimens made with polyurethane adhesive without using support materials (4.39 N/mm 2 ), respectively. The modulus of elasticity in bending perpendicular to the glue line values of all the specimens except the laminated control specimens produced with polyurethane adhesive without using support materials (14800 N/mm 2 ) were lower than solid wood (6720 N/mm 2 ). In contrast, in the experiments for the modulus of elasticity parallel to the glue line, the variables (adhesive, intermediary layer materials) used for all experiments and specimens were effective factors. Although the modulus of elasticity in bending parallel to the glue line values of all samples were higher than solid wood (6720 N/mm 2 ), the maximum value was obtained in the laminated control specimens produced with polyurethane adhesive without using support materials (17800 N/mm 2 ).

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“…Custódio et al [3] undertook a comprehensive review of factors that influence the durability of structurally bonded timber joints. Raftery et al [4,5] concluded from experimental testing that not only did the quality of the bond depend on the adhesive under examination but it also depended on the FRP type that was being bonded.…”

Section: Adhesively Bonded-in Reinforcementmentioning

confidence: 99%

Repair of glulam beams using GFRP rods

Raftery

Harte

2009

WIT Transactions on the Built Environment

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Timber is one of the oldest building materials and is very attractive because it is a renewable resource, recyclable and relatively inexpensive. However, as the service requirements that are imposed on structural members change, mechanical upgrade or repair becomes of increasing importance. This paper describes an experimental test programme which investigates the use of glass fibre reinforced polymer rods (GFRP) for the retrofit of low-grade glue-laminated timber beams, which were tested in bending initially in the unreinforced state for both stiffness and ultimate moment capacity. The test results demonstrated that by correctly carrying out the retrofitting procedure in timber beams that were severely damaged, mechanical strength and flexural stiffness of the original beams could be regained and in addition significant ductility was introduced.

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A review of factors influencing the durability of structural bonded timber joints

Cited by 158 publications

References 24 publications

Influence of Moisture Content on the Bond Strength and Water Resistance of Bonded Wood Joints

Influence of Moisture Content on the Bond Strength and Water Resistance of Bonded Wood Joints

Determination of the Modulus of Elasticity of Wooden Construction Elements Reinforced with Fiberglass Wire Mesh and Aluminum Wire Mesh

Repair of glulam beams using GFRP rods

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