Screw withdrawal strength of heat-treated and laminated veneer lumber reinforced with carbon and glass fibers

Abstract

The strength of a structural system often depends on the interconnections between the components of the structure. Screws are one of the most widely used fasteners in construction. In this study, the screw withdrawal strength of heat-treated scotch pine (Pinus sylvestris L.) samples reinforced with glass and carbon fibers via Desmodur-vinyl trie ketonol acetate adhesive was investigated. Before manufacturing the laminated veneer lumber, the wood samples were subjected to heat treatment at a temperature of 150 °C, 170 °C, 190 °C, and 210 °C for 2 h. Test results showed that the reinforcement fiber type and heat treatment temperatures had a considerable effect on the screw withdrawal strength. Heat treatment reduced the screw withdrawal strength, while the samples reinforced with both fibers had higher screw withdrawal strengths than those without reinforcement. Reinforcement with glass and carbon fibers increased the screw withdrawal strength up to 38% and 49% in the tangential, 13% and 20% in the radial, and 17% and 25% in the axial direction, respectively, compared to solid wood. In addition, the laminated veneer lumber samples reinforced with carbon fiber had a considerable increase in the screw withdrawal strength compared with the solid wood and glass fiber reinforced samples.

Prediction of screw withdrawal resistance for plywood laminated panels and sandwich panels

“…In addition, an increase in pilot hole diameter adversely affected the SWS of the materials. Perçin and Uzun (2022) examined the effect of heat treatment on the SWR of laminated veneer lumber (LVL) reinforced with carbon fiber, and glass fiber. It was stated that an increase in temperature in heat treatment decreased the SWR of the LVL.…”

Properties of heat-treated beech laminated veneer lumber reinforced with carbon fiber fabric

“…Due to this, they are widely used in different applications that require resistance to fatigue, bearing capacity of beams, and heat and sound insulation (Auriga et al 2020). In recent years, carbon fiber fabrics have been commonly used for reinforcing LVL composite materials (Wei et al 2013;Wang et al 2015;Rescalvo et al 2020;Perçin and Uzun 2022). A previous study by Rescalvo et al (2022) tested some mechanical properties of poplar LVL reinforced with fiber-reinforced polymer (FRP).…”

Physical and mechanical properties of laminated wood made from heat-treated Scotch pine reinforced with carbon fiber

“…Wood-based composites reinforced by carbon fibers are being used extensively for many structural applications. In recent years, carbon fiber fabrics have been widely used for reinforcing LVL materials (Fiorelli and Dias 2003;Perçin and Altunok 2017;Rescalvo et al 2020;Perçin and Uzun 2022). Reinforcing fiber technology is an effective and applicable method for improving the strength properties of LVL produced from low-quality wood materials.…”