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

Abstract

Carbon fiber fabric reinforced laminated veneer lumber (RLVL) pieces were prepared by using heat-treated beech (Fagus orientalis Lipsky) veneers with polyurethane (PU) adhesive as the binder. Carbon fiber fabric was tested in three different locations with solid material and non-reinforced samples (on the bottom adhesive line, upper adhesive line, and upper and bottom adhesive lines-symmetrical). Prior to the manufacture of LVL and RLVL, heat treatment was conducted in a laboratory oven at three temperatures. These temperatures were 150, 170, and 190 °C. Tests were performed on LVL and RLVL to determine their air-dried density, modulus of rupture (MOR), and modulus of elasticity in bending (MOE). Experimental test results showed that reinforcement with carbon fiber increased the air-dried density, MOR, and MOE. In addition, carbon fiber fabric placed symmetrically close to bottom and upper surfaces gave the highest MOR and MOE values. However, locating the carbon fiber fabric closer to the bottom surface tended to give higher mechanical properties for the reinforced LVL.

Numerical, Theoretical, and Experimental Analysis of LVL-CFRP Sandwich Structure

“…Sokolovic et al [ 16 ] analyzed the possibility of improving the mechanical properties of layered glued veneer modified with carbon fiber-reinforced fabrics during production, achieving a significant increase in the system’s load-bearing capacity and stiffness. Similar considerations were conducted by Percin and Uzun [ 17 ], who investigated various configurations of placing carbon fabric on the rupture modulus and elasticity modulus of small veneer samples made of thermally treated beech. Núñez-Decap et al [ 18 ] verified the possibility of applying sheets made of basalt and carbon fibers to improve the physical and mechanical properties of layered glued veneers during production, resulting in increased bending and tensile strength.…”