Properties of hybrid glued-laminated timber manufactured from peeler cores

Abstract

ABSTRACT The aim of the present study was to determine some basic physical and mechanical properties of a hybrid glued-laminated timber manufactured from peeler cores (GLPC) as by-products of plywood manufacturing, ensuring more complete and efficient utilisation of wood raw materials in high value-added applications. The GLPCs were manufactured from beech and poplar wood at different ratios by using several combinations of lamellae with trapezoidal cross-sections. The highest density ρmax of 572 kg.m−3 (ρmean = 544 ± 12.9 kg.m−3) was determined for the beams manufactured at beech:poplar ratio of 1:1. The modulus of rupture (MOR) and modulus of elasticity (MOE) were 71 ± 9.4 N.mm−2 and 12,809 ± 1211.7 N.mm−2, respectively. The highest shear strength were obtained for the beams manufactured by gluing beech to beech: f v , g , k ( 60 ) = 17 ± 3.8 N.mm−2. The greatest values when testing the compressive strength and tensile strength of the GLPC were found for combination beech 50%/ poplar 50%: f c , g , k ( 90 ) = 60 ± 8.6 N.mm−2 and f t ( 0 ) , g , k = 42 ± 8.0 N.mm−2. All types of beams produced in laboratory conditions met the minimum requirements of the GL 32c and GL 32 h classes.