COMPARISON OF SOME TECHNOLOGICAL PROPERTIES OF (5 LAYERS) WOOD LAMINATIONS CENTERED WİTH POPLAR

This study was conducted to determine some technological properties of the laminated wood materials; beech (Fagus oriantalis Lipsky), oak (Quercus petraea Liebl.), maple (Acer platanoides L.), elm (Ulmus glabra Hud.), walnut (Juglans nigra L.) and ash wood (Fraxinus excelsoir Lipsky), made up with the poplar wood (Populus nigra Lipsky) which was used in the middle layer of the lamination forms. For this aim, the laminated wood materials were prepared in the form of five layers from beech, oak, maple, elm, walnut, ash and poplar woods, glued by Desmodur-VTKA adhesive. Thereafter each sample was tested for observation of density (TS 2472), bending strengths (TS 2474), modulus of elasticity in bending (TS 2478), compression strengths (TS 2595), bursting (ASTM D 143). According to the experimental findings, it has been found that the highest density value in ash-poplar combination (0,552g cm-3) and the lowest in walnut-poplar combination (0,498g cm-3), the highest bending strength in ash-poplar combination (97,77N mm-2) and lowest in walnut-poplar combination (86,63N mm-2), the highest the modulus of elasticity and compression strength on beech-poplar combination; modulus of elasticity 9157,47N mm-2, compression strength (61,64N mm-2) and lowest values on walnut-poplar combination; modulus of elasticity 8281,19 N mm-2, compression strength 50,10N mm-2, the highest bursting strength in beech-poplar combination (0,586N mm-2) and the lowest value in walnut-poplar (0,481N mm-2). Accordingly, the technological properties of walnut-poplar combination were found to be lower than other combinations. As the highest values were observed in beech-poplar and ash-poplar combinations beech-poplar and ash-poplar laminations could be suggested for usage that requires the higher propertie