Yazar "Altunok, Mustafa" seçeneğine göre listele

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    Determination of Screw Withdrawal Resistance of Some Heat-Treated Wood Species
    (Zagreb Univ, Fac Forestry, 2017) Percin, Osman; Yasar, Sekip Sadiye; Altunok, Mustafa; Uzun, Oguzhan
    In this study, the screw withdrawal resistance of heat-treated hornbeam (Carpinus betulus L.), black pine (Pinus nigra Arnold) and Uludag fir (Abies bornmuellerinana Mattf.) was determined according to the ASTM D 1761 standard. For this purpose, wood materials were heat treated at 150, 170, 190 and 210 degrees C for 3 h. After the heat treatment, the screw withdrawal resistance of the wood was determined in radial, tangential and transverse directions. As a result, the screw withdrawal resistance values decreased with increasing heat treatment temperature and the lowest resistance was obtained in the wood heat-treated at 210 degrees C. In terms of wood species, the highest screw withdrawal resistance was found in hornbeam (Carpinus betulus L.), while the lowest value was observed in black pine (Pinus nigra Arnold). Additionally, in terms of the cross-sectional direction, the highest screw withdrawal resistance was determined in the tangential direction, while the lowest resistance value was observed in the transverse direction.
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    Impact Of Heat Treatment On Weight Loss During Combustion Of Laminated Veneer Lumber (LVL)
    (Gazi Univ, 2019) Percin, Osman; Altunok, Mustafa
    This study was performed to determine the effects of heat treatment on weight loss during combustion of the laminated wood materials produced from Oriental beech (Fagus orientalis L.), scotch pine (Pinus sylvestris L.), sessile oak (Quercus petraea L.), and poplar (Populus nigra L.) veneers bonded with PVAc-D-4, PUR and MF adhesives. For this aim, the weight loss during combustion of the test samples was determined according to ASTM E 160-50. The results of this study indicated that the weight loss percentage was the highest in poplar wood (89.17%), PVAc-D-4 adhesive (89.79%) and control samples (88.69%). In the interaction of the wood materials and type of adhesive, the highest value was measured in poplar+PUR (90.93%), interaction of the wood materials and heat treatment in poplar + control samples (90.87%), in the interaction of the type of adhesive and heat treatment in PVAc-D-4 + 185 degrees C (91.10%). In the interaction of the wood material, type of adhesive and heat treatment temperature, the highest value was determined in laminated control poplar samples with PUR adhesive (93%), while the lowest in laminated scotch pine samples with MF and heat-treated at 185 degrees C (81.83%). The use of laminated and heat-treated wood material in places where in high risk of fire, impregnation of wood material with fire-retardant compounds can be suggested.
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    Some physical and mechanical properties of laminated veneer lumber reinforced with carbon fiber using heat-treated beech veneer
    (Springer, 2017) Percin, Osman; Altunok, Mustafa
    Heat treatment at relatively high temperatures (from 150 to 260 A degrees C) is an effective way to improve dimensional stability and bio durability. However, heat treatments usually reduce most of the mechanical properties of wood. This study was performed to investigate the effect of carbon fiber fabric on some mechanical and physical properties of LVL manufactured from heat-treated and untreated beech (Fagus orientalis Lipsky) wood. The laminated veneer lumber (LVL) and reinforced laminated veneer lumber (RLVL) samples were produced from heat-treated and untreated beech veneers in the five ply form (4 mm each) by using D-VTKA adhesive. Prior to the manufacture of LVL and RLVL, veneers were subjected to heat treatment at varying temperatures (160, 190 and 220 A degrees C) for 180 min. Carbon fiber revealed a clear effect on the mechanical (bending strength, modulus of elasticity in bending, compression strength) and physical properties (density, equilibrium moisture content, and volumetric swelling) of heat-treated and control LVL. The results showed that reinforcement with carbon fiber increased the density, the bending strength and modulus of elasticity in bending and the compression strength. Also, the volumetric swelling of reinforced laminated veneer lumber was more favorable than those of laminated veneer lumber.