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Abstract
In this study; Parallel strand lumber, one of the structural composite lumber products in the engineered wood materials group, has been successfully manufactured. Bamboo (Phyllostachys bambusodies) was used as a wood material in the manufacturing of parallel strand lumber, and polyol was added as a modified material into the glue (pMDI) used in manufacturing. Some physical properties (oven dry density, air dry density, moisture content, thickness swelling and water absorption percentage) and mechanical properties (bending resistance, modulus of elasticity, impact resistance, screw holding capacity in tangential, radial and transverse directions) of parallel strand timbers for both glue tipes were determined .According to the data obtained from the test results; The average air-dry density values of the test samples manufactured with both pMDI and pMDI+5% poliol were found to be 1.02 gr/cm³ and 0.99 gr/cm³ , oven dry density values of 0.99 gr/cm³ and 0.94 gr/cm³ , average moisture content values as 5.13% and 4.92% were determined respectively. While the average radial swelling and tangential swelling values of the test samples 3.78% and 2,49%, respectively, at the end of 2 hours, this rate was 12,41% and 9,66% at the end of 24 hours, and the average weight increase values at the end of 2 hours were %, 5.96% and 4.73%, 18.72% and 16.76% after 24 hours respectively. Flexural strength and modulus of elasticity of the test specimens using pMDI+5% POLIOL glue from mechanical properties were higher than the test specimens using pMDI. The screw holding capacity values of the test samples produced with both pMDI and pMDI+5% POLIOL adhesives were determined as 43.61, 47.22, 35.15 and 47.21, 48.61, 32.47 N/mm² for tangential, radial and transverse surfaces, respectively. It has been determined that both resin types improve some physical and mechanical properties of parallel strand lumber.
