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The Effect of Lamina on the Glulam Properties made from Combination Keruing (Dipterocarpaceae) and Sengon (Paraserianthes falcataria)
Abstract:
Indonesia has many fast-growing tree species; however, they have low quality and limited use. To obtain better performance of fast-growing species as construction material, it needs to be combined with high-grade wood to produce glulam. This research observed the effect of combining sengon (Paraserianthes falcataria) and keruing (Dipterocarpaceae) on the strength, stiffness, and damage of glulam beams.
Preliminary testing was done to obtain physical and mechanical properties of clear specimen on sengon and keruing wood. Testing method followed ISO-1976 standard. Twelve of glulam beam specimens had 70 mm width, 200 mm depth, and 3,000 mm length. They were made four variations that consisted of sengon percentage of 100, 75, 50, and 10. Each layer of lumber glued with thermosetting urea formaldehyde (UA-104) adhesive at pressure 1 up to 1, 1 MPa for 10 hours pressing time. The static lateral loading was done continuously until beam damage.
The results showed that sengon was of low density and with strength class V, while keruing was with strength class II. The result of glulam beams testing indicated that strength and stiffness of beams increased significantly on sengon percentage 75, 50, and 0. The glulam beams’ strength with sengon percentage 75 and 50 increased up to 88.6 percent and 103.1 percent. The glulam beams’ stiffness increased up to 132.3 percent and 152.7 percent on sengon percentage 75 and 50 percent. The failure of the beams on sengon percentage 100 and 75 were dominated by flexure then followed by shear. Shear failure was dominant on sengon percentage 50 and 0.