Screw withdrawal properties of Kelampayan and Sesendok Glue-laminated timber

Abstract

Glue-laminated timbers were produced using two species, Kelampayan and Sesendok. Polyvinyl Acetate (PVAc) was used as binder for the glue-laminated timber manufacturing. Screws with same diameter (3.5mm) and length (50mm), but with different angle and distance of pitch were used. The screw-withdrawal test position was selected for 3 direction designated as the surface, front and side. The test result found that both of pitches of screws are suitable for Kelampayan species. In side position, Kelampayan species showed the best screw holding strength and this result is followed by Sesendok species. In surface position, Pitch 2 has highest withdrawal strength for the Kelampayan species. In all position, Pitch 1 is suitable for Sesendok species and Pitch 2 is suitable for Kelampayan species. In both of pitches, Kelampayan attained higher withdrawal strength when compared to Sesendok.