The Study on Modulus of Elasticity (MoE) and Modulus of Rupture (MoR) of Lamina Beams on the Lime Wood (dryobalanops spp.)

Abstract

The aims of this study are to determine the stiffness, flexural strength of lamina beam of lime wood by using both of adhesive Dovebond 30 and Synteko 1909. The testing was conducted based on standard ASTM D 143-05. Data was processed and analyzed by factorial design. The board made by using a log wood with a diameter of more than 40 cm and display 1 m which then split into several pieces of sheet board with 2; 1; 2 cm, thickness 5 cm. The board sheet was cut to a width of 5 cm, 2; 1; 2 cm thick and 71 cm long to make multiple walking joints and types. The entire adhesive resurfacing system was carried out using a cape/brush. Both lamina (double spread) surfaces was sprinkled with 200-220 g/m2 melting weight. The adhesion sliding strength of lime beam used 1.03 kN/cm2 of adhesive Synteko 1909 and 0.84 kN/cm2 of adhesive Dovebond 30. The measured three-layer lamina beam was the measurement results of lime wood that provides the stiffness efficiency (MoE) of 38.91% of solid beam stiffness (MoE) and the flexure strength (MoR) of 10.26% of the flexure strength of the solid beam. Three-layer lamina beam with five finger joints was the measurement result for the highest MoE stiffness of 1,321 kN/cm2 using the adhesive Dovebond 30, and the highest flexure strength of 80.6 kN/cm2 using the adhesive Synteko 1909.