Physical and mechanical properties of belangke (Gigantochloa pruriens) bamboo laminated boards modified with citric acid

Abstract

Belangke bamboo can be used to produce laminated boards due to its good mechanical properties. This study investigates the physical and mechanical properties of laminated boards from belangke bamboo at various immersion times of citric acid. Bamboo lamina is arranged into laminated boards (3 layers of bamboo lamina) with dimensions of 30 x 15 x 1.5 cm (Length x Width x Thickness). Laminated boards were glued using isocyanate adhesive with glue spread level of 280 g/m2. Testing of this laminated board includes physical and mechanical properties. Testing of physical properties, including weight percent gain (WPG), density, moisture content (MC), and delamination. Meanwhile, mechanical properties include modulus of elasticity (MOE), modulus of rupture (MOR), and shear strength. The physical and mechanical properties of belangke bamboo laminated in this study resulted in WPG values ranging from 7.00-10.00%, density with a range of 0.79–0.86 g/cm3, moisture content with a range of 11.86-12.67%, delamination ranged from 0.00-7.77%, MOE ranged from 113686-127378 kg/cm2, MOR ranged from 516.97–578.95 kg/cm2, and shear strength ranged from 20.53–27.73 kg/cm2. The best of the physical and mechanical properties of citric acid-modified belangke laminated boards in this study were laminated boards with 24-hour immersion time