Effect Lignocellulosic Materials on Hydration Process, Vicat and Mechanical Properties of Gypsum Bonded Particle Board

Gypsum-bonded particleboard panels were made from various mixture of bagasse (Saccharum ossicinarum l.) and wheat (Oryza sativa l.) straw particles bonded with different ratio level of particles/gypsum. This study examined possible feasibility of bagasse and wheat straw particles in the production of gypsum-bonded particleboard (GBPB). One-layer experimental GBPB with density of 1.05 and 1.20 g/cm3 29 were manufactured at bagasse/wheat straw ratio of 100:0, 93.75:6.25, 87.50:12.50, 75:25, 50:50, 25:75 and 0:100 using two particle/gypsum compositions of 1:2.75 and 1:3.25 and density of 1.05 and 1.20 g/cm3. Modulus of rupture (MOR), modulus of elasticity (MOE) and internal bond (IB) characteristics of the boards and gypsum dough hydration process were evaluated. statistical analysis was performed in order to examine possible feasibility of these agricultural residues in commercial GBPB manufacturing. hydration results showed that , using lignocellulosic materials with higher extractives led to a reduced hydration temperature and increasing of hardening time of the mineral . The experimental results have shown that the MOR and MOE of boards containing 0%, 6.25% and 12.5 % wheat straw with LR/G ratio level of 1/2.75 were higher than those of manufactured panels.. In general, boards with a higher amount of bagasse ratio showed superior strength properties.