The Effects of Nano-SiO2 and Type of Lignocellulosic Materials on Physical and Mechanical Properties of Wood-Cement Boards

In this study، the effect of nano-SiO2 in four levels of 0، 1، 2، and 3 percent (weight of cement) and the type of lignocellulosic materials on physical and mechanical properties of woodcement boards manufactured by old corrugated container (OCC) and rice husk have been investigated. Totally 8 treatments were taken that each one had three repetitions. Samples were provided according to DIN EN 634 and physical and mechanical properties، including modulus of rupture، modulus of elasticity، shear strength parallel to surface، hardness، water absorption and thickness swelling after 2 & 24 hours immersion in water، have been measured. The Results indicated that in case of using nano-SiO2، OCC-cement boards incorporating 1 percent and rice husk-cement boards incorporating 2 percent nano-SiO2 had the highest bending strength and modulus of elasticity. Shear strength parallel to surface and hardness were further in boards incorporating 2 percent nano-SiO2. Also، using rice husk in board manufacturing has decreased the water absorption compared to OCC.