Rice Husk and Old Corrugated Container Cement Boards: Performance of Nano-SiO۲ on Strength and Dimensional Stability

In this study the effect of nano sized silica particles (nano-SiO۲) on the physical and mechanical properties of rice husk and Old Corrugated Container (OCC)-cement boards was investigated. Modulus Of Rupture (MOR), Modulus Of Elasticity (MOE), Internal Bonding Strength (IB), density, water absorption and thickness swelling after ۲۴ hours immersion in water and hardness were measured. Results showed that rice husk-cement boards with ۲% nano-SiO۲ demonstrated the best physical and mechanical properties. It is related to better distribution and compaction of particles during compression without particles agglomerating. A higher property of ۲%-nano-SiO۲ content rice-husk-cement boards was confirmed by their higher hydration temperature. Addition of ۳% nano-SiO۲ to the mixture reduced the density because of both the substitution of denser cement particles by lighter nano-SiO۲ particles and air-entrapment in the boards. Furthermore, Scanning Electron Microscopy (SEM) analyses showed that the optimum amount of nano-SiO۲ (۲%) can fill micro pores and make a uniform structure with a rough surface which improves properties of composite boards.

کلیدواژه ها:

Cement boards ، Nano-SiO۲ ، Rice husk ، Old Corrugated Container (OCC) ، SEM