Effect of wood particle geometry and pre-treatments on the strength and sorption properties of cement-bonded particle boards

The effect of particle geometry and pretreatments on the strength and sorption properties of wood particlecement composite boards was investigated. Wood particles (flakes and sawdust) of Gmelina arborea were mixedwith cement and water in the production of composite boards. The wood particles were pretreated with hot water,calcium chloride and a combination of both treatments to enhance bonding with cement. The slurry was poured intorectangular moulds for board formation. After demoulding, the boards formed were tested for modulus of rupture(MOR), modulus of elasticity (MOE), water absorption (WA) and thickness swelling (TS). The results revealed thatthe mean MOR for flakes boards was 3.23N mm-2 while the mean MOR for sawdust boards was 3.01N mm-2. Hotwater and calcium chloride treatment produced the best effect in flake composite boards with MOR and MOE valuesof 6.90 N/mm2 and 1897.36 N mm-2 while sawdust composite boards had mean MOR and MOE values of 5.69Nmm-2 and 1664.31N mm-2 respectively. The WA rate after 24 hours of flakes and sawdust boards treated with hotwater and calcium chloride was 3.63% and 4.28% while the TS rate was 0.69% and 1.44% respectively. Particlegeometry and pretreatments significantly improved strength and sorption properties of wood particle cementcomposite boards (p<0.05)