Abstract
This study aimed to manufacture oriented wood-cement boards using five Eucalyptus species and mixture between then, to compare the effect of the particles orientation, and to evaluate the physical and mechanical properties according to competent standards. The species studied were: Eucalyptus benthamii, Eucalyptus dunni, Eucalyptus grandis, Eucalyptus saligna, Eucalyptus urograndis the mixture between them and the Pinus taeda as control. The bonding agent employed was commercial grade Portland cement types CP II-Z-32R. The panels had dimensions of 48 x 48 x 1.2 cm and nominal specific mass of 1.2 g/cm³. The cement/wood/water mass ratio used was 2.5:1:1 and 2% of CaCl2 by weight of cement was used as an additive. The orientation of strands did not influence the dimensional stability properties. All boards had very low IB strength, being that, none treatments reached the requirements to internal bond of competent standards. The MOR and MOE results indicated that species mixture can be obtained boards with properties similar to pure species. In general, the boards showed low mechanical strength what can be attributed to particles geometry and wood-cement ratio. The wood of Eucalyptus species presents potential for use in cement-wood panels.
Highlights
Wood-cement boards are products widely used in civil construction, mainly in Asian and European countries, as exterior wall closing material
The wood of Eucalyptus species presents potential for use in cement-wood panels
Oriented strand board (OSB) is a structural reconstituted panel manufactured by consolidating oriented wood strands with an exterior-type, waterproof resin under heat and pressure to make a reconstituted wood product with engineered properties
Summary
Wood-cement boards are products widely used in civil construction, mainly in Asian and European countries, as exterior wall closing material. It is a similar product to particleboards, with differences related to the type of binder and pressing process, which in this case uses cement and pressing at room temperature (IWAKIRI, et al, 2015). This product shows advantages how: satisfactory physical e mechanical strength, relatively light when compared to pure cement due to the presence of wood and can be produced in the most varied sizes.
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