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Abstract
The aim of this study was to consider the use of biomass wood ash as a partial replacement for cement material in wood-cement particleboards. Wood-cement-ash particleboards (WCAP) were made with 10%, 20%, 30%, 40%, and 50% of wood ash as a partial replacement for cement with wood particles and tested for bending strength, stiffness, water absorption, and thermal properties. Test results indicate that water demand increases as the ash content increases, and the mechanical properties decrease slightly with an increase of the ash content until 30% of replacement. On the other hand, the heat capacity increases with the wood ash content. The WCAP can contribute to reducing the heat loss rate of building walls given their relatively low thermal conductivity compared to gypsum boards. The replacement of cement to the extent of approximately 30% by weight was found to give the optimum results.
Highlights
IntroductionAsbestos was used as the reinforcing material, but due to the health hazards involved, it was replaced by cellulose in the 1980s
Fiber cement panels have been on the market for a long time
The wood-cement mixtures were prepared with air-dried wood chips obtained from white spruce (Picea glauca (Moench), Voss, Norway) trees harvested at the Petawawa Research Forest in Mattawa (ON), Canada
Summary
Asbestos was used as the reinforcing material, but due to the health hazards involved, it was replaced by cellulose in the 1980s Nowadays, these panels are used as exterior siding, roof shingles, and tiles for exterior applications. The results of Tittelein et al [4] show that it is possible to make low-density (specific gravity of about 0.7) wood-cement particleboards with better bending properties than gypsum boards and a screw-withdrawal resistance that is 1.7 times higher. These panels can be cut with a knife in a similar manner as gypsum boards. Thanks to its high porosity, the thermal conductivity of wood-cement particleboards is about three times lower than that of gypsum boards
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