Effect of Rubberwood Fly Ash on Thermal Conductivity of Cement Fiber Board
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Abstract
This research aimed to investigate the influence of rubberwood fly ash on the thermal conductivity of fiber cement sheets made from cement, rubberwood fly ash, paper pulp, and banana fibers. Rubberwood fly ash was used as a replacement for cement at percentages of 0 %, 5 %, 10 %, 15 %, and 20 % by weight of the binder, while the paper pulp and banana fibers were fixed at 46 % and 1 % by weight of the binder. The water-to-binder ratio (w/b) was set at 0.6, and the thickness of the sheets was 10 mm. The sheets were molded using a semi-dry process using a hydraulic pressing machine with a force of 25 tons. The results showed that increasing of the percentage of rubberwood fly ash reduced the thermal conductivity or increased thermal insulation and also improved sound absorption properties. However, it did not significantly affectted density, compressive strength, and tensile strength perpendicular to the surface. The optimal ratio for satisfactory thermal conductivity was a mixture with 20% rubberwood fly ash, which had a thermal conductivity of 0.620 W/mK, higher than the typical cellocrete sheets with only 8 %.
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