Abstract
The ban on asbestos-cement roofing sheets in many countries has contributed to the search for more environmentally friendly roofing materials. This study examined the effects of different cement admixtures and accelerated curing on physico-mechanical properties of coconut husk fibre-reinforced composite roofing tiles. Incineration temperatures were 800 °C for Rice husk Ash (RHA), 500 °C for Chicken Eggshell Ash Type 1(CESA1) and 900 °C for Chicken Eggshell Ash Type 2 (CESA2) which was hydrolysed before use. Calcium Carbide Waste (CCW) and Limestone Portland Cement (LPC) were also used as admixtures. For composite manufacture, fibre content was 4% of cement mass; cement: water mass ratio was 0.4, and cement: sand ratio was 1:2. A super-plasticizer of 0.3% of cement mass was added. Cement admixtures were 70% OPC + 15%RHA + 15%CESA; 70%LPC + 15%CCW + 15%CESA; and 70%LPC + 7.5%RHA + 7.5% CCW + 15% CESA. Control specimens were thermally cured at 60 °C for 5 days. The specific gravity and Thermal-Degradation-Temperature (TDT) of raw materials were determined. The CO2- cured specimens were exposed to 15% CO2 at 60 °C, 60% RH and 0.34 MPa for 9 h. Six, 160 × 40 × 6 mm3 replicate samples were tested to determine composite Bulk Density (BD), Moisture Contents (MC), Water Absorption (WA), and Modulus of Rupture (MOR). Micrographs of specimens were obtained using Scanning Electron Microscope (SEM). Composite bulk density (1.77–2.14 g/cm3) and WA (6.9–16.1%) were relatively high. Partial replacement of cement with RHA, CCW and CESA reduced the bulk density and increased the WA, particularly in the thermally cured CESA1-based samples. The MOR (9.2–12.9 MPa) of the CO2-cured CESA2 samples were higher than the CESA1 samples and control. Micrographs showed acceptable fibre–matrix interaction in all tested samples.
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Adeniji, A.O., Olorunnisola, A.O., Savastano, H. (2023). Effects of Selected Cement Admixtures and Accelerated Curing on Physico-Mechanical Properties of Coconut Husk Fibre-Reinforced Composite Roofing Tiles. In: Jawaid, M., Midani, M., Khiari, R. (eds) Proceedings of 2nd World Conference on Byproducts of Palms and Their Applications. ByPalma 2020. Springer Proceedings in Materials, vol 19. Springer, Singapore. https://doi.org/10.1007/978-981-19-6195-3_11
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