Abstract
In all the sectors of the economy, issues about sustainable solid waste management and recycling have become increasingly prominent. On the other side, the total energy consumption is dramatically increasing all over world and much of the energy demand lies on building energy consumption for thermal insulation purpose, high-temperature packaging or encapsulating materials. From this point of view, current research explores the possibility of using industrial waste from thermal power plants as a replacement for binder in traditional Portland cement by chemical reaction. Design of composite using 20% partially replacement of fly ash in cement binder (FOPC) and alkali-activated cement (AAFSC) using high-volume fly ash with GGBS as an additive in 4:1 mass ratio, harden at room temperature to study the thermal insulation property. The effect of temperature in the wide range from 30 to 800 °C on thermal conductivity and compressive strengths was evaluated, and the results are compared. The calcium hydroxide groups irrespective of fly ash addition in Portland cement matrix begin to decompose at 300–400 °C and calcium carbonate at 700 °C and melt at 800 °C that were evidenced from thermal stability studies. The thermal impact on strength and mass loss is greatly reduced in AAFSC, provided 50% of virgin strength at 800 °C. The composites comprising FOPC covered by AAFSC and vice versa studied by varying binder-to-filler ratio as 1:1 and 1:2. AAFSC cover integrated well, whereas FOPC drastically failed to retain the structure. Finally, this study confirmed on given thermal-resistant properties and environmental effect, the alkali-activated cement prepared from low energy intensive path be a best option for thermal-resistant building construction.
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Acknowledgements
This work was supported by the DST WMT [grant number DST/TDT/WMT/2017]; DST-FIST sponsored facilities from the Department of Chemistry, SRMIST has been utilised. The assistance of Late Dr R Gopalakrishnan, Department of physics and nano technology during experimentation was greatly acknowledged.
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Natarajan, P., Sivasakthi, M., Revathi, T. et al. A comparative study on fly ash pozzolanic cement mortar and ambient-cured alkali-activated fly ash–GGBS cement mortar after exposure to elevated temperature. Innov. Infrastruct. Solut. 7, 30 (2022). https://doi.org/10.1007/s41062-021-00635-5
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DOI: https://doi.org/10.1007/s41062-021-00635-5