Sorptivity and acid resistance of ambient-cured geopolymer mortars containing nano-silica |
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| Affiliation: | 1. Department of Materials Engineering, Saveh Branch, Islamic Azad University, Saveh, Iran;2. Young Researchers and Elites Club, Saveh Branch, Islamic Azad University, Saveh, Iran;1. Department of Civil Engineering, Harran University, Şanlıurfa, Turkey;2. Department of Civil Engineering, Hasan Kalyoncu University, Gaziantep, Turkey;3. Department of Civil Engineering, Diyala University, Diyala, Iraq;1. Department of Imaging & Applied Physics, Curtin University, GPO Box U1987, Perth, WA 6845, Australia;2. Department of Physics, Umm Al-Qura University, P.O. Box 715, Makkah, Saudi Arabia;3. Department of Civil Engineering, Curtin University, GPO Box U1987, Perth, WA 6845, Australia;1. Centre for advanced Concrete Research, SRM Institute of Science and Technology, Kattankulathur, 603203, Chennai, India;2. Department of Chemistry, SRM Institute of Science and Technology, Kattankulathur, 603203, Chennai, India |
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| Abstract: | This study investigated the effects of nano-silica on flowability, strength development, sorptivity and acid resistance properties of fly ash geopolymer mortars cured at 20 °C. The changes in mass, compressive strength and microstructure of the specimens after immersion in acid solutions for different durations were determined. The microstructures were studied by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD) analysis. It was found that addition of nano-silica in geopolymer mortars based on fly ash alone or fly ash blended with 15% GGBFS or 10% OPC improved the compactness of microstructure by reducing porosity. Thus, the nano-silica reduced sorptivity and increased compressive strength of the mixes. The average mass loss after 90 days of immersion in acid solutions reduced from 6.0% to 1.9% by addition of 2% nano-silica. Similarly, significant reduction in strength loss after immersion in acid solution was observed in the specimens by using nano-silica. |
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| Keywords: | Acid resistance Ambient curing Fly ash Geopolymer Nano-silica Sorptivity |
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