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Title: Sustainable Calcination of Magnesium Hydroxide for Magnesium Oxychloride Cement Production
Authors: Kastiukas, G
Zhou, X
Neyazi, B
Wan, KT
Issue Date: 27-Apr-2019
Publisher: American Society of Civil Engineers
Citation: Journal of Materials in Civil Engineering, 2019, 31 (7), pp. 1 - 9
Abstract: Effects of varying calcination conditions on the chemical and physical properties of magnesium oxide (MgO), an essential component of magnesium-based cement, were investigated using the more sustainable precursor material of magnesium hydroxide [Mg(OH)2Mg(OH)2]. Extremely pure and thus more reactive MgO was obtained using a 17.6% less-energy-intensive calcination regime compared with industrial-grade MgO obtained from the calcination of dolomitic lime. As a result, the magnesium oxychloride cement (MOC) that was produced from the sustainably sourced MgO obtained a 50% increase in flexural strength and 22% increase in compressive strength. This was mostly due to its homogenous microstructure, consisting predominantly of the phase-5 hydration product, verified visually using a scanning electron microscope (SEM) and crystallographically using X-ray diffraction (XRD). Based on these findings, it has been revealed that the calcination therapies currently used in industry are impractical for both economic and sustainability purposes; MgO can be manufactured in a more sustainable and thus more competitive means, as discovered in this study.
ISSN: 0899-1561
Appears in Collections:Dept of Mechanical Aerospace and Civil Engineering Research Papers

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