Sustainable Calcination of Magnesium Hydroxide for Magnesium Oxychloride Cement Production

被引：19
作者：
Kastiukas, Gediminas [1 ]
Zhou, Xiangming [1 ]
Neyazi, Babar [1 ]
Wan, Kai Tai [1 ]
机构：
[1] Brunel Univ London, Dept Civil & Environm Engn, Uxbridge UB8 3PH, Middx, England
来源：
JOURNAL OF MATERIALS IN CIVIL ENGINEERING | 2019年 / 31卷 / 07期
基金：
欧盟地平线“2020”;
关键词：
REACTIVITY; OXIDE; HYDRATION;
D O I：
10.1061/(ASCE)MT.1943-5533.0002786
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
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)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.
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页数：9
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