Effect of Calcination Temperature on Mechanical Properties of Magnesium Oxychloride Cement
In order to make full use of magnesium chloride resources, the development and utilisation of magnesium oxychloride cement have become an ecological and economic goal. Thus far, however, investigations into the effects on these cements of high temperatures are lacking. Herein, magnesium oxychloride...
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2022-01-01
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| author | Chenggong Chang Lingyun An Rui Lin Jing Wen Jinmei Dong Weixin Zheng Fengyun Yan Xueying Xiao |
| author_facet | Chenggong Chang Lingyun An Rui Lin Jing Wen Jinmei Dong Weixin Zheng Fengyun Yan Xueying Xiao |
| author_sort | Chenggong Chang |
| collection | DOAJ |
| description | In order to make full use of magnesium chloride resources, the development and utilisation of magnesium oxychloride cement have become an ecological and economic goal. Thus far, however, investigations into the effects on these cements of high temperatures are lacking. Herein, magnesium oxychloride cement was calcinated at various temperatures and the effects of calcination temperature on microstructure, phase composition, flexural strength, and compressive strength were studied by scanning electron microscopy, X-ray diffraction, and compression testing. The mechanical properties varied strongly with calcination temperature. Before calcination, magnesium oxychloride cement has a needle-like micromorphology and includes Mg(OH)<sub>2</sub> gel and a trace amount of gel water as well as 5 Mg(OH)<sub>2</sub>·MgCl<sub>2</sub>·8H<sub>2</sub>O, which together provide its mechanical properties (flexural strength, 18.4 MPa; compressive strength, and 113.3 MPa). After calcination at 100 °C, the gel water is volatilised and the flexural strength is decreased by 57.07% but there is no significant change in the compressive strength. Calcination at 400 °C results in the magnesium oxychloride cement becoming fibrous and mainly consisting of Mg(OH)<sub>2</sub> gel, which helps to maintain its high compressive strength (65.7 MPa). When the calcination temperature is 450 °C, the microstructure becomes powdery, the cement is mainly composed of MgO, and the flexural and compressive strengths are completely lost. |
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| issn | 1996-1944 |
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| last_indexed | 2024-03-10T01:02:26Z |
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| spelling | doaj.art-4979c1f381444560a1a50c941f4ab9832023-11-23T14:31:54ZengMDPI AGMaterials1996-19442022-01-0115260710.3390/ma15020607Effect of Calcination Temperature on Mechanical Properties of Magnesium Oxychloride CementChenggong Chang0Lingyun An1Rui Lin2Jing Wen3Jinmei Dong4Weixin Zheng5Fengyun Yan6Xueying Xiao7State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, ChinaCollege of Physics and Electronic Information Engineering, Qinghai University for Nationalities, Xining 810007, ChinaKey Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lake, Chinese Academy of Sciences, Xining 810008, ChinaKey Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lake, Chinese Academy of Sciences, Xining 810008, ChinaKey Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lake, Chinese Academy of Sciences, Xining 810008, ChinaKey Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lake, Chinese Academy of Sciences, Xining 810008, ChinaState Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, ChinaKey Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lake, Chinese Academy of Sciences, Xining 810008, ChinaIn order to make full use of magnesium chloride resources, the development and utilisation of magnesium oxychloride cement have become an ecological and economic goal. Thus far, however, investigations into the effects on these cements of high temperatures are lacking. Herein, magnesium oxychloride cement was calcinated at various temperatures and the effects of calcination temperature on microstructure, phase composition, flexural strength, and compressive strength were studied by scanning electron microscopy, X-ray diffraction, and compression testing. The mechanical properties varied strongly with calcination temperature. Before calcination, magnesium oxychloride cement has a needle-like micromorphology and includes Mg(OH)<sub>2</sub> gel and a trace amount of gel water as well as 5 Mg(OH)<sub>2</sub>·MgCl<sub>2</sub>·8H<sub>2</sub>O, which together provide its mechanical properties (flexural strength, 18.4 MPa; compressive strength, and 113.3 MPa). After calcination at 100 °C, the gel water is volatilised and the flexural strength is decreased by 57.07% but there is no significant change in the compressive strength. Calcination at 400 °C results in the magnesium oxychloride cement becoming fibrous and mainly consisting of Mg(OH)<sub>2</sub> gel, which helps to maintain its high compressive strength (65.7 MPa). When the calcination temperature is 450 °C, the microstructure becomes powdery, the cement is mainly composed of MgO, and the flexural and compressive strengths are completely lost.https://www.mdpi.com/1996-1944/15/2/607magnesium oxychloride cementcalcination temperaturemicrostructurephase compositionmechanical properties |
| spellingShingle | Chenggong Chang Lingyun An Rui Lin Jing Wen Jinmei Dong Weixin Zheng Fengyun Yan Xueying Xiao Effect of Calcination Temperature on Mechanical Properties of Magnesium Oxychloride Cement Materials magnesium oxychloride cement calcination temperature microstructure phase composition mechanical properties |
| title | Effect of Calcination Temperature on Mechanical Properties of Magnesium Oxychloride Cement |
| title_full | Effect of Calcination Temperature on Mechanical Properties of Magnesium Oxychloride Cement |
| title_fullStr | Effect of Calcination Temperature on Mechanical Properties of Magnesium Oxychloride Cement |
| title_full_unstemmed | Effect of Calcination Temperature on Mechanical Properties of Magnesium Oxychloride Cement |
| title_short | Effect of Calcination Temperature on Mechanical Properties of Magnesium Oxychloride Cement |
| title_sort | effect of calcination temperature on mechanical properties of magnesium oxychloride cement |
| topic | magnesium oxychloride cement calcination temperature microstructure phase composition mechanical properties |
| url | https://www.mdpi.com/1996-1944/15/2/607 |
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