Effect of Calcination Temperature on Mechanical Properties of Magnesium Oxychloride Cement

doi:10.3390/ma15020607

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	Effect of Calcination Temperature on Mechanical Properties of Magnesium Oxychloride Cement
	Chang, Chenggong 2,3,4; An, Lingyun 1; Lin, Rui 3,4; Wen, Jing 3,4; Dong, Jinmei 3,4; Zheng, Weixin 3,4; Yan, Fengyun 2; Xiao, Xueying 3,4
刊名	MATERIALS
	2022
卷号	15 期号:2
关键词	magnesium oxychloride cement calcination temperature microstructure phase composition mechanical properties
DOI	10.3390/ma15020607
英文摘要	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)(2) gel and a trace amount of gel water as well as 5 Mg(OH)(2)center dot MgCl2 center dot 8H(2)O, which together provide its mechanical properties (flexural strength, 18.4 MPa; compressive strength, and 113.3 MPa). After calcination at 100 degrees 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 degrees C results in the magnesium oxychloride cement becoming fibrous and mainly consisting of Mg(OH)(2) gel, which helps to maintain its high compressive strength (65.7 MPa). When the calcination temperature is 450 degrees C, the microstructure becomes powdery, the cement is mainly composed of MgO, and the flexural and compressive strengths are completely lost.
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering ; Physics
语种	英语
出版者	MDPI
WOS记录号	WOS:000747806400001
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/154887]
专题	兰州理工大学
作者单位	1.Qinghai Univ Nationalities, Coll Phys & Elect Informat Engn, Xining 810007, Peoples R China 2.Lanzhou Univ Technol, State Key Lab Adv Proc Recycling Nonferrous Met, Lanzhou 730050, Peoples R China; 3.Chinese Acad Sci, Qinghai Inst Salt Lake, Key Lab Comprehens & Highly Efficient Utilizat Sa, Xining 810008, Peoples R China; 4.Key Lab Salt Lake Resources Chem Qinghai Prov, Xining 810008, Peoples R China;
推荐引用方式 GB/T 7714	Chang, Chenggong,An, Lingyun,Lin, Rui,et al. Effect of Calcination Temperature on Mechanical Properties of Magnesium Oxychloride Cement[J]. MATERIALS,2022,15(2).
APA	Chang, Chenggong.,An, Lingyun.,Lin, Rui.,Wen, Jing.,Dong, Jinmei.,...&Xiao, Xueying.(2022).Effect of Calcination Temperature on Mechanical Properties of Magnesium Oxychloride Cement.MATERIALS,15(2).
MLA	Chang, Chenggong,et al."Effect of Calcination Temperature on Mechanical Properties of Magnesium Oxychloride Cement".MATERIALS 15.2(2022).