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Volume 12
Issue 6
10.3390/cryst12060857
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Article

The Effect of Doping High Volume Magnesium Sulfate on Properties of Magnesium Oxychloride Cement

by
Qing Huang
1,2,
Weixin Zheng
3,4,*,
Ying Li
5,
Chenggong Chang
3,4,
Jing Wen
3,4,*,
Jinmei Dong
3,4,* and
Xueying Xiao
3,4
1
School of Materials Science and Engineering, Shaanxi University of Technology, Hanzhong 723000, China
2
National and Local Joint Engineering Laboratory for Slag Comprehensive Utilization and Environmental Technology, Hanzhong 723000, China
3
Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China
4
Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining 810008, China
5
China Construction Fifth Engineering Bureau Co., Ltd., Changsha 410014, China
*
Authors to whom correspondence should be addressed.
Crystals 2022, 12(6), 857; https://doi.org/10.3390/cryst12060857
Submission received: 21 May 2022 / Revised: 11 June 2022 / Accepted: 15 June 2022 / Published: 17 June 2022
(This article belongs to the Special Issue Advances in Cement-Based and Construction Materials)
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Abstract

The composite gelling system of chlorine and magnesium thioxide was prepared by mixing different mass fractions of magnesium sulfate solution into MOC. Detailed studies regarding the influences of magnesium sulfate replacing magnesium chloride on the setting time, compressive strength, and water resistance of magnesium oxychloride cement (MOC) have been carried out in this paper. The phase composition and micro morphology of the hydration products in the mixed system were analyzed by XRD and SEM. The results show that the addition of magnesium sulfate prolongs the setting time and reduces the compressive strength of the mixed MOC. Compared with the primordial MOC system, the water resistance of the mixed system improved, with the mixed system exhibiting optimal water resistance when the mass fraction of magnesium sulfate was 30%. The phases of the mixed system were composed of 5Mg(OH)2·MgCl2·8H2O and 5Mg(OH)2·MgSO4·7H2O phases. The microscopic morphology shows that the interior of air-cured MOC was composed of a large number of needle-like crystals, and continuous crystal structures have close contact and a strong bonding force. Cracks and pores appear on the surface after submerging in water, and the crystallization state of the internal crystals becomes worse. The compressive strength and water stability of MOC were closely related to the crystal morphology.
Keywords: magnesium oxychloride cement; magnesium oxysulfate cement; magnesium sulfate; water resistance; setting time; compressive strength magnesium oxychloride cement; magnesium oxysulfate cement; magnesium sulfate; water resistance; setting time; compressive strength

Share and Cite

MDPI and ACS Style

Huang, Q.; Zheng, W.; Li, Y.; Chang, C.; Wen, J.; Dong, J.; Xiao, X. The Effect of Doping High Volume Magnesium Sulfate on Properties of Magnesium Oxychloride Cement. Crystals 2022, 12, 857. https://doi.org/10.3390/cryst12060857

AMA Style

Huang Q, Zheng W, Li Y, Chang C, Wen J, Dong J, Xiao X. The Effect of Doping High Volume Magnesium Sulfate on Properties of Magnesium Oxychloride Cement. Crystals. 2022; 12(6):857. https://doi.org/10.3390/cryst12060857

Chicago/Turabian Style

Huang, Qing, Weixin Zheng, Ying Li, Chenggong Chang, Jing Wen, Jinmei Dong, and Xueying Xiao. 2022. "The Effect of Doping High Volume Magnesium Sulfate on Properties of Magnesium Oxychloride Cement" Crystals 12, no. 6: 857. https://doi.org/10.3390/cryst12060857

APA Style

Huang, Q., Zheng, W., Li, Y., Chang, C., Wen, J., Dong, J., & Xiao, X. (2022). The Effect of Doping High Volume Magnesium Sulfate on Properties of Magnesium Oxychloride Cement. Crystals, 12(6), 857. https://doi.org/10.3390/cryst12060857

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