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

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

Content Provider	MDPI
Author	Huang, Qing Zheng, Weixin Li, Ying Chang, Chenggong Wen, Jing Dong, Jinmei Xiao, Xueying
Copyright Year	2022
Description	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 $5Mg(OH)_{2}·MgCl_{2}·8H_{2}$O and $5Mg(OH)_{2}·MgSO_{4}·7H_{2}$O 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.
Starting Page	857
e-ISSN	20734352
DOI	10.3390/cryst12060857
Journal	Crystals
Issue Number	6
Volume Number	12
Language	English
Publisher	MDPI
Publisher Date	2022-06-17
Access Restriction	Open
Subject Keyword	Crystals Characterization and Testing of Materials Magnesium Oxychloride Cement Magnesium Oxysulfate Cement Magnesium Sulfate Water Resistance Setting Time Compressive Strength
Content Type	Text
Resource Type	Article

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