Journal
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
Volume 24, Issue 3, Pages 476-481Publisher
JOURNAL WUHAN UNIV TECHNOLOGY
DOI: 10.1007/s11595-009-3476-3
Keywords
magnesium oxychloride cement; molar ratio; phase stability; hydration reaction
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Funding
- National Natural Science Foundation of China [50078019]
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Formation, solution and phase change of hydration products in MgO-MgCl2-H2O system was studied with thermodynamics method, and resistance to water immersion and phase change of magnesium oxychloride cement with different MgO/MgCl2 molar ratio was experimented. The results show that pH value of immersion solution of cement paste has a remarkable influence on phase stability of hydration products. A higher pH value leads to a lower solubility and a better phase stability of hydration products. When the solution pH value is higher than 10.37, the precipitation of much Mg(OH)(2) crystal induces a worse phase stability of hydration products. With the increasing MgO/MgCl2 molar ratio (lower than 6), the more amount of MgO in the hydration products enhances the alkalinity of solution and the phase stability is improved. However, when the MgO/MgCl2 molar ratio is higher than 6 and the excessive MgO exsits in the hydration products, the cement paste may be damaged by the excessive crystallization stress of a great deal of Mg(OH)(2) formation.
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