RESEARCH ON THE WATER-RESISTANCE OF MAGNESIUM OXYCHLORIDE CEMENT——I:THE STABILITY OF THE REACTION PRODUCTS OF MAGNESIUM OXYCHLORIDE CEMENT IN WATER
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition1994年第3期
论文作者：张传镁 邓德华
文章页码：51 - 59
摘 要：<正>In this paper.the change of the crystalline phasesin hardened magnesium oxychloride cement（MOC）paste inwater was analyzed by XRD.It was developed that the reactionproducts 5 phase or 3 phase of MOC are instable in water andcan be changed into Mg（OH）2 by the action of water,whichcauses the content of 5 phase or 3 phase to be less and less,thecontent of Mg（OH）2 to be more and more and the strength to bethe lower the lower,after hardended MOC paste was immersedin water.The change of 5 phase and 3 phase into Mg（OH）2 isnot a dissolve process,but a hydrolysis process.The hydrolysisproducts of 5 phase and 3 phase are Mg（OH）2 precipitationand soluble Cl-,Mg+ ions and H2O.The hydrolysis is sponta-neous thermodlynamically and its chemical kinatic equation is C=Coe-kt Thus,it is suggested that only by enhancing the stabilityof 5 phase or 3 phase in water and preventing 5 phase or 3phase from the hydrolyzing can the water resistance of MOC beimproved well.
张传镁，邓德华
摘 要：<正>In this paper.the change of the crystalline phasesin hardened magnesium oxychloride cement（MOC）paste inwater was analyzed by XRD.It was developed that the reactionproducts 5 phase or 3 phase of MOC are instable in water andcan be changed into Mg（OH）2 by the action of water,whichcauses the content of 5 phase or 3 phase to be less and less,thecontent of Mg（OH）2 to be more and more and the strength to bethe lower the lower,after hardended MOC paste was immersedin water.The change of 5 phase and 3 phase into Mg（OH）2 isnot a dissolve process,but a hydrolysis process.The hydrolysisproducts of 5 phase and 3 phase are Mg（OH）2 precipitationand soluble Cl-,Mg+ ions and H2O.The hydrolysis is sponta-neous thermodlynamically and its chemical kinatic equation is C=Coe-kt Thus,it is suggested that only by enhancing the stabilityof 5 phase or 3 phase in water and preventing 5 phase or 3phase from the hydrolyzing can the water resistance of MOC beimproved well.
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