The effect of aluminate minerals on the phases in magnesium oxychloride cement

The effects of aluminate minerals on the phases and strengths of magnesium oxychloride cement (MOC) have been studied. The X-ray diffraction examination results showed that the addition of small quantities of the hydraulic aluminate minerals can cause the conversion of the reaction products in MOC p...

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Bibliographic Details
Published in:Cement and concrete research 1996, Vol.26 (8), p.1203-1211
Main Authors: Dehua, Deng, Chuanmei, Zhang
Format: Article
Language:English
Subjects:
Analysis of cement phases and constituents
Applied sciences
Buildings. Public works
Cement concrete constituents
Cements
Exact sciences and technology
Materials
Miscellaneous
Properties of anhydrous and hydrated cement, test methods
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Summary:The effects of aluminate minerals on the phases and strengths of magnesium oxychloride cement (MOC) have been studied. The X-ray diffraction examination results showed that the addition of small quantities of the hydraulic aluminate minerals can cause the conversion of the reaction products in MOC paste, but the addition of the inert aluminate minerals can not. The product formed in plain MOC paste, which the molar ratio of MgO MgCl 2 is more than 5, is 5Mg(OH) 2 · MgCl 2 · 8H 2O (5.1.8 phase), but the product formed in the MOC pastes with the same molar ratio containing CA or C 4AF is 3Mg(OH) 2 · MgCl 2 · 8H 2O (3.1.8 phase). It is considered that the phase conversion could be related to the hydration products of the hydraulic aluminate minerals in the MOC paste. The results of the compressive strength measurement indicate that the addition of small quantities of the hydraulic aluminate minerals would not influence the strengths of the hardened MOC paste.
ISSN:0008-8846
1873-3948
DOI:10.1016/0008-8846(96)00101-9