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

✍ Scribed by Deng Dehua; Zhang Chuanmei

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 578 KB
• Volume: 26
• Category: Article
• ISSN: 0008-8846
• DOI: 10.1016/0008-8846(96)00101-9

✦ Synopsis

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/MgC& is more than 5, is 5Mg(OH)z*MgC12.8Hz0 (5.1.8 phase), but the product formed in the MOC pastes with the same molar ratio containing CA or C4AF is 3Mg(OH)2.MgC12.8H20 (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.