The mechanism for soluble phosphates to improve the water resistance of magnesium oxychloride cement

This paper discusses the reasons why the addition of some soluble phosphates to magnesium oxychloride cement (MOC) can greatly improve its water resistance. With the XRD analysis and the determination of the strength retention coefficients (a judging index for the water resistance), it has been shown that the addition of small quantity of the soluble phosphates, such as H3PO4, NaH2PO4·2H2O, and NH4H2PO4, to MOC pastes does not influence the...