Hydration behaviour of magnesium ammonium phosphate cement and stability analysis of its hydration products through thermodynamic modelling

Hydration behaviour of magnesium ammonium phosphate cement and stability analysis of its hydration products through thermodynamic modelling

Han, Weiwei (Southeast University, China)
Chen, Huisu (Southeast University, China)
Zhang, Tao (Southeast University, China)

2021-04-29

Magnesium ammonium phosphate cement (MAPC) has been commonly applied in civil engineering. However, the analysis of hydration behavior and composition of solid assemblages still needs further exploration. From thermodynamic simulation, it is shown that the molar ratio between MgO and NH4H2PO4 (M/P ratio) determines the final composition of hydration products, When M/P ratio is lower than 0.49, the solid assemblage is (NH4)2Mg(PO4)2·4H2O; When M/P ratio is between 0.49 and 1.00, the solid assemblages are (NH4)2Mg(HPO4)2·4H2O, MgHPO4·3H2O, MgNH4PO4·6H2O and unreacted MgO; When M/P ratio is higher than 1.00, the composition of solid assemblages is MgNH4PO4·6H2O and unreacted MgO.

M/P molar ratio
MAPC
thermodynamic simulation

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