Abstract: Phosphates are a commonly used class of inorganic retarders for portland cement. Normally, previous studies focused on the effects of phosphates on the early hydration of cement paste. In this study, the effects of NH4H2PO4 ...

Abstract: Sulfate plays a critical role in portland cement. The internal gypsum (CaSO4·2H2O) incorporating with clinker controls the hydration of cement, while the external gypsum can attack the hydration products. Magnesium sulfate ...