Magnesium Phosphate Cement an overview . · Fowler, in Failure, Distress and Repair of Concrete Structures, 2009. Magnesium–phosphate cement (MPC) MPC is a blend of magnesium oxide (M g O) and ammonium dihydrogen phosphate (NH 4 H 2 PO 4) that reacts with water to rapidly produce heat and concrete comes prepackaged with cement, .