Some Characteristic Analyses in the Hydration System of Polyacrylamide-monocalcium Aluminate Hu Shuguang(Assoc. Prof., Dept. of Material Engineering, WUT, Wuhan 430070,China.)The development regularity of ionic concentration and hydration heat inthe hydration system of polyacrylamide and monocalucium aluminate have been studied,and the reaction products were analyszed by XRD. Two kinds of the different hydrationcharacteristic were discussed and the res.ults gave the direct proof for the reaction mechanism between polymer and cement.: polymer cement; MDF cement; hydration reaction