Phosphate can hinder the formation of pure mineral C 4A 3 S . When the amount of P 2O 5 is more than 0.5%,the content of main mine ral C 4A 3 S and C 3S remarkably decrease,free lime increase,and the various age strength of the cements obviously decrease.

• 磷阻碍C4A3S单矿物的形成，当P2O5达0.；5%25以上时，系统的C4A3S及C3S形成量明显减少，f－CaO升高，水泥各龄期强度均显著降低。