The influence of phosphate on the mineral formation of pure mineral C 4A 3 S and C 3S-C 2S-C 4A 3 S -C 4AF-CaSO 4 system and the properties of its cements are studied in this paper.The results show that a small amount of P 2O 5 can improve the burnability,lower the clinkering temperature of the system,and decrease the 3d strength,but improve the 7d,28d strength of the cements obviously.Phosphate can hinder the formation of pure mineral C 4A 3 S .When the amount of P 2O 5 is more than 0....