Influence of phosphate on the composition and properties of alite-sulphoaluminate cement

This paper studies the influence of P2O5 on the mineral composition and the physical and mechanical properties of alite-sulphoaluminate cement. The re sults show that a small amount of P2O5 can improve the burnability and lowe r the clinkering temperature. It may also affect the mineral formation of t he clinkers and decrease the 3 day strength of the cement, but improve the 7 and 28 day strengths. If the amount of P2O5 is higher than 0.5 wt.-% ther e is a considerable decrease in the content of the main minerals C(4)A(3)-( S) over bar and C3S, the free lime increases, there is an appreciable drop in the strength of the cement at the various ages, and the setting time is delayed.