The Influence Of P2o5 On The Clinker Mineral Composition And Cement Quality

The influence of P2O5 on clinker mineral composition and the cement quality was investigated. When the sewage sludge was used as a raw material in place of clay, the presence of P2O5 in sewage sludge affects the mineral composition and the clinker quality. As the P2O5 concentration in raw mix increases, the bumability of clinker becomes worse and the alite decomposes into belite and free-CaO, so belite increases with the decrease of alite. The early strength of mortar decreases with the increase of P2O5 concentration. On the other hand, later-age strength increases with the increase of belite content. The setting time of cement was delayed with the P2O5 concentration above 0.6 wt%.