Abstract
The influence of P₂O? 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 P₂O? in sewage sludge affects the mineral composition and the clinker quality. As the P₂O? concentration in raw mix increases, the burnability 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 P₂O? concentration. On the other hand, later-age strength increases with the increase of belite content. The setting time of cement was delayed with the P₂O? concentration above 0.6 wt%.
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