Study on Property of Shell-based Ecological Cement Clinker

The shell-based ecological cement clinker was prepared by sea shells,clay and fly ash and iron powder,and then the performance of the Black and compact clinker and the physical and hydration properties of the cement were studied by XRD,SEM and physical examination.The results show that each index of the cement conforms to China standard GB175-2007 Common Portland Cement,prepared at 1350 ℃ for 20 min.There are alite,belite,C3A and C4AF and a small quantity of C12A7·CaCl2 in the clinker.The skeleton of the structure of the cement stone is constituted mainly by AFt,with C-S-H gel filling the pores and Ca(OH)2 crystal included.The work confirms that it is feasible to prepare P.O52.5 portland cement by sea shell during fast firing at low temperature.