The Effect of Tricalcium Silicate (C3S) Percentage in Clinkerson the Cement Quality

Composite cement products produced by national cement factories in Indonesia should follow the required quality standards. The quality standard of composite cement refers to the SNI 7064:2014. Some physical parameters of the quality standards set are mortar compressive strength and autoclave expansion. Compressive strength is influenced by C 3 S and C 2 S in the clinker. The reaction of the formation of mineralogical compounds occurs when clinkers formed. Whereas the expansion by autoclave is influenced by the levels of free lime in the cement. This research was conducted to determine the effect of the percentage of tricalcium silicate (C 3 S) on the quality of cement with free lime 2% with variations of C 3 S in clinkers, namely 55%, 57%, 59%, 61%, 63%, 65%, and 67%. Physical parameters tested in this study are compressive strength of mortar, blaine, and autoclave expansion. While the chemical parameters tested in this study are free lime in cement and SO 3 . Based on the research, it was found that if the same percentage of C 3 S quality of cement having FCaO 2%, the ideal condition of the development of compressive strength for FcaO > 2%, 3 to 7 days was at the percentage of C 3 S clinker of 63,48%. Whereas the development of ideal compressive strength for 7 to 28 days is at the clinker C 3 S percentage of 64,85%. For FCaO 2%.