© IMCET 2022. All rights reserved.In this study, the effect of the fine particle size (-0.300 + 0.090 mm) of the material forming the composition, which was not studied before was investigated on the kinetic model parameters of CEM II and CEM IV cement samples, which are in the blended cement class. Then, specific breakage rate and cumulative breakage distribution functions were obtained from the size distributions was taken at different grinding times in a single material fill and ball fill ratio in a laboratory diameter ball mill (200×200 mm). In the study, fine sieve sizes were chosen in order to give more accurate results in the design, modeling and simulation studies of cement production processes. It was observed that the upper sieve size was faster broken down to a lower sieve size and the original part was reduced to the lower sieve size more quickly with the decrease in the amount of clinker, one of the cement components.