### A study on the specific rate of breakage of cement

Mar 01 2003 Austin et al. show that typical variation of the specific rate of breakage vs. particle size for various ball diameters in a tumbling mill follows the trends shown in Fig. 1.Additionally considering a representative unit volume of mill the rate of ball-on-ball contacts per unit time will increase as ball diameter decreases because the number of balls in the mill increases as 1d 3.