The relationship between the Al2O3 contents of the clinkers used in this investigation and
the grinding energy consumption calculated by using the constants A and B given in Table 4
is shown in Fig. 2 for three different specific surface areas (2800, 3400, and 4000 cm2/g).
The overall relationship (solid line) indicates that grinding energy requirement
decreases with increasing Al2O3.
However, an interesting feature of Fig. 2 is that there occurs almost no change in energy
requirement up to Al2O3 contents around 6% and then it decreases sharply (dashed line).
The reduction in energy requirement with increasing alumina contents over 6% becomes
more pronounced as the fineness increases.