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Q.
Percentage of $CaO$ present in Portland cement is
The s-Block Elements
Solution:
The average composition of Portland cement is $CaO , 50-60 \% ; SiO _{2}, 20-25 \% ; Al _{2} O _{3}, 5-10 \% ; MgO$, $2-3 \% ; Fe _{2} O _{3}, 1-2 \%$ and $SO _{3}, 1-2 \%$.
Thus, the percentage of $CaO$ present in Portland cement is $50-60 \%$.