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Q.
The average composition of portland cement is
The s-Block Elements
Solution:
Port land cement consists of raw materials mainly compounds of lime mixed with silica and alumina.
$CaO \rightarrow 50-6096$
$SiO _{2} \rightarrow 20-2596$
$Al _{2} O _{3} \rightarrow 5-10 \%$
$F e _{2} O _{3} \rightarrow 1-29$
$MgO \rightarrow 2-396$
$SO _{3} \rightarrow 1-2 \%$
and few amount of oxides of iron, magnesium and sulphur.