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  4. Portland cement contains the following amount of CaO

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Q. Portland cement contains the following amount of $CaO$

AIIMSAIIMS 2000The s-Block Elements

Solution:

Composition of Portland cement is as follows:
Calcium oxide CaO 61.5%
Silica SiO2 22.5%
Alumina Al2 O 3 7.5%
Magnesium oxide MgO 2.5%
Ferric oxide Fe2O3 2.0%
Potassium oxide K2O 1.5%
Sulphur trioxide SO3 1.0%
Sodium oxide NaO2 1.5%