UPSC NDA 2 2019 General Ability Solved Paper

Question : 60 of 150

Marks: +1, -0

The raw materials used for the manufacture of Portland cement are:

[NDA II 2019]

Common Name	Oxide	Appropriate Composition Limits (in %)
Lime	CaO	60-66
Silica	SiO2	19-25
Alumina	Al_2O_3	3-8
Iron oxide	Fe2O3	1-5
Magnesia	MgO	0-5
Alkalies
Soda	Na2O	0.5-1
Potassa	K2O	0.5-1
Sulphur Trioxide	SO3	1-3

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