Which of the following oxide is in the highest percentage in Ordinary Portland Cement ?

Iron Oxide

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Magnesium Oxide

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Calcium Oxide

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Aluminium Oxide

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Solution

The correct option is C Calcium Oxide

Oxide Composition Average

Lime (CaO) 60 - 65 63

Silica $(S i O_{2})$ 17 - 25 20

Alumina $(A l_{2} O_{3})$ 3 - 8 6

Iron Oxide $(F e_{2} O_{3})$ 0.5 - 6 3

Magnesia (Mgo) 0.5 - 4 2

Soda and Potash $(N a_{2} O + K_{2} O)$ 0.5 - 1 1

Sulphur Trioxide, SO $_{3}$ 1 - 2 1.5

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