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What is Portland cement primarily composed of?

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What is Portland cement primarily composed of?

(a) SiO2

(b) CaO

(c) Fe2O3

(d) MgO

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This interesting question is from Cements, Metallurgical Coke and Synthetic Resins topic in division Miscellaneous Materials of Engineering Material & Metallurgy

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Right option is (b) CaO

Explanation: Portland cement is a common binder used for civil construction purposes. It mainly consists of calcium oxide (over 42%) with carbon dioxide (over 35%), followed by small quantities of Fe2O3, MgO, Al2O3, and over 15% of SiO2.

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