Cement mainly contains_________________?
Correct answer: A. CaO, SiO2, Al2O3
- A. CaO, SiO2, Al2O3
- B. MgO, SiO2, K2O
- C. Al2O3, MgO, Fe2O3
- D. CaO, MgO, K2O
Explanation
The principal clinker-forming oxides in cement are CaO, SiO2 and Al2O3, with Fe2O3 also present in smaller proportion. The other combinations omit calcium oxide or list minor oxides as principal constituents.
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