Portland cement consists mainly of__________________?
Correct answer: B. CaO & SiO2
- A. SiO2 & Al2O3
- B. CaO & SiO2
- C. CaO & Al2O3
- D. CaO & Fe2O3
Explanation
Portland cement is dominated by calcium silicates, so its principal oxide constituents are calcium oxide and silicon dioxide. Alumina and iron oxide are present in smaller amounts and help form the other cement phases.
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