Question

Which of the following is not present in Portland cement?

• A. Ca₃SiO₄
• B. Ca₃SiO₅
• C. Ca₃(PO₄)₂
• D. Ca₃Al₂O₆

Hint:

Remember cement compounds as: C₃S, C₂S, C₃A, C₄AF

Answer 1

The Correct Option is A

Step 1: Main constituents of Portland cement are: \beginitemize • Tricalcium silicate — Ca₃SiO₅ • Dicalcium silicate — Ca₂SiO₄ • Tricalcium aluminate — Ca₃Al₂O₆ • Tetracalcium aluminoferrite \enditemize Step 2: Ca₃SiO₄ is not a constituent of Portland cement.