Which one of the following is NOT present in cement ?
- A. \\( 2CaO \\cdot SiO_{2} \\)
- B. \\( 3CaO \\cdot SiO_{2} \\)
- C. \\( 4CaO \\cdot SiO_{2} \\) ✓
- D. \\( 3CaO \\cdot Al_{2}O_{3} \\)
Correct Answer: C. \\( 4CaO \\cdot SiO_{2} \\)
Explanation
Portland cement contains tricalcium silicate (3CaO·SiO2), dicalcium silicate (2CaO·SiO2), and tricalcium aluminate (3CaO·Al2O3). Tetracalcium silicate (4CaO·SiO2) is not a major component.
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