In Bogue's compound notation used for Portland cement, the symbol 'C' stands for:
A{'text': 'CaCO3 (calcium carbonate)', 'label': 'A'}
B{'text': 'Cement clinker', 'label': 'B'}
C{'text': 'C3S (tricalcium silicate)', 'label': 'C'}
D{'text': 'CaO (calcium oxide)', 'label': 'D'}
Answer & Solution
Correct answer: D. {'text': 'CaO (calcium oxide)', 'label': 'D'}
1. §1.4 lists the symbols: C for CaO, S for SiO2, A for Al2O3, F for Fe2O3, H for H2O.
2. So 'C' in C3S, C2S, C3A and C4AF always refers to CaO.
3. C3S therefore expands to 3CaO.SiO2 (tricalcium silicate).
_Source: IGNOU ET-522 Block-1 Unit-1 Cement, §1.4 (after Table 1.2), p. 7_
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