Cement Chemistry
C4AF (Tetracalcium Aluminoferrite)
// Definition
Ferrite phase in OPC. Contributes little to strength but gives cement its grey colour and improves resistance to chemical attack.
C4AF forms 5-15% of clinker. Hydrates quickly with low heat and is more stable against sulfate attack than C3A.
// Related Indian Standards
IS 269
// Cross-references
Cement Hydration
The chemical reaction between cement and water that produces hardened cementitious paste. Hydration generates heat and the binding C-S-H gel that gives concrete its strength.
C3A (Tricalcium Aluminate)
The fastest-reacting aluminate phase in cement. C3A controls initial setting and is responsible for flash setting unless tempered by gypsum.
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