Which compound in Portland cement is responsible for the early strength gain (3-7 days) and also generates the highest heat of hydration?
Choose the correct answer
C2S (Dicalcium silicate)
C3A (Tricalcium aluminate)
C3S (Tricalcium silicate)
C4AF (Tetracalcium aluminoferrite)
Correct Answer
C. C3S (Tricalcium silicate)
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C3S hydrates rapidly, gives strength in 1-4 weeks, and generates high heat. C2S hydrates slowly, contributes to long-term strength (after 28 days), low heat. C3A: fastest hydration, highest heat, responsible for flash set (gypsum added to retard it). C4AF: moderate hydration, gives grey colour.
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