Which of the following compounds is responsible for the first 7 days strength of cement?

Question: Which of the following compounds is responsible for the first 7 days strength of cement? A C₂S (Dicalcium Silicate) B C₃A (Tricalcium Aluminate) C C₄AF (Tetracalcium Aluminoferrite) D C₃S (Tricalcium Silicate) Answer: C₃S (Tricalcium Silicate)

Name of compound	Description
C₃S (Tricalcium Silicate)	Mainly responsible for the early strength developed in the first week of hardening.
C₂S (Dicalcium Silicate)	Contributes to strength development, but its effect becomes more pronounced in later stages, beyond the first week.
C₃A (Tricalcium Aluminate)	Plays a role in early strength but is also responsible for the heat of hydration.
C₄AF (Tetracalcium Aluminoferrite)	Contributes to early strength, although it’s less significant than C3S.
Alumina and Iron Compounds	Present in lesser amounts and make little direct contribution.

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Which of the following compounds is responsible for the first 7 days strength of cement?
By: Prof. Dr. Fazal Rehman | Last updated: February 3, 2024

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