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. |