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Q: Out of constituents of cement namely, tri calcium silicate (C₃S), dicalcium silicate (C₂S), tri calcium aluminate (C₃A) and tetracalcium alumino ferrite (C₄AF) the first to set and harden is
  • A. C₃S
  • B. C₂S
  • C. C₃A
  • D. C₄AF
Correct Answer: Option C - Tetra calcium aluminoferrite (C₄AF) (8–10%)– It is responsible for flash set but generates less heat. Tricalcium aluminate (C₃A): It react rapidly with water and is responsible for flash setting with 9–12%. Dicalcium sillicate (C₂S): It gives ultimate strength. Tricalcium sillicate (C₃S): It is responsible for 28 days strength that is early maximum strength with 30–50%.
C. Tetra calcium aluminoferrite (C₄AF) (8–10%)– It is responsible for flash set but generates less heat. Tricalcium aluminate (C₃A): It react rapidly with water and is responsible for flash setting with 9–12%. Dicalcium sillicate (C₂S): It gives ultimate strength. Tricalcium sillicate (C₃S): It is responsible for 28 days strength that is early maximum strength with 30–50%.

Explanations:

Tetra calcium aluminoferrite (C₄AF) (8–10%)– It is responsible for flash set but generates less heat. Tricalcium aluminate (C₃A): It react rapidly with water and is responsible for flash setting with 9–12%. Dicalcium sillicate (C₂S): It gives ultimate strength. Tricalcium sillicate (C₃S): It is responsible for 28 days strength that is early maximum strength with 30–50%.