Question

Which of the following is the first one to participate in hydration reaction of cement paste?

• A. Dicalcium silicate
• B. Tricalcium silicate
• C. Tricalcium aluminate
• D. Tetracalcium alumino ferrite

Answer 1

The correct option is C Tricalcium aluminate

Ans : (c) : About (70-80)% constituent provided by $C_{3}S$ & $C_{2}S$ to cement and strength by both only but $C_{3}S$ is in having a high rate of heat evolve and high rate of reaction as compared to $C_{2}S$, as $C_{2}S$ is hardened slowly and provide strength slowly and ultimate strength is provided by it only. But early strength of cement is obtained by $C_{3}S$ only.