Question

Hydration of which compound is responsible for increase in strength of cement in later age?

• A. Tricalcium Aluminate $\left(C_{3}A\right)$
• B. Tetracalcium Aluminoferrite $\left(C_{4}AF\right)$
• C. Tricalcium Silicate $\left(C_{3}S\right)$
• D. Dicalcium Silicate $\left(C_{2}S\right)$

Answer 1

The correct option is D Dicalcium Silicate $\left(C_{2}S\right)$

$C_{3}S$ and $C_{2}S$ are responsible for strength. $C_{3}S$ contributes most to the strength development during the first four weeks. $C_{2}S$ influences the gain in strength from 4 weeks onwards. At the age of about one year; the two compounds contribute approximately equally to ultimate strength.