Concrete gains strength due to ...........
Try it first: pick an option, then read the explanation.
Correct answer: B. Hydration of cement
How Concrete Gains Strength
Concrete gains strength through hydration of cement — the chemical reaction between cement minerals (primarily C3S and C2S) and water. This reaction produces calcium silicate hydrate (C-S-H) gel, which fills the voids in the paste and creates a dense, interlocking microstructure that resists load.
Evaporation of water actually harms strength development (which is why curing is needed). There is no significant chemical reaction between cement and coarse aggregate.
Concrete gains strength through hydration of cement — option B.
Key takeaway
Hydration = cement + water → C-S-H gel → strength. Evaporation stops hydration. Curing preserves moisture to keep hydration going.