Discussion
A pozzolana contributes to strength by reacting with
Answer: C
Correct answer: the calcium hydroxide liberated during hydration
Hydration of the silicates produces calcium hydroxide, which contributes nothing to strength and is the phase most readily leached or attacked. A pozzolana - fly ash, silica fume, calcined clay - reacts with it to form more calcium silicate hydrate. The result is more of the useful phase, less of the vulnerable one, and hence a denser and more durable concrete.
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