GATE CE 2022 Set 1 — Question 15
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Structural Engineering → Construction Materials → Cement Properties
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Question
Which of the following equations is correct for the Pozzolanic reaction?
Correct answer
(B) Ca(OH)₂ + Reactive Silicon dioxide + H₂O arrow C-S-H
Solution
The pozzolanic reaction is a chemical reaction that occurs in portland cement concrete upon the addition of pozzolans. It involves the reaction of calcium hydroxide (), which is a byproduct of cement hydration, with reactive silica (silicon dioxide, ) from the pozzolan in the presence of water () to form additional calcium silicate hydrate (C-S-H) gel, which contributes to strength and durability.
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