Question:

Which of the following equations is correct for the Pozzolanic reaction?

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In Pozzolanic reactions, silica reacts with calcium hydroxide to form calcium silicate hydrate (C-S-H), which is essential for the hardening of concrete and cement-based materials.
Updated On: Jan 11, 2026
  • Ca(OH)\(_2\) + Reactive Superplasticiser + H\(_2\)O \(\rightarrow\) C-S-H
  • Ca(OH)\(_2\) + Reactive Silicon dioxide + H\(_2\)O \(\rightarrow\) C-S-H
  • Ca(OH)\(_2\) + Reactive Sulphates + H\(_2\)O \(\rightarrow\) C-S-H
  • Ca(OH)\(_2\) + Reactive Sulphur + H\(_2\)O \(\rightarrow\) C-S-H
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The Correct Option is B

Solution and Explanation

Pozzolanic reactions involve the combination of calcium hydroxide (Ca(OH)\(_2\)) with silica (SiO\(_2\)) and water (H\(_2\)O) to form calcium silicate hydrate (C-S-H), which is the primary binder in cementitious reactions. The correct reaction is: \[ \text{Ca(OH)}_2 + \text{SiO}_2 + \text{H}_2\text{O} \rightarrow \text{C-S-H}. \] Therefore, the correct equation is option (B), where reactive silicon dioxide reacts with calcium hydroxide to form C-S-H, contributing to the strength of the cement. Final Answer: (B) Ca(OH)\(_2\) + Reactive Silicon dioxide + H\(_2\)O \(\rightarrow\) C-S-H.
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