Pozzolanic materials react with which component of cement paste to form additional cementitious compounds?
- ACalcium silicates
- BCalcium hydroxideCorrect
- CTricalcium aluminate
- DTetracalcium aluminoferrite
Solution
Concept
Pozzolanic reaction
Formula
Ca(OH)₂ + SiO₂ → C–S–H
Step-by-step solution
1. Pozzolanas combine with calcium hydroxide released in cement hydration. 2. They form additional C–S–H.
Explanation
The reaction consumes lime and gives extra cementitious gel, improving durability.
Why the other options are wrong
The other compounds are not the reaction partner.
Shortcut
Pozzolana + Ca(OH)₂ → C–S–H.
Correct answer: B) Calcium hydroxide