- 2081 Chaitra (new course) · 1 mark
Why pozzolana is used in PPC
Short answer
Pozzolana reacts with calcium hydroxide from cement hydration to form extra C-S-H gel, enhancing durability, sulphate resistance, and reducing heat of hydration. It also lowers permeability and cost while utilizing industrial waste.
Why is pozzolana used to make PPC (Portland Pozzolana Cement)?
Pozzolana (such as fly ash or calcined clay) is a siliceous material that, with moisture, reacts with the calcium hydroxide released by hydrating cement to form extra C-S-H gel. It is used in PPC to:
- improve durability and resistance to sulphates, chlorides and chemicals;
- reduce heat of hydration and cracking in mass concrete;
- give a denser, less permeable concrete and lower efflorescence;
- reduce cost and save clinker and energy (reducing CO2), and use industrial waste.
✓ Answer checked by Claude Opus 5.5 (high effort)
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