Civil Engineering - Building Materials - Discussion

Option C is wrong according to G Das pg.no.180.

Yeah C is wrong. Pozzalana has high shrink than OPC.

Pozzolana reduce bleeding but increase shirnkage.

* Portland Pozzolona cement contain 20-30% of pozzolanic materials.
* Pozzolana is non-cementitious material themselves but they react with calcium hydroxide in presence of water at ordinary temperature and form compound that posses cementitious property.
* Pozzolana cement is produced either by grinding together portland cement clinker and pozzolana or by intimately or uniformly bleeding portland cement with pozzolana.

ADVANTAGES
* Higher resistance to chemical attack.
* lower heat of hydration.
* lower shrinkage on drying.
* Water Tightness.
* It has the higher ultimate strength.

DISADVANTAGE
* As compared to OPC it attains strength slowly.
* it needs a framework to be kept for longer periods.

Excellent, thanks @Rabindra.

Yes, Option C is not correct.