Written by Portland-pozzolana cement is portland cement to which pozzolana has been added, in the amount of about 20%, to reduce the liability of leaching.
Pozzolana is an important ingredient in PPC which is commonly used in the form of:
PPC is resistant to harsh water attacks and prevents the formation of calcium hydroxide at the time of cement setting and hydration. It withstands aggressive gases, thermal cracks, wet cracking, etc. The BIS quality specifications for Pozzolana materials used in PPC have been mentioned below:
- Fly ash – IS 3812:1981
- Calcined clay – IS 1344:1981
