Portland Pozzolana Cement (PPC)
PPC is a type of blended cement. It consists of 15-35% pozzolanic material, 4% gypsum and the rest is clinker. PPC as per BIS code is equivalent to that of 33 grade. Since the pozzolanic material reacts with calcium hydroxide liberated by the hydrating Portland cement and forms cementatious compounds, PPC makes the concrete more impermeable and denser. It can be confidently employed in construction of hydraulic structures, marine works, mass concreting etc. It protects concrete against alkali-aggregate reaction.
Pozzolana is a natural or artificial material containing silica in a reactive form. Though it does not possess cementitious properties, it can chemically react with calcium hydroxide, when finely divided, at ordinary temperature to form compounds (calcium silicates) possessing cement properties.
Per BIS requirements, the minimum 28-day compressive strength should be minimum 33 MPa
It is suitable for use in common applications such as masonry mortars and plastering