PPC Cement
PPC - Portland Pozzolona Cement
PPC is obtained by adding pozzolonic materials like flyash, pumicites, volcanic ashes, shales, tuffs, etc.
Portland Pozzolana Cement (PPC) is obtained by either intergrinding a pozzolanic material with clinker and gypsum, or by blending ground pozzolana with Portland cement.
Nowadays good quality fly ash is available from Thermal Power Plants, which are processed and used in manufacturing of PPC.
Some people have presumption that since PPC uses a waste product as an ingredient, it makes it less good than the good old OPC. However, on the other hand PPC has certain distinct advantages over OPC, as listed below:
Low heat of hydration reducing chances of surface cracks
Longer setting time making it more workable than OPC
Ultimate strength higher than OPC
Lower porosity imparting the concrete more water tightness
Lower manufacturing cost compared to OPC
Waste utilization making it more environmental friendly.