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OPC Cement (Ordinary Portland Cement) is the most common and widely used type of cement used for general construction works. It is usually gray in color. It consists of 95% clinker, 3 to 5 % gypsum by weight, and around 5% other additives which gives unique properties to OPC like quick setting time, better strength, etc.
PPC Cement (Pozzolana Portland Cement) is a variant of OPC which contains flyash and pozzolana in addition to clinker and gypsum. It has better workability, higher water retention capacity, lower heat of hydration, more uniform setting time and better finish quality when compared to OPC. PPC is generally used in areas with higher sulfate content in soil and water.