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PPC

PPC or  Portland Pozzolana Cement is a kind of Blended Cement which is produced by grinding the Portland clinker with gypsum and pozzolanic materials in measured proportions or by blending Ordinary Portland Cement (OPC), with Pozzolanic materials in certain proportions.

Pozzolana is any natural or artificial material containing silica in a reactive form. The pozzolana  is in a finely divided state to allowsilica to combine with calcium hydroxide (liberated by the hydrating Portland cement) in the presence of water forming stable Calcium Silicates Hydrate that have the cementitious properties. The pozzolanic materials commonly used are

  • Calcined clay
  • Fly ash
  • Silica fumes

The Indian standards for Portland Pozzolana Cement have been issued in two parts based on the type of pozzolanic materials to be used in manufacturing of Portland Pozzolana Cement as given below:

  • IS 1489 (Part 1) 1991, Portland Pozzolana Cement – specification (fly ash based)
  • IS 1489 (Part 2) 1991, Portland Pozzolana Cement – specification (Calcined clay based) the quality of flyash or calcined clay to be used in manufacturing of PPC is also specified by BIS in the following standards:
  • IS 3812 1981 – specification for flyash as pozzolana and admixture IS 1344 1981 – specification for calcined clay pozzolana.

In view of the availability of good quality fly ash in abundant quantity, the use of calcined clay based pozzolana cement is progressively decreasing.

 

Pozzolona & Pozzolonic cement

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