what"s the different between OPC (ordinary portland cement)
and PPC (pozalana portland cement)?
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Answer Posted / deepthi ramachandran
The Portland Pozzolana Cement is a kind of Blended Cement
which is produced by either intergrinding of OPC clinker
along with gypsum and pozzolanic materials in certain
proportions or grinding the OPC clinker, gypsum and
Pozzolanic materials separately and thoroughly blending
them in certain proportions.
Pozzolana is a natural or artificial material containing
silica in a reactive form. It may be further discussed as
siliceous or siliceous and aluminous material which in
itself possesses little, or no cementitious properties but
will in finely divided form and in the presence of
moisture, chemically react with calcium hydroxide at
ordinary temperature to form compounds possessing
cementitious properties. It is essential that pozzolana be
in a finely divided state as it is only then that silica
can combine with calcium hydroxide (liberated by the
hydrating Portland Cement) in the presence of water to form
stable calcium silicates which have cementitious
properties. The pozzolanic materials commonly used
are:Volcanic ash, Calcined clay, Fly ash,silica fumes
OPC is environment friendly as well as economical
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