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The Cement is manufactured by grinding quality clinker with flyash/Burntclay Pozzolona and gypsum in a open/closed circuit ball mill to a desired fineness (320-350 M2/kg) the alite (C3s) and belite C2s) phases are well developed and uniformly distributed in the clinker. High alite content brings early strength in cement while later strength of cement is achieved by the joint contribution of alite and belite phases. The Tricalcium aluminate phase (C3A) is well maintained in clinker to have sufficient effringite phase with Gypsum and is responsible for one day strength and also keeps the setting time control well units in the limits. The flyash addition (15-35%) is made according to clinker quality and flyash conforms the requirement of IS 3812-2003. Flyash addition makes the low heat cement and chloride as well as sulphate resistant cement. The leaching effect of lime Ca (OH)2 is also controlled by double action of Flyash and ultimate strength goes on increasing.
|Physical Properties||IS 8112-1989||Prime Gold Cement||IS 1489-1991||Prime Gold Cement||IS 455-1989||Prime Gold Cement|
|IST Not less than||30||80-120||30||80-120||30||80-120|
|FST Not more than||600||150-180||600||150-180||600||150-180|
|7 Days (Minimum)||33||35+||22||30+2||22||30+2|
|28 Days Minimum)||43||45+||33||40+2||33||40+2|
|Lechhatelier Not more than||10||2-3||10||2-3||10||0.05|
|Autoclave Not more than||0.8||0.05||0.8||0.05||0.8||0.05|
|Dry shrinkage(by weight)|
|Not more than||0.15||0.05-0.10||0.15||0.05-0.10||0.15||0.05-0.10|
|Chemical Properties||IS 8112-1989||Prime Gold Cement||IS 1489-1991||Prime Gold Cement||IS 455-1989||Prime Gold Cement|
|Loss on Ignition max(%)||5||3.0-3.5||5||3.0-3.5||5||3.0-3.5|
|Alkalies(% as Na2O)||—||0.5-0.8||—||0.5-0.8||—||0.5-0.58|
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