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CEMENT INDUSTRY

    Fly ash is an  pozzolanic material  and is being used as an additive to cement by several countries.Generally,Indian fly ashes are suitable for manufacturing of Portland Pozzolana Cement.

Portland Pozzolana Cement.

The optimum quantity of fly ash to be added to manufacture of P Portland Pozzolana Cement shall depend upon following factors:
                                            composition of clinkers and pozzolana
                                            quantity of gypsum added
                                            fineness and reactivity of clinker and pozzolana as well
       Some of the major advantages of PPC are: -
        1 Low heat of  hydration
        2 Good long term strength
        3 Increased  workability
        4 Resistance to chemical and aggressive environment attack
        5 Reduced alkali-aggregate reaction
        6 Reduced chloride diffusivity
        7 Reduced   permeability
        8 Improved durability
        9 Reduced rate of bleeding
        10 Increased water retentively
        11 Reduced shrinkage
      Area of application of PPC
        All construction for plain cement and reinforced cement concrete
        All marine concrete structures such as docks, jetties, harbours,bridge piers etc.
        Mass concrete structures such as Dams, where much heat of hydration emolument is anticipated.
        Heavy foundation work in salt infested soils

Pozzolana Metallurgical Cement

      This cement consists of blend of Ordinary Portland Cement,Fly ash and slag and is also popularly Known as Sulphate resisting cement.This cement is used for construction of marine structures and foundations over  sulphate infested soils.

Masonry Cement

Here fly ash is blended with ordinary portland cement of low grade (usually 33 grade cement)
such that the cement is used only for carring out Masonry works.


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