Chemical Composition of cement

20th October 2016 0 By Malay Sautya

Chemical Composition of Cement

The raw materials used for the manufacture of cement consist mainly of lime, silica, alumina and iron oxide. These oxides interact with one another in the kiln at high temperature to form more complex compounds.  

Approximate Oxide Composition Limits of Ordinary Portland Cement

Oxide Content   Percentage
Cao 60 – 67
SiO2                           17 – 25        
Al2o3 3.0 – 8.0    
Fe2o3   0.5 – 6.0
MgO 0.1–4.0
Alkalies (K2O, Na2O) 0.4 – 1.0
SO3 1.3 – 3.0

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Bogue’s Compounds