Saturday, 6 April 2019

Chemical Composition Of Cement


Ordinary cement contains two basic ingredients , namely argillaceous and calcareous. In argillaceous materials, clay predominates and in calcareous calcium carbonates predominates.

Broadly the raw materials used for the manufacture of cement consist mainly of lime, silica, alumina and iron oxide. These oxides interact with one another at high temperature and form more complex compounds. The relative proportions of these oxide compounds are responsible for influencing the various  properties of cement, in addition to rate of cooling and fineness of grinding.
  
Approximately oxide composition range for ordinary Portland cement (OPC)are :

Ingredient
Chemical formula
Range(%)
Lime
CaO
62 - 67
Silica
SiO2
17 - 25
Alumina
Al2O3
3 - 8
Carbon Sulphate
CaSO4
3 - 4
Iron Oxide
Fe2O3
3 - 4
Magnesia
MgO
1 - 3
Sulphur
S
1 - 3
Alkalies
-
0.2 - 1


Post By: Dipali Pounikar (Civil Engineer)


No comments:

Post a Comment