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Composition of Ordinary Portland Cement

By: Haseeb Jamal / On: Oct 16, 2017 / Cements, Shallow
Composition
 
 

Composition of Ordinary Portland Cement

The chief chemical components of ordinary Portland cement are:

  1. Calcium
  2. Silica
  3. Alumina
  4. Iron

Calcium is usually derived from limestone, marl or chalk while silica, alumina and iron come from the sands, clays & iron ores. Other raw materials may include shale, shells and industrial byproducts.

Basic Composition:

Contents
%
CaO
60-67
SiO2
17-25
Al2O3
3-8
Fe2O3
0.5-6.0
MgO
0.5-4.0
Alkalis
0.3-1.2
SO3
2.0-3.5

The chief compound which usually form in process of mixing:

  • 1-triclcium silicate (3CaO.SiO2)
  • 2-Dicalcium silicate (2CaO.SiO2)
  • 3-tricalcium aluminates (3CaO.Al2O3)
  • 4-tetracalcium aluminoferrite (4CaO.Al2O3.Fe2O3)
 

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