Ordinary Portland Cement -Definition, Composition, Uses

ordinary portland cement

Ordinary Portland Cement (OPC)

  • It is one of the most widely used types of Portland cement.
  • The name Portland Cement was named by Joseph Aspdin in 1824 due to its similarity in color and its quality when it hardens like Portland stone.
  • Portland Cement is a fine powder that when mixed with water becomes the binding material that holds aggregates together in concrete.
  • This cement is composed of white-grey limestone found on the island of Portland, Dorset
  • Portland Cement is caustic in nature, so it can cause chemical burns.


Composition Of Ordinary Portland Cement

Content Percent(%)
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


Uses of Ordinary Portland Cement (OPC)

  • OPC is generally used for the reinforced concrete buildings, bridges, pavements, and where soil conditions are normal.
  • Ordinary Portland Cement is used for general construction purposes where special properties are not required.
  • This cement has great resistance to cracking and shrinkage but less resistance to chemical attacks.
  • This cement is also used for most of the concrete masonry units.


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