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Ordinary Portland Cement (OPC)

Ordinary Portland Cement (OPC) is the most commonly used cement worldwide, known for its high strength and versatility. It is made from a combination of limestone, clay, and other materials, which are heated and ground into a fine powder. OPC is available in three grades: 33, 43, and 53, indicating their compressive strength.

Product Specification

Compressive Strength:

  • At 3 days: 16 MPa (minimum)
  • At 7 days: 22 MPa (minimum)
  • At 28 days: 33 MPa (minimum)

Fineness:

  • The fineness of OPC is typically around 225-350 m²/kg (Blaine fineness).

Setting Time:

  • Initial Setting Time: Minimum 30 minutes
  • Final Setting Time: Maximum 600 minutes

Soundness:

  • The soundness of OPC should not exceed 10 mm (as per the Le Chatelier method).

Chemical Composition:

  • Lime (CaO): 60-67%
  • Silica (SiO2): 20-25%
  • Alumina (Al2O3): 4-8%
  • Iron Oxide (Fe2O3): 3-6%
  • Magnesia (MgO):
  • Maximum 5%

Heat of Hydration:

  • OPC releases heat faster than PPC (Portland Pozzolana Cement) during hydration, making it suitable for quick construction projects where high early strength is desired.

Benefits:

  • High early strength, making it ideal for rapid construction.
  • Suitable for general construction, including buildings, pavements, and roads.
  • Widely used for reinforced concrete, precast concrete, and structural work.
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