Cement

 Types of cement grades

There are different grades of cement, which are specified by IS 1489: 1991 as below of cement grade list.

  1.  OPC 33 Grade Cement
  2.  OPC 43 Grade Cement
  3.  OPC 53 Grade Cement

OPC (Ordinary Portland Cement) 33 Grade Cement

  • The Cement, which has Compressive strength of 33 N/ mm2 after the 28 days when tested, is known as 33-Grade Cement.
  • Fineness (specific area) of 33 Grade Cement = 300 m2/kg
  • 3 days compressive strength = 16 N/mm2
  • 7 days compressive strength = 22 N/mm2
  • 28 days compressive strength = 33 N/mm2

Properties of 33-Grade Cement 

  • This grade of cement has high workability and is mainly used for masonry work and for plastering work. 
  • The initial strength of 33 Grade Cement continues to gain even after 28 days.
  • The heat of hydration of 33 Grade Cement is lower as compared to the 43 grade and 53-grade cement.

Uses of 33-Grade Cement

  • It is widely used in plastering work.
  • It is also used for the brickwork of walls.
  • In the tiling work.
  • It is generally used for work, which required low compressive strength of below M20. 

The Code of reference for 33-grade cement is IS Code – IS 269: 1989.

OPC (Ordinary Portland Cement) 43 Grade Cement

  • The Cement, which has Compressive strength of 43 N/ mm2 after the 28 days when tested, is known as 43-Grade Cement.
  • Fineness (specific area) of 43 Grade Cement = 225 m2/kg
  • 3 days compressive strength = 23 N/mm2
  • 7 days compressive strength = 33 N/mm2
  • 28 days compressive strength = 43 N/mm2

Properties of 43-Grade Cement

  • It has low chloride content, so it doesn’t cause corrosion of steel reinforcement. 
  • It gives good workability of concrete. 
  • The initial strength of 43 Grade Cement continues to gain even after 28 days. 
  • The heat of hydration of 43 Grade Cement is medium. 
  • This will give a better surface finish to the structures.
  • It is moderately sulfate resisting.

Uses of 43 Grade Cement

  • It is used in the preparation of Ready Mix Concrete (RMC).
  • It is used for PCC and RCC work.
  • It is used in the construction of RCC bridges. 
  • For Construction of Silos and Chimneys. 
  • It is used for finishing of all types of structures like buildings, bridges, roads, and water retaining structures.
  • It is used in precast and prestressed concrete.
  • It is also used in Ship form Construction.
  • It is used in the construction where a grade of concrete up to M30.

The Code of reference for 43-Grade Cement is IS Code – IS 8112: 1989.

OPC (Ordinary Portland Cement) 53 Grade Cement

  • The Cement, which has Compressive strength of 53 N/ mm2 after the 28 days when tested, is known as 53-Grade Cement.
  • Fineness (specific area) of 53 Grade Cement = 225 m2/kg
  • 3 days compressive strength = 27 N/mm2
  • 7 days compressive strength = 37 N/mm2
  • 28 days compressive strength = 53 N/mm2

Properties of 53 Grade Cement

  • It is a Sulphate resisting cement.
  • It has low chloride content.
  • It can be used in speedy Construction.
  • It saves shuttering cost due to early removal. 
  • The initial strength of 53 Grade Cement continues to gain even after 28 days.

Uses of 53 Grade Cement

  • It is used the construction of concrete sleepers for Railways.
  • It is used in pre-stressed girders.
  • The 53-Grade Cement achieves early strength. 
  • It is used in industrial buildings roads and runways. 
  • It is used in the construction of RCC bridges and precast concrete. 
  • Generally used for M25 and above concretes.
  • It is used in the construction of all RCC components like a beam, columns, footings, and slabs.

The Code of reference for 53-Grade Cement is IS Code – IS 12269: 1987.

Also Read: What is Green Concrete? Advantages | Disadvantages | Properties

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