## Types of cement grades

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

- OPC 33 Grade Cement
- OPC 43 Grade Cement
- OPC 53 Grade Cement

^{OPC (Ordinary Portland Cement) 33 Grade Cement}

- The Cement, which has Compressive strength of 33 N/ mm
^{2}after the 28 days when tested, is known as 33-Grade Cement. - Fineness (specific area) of 33 Grade Cement = 300 m
^{2}/kg - 3 days compressive strength = 16 N/mm
^{2} - 7 days compressive strength = 22 N/mm
^{2} - 28 days compressive strength = 33 N/mm
^{2}

#### 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/ mm
^{2}after the 28 days when tested, is known as 43-Grade Cement. - Fineness (specific area) of 43 Grade Cement = 225 m
^{2}/kg - 3 days compressive strength = 23 N/mm
^{2} - 7 days compressive strength = 33 N/mm
^{2} - 28 days compressive strength = 43 N/mm
^{2}

#### 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/ mm
^{2}after the 28 days when tested, is known as 53-Grade Cement.

- Fineness (specific area) of 53 Grade Cement = 225 m
^{2}/kg - 3 days compressive strength = 27 N/mm
^{2} - 7 days compressive strength = 37 N/mm
^{2}

- 28 days compressive strength = 53 N/mm
^{2}

#### 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