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What is OPC Cement?

Ordinary Portland cement (OPC) is the most commonly used cement for a wide range of applications. It ranges from RCC, and masonry to plastering, precast, and prestress works. This cement is used in the production of ordinary, standard, and high-strength concrete, mortars, general-purpose ready-mixes, and dry lean mixes.

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Types of OPC Cement

UltraTech OPC cement is a basic type of cement. Ordinary Portland Cement is further classified into four grades based on its cube compressive strength at 28 days: 33, 43, 53, and 53-S.
 

  • OPC 33: When the 28-day cube compressive strength is greater than 33N/mm2, the cement is referred to as 33 grade OPC cement.

  • OPC 43: At 28 days, the cube compressive strength of this cement will be at least 43 N/mm2. It is primarily used in normal grade concrete and masonry applications.

  • OPC 53: At 28 days, the cube compressive strength of this cement will be at least 53 N/mm2. It is used in high-grade and high-performance structural applications such as reinforced cement concrete, prestressed concrete, high-speed constructions like slipform work, and precast applications. It is not recommended for use in mass concrete, non-
  • OPC53-S: It is a special grade OPC designed specifically for prestressed concrete railway sleepers only.

What is the difference between 43 and 53 OPC cement grades?

43 and 53 cement grades show the highest strength attained after 28 days. These are the two Ordinary Portland Cement grades that are most commonly used.

The differences between them are as follows:

 

  • After 28 days, grade 53 cement attains a strength of 530kg/sq cm, while grade 43 cement attains a strength of 430kg/sq cm.
  • Grade 53 cement is used in high-speed construction projects such as bridges, roadways, multistory structures, and cold weather concrete. The most commonly used general purpose cement is grade 43 cement.
  • Grade 53 cement has a quick setting time and develops strength rapidly. After 28 days, the strength does not significantly rise. Although it starts off with low initial strength, grade 43 cement eventually develops good strength.
  • While grade 43 cement produces relatively little hydration heat, grade 53 cement sets quickly and releases a significant amount. As a result, grade 53 Cement may have micro cracks that are not evident on the surface, and adequate curing should be done.
  • Grade 53 cement is slightly more expensive than grade 43.
     
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Uses of OPC cement

OPC is the most widely used cement in the world. Because of its low production costs, it is a popular cement in the construction business.

It is commonly used in:

Construction of high-rise structures

Ordinary Portland cement (OPC) is the most commonly used cement for a wide range of applications. Use UltraTech OPC for durable and long-lasting building foundations.
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Construction of roadways, dams, bridges, and flyovers

Ordinary Portland cement (OPC) is the most commonly used cement for a wide range of applications. Use UltraTech OPC for durable and long-lasting building foundations.
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Making grouts and mortars

Ordinary Portland cement (OPC) is the most commonly used cement for a wide range of applications. Use UltraTech OPC for durable and long-lasting building foundations.
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Building residential and industrial complexes

Ordinary Portland cement (OPC) is the most commonly used cement for a wide range of applications. Use UltraTech OPC for durable and long-lasting building foundations.
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Conclusion

Because the pozzolanic material reacts with the calcium hydroxide liberated by the hydrating Portland cement to form cementitious compounds, PPC increases the impermeability and density of the concrete. It can be used with confidence in the construction of hydraulic structures, marine works, mass concreting, and so on. It protects concrete against alkali-aggregate reactions.

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