Customer Questions

What is the setting time for OPC?

The initial setting time for OPC is approximately 30-60 minutes, while the final setting time can extend up to 600 minutes depending on the specific formulation and environmental conditions.

What is the shelf life of National OPC?

The shelf life of National OPC is typically up to six months if stored properly in a dry environment. It is crucial to keep the cement away from moisture to maintain its quality and effectiveness in construction projects.

What are the mixing requirements for National OPC?

When using National OPC, it can be mixed with aggregates like sand and gravel to create concrete or with other materials for specific applications such as grouting. Proper mixing ratios are essential to achieve desired strength and workability.

What applications is National OPC suitable for?

National OPC is versatile and can be used in various construction applications, including residential buildings, commercial structures, infrastructure projects, and precast concrete products. Its durability makes it ideal for both indoor and outdoor ...

How is National OPC packaged?

National OPC is typically available in 50 kg bags, making it convenient for transportation and handling on construction sites. This packaging size is standard in the industry for easy use.

What are the standard compliance certifications for National OPC?

National OPC complies with international standards such as ASTM C150 and EN 197-1. These certifications ensure that the cement meets rigorous quality and performance requirements.

What is the strength class of National OPC?

National OPC is classified as 42.5 R Strength Class, indicating that it achieves a minimum compressive strength of 42.5 MPa after 28 days of curing. This makes it suitable for both general and high-strength concrete applications.

What are the key characteristics of National OPC?

National OPC is known for its high compressive strength, excellent workability, and consistent quality. It typically has a quick setting time and superior durability, making it suitable for a wide range of construction applications.

What is Ordinary Portland Cement (OPC)?

Ordinary Portland Cement (OPC) is a type of cement commonly used in construction, recognized for its strength and durability. It serves as a primary ingredient in concrete, mortar, and stucco, making it essential for various construction projects.

What are the physical properties of OPC?

Key physical properties of OPC include a specific gravity of around 3.12, normal consistency of about 29%, and fineness ranging from 225 to 370 m²/kg depending on the grade. These properties influence its performance in construction applications.

How should OPC be stored?

OPC should be stored in a dry, weather-tight building to protect it from moisture and deterioration. Proper storage conditions ensure the quality and performance of the cement are maintained until use.

What are the typical applications of OPC?

OPC is used in a variety of construction applications including general concrete work, masonry, plastering, and precast concrete products. It is particularly effective in structures that do not encounter sulfate exposure.

How is OPC manufactured?

The manufacturing process of OPC involves crushing and grinding raw materials like limestone and clay, followed by heating them in a kiln to form clinker. This clinker is then ground with gypsum to produce the final cement product.

What is the compressive strength of 53-grade OPC?

The minimum compressive strength of 53 grade OPC is 53 MPa at 28 days. This makes it ideal for precast structures and high-strength applications like bridges and tall buildings.

What are the grades of OPC available?

OPC is categorized into different grades based on compressive strength, primarily 33, 43, and 53 grades. The 53 grade OPC is used for high-strength concrete applications, while the 43 grade is suitable for general construction.

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