# Introduction of Compressive strength of concrete block in N/mm2 and Kg/cm2

Strength is a crucial factor in the construction industry, as it directly affects the durability and integrity of a structure. When it comes to concrete, its compressive strength is of utmost importance. This measures the ability of a material to withstand pressure and resist breaking under a compressive load. In the world of concrete blocks, the compressive strength is often expressed in two units: Newton per square millimeter (N/mm2) and Kilogram per square centimeter (Kg/cm2). In this article, we will delve into the introduction of compressive strength of concrete block in these two units, exploring its significance and how it is determined.

## What is the compressive strength of concrete block in N/mm2 and Kg/cm2

Compressive strength is a measure of the ability of a material to withstand a compressive force without breaking or failing. In the construction industry, compressive strength is an important property for various building materials, such as concrete, bricks, and blocks. It is a critical factor in determining the structural integrity and safety of a building.

In this article, we will focus on the compressive strength of concrete blocks, also known as concrete masonry units (CMU). Concrete blocks are commonly used in construction for building walls, retaining walls, and foundations. They are made from a mixture of cement, sand, water, and aggregates, such as gravel or crushed stone. Concrete blocks come in various sizes and shapes, and their strength can vary depending on their composition, production process, and curing time.

The compressive strength of concrete blocks is typically measured in two units: Newtons per square millimeter (N/mm2) and kilograms per square centimeter (Kg/cm2). N/mm2 is the metric unit used in most countries, while Kg/cm2 is commonly used in Japan and a few other countries.

The compressive strength of concrete blocks can range from 3.5 N/mm2 (500 Kg/cm2) to 40 N/mm2 (4500 Kg/cm2). The exact strength will depend on the type of block, its composition, and the testing methods used. Different grades of concrete blocks, such as lightweight blocks, medium-weight blocks, and heavyweight blocks, have different compressive strength values. The type of cement, its ratio with other materials, and the curing time also have a significant impact on the strength of concrete blocks.

Generally, the higher the compressive strength of a concrete block, the better its performance and durability. The strength of concrete blocks is crucial in bearing loads from the weight of the building and any external forces, such as earthquakes or wind. It is also essential in resisting water penetration and providing insulation.

To determine the compressive strength of concrete blocks, lab tests are conducted using specialized equipment, such as a compression machine. During the test, the block is placed between two steel plates and subjected to a gradually increasing compressive force until it fails. The maximum force that the block can withstand without breaking is then recorded as its compressive strength.

In conclusion, the compressive strength of concrete blocks is an important property that affects the safety and longevity of a building. The strength of concrete blocks is measured in N/mm2 or Kg/cm2 and can vary depending on the type of block, its composition, and curing time. It is essential to test the compressive strength of concrete blocks to ensure their suitability for construction purposes.

## Conclusion

In conclusion, the introduction of compressive strength as a measure of the strength of concrete blocks in both N/mm2 and kg/cm2 has greatly improved the accuracy and reliability of testing and analyzing concrete blocks. This standardized unit of measurement allows for more precise comparisons and calculations, making it easier to determine the strength of a block and ensure the safety of structures built with them. By understanding the importance of compressive strength and the conversion between N/mm2 and kg/cm2, engineers, builders, and contractors can ensure the durability and stability of their construction projects. As technology continues to advance and new methods of testing and measuring emerge, it is important to continue utilizing and understanding the compressive strength of concrete blocks as a crucial factor in the construction industry.