Which is Stronger: a Brick or a Cement Block?

The enduring debate between bricks and cement blocks has been a subject of much discussion within the construction industry. Both materials have their own unique strengths and are widely used in various construction applications. However, when it comes to determining which one is stronger, the answer isn't straightforward. It largely depends on the specific context and the intended application of the construction project.

Overview of Bricks and Cement Blocks

Both conventional bricks and concrete bricks have long histories in the construction industry. Conventional bricks, typically made from clay and baked at high temperatures, have been used for centuries. These bricks are known for their excellent compressive strength and durability. Despite these qualities, they may not always be as strong as concrete bricks in certain applications.

Concrete bricks, on the other hand, are made from a mixture of cement, sand, and aggregate. These bricks are formed and cured, providing higher compressive strength compared to conventional bricks. They are frequently used in load-bearing structures due to their fire resistance and sound insulation properties. However, it's essential to understand that the strength of a brick is not solely determined by the material, but also by the manufacturing process and the intended application.

Strength Factors and Considerations

Several factors influence the strength of a brick, including the materials used, the manufacturing process, and the intended application. Construction professionals and civil engineers must carefully consider these factors when selecting the appropriate brick for a specific project. Understanding these factors can help in making an informed decision and choosing the right material for the job.

Comparison of Concrete Blocks and Bricks

Bricks are generally more popular than solid concrete blocks. Solid concrete blocks, or concrete masonry units (CMUs), are rare and have limited use. CMUs have a hollow interior, which makes them lighter and allows for the insertion of reinforcing steel and concrete. Reinforced CMUs are significantly stronger than bricks and solid concrete blocks, making them preferred for certain applications.

It's important to note that the term 'cement block' is a misnomer. There is no such thing as a 'cement block'. Instead, the term 'concrete block' is the correct one. Concrete blocks come in different widths and designs, some of which are solid, while others are hollow to allow infilling with rebar and concrete. The strength of a concrete block varies based on the specific type and design.

Strength Comparisons

The strength of a brick can be compared to that of a concrete block. While a solid 8-inch cement block (CMU) may not be as strong as a multi-layer solid brick structure due to its density, the hardness and strength of bricks and concrete blocks also depend on the specific type and design. The hardest available brick, known as a Class A Engineering Brick, can achieve a compressive strength of over 125 N/mm2. In contrast, the hardest concrete block, with a compressive strength of 20 N/mm2, remains significantly weaker.

Furthermore, there are concrete padstones available with a compressive strength of 50 N/mm2. While these can be used to build walls, they would be an extremely expensive and inefficient way of construction, and their strength still falls far short of that of a Class A Engineering Brick wall, which would offer a compressive strength of over 250 N/mm2.

Conclusion

In summary, while conventional bricks have stood the test of time and offer good durability, concrete bricks generally provide higher compressive strength and additional benefits such as fire resistance and sound insulation. Therefore, concrete bricks may be considered stronger in certain construction applications. Understanding the strengths of both materials can help construction professionals and civil engineers choose the most appropriate material for their projects.