Class A engineering bricks are high-strength, low-absorption bricks specifically manufactured for demanding construction applications where durability and resistance to environmental factors are crucial. They are defined by their superior technical properties compared to standard bricks.
Here's a breakdown of their key characteristics:
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High Compressive Strength: This is the most defining characteristic. Class A engineering bricks boast a compressive strength greater than 125 N/mm² (Newtons per square millimeter). This allows them to withstand significant loads and stresses.
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Low Water Absorption: Another crucial property is their low water absorption rate. Class A engineering bricks must have a water absorption rate of less than 4.5%. This minimizes the risk of frost damage, efflorescence (salt deposits), and deterioration from exposure to moisture.
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Durability and Resistance: The combination of high strength and low water absorption makes these bricks highly durable and resistant to various environmental factors, including frost, chemicals, and abrasion.
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Manufacturing Process: Engineering bricks are typically manufactured at higher temperatures than common bricks, which contributes to their superior properties.
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Typical Applications: Due to their robust nature, Class A engineering bricks are used in:
- Retaining walls: Withstanding earth pressure.
- Foundations: Supporting building loads.
- Damp-proof courses (DPC): Preventing moisture from rising through walls.
- Sewers and drainage works: Resisting water and chemical damage.
- Other applications requiring high strength and durability.
While Class A bricks are the superior option, Class B engineering bricks are also available, offering slightly lower specifications (compressive strength greater than 75N/mm² and water absorption less than 7%). The choice between Class A and Class B depends on the specific requirements of the construction project.
| Property | Class A Engineering Brick | Class B Engineering Brick |
|---|---|---|
| Compressive Strength | > 125 N/mm² | > 75 N/mm² |
| Water Absorption | < 4.5% | < 7% |
