The compressive strength of perforated bricks should not be less than ?

Based on standard building specifications and codes, the correct answer is that the compressive strength of perforated bricks should not be less than 7 Mn/M² (7 meganewtons per square meter).

Here’s a breakdown of why this is the case:

1. Perforated bricks are designed to be lighter than solid bricks while maintaining structural integrity.

2. Despite having holes, they need to withstand significant compressive forces in construction.

3. The 7 Mn/M² standard ensures that these bricks are strong enough for most building applications.

4. This minimum strength requirement helps maintain safety standards in construction.

5. Lower values (like 4, 5, or 6 Mn/M²) would generally be considered too weak for perforated bricks used in load-bearing structures.

It’s important to note that exact standards can vary slightly between different countries or regions, but 7 Mn/M² is a commonly accepted minimum for perforated bricks in many building codes.

Always consult local building codes and standards for the most accurate and up-to-date information for your specific area and project requirements.