Strength Based Classification of Bricks

IS: 3102 is the Indian Standard code for the classification of burnt clay solid bricks based on their compressive strength. The strength-based classification of bricks is done to ensure the quality of bricks used in construction. The compressive strength of bricks is an important parameter to determine the quality of bricks. The strength-based classification of bricks is done on the basis of the following factors:

Factors for strength based classification of bricks

1. Compressive strength: The compressive strength of bricks is determined by applying a compressive load on a brick until it fails. The compressive strength of bricks is expressed in N/mm2 or MPa.

2. Water absorption: The water absorption of bricks is determined by immersing a brick in water for 24 hours and then weighing it. The water absorption of bricks is expressed as a percentage of the dry weight of the brick.

3. Efflorescence: Efflorescence is the white salt deposits that form on the surface of bricks due to the presence of soluble salts. The efflorescence of bricks is determined by placing a brick in a tray and adding water to the tray. The water is then allowed to evaporate and the amount of salt deposits on the surface of the brick is measured.

4. Dimensional tolerance: The dimensional tolerance of bricks is measured by checking the length, width, and height of the bricks. The dimensional tolerance of bricks is expressed as a percentage of the specified size of the brick.

5. Warpage: Warpage is the deviation of the brick from a straight line. The warpage of bricks is determined by placing a straight edge on the surface of the brick and measuring the deviation.

Classification of Bricks

Based on the compressive strength of bricks, they are classified into the following categories:

1. Class A: These are the highest quality bricks with a compressive strength of more than 100 N/mm2.

2. Class B: These are medium quality bricks with a compressive strength between 70 N/mm2 and 100 N/mm2.

3. Class C: These are low-quality bricks with a compressive strength between 35 N/mm2 and 70 N/mm2.

4. Class D: These are the lowest quality bricks with a compressive strength of less than 35 N/mm2.

Conclusion

Thus, the strength-based classification of bricks is an important factor in determining the quality of bricks used in construction. The compressive strength of bricks is an important parameter in this classification, and it is determined by applying a compressive load on a brick until it fails. Based on the compressive strength, bricks are classified into different categories, and the quality of bricks is ensured by checking various parameters like water absorption, efflorescence, dimensional tolerance, and warpage.