Question

As per IS 3102 – 1965, for F1 class bricks, the percentage water absorption after 24 hour of immersion in cold water shall not exceed 
1. 20%
2. 12%
3. 25%
4. 5%

Answer 1

Correct Answer - Option 1 : 20%

The IS code 3102-1965 has been superseded by IS 1077-1992 and it is no longer available.

As per IS 1077-1992, bricks are classified as per their compressive strengths as follow

Brick class	Minimum Compressive strength (N/mm2)
3.5	3.5
5	5
7.5	7.5
10	10
12.5	12.5
15	15
17.5	17.5
20	20
25	25
30	30
35	35

 

As per IS 1077-1992, Cl 7.2, water absorption value after 24 hour of immersion in cold water shall not be more than 20% up to class 12.5 and 15 % by weight for higher classes.