Water absorption for burnt clay heavy duty bricks should not be more than :
- A10 percentCorrect
- B20 percent
- C5 percent
- D15 percent
Solution
Concept
Water absorption limit of heavy duty bricks (IS 2180)
Step-by-step solution
1. IS 2180 covers heavy duty burnt clay bricks used for foundations and heavy structures. 2. Their water absorption after 24 h immersion must not exceed 10% of dry mass.
Explanation
Heavy duty bricks must be dense and strong, so IS 2180 limits their water absorption to 10 percent (ordinary common bricks may absorb up to 20 percent).
Why the other options are wrong
20 percent is the limit for ordinary common bricks. 5 percent and 15 percent are not the specified limit for heavy duty bricks.
Shortcut
Common bricks: 20%. Heavy duty bricks: 10%.
Common mistake
Taking the common-brick limit of 20%.
Correct answer: A) 10 percent