Select the correct statements related to the characteristics of good clay bricks.
1. Crushing strength should be greater than 10 N/mm2.
2. When the brick is kept immersed in water for 24 hours, water absorption should not exceed
20% of its dry weight.
3. Brick earth should contain stones and saltpeter.
Statement 1 is correct: For a good quality (first-class) brick, the crushing or compressive
strength should not be less than 10 N/mm².
Statement 2 is correct: A good quality brick should not absorb more than 20% of its dry weight
when immersed in water for 24 hours.
Statement 3 is incorrect: Brick earth should be entirely free from stones, pebbles, kankar,
organic matter, and saltpeter. The presence of saltpeter causes efflorescence, while stones
weaken the structural homogeneity of the brick.
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