- 2068 Baisakh · 2 marks
Efflorescence test for bricks
Short answer
The brick is placed upright in 25 mm of distilled water. After water is absorbed and evaporated, more water is added and evaporated again, then the brick is examined for white salt deposits, rated nil, slight, moderate, heavy, or serious.
Describe briefly the test for efflorescence for bricks.
The brick is placed on end in a shallow dish containing about 25 mm of distilled water, in a well ventilated room. After all water is absorbed and evaporated, the same quantity of water is added again and allowed to evaporate. The brick is then checked for white salt deposits.
Rating: nil (no deposit), slight (up to 10% of surface covered), moderate (10-50%), heavy (more than 50% with no powdering) and serious (powdering and flaking). A good brick should show not more than slight efflorescence.
✓ Answer checked by Claude Opus 5.5 (high effort)
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