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Q: When the deposits of efflorescence is more than 10 percent but less than 50 percent of the exposed area of brick, the presence of efflorescence is classified as:
  • A. More
  • B. Slight
  • C. Moderate
  • D. Heavy
Correct Answer: Option C - Presence of Efflorescence is classified as IS.3495 as below- Nil- When the deposit of efflorescence is imperceptible. Slight- When the deposit of efflorescence does not cover more than 10% of the exposed area of the brick. Moderate- When the deposit of efflorescence is more than 10% but less than 50% of exposed area of the brick. Heavy- When the deposit of efflorescence is more then 50% but the deposits do not powder or flake away the brick surface.
C. Presence of Efflorescence is classified as IS.3495 as below- Nil- When the deposit of efflorescence is imperceptible. Slight- When the deposit of efflorescence does not cover more than 10% of the exposed area of the brick. Moderate- When the deposit of efflorescence is more than 10% but less than 50% of exposed area of the brick. Heavy- When the deposit of efflorescence is more then 50% but the deposits do not powder or flake away the brick surface.

Explanations:

Presence of Efflorescence is classified as IS.3495 as below- Nil- When the deposit of efflorescence is imperceptible. Slight- When the deposit of efflorescence does not cover more than 10% of the exposed area of the brick. Moderate- When the deposit of efflorescence is more than 10% but less than 50% of exposed area of the brick. Heavy- When the deposit of efflorescence is more then 50% but the deposits do not powder or flake away the brick surface.