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Q: Which of the following is/are deleterious material in aggregate?
  • A. Coal
  • B. Clay lumps
  • C. Soft fragments
  • D. All option are correct
Correct Answer: Option D - Deleterious materials of aggregates are – clay lumps, shale, soft, fragment or laminated particles, vegetable matters etc. They affect the quality of concrete.
D. Deleterious materials of aggregates are – clay lumps, shale, soft, fragment or laminated particles, vegetable matters etc. They affect the quality of concrete.

Explanations:

Deleterious materials of aggregates are – clay lumps, shale, soft, fragment or laminated particles, vegetable matters etc. They affect the quality of concrete.