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Q: Surkhi is added to lime mortar to
  • A. Prevent shrinkage
  • B. Decrease setting time
  • C. Increase bulk
  • D. Impart hydraulicity
Correct Answer: Option D - Surkhi is broken brick powder or burnt clay soil and used as a substitute for sound for concrete and mortar, and has almost the same function as of sound but it also imparts some strength and hydraulicity.
D. Surkhi is broken brick powder or burnt clay soil and used as a substitute for sound for concrete and mortar, and has almost the same function as of sound but it also imparts some strength and hydraulicity.

Explanations:

Surkhi is broken brick powder or burnt clay soil and used as a substitute for sound for concrete and mortar, and has almost the same function as of sound but it also imparts some strength and hydraulicity.