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UPSC Civil Service Exam Questions - Engineering

Q1:

Surkhi is added to lime mortar to

A prevent shrinkage

B decrease setting time

C increase bulk

D impart hydraulicity.

ANS:A - prevent shrinkage

Sand is used to prevent shrinkage.

If Surkhi is also having the same property the. There is no purpose of adding surkhi in mortar.

The property which makes is different from sand is it's hydraulicity (affection towards water to make a proper mortar mix).