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Assertion (A): A shrinkage-compensating concrete must be reinforced to work as intended.
Reason (R): The reinforcement restrains the early expansion and puts the concrete into compression.

  • A.A is true but R is false
  • B.A is false but R is true
  • C.Both A and R are true, and R is the correct explanation of A
  • D.Both A and R are true, but R is not the correct explanation of A

Answer: C

Both are true and the reason gives the mechanism: unrestrained expansion simply makes the member larger, whereas restrained expansion stores a compressive stress that later shrinkage has to overcome before cracking can begin.

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