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The critical detail in a concrete jacket to a column is

  • A.the strength of the new concrete being lower than that of the existing column
  • B.leaving the new reinforcement unconnected to the existing column reinforcement
  • C.continuity of the new bars through the floor slabs
  • D.the colour and finish of the new concrete against the existing surface

Answer: C

A jacket that stops at each floor adds confinement but no flexural capacity, because its longitudinal steel cannot develop force across the joint. Coring through the slab to pass the bars is laborious and is where the cost of the method lies.

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