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An advantage of fibre wrapping over concrete jacketing is that it

  • A.needs no protection against fire or against ultraviolet exposure in service
  • B.adds almost no mass or section
  • C.requires no preparation of the surface of the existing member before application
  • D.provides a great deal of additional flexural strength to the member being wrapped

Answer: B

The wrap is a few millimetres thick, so the column dimensions and the building's mass are essentially unchanged and the work is quick. Fire protection and surface preparation are both real requirements and add to the cost.

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