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A rebound hammer test on existing concrete gives an indication of its

  • A.tensile strength measured directly on the face of the member
  • B.reinforcement layout and the depth of cover over the bars within it
  • C.chloride content and the likelihood of corrosion of its reinforcement
  • D.surface hardness

Answer: D

The rebound number correlates loosely with compressive strength but is affected by carbonation, moisture and the aggregate, so it is used for comparison between members rather than as an absolute measure. Cores are taken where a firm figure is needed.

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