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The minimum grade of concrete IS 13920 permits in a building up to 15 m tall in Zones III to V is

  • A.M30
  • B.M10
  • C.M20
  • D.M15

Answer: C

Below M20 the concrete cannot be relied on to confine reliably or to develop bond over the anchorage lengths the standard assumes. Taller buildings in those zones are required to use M25 or better, because the axial stresses and the confinement demands both rise.

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