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Hydraulic lime differs from Portland cement in that it

  • A.sets far more quickly and gives a much greater strength
  • B.requires no water at all in order for it to set properly
  • C.is burnt at a considerably higher kiln temperature
  • D.sets more slowly and gives a weaker, more flexible mortar

Answer: D

Its lower strength and greater capacity to accommodate movement make it the material of choice for repairing historic masonry. A Portland cement mortar in such a wall is generally too strong and drives damage into the stone.

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