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Compressive strength - concrete

  1. Mar 11, 2010 #1
    in compressive tests of concrete blocks in a lab, there must be maximum contact between the press and the concrete, i am told that if you place a piece of waxed paper between the press and the concrete, or even if one of the surfaces is slightly wet, your results will be very distorted and even the way the block crumbles will be different, producing cracks all the wal around the block parallel to the force applied,
    can anyone explain this phenomenon, i am told it has something to do with poissons ratio
  2. jcsd
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