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  1. massbridge

    In place density of 3/4 Crushed stone

    Thanks everybody!
  2. massbridge

    In place density of 3/4 Crushed stone

    Ron, I attached a photo of the 3/4" stone which was placed and compacted. There is approximately 2 feet of this stone. It is placed directly on rock. There is a 15' x 34' x 3' deep 4000 psi reinforced concrete footing over this. I am very comfortable with the integrety of the structure. Would...
  3. massbridge

    In place density of 3/4 Crushed stone

    The contractor took a sample and came up with a dry rodded unit weight. The inspector used the Nuclear Density gauge (on back scatter) to come up with a density reading. The spec calls for the stone to be compacted to 100% of the rodded value. I don't believe that you can compare a back...
  4. massbridge

    In place density of 3/4 Crushed stone

    We have compacted 3/4" crushed stone for a leveling course prior to concrete placement. The compaction was tested using a nuclear density machine. He used the "back scan" option. Doesn't that give you a direct reading of the in place density rather than a value to compare to the lab density...
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