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Recent content by aymanb

  1. aymanb

    Passing concrete cylinders but failing cores

    Did that...followed ASTM to a T
  2. aymanb

    Passing concrete cylinders but failing cores

    The mix is as follows: Mix proportions per cubic yard Cement 375 lbs Water (batched) 30.1 gal Fine Aggregate 1160 lbs Coarse Aggregate #57 1210 lbs Coarse Aggregate #8 645 lbs Admixture (BASF/Glenium 7500 - High Range) 85 fl oz Slag 525 ibs Silica Fume 50 lbs Chloride Ion 0.11% by wt...
  3. aymanb

    Passing concrete cylinders but failing cores

    Thanks Ron will do.
  4. aymanb

    Passing concrete cylinders but failing cores

    The specified strength is 12,000 psi at 56 days. Specs require sampling every 100 CY. Weather conditions were perfect, dry with a temparature arround 70% F. No moist or other type of curing was done. The concrete was placed in a foundation wall 18 inches thick. You point out a potential...
  5. aymanb

    Passing concrete cylinders but failing cores

    I have high strength concrete cylinders that broke fine at 56 days yet cores taken of the same concrete came in below 85%, as low as 56% of specified strength. ASTM procedures were followed across the board during coring. Temperature has been mild since placement (within a range of 65 to 80...
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