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...
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...
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...
