7515325
Materials
- Nov 10, 2005
- 16
Just broks some 28 day breaks and all of them across the board fell from 12-20% from the 14day break. We are using good crushed stone from MO with wash sand Type I cement and 16% fly ash. Nothing special about the mix, looking for 750@ 28 days. All of the mix's had the strength at 14 days, but fell from grace after that. Human error,lab? Some feedback would be interesting.