Concrete Cylinder break
Concrete Cylinder break
(OP)
7 day break at 2100 psi for 28 day 3000 psi mix. Would you considered this falling in the acceptable range for any early break. The break itself is non-conical and split from the center of the cap to one side. What type of break would this be classified as?





RE: Concrete Cylinder break
RE: Concrete Cylinder break
Hopefully, the later tests will be more representative, except the cylinders could have been made by the same technician.
If you had fly ash in the mix the strength gains will show up at the magic 28 days.
Dick
Engineer and international traveler interested in construction techniques, problems and proper design.
RE: Concrete Cylinder break
Just got a copy of the design mix 88lbs of fly ash or 0.63 cf of total the mix. what impact, if minor would this amount of fly ash have on the overall strength?
RE: Concrete Cylinder break
Dick
Engineer and international traveler interested in construction techniques, problems and proper design.
RE: Concrete Cylinder break
RE: Concrete Cylinder break
It kind of depends on why you are asking the question. If you only want to know if these test cylinders are on track to meet the 3000 psi minimum requirement at 28 days, I agree with the others. However, if you have 2100 at 7 days and you normally have say 2800 at 7 days, the 2100 psi break may indicate a production problem that needs to be fixed. If the production problem gets worse, or the inherent random variation in materials or processes further compounds the problem, you could easily have failing concrete in other loads or on other days.
RE: Concrete Cylinder break