We have a number of bags of pre-mixed concrete (Quikrete) around the shop that have been sitting around for awhile. Most are sealed but a few have been opened. All feel like a solid rock, not like a bag of sand.
if they're no good, I'd like to throw them out now. If they are good, I'd like to store them indefinitely for a future project.
How do I tell the difference without opening them?
Best Answer
Without opening...lift them, they should have some squeeze/give and feel soft. Hard as a rock, then most likely not good.