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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?

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Without opening...lift them, they should have some squeeze/give and feel soft. Hard as a rock, then most likely not good.

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  • Or hit it (somewhat gently) with a hammer/mallet. You should be able to tell if its rock hard.
    – JPhi1618
    Oct 24, 2017 at 16:18
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If it feels like a solid rock, it has gotten wet and set up inside the bag. Trash em.

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