Home Improvement Questions? Ask a Handyman for Answers
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There's no straight up easy answer. You want it wet enough to flow so you can work it. If it's too wet it can cause small fissures in the set concrete which can weaken the finished product. If there's no load on it (like a slab) then too wet isn't as big a deal as when the pour is for a footing or foundation. In commercial projects with engineering specs for the concrete a slump test is done to assure the mix isn't too wet.