How long should the cold-joint be cut

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These joints should be cut within 6 to 12 hours of finishing the concrete and should be cut to a depth of about one-quarter of the concrete slab thickness. Concrete SawingHow Long can Concrete Sit before a cold joint forms? As a rule of thumb, we recommend that the time gap between the two batches does not exceed 30 minutes. Technically speaking, other factors can influence this time horizon, such as local temperature, type of cement used, concrete mix, etc. Control joints, also known as planned cracks, are placed to relieve stress caused by shrinkage during the curing process.

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