Stripping. Stripping refers to the point in time where a casting can be removed from the bed and stored for further curing at the casting facility. There is no minimum time requirement. Test 3 cylinders, 1 cylinder from each of the 3 groups of cylinders (i.e. 1A, 2A, 3A) prior to stripping. Stripping strength is attained when the average compressive strength of the 3 tested cylinders equals or exceeds 80% of the specified minimum 28-day strength and no more than 1 cylinder in the tested set has a compressive strength which is below the 80% threshold by no more than 300 psi. If the above conditions are not met, a minimum of 1 hour must pass before a second cylinder from each of the same 3 groups is tested (i.e. 1B, 2B, 3B).
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