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Time Constraints on Stressing Post-Tensioned Concrete Slabs

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Industry standard for when P/T slabs may be stressed is based on concrete strength reaching 3000 psi (or 3500).  Considering high early strength concrete, is there a guideline for the minimum amount of time before the tendons may be stressed?  Also, to prevent temporary shrinkage cracking in P/T slabs, is there a guideline for the maximum time a slab should remain unstressed?