This "delay strip" is cased in two locations for each deck of the Pelli Tower providing a place for shrinkage to occur. Post-tensioned reinforcement is tensioned here also. The strip is concreted after 21 days. Joe Nasvik

While conventionally reinforced, concrete structures typically exhibit visible and obvious warning signs as they weaken, deterioration of post-tensioned structures often remains concealed, delaying corrective action. Appropriately timed condition evaluations are critical in ensuring the safety of post-tensioned structures.

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