I am investigating a rather large crack in a PT parking structure (see attached photos). It is believed that this crack has existed since the time of the post tensioning which occured approximately 30 years ago. The photo is of the east end of the crack and the crack runs west for approximately 60' then moves approximately 15' south and runs for another 60' before terminating. At the east end there is a continuous concrete wall that appears to be poured monolithic with columns. Originally, I thought this concrete wall was creating restraint and that the PT force was not getting into the slab. If this were the case I would have expected the crack to close up within 30' from the east end and instead the crack runs approximately 120'.
Any thoughts on what could be causing this crack?
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