Vertical Post-Tensioning - Long delay before grouting

[efFeb]

Hi,
I am coming onto a project with vertical post-tensioning designed as bonded post-tensioning, with grouted encasement.
The tendons have been installed and stressed, but there has been a delay of several months, and the ducts have still not been grouted.
They have been protected from weather, but I am trying to figure out if leaving the tendons stressed, but ungrouted, for a long period of time would lead to additional losses that would not have been seen otherwise?
Thanks so much in advance,

 

[BAretired]

I would not expect grout to significantly alter prestressing losses which occur without grout.

 

[Ingenuity]

No additional losses expected due to delays in grouting but I hope the temporary weather protection was robust otherwise you may have some corrosion to strands.

If in doubt of losses or need to determine the actual level of prestress - and assuming the stressing tails have not been cut off - you could undertake a tendon lift-off test.

 

[KootK]

Interesting. Shear wall?

I also struggle to imagine a meaningful consequence to this so long as the grout tubes haven't been allowed to collect water / condensation etc.

A small amount of your shrinkage losses will now occur after grouting than before it. I don't see any harm in that though.