Demolition of Curved Parking Garage Ramp

I would suspect that it was normally reinforced. Can you use GPR or some other means of checking for reinforcing? Can you try using a light chipping hammer to carefully remove some of the concrete?

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

I don't see how it would be possible to post tension that ramp if the original parking structure were in place. Where would they have jacked from? The jacking ends would have been right where the existing parking structure was located. The only way they could have done it is if they had some anchor blisters on the bottom side of the slab but those would be pretty obvious and I think it would have been pretty difficult to get the PT jack that close to the existing building.

Agree with dik...probably conventional. Would see evidence of PT pockets all along the outside edge of the ramp.
Could be done with PT, but would require careful location of dead and live anchors.

First of all let me just express how profoundly jealous I am of this project. I demo / restore existing structures for a living and this one just looks COOL!!

Second, I agree with others that PT pockets should be visible somewhere at the perimeter or in-between sections. If you cannot see them, I would think it very unlikely to be PT'd. Ingenuity has more experience as a restoration contractor with PT'd decks though so hopefully he will comment.

Lastly, agree with dik that scanning would be a must prior to confirming any plan. If even for electrical or something running in the beam (I've seen major ducts run in-between slab expansion joints so that is not as crazy as it sounds). I use xRadar in Ontario as I have found them to be far more accurate than other GPR companies.

Everyone seems to agree with everyone... I agree with Enable... it's too nice a structure to demolish... sad

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

I agree with above replies - probably NOT post-tensioned.

When it comes to GPR scanning to detect (or not) PT - not all technician (nor equipment) are created equal.

Last week I got called to a commercial kitchen re-model where the GC was to install new floor sinks. They called a scanning company and told them it was a PT slab. GRP detected a 'target' at mid depth of a 7-1/2" slab - clearly labelled it as REBAR and GC had EoR approval to cut one rebar, so GC cored a 12" dia hole. It was a PT tendon. A rebar at mid-depth is not common - should have been a red-flag that it was a possible tendon. Two-way banded/distributed PT slab BUT with added 'no-drape' P/A tendons parallel and between the banded tendons - which is also unusual for North America.



Makes for an expensive floor sink.

So carefully select your GPR scanning company.

That's why when I'm dealing with post-tensioning stuff... I like low power chipping hammers...

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

So apparently it wasn't prestressed...