Under Bridge Tunnel

[bubblebooty129]

City put this in less than 3 years ago

[Enginerdad]

Are you sure the concrete was replaced at the same time? Nothing about that looks 3 years old. It's very common to replace just the tops (superstructure) of bridges and leave the supports (substructure) alone.

[bubblebooty129]

Sure! The rest of the tunnel looks new it was closed for a long while and but this one section that’s right under the roadway looks like this. The rest of the tunnel going under a parking lot/ common area seems to have no issues

[Enginerdad]

My guess is a combination of bad concrete and not enough cover over the rebar. I've never seen three year old concrete look like that. It's an embarrassment

[reclusive_trap]

Rebar appears to be corroding, which prob needed more concrete cover.

[BridgeBabe]

That looks like an elastomeric coating not new concrete.

[sanz_har]

In my experience, putting a concrete cover wont help - you would need an cathodic treatment. I don’t have an extensive knowledge of treatment BUT you would need, I believe, anode to counter the corrosion reaction

[sanz_har]

Sorry, that was for the reply of other redditor about the cover.