Who's the concrete guru? Rich?
Have an idea how I'd go about "repairing" this but wondering if anyone has engineering experience in this area.
This is an elevated maintenance area about 3 floors up, maybe 8-10" thick.
What I'm thinking:
- knock out any obviously loose previous patches. Drag some chain around or tap with hammer and listen for hollow sound.
- cut perimeter so repair area isn't feathered thin on edges
- use pneumatic industrial needle gun to get down to good concrete
- epoxy pin in new rebar adjacent to rusted pieces
- remove rotted rebar
- treat surface with adhesion promotor
- pour top coat
Of course, imo, this should all be done to engineering specs for rebar size, placement, pinning depth, chemicals and mud mix.
Engineering will also determine what the safe working load will be with equipment and personnel.