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How old is the building? The RSJ will also need some attention - shot blasting to get back to raw metal, rust converter, ROZC etc too.

Needs a good dose of chemo. Damage appears to be extensive due to the lack of cover. Repair will entail repropping the slab while the old rusted reo is exposed/treated/cut out, new reo tied in place and concrete sprayed over the soffit (shotcrete) alternatively kevlar bandages may be applied...

Extent of damage will determine what remedial work needs to be done. Damage will vary depending upon how long it has been there. Contact a structural engineer for specific advice.