failing concrete on rebar

[anonymous-user]

[redacted]

[RammyMP]

If ignored it will eventually fail and the building collapse. To repair it, the concrete needs breaking out locally and repaired properly but I suspect the problem may be from above so remedial work will be needed to your terrace, tanking or similar, which may not be cheap.

[WyrleyD]

Isn't this what's commonly known as "concrete cancer" which is a self accelerating deterioration process of the concrete internal structure where moisture is attacking the rebar and causing it rust and swell.

[CypSIdders]

I'm not a civil engineer, however I've done more concrete reinforcement drawings, for a civil engineer, than I care to remember.

This is a " how long is a piece of string" question.

There could be many different scenarios.
Could be poor materials used, (steel and concrete), poor tying of re-bar, incorrect design in the first place.
Could be external factors like water ingress, overloading etc.

OTOH, It could be superficial.

If the correct design was used and implemented properly, I would say the chance of a collapse are remote, but then again that depends on the things above!

How much? Pick a number, it will depend on what the actual problem is.

All you can do is wait for your engineer/surveyor's report.

When I was involved, it was in a earthquake zone, so significantly different designs, usually with more steel.