Yep, that sounds like concrete cancer. If the steel is rusting it will react with the concrete and weaken it further
That's entirely down to the noxious odour of having Coventry fans in on a regular basis! The place was fine for 20 odd years then within a couple of seasons...
After the stick the Brummies dished out to Coventry, how funny would it be if the ground is condemned ... ... and Birmingham have to play their home games at the Ricoh