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Old Concrete Repair Question

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I have a project with an older building (built in 50s I think) that has some 
of the concrete spalling off .  The building is a concrete beam/column system 
with about 6" concrete walls and concrete roof.  To date, all I see is the 
clear cover spalling off the main beams and some roof purlins/joists.  I do 
not see any major damage to the section other than this spalling.  It is 
spalling back to the tension reinforcing/stirrups.  

Any good suggestions for providing protection of the steel?.  The inside of 
the building has fairly high humidity.  Water is used in their process.  

Also, does anyone have an idea what was "considered" minimum reinforcing back 
in the 50s.  We do not know what reinforcing was used during the original 
construction. I was wanting to estimate the beam strength based on current 
code requirements.

Ron Martin
Tuscaloosa, AL