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Repair spalled concrete pillars?

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I have a building with a fair bit of "concrete cancer", with the steel within the concrete corroding in places. I've spoken to a few people and seem to get endless products but no two people seem to recommend the same thing.

It is precast 180x100mm  pillars- and to these are attached further of the same that are rafters that form apex roof. Joints are pins  The pillars and rafters are structural. The remainder of the building is blockwork. I'm keen to get the pillars and rafters sorted and would appreciate if anyone could give any guidance on best way to do this.

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How advanced is the cancer? Is it around the rafter joints? 

Precast units can suffer with thin cover to the bar all round, your problem maybe tricky to fix. 

Pics will definitely help. 

Edited by Lord v

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If the steel is corroding then it sounds like you may be too late for a cure.

Do you have pillars that are spalling but the steel is not exposed? Any sign of rust streaking? What is the area of the repair?

You could try applying a zinc primer to any exposed steel then filling with a repair mortar, but as a minimum you would need to scabble back your conc to sound and ideally fully expose any steel. Pictures would help but replacement of pillars with exposed steel and repair of the others would probably be my advice. 
 

Fosroc do a good range of products that I have used on major projects before.

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