Retro-fitting of rusted reinfocement ( beam and col )
Retro-fitting of rusted reinfocement ( beam and col )
(OP)
Good day to all!
Our company ( a construction firm ) has been approached to check on a rusted reinforcements of slab, beam and rebars under the Comfort rooms of a school building.
The building is quite old ( around 30 years ). The beams and slab has already cracked mainly due to the expansion of reinforcements.
The problem may have started with the waterproofing of the CRs which were not done correctly or not placed at all.
Anyway, the second floor column has also rusted reinforcements which has been exposed already. The building is 6 storeys high.
Queries :
1.) What measures can be done for this problem?
( confined only to the CR area )
2.) We were looking into planting a new system of columns beams and slab for the area from ground floor. Are there other options?
your response will be greatly appreciated...
Bet regards.
Our company ( a construction firm ) has been approached to check on a rusted reinforcements of slab, beam and rebars under the Comfort rooms of a school building.
The building is quite old ( around 30 years ). The beams and slab has already cracked mainly due to the expansion of reinforcements.
The problem may have started with the waterproofing of the CRs which were not done correctly or not placed at all.
Anyway, the second floor column has also rusted reinforcements which has been exposed already. The building is 6 storeys high.
Queries :
1.) What measures can be done for this problem?
( confined only to the CR area )
2.) We were looking into planting a new system of columns beams and slab for the area from ground floor. Are there other options?
your response will be greatly appreciated...
Bet regards.






RE: Retro-fitting of rusted reinfocement ( beam and col )
A complete study should be undertaken and quickly as you have damaged building components under stress.
30 years is not "quite old". A properly designed, constructed and maintained reinforced concrete structure should perform many years past "30".
RE: Retro-fitting of rusted reinfocement ( beam and col )
RE: Retro-fitting of rusted reinfocement ( beam and col )
RE: Retro-fitting of rusted reinfocement ( beam and col )
RE: Retro-fitting of rusted reinfocement ( beam and col )
Anyway, just curious if there is a protective coating product for reinforcing bars. A protective covering that need not be stripped off the bars prior to concreting...
If so, any websites I can go to?
More power.
RE: Retro-fitting of rusted reinfocement ( beam and col )
Also, alternative materials such as stainless steel are suitable for extremely aggressive conditions.
RE: Retro-fitting of rusted reinfocement ( beam and col )
While all of the suggestions you have received are good, you also need to look at whether calcium chloride (CaCl) was added to the concrete to accelerate curing, or the concrete contains some other agent that is promoting rebar corrosion. This could be a significant factor in the expansion of the rebar.
Are you replacing the columns entirely, or just "rehabilitating" them? If the concrete itself is a problem, I'm not sure that simply coating the rebar will solve the problem permanently.
Please see FAQ731-376 for great suggestions on how to make the best use of Eng-Tips Fora. See FAQ158-922 for recommendations regarding the question, "How Do You Evaluate Fill Settlement Beneath Structures?"
RE: Retro-fitting of rusted reinfocement ( beam and col )
We are evaluating which options to choose... either rehabilitate or replace....
thanks for all your answers.
If there are still other opinions... kindly post...
RE: Retro-fitting of rusted reinfocement ( beam and col )
Please see FAQ731-376 for great suggestions on how to make the best use of Eng-Tips Fora. See FAQ158-922 for recommendations regarding the question, "How Do You Evaluate Fill Settlement Beneath Structures?"
RE: Retro-fitting of rusted reinfocement ( beam and col )
Our concern will be on how much surcharge to use (caused by the building)?
Any leads on how to compute surcharges in general?
RE: Retro-fitting of rusted reinfocement ( beam and col )
Safety should be the first concern. Secondly, the cause of the corrosion should be stopped. Finally, repair of the structure.