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Concrete spalling

Concrete spalling

Concrete spalling

What are good references on how to repair concrete for spalling?  I am currently doing a project where 8" square pedestals have spalled.  In some cases the rebar is exposed and have corrosion.  Is spalling repair a good idea?  I at first submitted a design for complete replacement but the cost was too high.   

RE: Concrete spalling

Spalling is caused by inadequate cover to reinforcement, which leads to corrosion.  The products of corrosion occupy more volume than the steel, thus the oxides push the concrete away.  8" square pedestals are very small for structural concrete, therefore the reinforcement has little cover.  Repair of these will likely be fruitless, resulting in repeat failures.  Suggest you rethink and replace the pedestals, doing it right this time.

RE: Concrete spalling

Agree with hokie66...if you repair, you'll be doing it again.  If you must repair though, look at Sika Products website...they have some good info on spall repair and on corrosion mitigation.

RE: Concrete spalling

I agree with hokie66 and Ron that for small elements, replacement is ususally more cost effective in the long run. For future reference, there is a lot of information on concrete repair techniques at the IRCI website (irci.org).

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