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Repair of reinforced concrete members.

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This may be relevant to those who are faced with rehabilitation 
of degraded reinforced-concrete structures.  As you all know, 
major corrosion in rebars manifests on the surface of the member
by cracks parallel to the rebar.  The most popular method for 
repair is by applying a coating of suitable epoxy after cleaning
the rebar to remove any corroded material.

I was recently informed by an engineer that the this method is 
not very good as the presence of epoxy coating prevents future 
surface cracks even if the bars are subsequently badly corroded
due to some problem.  As a result, the most important visual 
warning sign is eliminated making the entire process of epoxy
coating repair a very dangerous one.

I have not come across any technical reports indicating such 
problems.  However, my specialisation is in earthquake engineering
and my information in the intricacies of using epoxy coating may
not be as exhaustive.  I will appreciate any information on this
apprehension that has been raised.  If there is any genuine problem
with the use of epoxy repair of rebars, I feel that the information
should be very widely distributed since this is the most popular
method of rehabilitation of degraded section.

I look forward to more light on this issue.

-Dr. Ravi Sinha

Ravi Sinha, Ph.D.		email: rsinha(--nospam--at)
Assistant Professor		       rsinha(--nospam--at)
Department of Civil Engineering	       Phone: (91-22)-578-2545 Ext. 7336
IIT, Powai, Bombay - 400 076, India    Fax: (91-22)-578-3480, 578-3557