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RE: Fusion Bonded Epoxy (FBE) Coated Reinforcement

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See below.

Harold Sprague
Krawinkler, Luth & Assoc.

-----Original Message-----
From:	Eqbal M. Kassam [SMTP:kassamem(--nospam--at)aramco.com.sa]
Sent:	Tuesday, May 26, 1998 1:46 AM
To:	'seaoc(--nospam--at)seaoc.org'
Subject:	Fusion Bonded Epoxy (FBE) Coated Reinforcement


I would appreciate all views on this issue.
What is the experience of FBE coated reinforcement used in concrete in aggressive environment- high chloride / sulfate exposures?
It works well for chlorides, and is the tradition in bridges everywhere.  If sulfates are a problem you need to modify your mix.  

I believe durable concrete can be obtained by proper materials, mix design, curing, etc. Is there any additional benefit in using FBE coated reinforcement?
True.  But if a path for chloride presents itself (flexural cracking, misplaced rebar, bad batch of concrete, etc.) chlorides will find and corrode rebar.  It is a common occurrence.  It is inexpensive protection.

Also, I understand that poorly handled and damaged FBE can actually result in faster deterioration of reinforcement. Any comments ? Since coatings contain pinholes, can this cause more problems.
Yes.  They are called holidays in the industry.  Right a tight inspection and repair spec.

Can the coating debond after say 15 to 20 years? 
Not if properly applied.

A few years ago, a structure in Florida that used FBE reinforcement actually deteriorated much faster. Are there any similar results ? What about highway bridges?
This was an enormous can of worms.  Ken Clear vs. CRSI.  It was ugly and went to court.  Ken lost, but his efforts did result in tighter specs.  The bridge in Florida was a big sales opportunity for the corrosion inhibitor industry.  But the truth (although gray) fell more into the "did not meet spec and was missed on inspection category".  Excessive holidays, poor rebar inspection, insufficient cover, etc. 
Get a copy of the CRSI Performance Research: Epoxy Coated Reinforcing Steel, June 1992, by the CRSI.  It was actually generated by Wiss, Janney & Elstner under CRSI contract.
Thanks in advance
Eqbal Kassam



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