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- Subject: Fwd: Re: Epoxy Coated Rebar
- From: rlewis(--nospam--at)techteam.org (Richard Lewis)
- Date: 30 Jul 1997 14:33:01 GMT
I would never specifiy the use of epoxy coated reinforcement. From my experience in the Middle East, where concrete durability is of paramount concern due the extremly harsh enviroment (high chloride levels in groundwater/wind blown salts/high temperatures etc.) the use of epoxy coated steel has done nothing to enhance the service life of concrete structures. In the design of water retaining structures the effect of reduced bond between the epoxy coated steel and concrete leads to a reduction in crack control which has serious consequences for durability.The handling of epoxy coated rebar must be carried out with great care. Any chips/hollidays in the coating have been shown to accelerate the corrosion of the rebar due the concentration of cathodic action. The best course of action is to ensure a dense mix. Use the lowest possible water/cement ratio and provide proper curing (essential for durable concrete). If added protection is necessary consider the use of cathodic protection, external membranes, corrosion inhibitors (calcium nitrite) or hydrophobic pore blockers. The C.E.B. has some good references on durable concrete and the protection of reinforcement. Regards, John Brasier At 15:34 24/02/97 -0800, you wrote: >I am interested in people's opinions about the use epoxy coated rebar? Under >what conditions will you use it? (i.e. standing fresh water, sea water, open >concrete channel, etc.) I am also interested in any good references about >protection of rebar and under what conditions you need to look at options like >epoxy coated rebar or special concrete additives. > >Thanks > >Stephen Fisher, PE > > > > --- Internet Message Header Follows --- Received: from server1.seaoc.org (bqe.com [220.127.116.11]) by host1.texramp.net (8.8.5/8.8.5) with SMTP id LAA16753 for <rlewis(--nospam--at)techteam.org>; Tue, 25 Feb 1997 11:01:04 -0600 (CST) Received: from csc040.emirates.net.ae by server1.seaoc.org (NTList 3.02.10) id ia004506; Tue, 25 Feb 1997 08:58:26 -0800 Received: from @emirates.net.ae ([18.104.22.168]) by ns2.emirates.net.ae (SMI-8.6/8.6) with SMTP id UAA24519 for <seaoc(--nospam--at)seaoc.org>; Tue, 25 Feb 1997 20:55:24 +0400 Date: Tue, 25 Feb 1997 20:55:24 +0400 Message-Id: <199702251655.UAA24519(--nospam--at)ns2.emirates.net.ae> X-Sender: seaoc-ad(--nospam--at)seaoc.org X-Mailer: Windows Eudora Light Version 1.5.2 Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" To: seaoc(--nospam--at)seaoc.org From: John Brasier <brasier(--nospam--at)emirates.net.ae> Subject: Re: Epoxy Coated Rebar Reply-To: seaoc(--nospam--at)seaoc.org Error-To: seaoc-ad(--nospam--at)seaoc.org X-Loop: seaoc(--nospam--at)seaoc.org X-Info: [SEAOC] Owner: seaoc-ad(--nospam--at)seaoc.org X-POP3-Rcpt: seaoc-ad(--nospam--at)seaoc.org Precedence: list X-ListMember: rlewis(--nospam--at)techteam.org [seaoc(--nospam--at)seaoc.org] __________________________________________________ Richard Lewis, P.E. Missionary TECH Team rlewis(--nospam--at)techteam.org The service mission like-minded Christian organizations may turn to for technical assistance and know-how.
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