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- To: wai(--nospam--at)euken.com
- Subject: Fwd: Re: Concrete in Salt Water Environment
- From: rlewis(--nospam--at)techteam.org (Richard Lewis)
- Date: 05 Aug 1997 15:33:49 GMT
GCHOCK(--nospam--at)aol.com wrote: > I hate to be the one to throw cold water on some of the recent postings, but. > . . Cold water is appreciated here!! :) > The discussion of epoxy-coated rebar has understated the real problem with > "holidays", the penetrations through the epoxy coating which in general are > not visible But Always present, and very large in comparison to water and > chloride ions and most highly significant to corrosion. These become sites > for accelerated corrosion which invariably reaches below the coating and > travels laterally, eventually shedding the epoxy due to expansion. Field > coating of visible damage is almost illusionary in providing a solution to > these sites of corrosion, i.e., it practically is close to as good as > nothing! You should read the Wiss Janney Elstner reports on corrosion of > rebar with various treatments to get a more realistic viewpoint of relative > effectiveness. I have read some similar reports, and that is why I have posted this question. I have read similar reports that galvanizing is great, or worthless, depending on who's report you read. Despite all the negative reports on Epoxy caoting of rebar, there are still very significant projects being designed and built with epoxy coating. Some by Engineers who are very qualified in this area. If I go by the reports I have read, I would not use epoxy coating. But I wonder, when I see brand new seawater structures just starting construction that are using epoxy coating. I ask myself what these very experienced engineers know that I do not. Why are they still using epoxy coating when there are so many negative studies our there on the subject? Lynn --- Internet Message Header Follows --- Received: from server1.seaoc.org (bqe.com [126.96.36.199]) by host1.texramp.net (8.8.5/8.8.5) with SMTP id KAA16308 for <rlewis(--nospam--at)techteam.org>; Tue, 25 Mar 1997 10:09:45 -0600 (CST) Received: from beach.silcom.com by server1.seaoc.org (NTList 3.02.10) id ka010826; Tue, 25 Mar 1997 08:01:41 -0800 Received: from lhoward.ten.net by beach.silcom.com (940816.SGI.8.6.9/SMI-4.1) id HAA05478; Tue, 25 Mar 1997 07:57:34 -0800 Message-ID: <3337F648.317C(--nospam--at)silcom.com> Date: Tue, 25 Mar 1997 07:59:04 -0800 From: Lynn Howard <lhoward(--nospam--at)silcom.com> X-Mailer: Mozilla 3.0Gold (Win95; I) MIME-Version: 1.0 To: seaoc(--nospam--at)seaoc.org Subject: Re: Concrete in Salt Water Environment References: <970324231639_1949995454(--nospam--at)emout04.mail.aol.com> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit 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 X-Sender: 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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