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Fwd: Re: Epoxy Coated Rebar[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: addseaoc(--nospam--at)euken.com
- Subject: Fwd: Re: Epoxy Coated Rebar
- From: rlewis(--nospam--at)techteam.org (Richard Lewis)
- Date: 30 Jul 1997 14:32:35 GMT
We had a guest lecturer back in school by the name of Douglas F. Burke who works as a researcher (he is a PE) for the US Navy. He told us about a study done by the Florida D.O.T. in 1987 that showed that bridges using epoxy coated rebar were showing severe corrosion after only 7 years. Burke spent 6 years testing concrete (literally thousands of cylinders) at Naval ports all over the world, testing calcium nitrite admixtures, zinc coating, and epoxy coatings to see how they performed in terms of corrosion resistance. Epoxy coating did the best, but only when applied with unrealistic quality control to prevent cracks or other damage in the coating. The end result was a new specification, called Fusion Bonded Epoxy (iron workers in San Francisco call it Barney Bar, I'm told, because it's purple). The ASTM spec on this is ASTM A934 / A934M, and was approved in March 1995. Some of the notable features of the new spec are that the coating is applied after the bars are bent into shape, specific handling requirements (mostly common sense, but they are at last written down), and special testing of the bars to assure there are no pinholes or cracks in the coating (it was found in the original study that a cracked epoxy coating was much worse than no coating at all). For my own $0.02 on bar coatings, they are an awful lot of trouble unless the structures exposure justifies that good, sound concrete won't be enough. Paul ---------- > From: Bob Shilling <shilling(--nospam--at)emf.net> > To: Raghu Pendyala <pendyala(--nospam--at)aqua.civag.unimelb.edu.au> > Cc: seaoc(--nospam--at)seaoc.org > Subject: Re: Epoxy Coated Rebar > Date: Tuesday, February 25, 1997 10:23 AM > > On Tue, 25 Feb 1997, Raghu Pendyala wrote: > > > > > In my opiinion epoxy coated bars are a complete waste of time and > > effort. > Raghu, > Is this opinion based on actual field experience, or on experimental data? > I see a lot of this being used lately, and am really curious as to why > some people are saying it's no good. > Thanks in advance, > Bob > > . . . . . . . . . . . . . ........................... > Bob Shilling, SE Berkeley, CA shilling(--nospam--at)emf.net > > --- Internet Message Header Follows --- Received: from server1.seaoc.org (bqe.com [184.108.40.206]) by host1.texramp.net (8.8.5/8.8.5) with SMTP id AAA06091 for <rlewis(--nospam--at)techteam.org>; Wed, 26 Feb 1997 00:17:36 -0600 (CST) Received: from mom.hooked.net by server1.seaoc.org (NTList 3.02.10) id wa004546; Tue, 25 Feb 1997 22:13:25 -0800 Received: from kellyrae.hooked.net (bass-41.ppp.hooked.net [220.127.116.11]) by mom.hooked.net (8.8.0/8.7.3) with ESMTP id WAA22790 for <seaoc(--nospam--at)seaoc.org>; Tue, 25 Feb 1997 22:11:12 -0800 (PST) Message-Id: <199702260611.WAA22790(--nospam--at)mom.hooked.net> From: "Paul McEntee" <pmcentee(--nospam--at)hooked.net> To: <seaoc(--nospam--at)seaoc.org> Subject: Re: Epoxy Coated Rebar Date: Tue, 25 Feb 1997 22:04:29 -0800 X-MSMail-Priority: Normal X-Priority: 3 X-Mailer: Microsoft Internet Mail 4.70.1155 MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 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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