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[SEAOC] RE: [SEAOC] Preventing Corrosion of Reinforced Concrete In Severe Marine Exposures[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc <seaoc(--nospam--at)power.net>
- Subject: [SEAOC] RE: [SEAOC] Preventing Corrosion of Reinforced Concrete In Severe Marine Exposures
- From: "Sprague, Harold O." <SpragueHO(--nospam--at)bv.com>
- Date: Fri, 06 Sep 96 15:41:00 PDT
- Encoding: 63 TEXT
I would be very cautious about banishing epoxy coated bar. Ken Clear was sued by CRSI for his report. Call Don Pfeifer of Wiss, Janney for the other side. Epoxy bar has performed well in many other applications, and the project in Florida and Ken Clear's work is just a reminder that the coating must meet specifications. Harold Sprague Black & Veatch ---------- From: seaoc To: Tom Hunt Cc: sysop Subject: [SEAOC] Preventing Corrosion of Reinforced Concrete In Severe Marine Exposures Date: Friday, September 06, 1996 11:51AM Hi, I caught your thread while "surfing" for silica fume references on the Internet. Can I help? The use of epoxy coated bars has been a worry since the Florida State Highways Dept issued its report (1986?) on the state of their epoxy rebar built bridges after only 8-9 years exposure. They had deteriorated to a level seen only at the 12-15 year mark when normal steel is used. Add to that the open letter issued by concrete technologist Ken Clear in the USA (1990?) on the subject, saying that, after his years of research, epoxy bars had unfortunately proven to fail early in real life structures, and the message is pretty clear.....Don't use it! On silica fume, recently (JAN '96) in a conference in the Arabian Gulf in Bahrain, two papers were presented that cautioned specifiers that the latest scientific findings from research in the UK and Sweden showed that silica fume concretes are in fact very susceptible to ASR (Alkali Silica Reaction) and disintegration, accelerated in the presence of chlorides, and obviously, by the elevated ambient temperatures found in the Gulf. If you would like details of these and other documents, please contact me directly at my Compuserve address, I'd be happy to direct you to them. If you are in need of an enhanced performance concrete to prevent corrosion of reinforced concrete by seawater, or other water borne corrosives,.....with a time-proven, 35 year successful track record, then check out the Web site at http://www.buildata.com.au/cement.htm, or use an Internet Search engine, (Excite, or Yahoo) and look for "cementaid" I hope that this is of help and assistance to you. Michael Aldred. ... ...
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