Need a book? Engineering books recommendations...
Fwd: Re: Corrosion Inhibitors[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: wai(--nospam--at)euken.com
- Subject: Fwd: Re: Corrosion Inhibitors
- From: rlewis(--nospam--at)techteam.org (Richard Lewis)
- Date: 05 Aug 1997 18:00:12 GMT
---------------------------- Forwarded with Changes --------------------------- From: "seaoc(--nospam--at)seaoc.org" <seaoc(--nospam--at)seaoc.org> at -FABRIK/Internet Date: 3/26/97 1:51PM To: Tom Hunt at FDIV-06 *To: "seaoc" <seaoc(--nospam--at)seaoc.org> at -FABRIK/Internet Subject: Re: Corrosion Inhibitors ------------------------------------------------------------------------------- Juan, If your known corrosion is very localized then you can chip out the concrete, sand blast the reinforcing, and then use a suitable patching material (Contact Sika, they have lots patching products). Considering that you are sitting in saltwater and your corrosion problem is probably systematic then your only hope at this point is probably a cathodic protection system. If you (or your client) have the money you can hire a concrete/corrosion specialist who can map out the walls using, for example, ASTM C876 "Half-Cell Potentials of Uncoated Reinforcing Steel in Concrete" methods. This is an electrical test for determining corrosion activity of reinforcing steel. What you get is an equipontential mapping of corrosion activity that looks like a topo contour map. The normal cathodic protection system will consist of what looks like wire mesh or chicken wire (such as DSA anode mesh by ELTECH Systems or Ferex anode mesh by Raychem Corp) that is placed against the wall and then grouted in with a topping layer (it is actually a little more complicated than this). The system is then hooked up to an A.C. to D.C. converter with automatic control circuitry. This type of system should be designed by a corrosion specialist with experience in your particular application and who is familiar with the conditions in your area. To design an appropriate system they will need to determine the electrical continuity of the rebar, chloride content of the concrete, depth of rebar from the surface, physical structure limitations, A.C. power availability, rebar current density, etc. For more background (and all the correct buss words) look at the NACE (National Association of Corrosion Engineers) publications. They can be reached at 713-492-0535. Their publications cover concrete linings, cathodic protection, effects of concrete mix components, and there was even a NACE Paper No. 325 presented at their "Corrosion 96" conference on "Coating Disbondment in Epoxy-Coated Reinforcing Steel in Concrete" (A summary of the Florida DOT-USF experience with coating disbondment of epoxy-coated rebar!?!). Thomas Hunt Fluor Daniel ********************************************************* I have just completed a project in which we built basements in reinforced concrete to house machinery in a steel mill. The soil surrounding these has a high phreatic water level, and the water is saltwater. This project is located about 15 miles from the seashore. Now we have found evidence of corrosion in the reinforcement; does anyone have any experience on how to treat this problem? Any answer will be greatly appreciated. Juan C. Gray --- Internet Message Header Follows --- Received: from server1.seaoc.org (bqe.com [188.8.131.52]) by host1.texramp.net (8.8.5/8.8.5) with SMTP id MAA07773 for <rlewis(--nospam--at)techteam.org>; Thu, 27 Mar 1997 12:24:47 -0600 (CST) Received: from juliette.fabrik.com by server1.seaoc.org (NTList 3.02.10) id ca011260; Thu, 27 Mar 1997 10:02:20 -0800 Received: from primus.fabrik.com ([184.108.40.206]) by juliette.fabrik.com (post.office MTA v2.0 0813 ID# 0-0U10) with ESMTP id AAE149 for <SEAOC(--nospam--at)seaoc.org>; Thu, 27 Mar 1997 09:44:13 -0800 Received: by primus.fabrik.com (Fabrik F07.0-000) id Megw.1050285 ; Thu, 27 Mar 1997 09:45:45 -0800 Date: Thu, 27 Mar 1997 08:06:00 -0800 From: "Hunt, Tom" <tom.hunt(--nospam--at)fluordaniel.com> Subject: Re:Corrosion Inhibitors To: SEAOC(--nospam--at)seaoc.org Message-ID: <Megw.1050285(--nospam--at)primus.fabrik.com> 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.
- Prev by Subject: Fwd: Re: Corrosion Inhibitors
- Next by Subject: cracking in waffle slab
- Previous by thread: Fwd: Re: Corrosion Inhibitors
- Next by thread: Fwd: Re: Argentina