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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 15:33:53 GMT
Norman Brudigam wrote: > How much of the structure is exposed to the splash zone (most critical)? Well, it vaires on the project. The pump house sits right on the beach and waves will be pounding it constantly (well, maybe not "pounding", here in Santa Barbara all of our waves must be gentle to fit in with our image you know :) ). There are concrete "pools" which contain salt water being pumped through them to create an environment for the marine life. No waves here, but constantly moving salt water. There there are portions that are completely under water (the intake line, which extend several thousand feet offshore.) And some of the building sits right near the water, but will only have salt water on the structure during a strom. > 0.40 is achievable with superplastisizers Yes, I was not considering the use of superplastisizers at first, but if it will allow the W/C ratio to drop to .40, then I am definetly going to use them. > gradation will be important for workability if you have lots of steel > and tight spaces I am going to try and design thicker concrete sections to minimize the steel, since the steel seems to be the problem here. > > cover and permeability are the most important in my book. Are you using > pozzolans? Fly ash or slica fume should be used to cut down the > permeability as well as the heat (thermal cracking). I am considering the use of Fly ash, or possibly slica fume. I have seen literature put out by various companies that advertise their admixture to decrease permeability and increase durability. They all sound wonderful, but I am wondering if these products really work. > > I know this works. Several years ago I investigated some 1920s piles in > Honolulu harbor that had decent cover (2 inch I think) with good > concrete (4000 to 5000 psi about). The failures I saw were related to > areas with less cover (1 inch) like the horizontal concrete framing. > > i suggest increasing the cover a little to allow for "field variations" > as was suggested by the Port of Oakland engineer. > I don't have an opinion on the epoxy coated steel. Caltrans seems to > use a lot of it. Putting a thin coating on steel, which is normally > handled very roughly, seems like a bad idea. you can't help but get > nicks and scrathes and an inspection hassle. I have the same concerns about the epoxy coating. How in the world can the typical rod busters be carefull enough to not put nicks in the coating. And how could any inspector be carefull enough to find the small nicks that might occur. Thanks for your input. It was very helpful. Lynn --- 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 JAA16152 for <rlewis(--nospam--at)techteam.org>; Tue, 25 Mar 1997 09:59:33 -0600 (CST) Received: from beach.silcom.com by server1.seaoc.org (NTList 3.02.10) id ha010823; Tue, 25 Mar 1997 07:53:59 -0800 Received: from lhoward.ten.net by beach.silcom.com (940816.SGI.8.6.9/SMI-4.1) id HAA04576; Tue, 25 Mar 1997 07:49:52 -0800 Message-ID: <3337F47A.C01(--nospam--at)silcom.com> Date: Tue, 25 Mar 1997 07:51:22 -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: <184.108.40.20670321223242.006a9af4(--nospam--at)seaoc.org> <333542F3.458E(--nospam--at)silcom.com> <33376CDC.1E63(--nospam--at)bayengineers.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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