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Fwd: Re: Concrete in Salt Water Environment

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I recommend using "plain" rebar and installing a cathodic protection system
to neutralize the ion flow. This ion flow is the true culprit of corrosion.

Regards,
Bill Allen

----------
> From: Lynn Howard <lhoward(--nospam--at)silcom.com>
> To: seaoc(--nospam--at)seaoc.org
> Subject: Concrete in Salt Water Environment
> Date: Sunday, March 23, 1997 6:49 AM
> 
> Dear List Members:
> We are involved in designing some structures that are for use in a
> research laboratory for marine environment (salt water).  This is here
> in the US, and is in an area where freeze-thaw cycle is not an issue
> (Santa Barbara).
> I am in a quandary as to what to do with the reinforcing steel.  We are
> going to use type V concrete, cover all steel with 2.5" minimum cover,
> use a strength of concrete in the range of 5000 to 7000 psi, and use a
> low W/C ratio (around .45)
> We are also going to be using a carefully selected source and gradation
> for our aggregate, to get a high density, low permeable, low reactive
> mix.  We are considering using some of the admixtures that increase the
> density of the mix.
> 
> From what I have read, the issue listed above are pretty much agreed
> upon by most professional in the design of concrete for a seawater
> environment.  However, as I read studies and articles, there is a big
> disagreement on what should be done with the rebar.  Epoxy coating,
> galvanizing, other treatments to rebar, and just using normal untreated
> steel seem to have their supporters and critics.  It seems that plain
> old steel without any treatment may be the way to go, if you use a good
> high density mix with plenty of cover over the rebar.  I am leaning in
> that direction, but the Owner (State of Calif.) seems to think that we
> should do something to the steel, and they do not feel comfortable
> without some kind of treatment to the steel. 
> 
> If someone who has had experience in this area could comment on what
> their views are, I would really appreciate it.  I have read many studies
> and articles in Concrete publications (ACI, etc.), but there does not
> seem to be a consensus on this issue.
> 
> Thanks
> 
> Lynn



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From: "Bill Allen, S.E." <ballense(--nospam--at)concentric.net>
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Subject: Re: Concrete in Salt Water Environment
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