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Fwd: Re: Concrete in Salt Water Environment

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Norman Brudigam wrote:
> 
> ...<snip>...
> > I am considering the use of Fly ash, or possibly slica fume.
> 
> I can't think of a reason why you would not use at least 15% flyash
> replacement of the portland cement. It improves permeability,
> workability, lowers the heat of hydration and most concrete suppliers
> have it because it reduces the cost of the concrete.  Its a win-win.
> Silica fume is more costly and harder to get in an out of the way place.
> 
You might also consider substitution of ground blast furnace slag for
some of the portland cement.  Same advantages as fly ash.  The only
drawback is that strength gain is slower (but final strength is higher).

Jay B.


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