28 day, for the HVFA or Slag mixes. But it's quite common now up to
50% on the LEED projects I'm working on. It's more of an impact on
construction schedule with concrete column and slab buildings. I
believe there are some issues about the color of concrete or it's
reflectivity when it's use is exposed or unfinished as well to
consider.
-gm
On 3/12/09, sscholl2@juno.com <sscholl2@juno.com> wrote:
> My recommendation is to be careful using slag from steel mfg. I was involved
> in finding out why a reservoir in Pomona, CA had a significant number of
> "pop-outs" and it was deternined that the slag used as course aggregate was
> the reason.
> Stan Scholl, P.E.
> Laguna Beach, CA
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