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RE: High Fly-Ash in PT slab

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I’ve never specified “high fly ash”, but around in this area the power company dumped it as a landfill for a golf course.  Now the groundwater is contaminated with toxic chemicals and the lawsuits have started.  I spec’d out some fly-ash for a municipal job fairly recently and the fly-ash was not allowed.


A Structural Engineer, P.C.

Glenn C. Otto, P.E.

Virginia Beach, VA



-----Original Message-----
From: Joe Goldbronn [mailto:jgoldbronn(--nospam--at)]
Sent: Friday, August 07, 2009 12:48 PM
To: seaint(--nospam--at)
Subject: High Fly-Ash in PT slab


I have a client that is trying to maximize their “Build-it-Green” points by using high fly-ash in the concrete mix.  They are requesting between 20%-30% fly-ash.  Per the soils engineer we also need to use a slab-on-grade post-tensioned slab.  I have never tried to use high fly-ash on a post-tensioned slab before and am having a hard time finding anyone or any reference that has done so.  Does anyone have any experience with this or know of any good references?   


Joe Goldbronn