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RE: cellular concrete fill

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It is done all of the time with cellular concrete.

And with light weight expanded shale aggregate.

I have even seen void systems formed using expanded polystyrene.  The
polystyrene would be used to form the voids of a system with stem walls and
a structural slab.  It is kind of like a skip joist system with the stems
bearing on soil.

Harold O. Sprague

> -----Original Message-----
> From:	Michael Hemstad [SMTP:mlhemstad(--nospam--at)]
> Sent:	Thursday, February 21, 2002 3:17 PM
> To:	seaint(--nospam--at)
> Subject:	cellular concrete fill
> Does anyone have experience or suggestions regarding
> the use of cellular concrete fill (in the 45 pcf
> range) for lightweight fill under roadways?
> I have an existing tunnel about 3 feet under a road,
> which analysis finds to be inadequate to carry the
> required loads.  Dead load eats a large portion of the
> available capacity; if I can effect a significant
> reduction in dead load, my live load capacity suddenly
> looks good.
> My concerns are degradation under long-term traffic
> load, and cost.  Groundwater is way down, so buoyancy
> is not a problem.
> Any discussion or information will be appreciated.
> Mike Hemstad, P.E.
> St. Paul, Minnesota

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