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RE: Slab Stripped before time ...

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Thor,

I've seen Olsen Engineering (olsonengineering.com near Denver) scan concrete columns on an Air Force base.  I was impressed with their technology and knowledge.

MJ


--- On Mon, 5/9/11, jadair(--nospam--at)shwgroup.com <jadair(--nospam--at)shwgroup.com> wrote:

> From: jadair(--nospam--at)shwgroup.com <jadair(--nospam--at)shwgroup.com>
> Subject: RE: Slab Stripped before time ...
> To: seaint(--nospam--at)seaint.org
> Date: Monday, May 9, 2011, 8:05 AM
> Thor --
> 
> We recently had some very good success with having a large
> concrete
> column scanned using ground-penetrating radar (GPR). 
> The project was in
> Oklahoma and the test was done by a local testing lab there
> that
> provides the service.  It's likely there would be a
> company with this
> capability in your area.  They scanned all sides of
> the column,
> interpreted the results, marked the locations of the ties
> and main
> reinforcement on the column with masking tape so anchors
> could be
> drilled and epoxied into the column, and provided a report
> detailing
> their findings.  I was pretty impressed with the
> work.  It cost $1300.
> 
> -- Joel Adair
>     SHW Group
>     Plano, TX
> 
> -----Original Message-----
> From: Thor Tandy [mailto:vicpeng(--nospam--at)telus.net]
> 
> Sent: Sunday, May 08, 2011 5:30 PM
> To: SEAInt
> Subject: RE: Slab Stripped before time ...
> 
> Corrected typos
> 
>  
> 
> Interesting question .
> 
>  
> 
> I have been asked to do a structural review of an existing
> residence
> that
> has a significant area of the footprint a suspended slab on
> circular
> columns.
> 
>  
> 
> I understand that the slab formwork was stripped before the
> slab had
> completely cured . yes there is a noticeable trough in the
> main part of
> the
> slab.
> 
>  
> 
> It is a 6"+/- slab and the two-way span is approximately
> 15ft and the
> main
> deformation is probably about 2".  Built in 1990 the
> original owner, who
> is
> now selling, accepted the flaw.  There has been no
> perceived/recorded/admitted problem since.
> 
>  
> 
> In general the construction looks good and, except for some
> spalling of
> columns due to bits of tie-wire at the surfaces, appears
> sound.  The
> formwork was sonatube and although I have to get the
> original
> construction
> dwgs but I assume the reinforcing was tied steel cages.
> 
>  
> 
> My questions:  
> 
>  
> 
> 1)      Does anyone know of literature on,
> or record of, impact on the
> strength and/or serviceability of slabs that have deformed
> during the
> curing/strength-gain period?
> 
> 2)      Although the spalling appears
> localized to the tie-wire
> locations,
> there is number of them.  Could this also be a sign of
> deeper issues?
> I.e.
> would the tie-wire spalling open up access to the stirrups
> etc in the
> column?
> 
> 3)      Has anyone scanned columns for
> internal content checks?
> 
>  
> 
> Thanks
> 
>  
> 
> Thor A. Tandy P.Eng, C.Eng, Struct.Eng, MIStructE
> Victoria, BC
> Canada 
> 
>  
> 
>  
> 
> 
> 
> 
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