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Re: Low Concrete Quality - Units

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You can alos check out the following web page for unit conversions...

http://www.ex.ac.uk/cimt/dictunit/dictunit.htm

HTH

Scott
Ypsilanti, MI


On Mon, 18 Jun 2001 Tom.Hunt(--nospam--at)d-fd.com wrote:

> For those that do not do a lot of overseas work there are definitely two
> metric system used around the world.  The SI metric system (Newtons,
> Pascal's, etc.) is used throughout Europe and in U.S. textbooks.  However,
> in large portions of the Middle East, South America, and Asia the MKS
> (meter, kilogram, second) metric system is used.  If you buy rebar in these
> areas it will definitely be kg/cm2 instead of MPa.  If you use RISA-3D you
> will notice both unit options available.  As a side note, most of my
> conversion headaches have been trying to convert from SI metric to MKS
> metric instead of either one to U.S. Imperial units.  A very good units
> converter program is Master Converter by Savard Software
> http://www.savardsoftware.com/ .
> 
> Thomas Hunt, S.E.
> Duke/Fluor Daniel
> 
> ----- Forwarded by Tom Hunt/DFD on 06/18/01 10:03 AM -----
>                                                                                                                    
>                     "Lutz, James"                                                                                  
>                     <JLUTZ@eartht        To:     seaint(--nospam--at)seaint.org                                                 
>                     ech.com>             cc:                                                                       
>                                          Subject:     RE: Low Concrete Quality                                     
>                     06/15/01                                                                                       
>                     08:41 AM                                                                                       
>                     Please                                                                                         
>                     respond to                                                                                     
>                     seaint                                                                                         
>                                                                                                                    
>                                                                                                                    
> 
> 
> 
> 
> I've never heard of compressive strength being expressed as kg/cm2.
> Shouldn't it be N/cm2 or MPa? 210 N/cm2 or 21 Mpa is around 3000 psi. (1
> Ksi
> = 6.894 MPa.)
> 
> I've never used silica fume, but my understanding is that it dramatically
> reduces concrete permeability, which adds a lot to durability. I believe it
> has been used a lot for bridge decks. If you contact any distributor of
> this
> additive, I am sure they can give you plenty of information.
> 
> Try the following link.
> 
> http://www.masterbuilders.com/MB/pub/Products.asp?TypeCat=2&ParentID=101
> 
> 
> 
> -----Original Message-----
> From: Leonardo Zapata [mailto:Lzapata(--nospam--at)otepi.com.ve]
> Sent: Friday, June 15, 2001 8:18 AM
> To: seaint(--nospam--at)seaint.org
> Subject: Low Concrete Quality
> 
> 
> We have a problem in the foundations of the most important building of the
> Main Process Station: Central Control Room.
> It was initially a concrete structure supported on direct foundations but
> after foundations construction was already started, the structure was
> changed to Steel, therefore the foundation are over-dimensioned.
> A value of compressive strength at 28 days of 250 kg/cm2 was specified for
> all structural concrete in the project. During the construction, all
> footings were poured the same day and the average strength obtained for
> them
> at 28 days was between 285-306 kg/cm2. Five days later, all pedestals were
> poured and the average strength obtained for them at 28 days was between
> 149-166 kg/cm2.
> Venezuelan codes applicable in Oil Industry specify minimum 210 kg/cm2 for
> foundations, 250 kg/cm2 for aggressive environment and 140 kg/cm2 for lean
> concrete.
> The facilities are located in a no-aggressive environment and in a seismic
> zone with ground acceleration of 0.24g.
> Due to a bad inspection, the building is already totally built. We have
> performed the structural calculation with the low strength and apparently,
> there is no problem because the loads are lower than those used in the
> initial foundations design. As the timelife at the facilities is stated in
> 25 years, our main concern is about durability of the concrete. Contractor
> is arguing the use of Silica Fume in his concrete which increase the
> durability.
> Does anybody have experience about it?
> Any help is really appreciated.
> 
> 
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