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Re: Concrete Density

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Mark,

The lateral pressure of wet concrete can be a little tricky as it is affected by a lot of variables such as the original slump, temperature, w/c ratio, add mixtures that retard or accelerate, and the rate of placement such as in a large tall column.  If you are seriously designing formwork I would suggest looking at ACI-347R, "Guide to  Formwork for Concrete" which has very good guidelines and formula for lateral concrete pressures and other suggestions for additional live loads.

Thomas Hunt, S.E.
Fluor



Mark Pemberton <markpemberton(--nospam--at)sbcglobal.net>
12/28/2005 10:52 AM
Please respond to seaint
       
        To:        SEAOC <seaint(--nospam--at)seaint.org>

        cc:        

        Subject:        Concrete Density

.




Greetings,
I have a couple general concrete questions.  1) what is the density of cured concrete in a saturated state?  (i.e. a saturated sidewalk)  2) do concrete roof tiles increase in weight substantially when wet?  3) what is the approximate equivalent lateral pressure of a concrete mix against formwork?  Thanks for any input.


Mark Pemberton, S.E.

Pemberton Engineering
502 Mace Blvd., Suite 2B
Davis, CA 95616

Ph:  (530) 792-0511
Fax: (530) 792-7109



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