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Re: Uplift Pressure of Wet Concrete?

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Here is a formula for lateral pressures of concrete taken from ACI 347.

P= 150+9000R/T < 150 h    --- for  R< 7 or = 7 ft/hr

P= equivalent fluid pressure in psf
R=vertical rate of placement in ft/hr
T= Temperature of concrete in Fahrenheit
h= height of concrete

For curved forms I would use this formula to get the uplift pressures.

I hope this helps.


Alex Nacionales











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----- Original Message ----- From: "Gary L. Hodgson and Assoc." <design(--nospam--at)hodgsoneng.ca>
To: "SEAINT Mail List" <seaint(--nospam--at)seaint.org>
Sent: Thursday, April 15, 2010 10:34 AM
Subject: Uplift Pressure of Wet Concrete?


List,

I'm currently working with some 1980mm (78" dia.) penstocks at an old hydro plant that are being renovated or replaced.

I have to design the temporary tie-downs at the thrust blocks or support points when they pour concrete around them. I did a similar project about 15 years ago but I can't find my reference material.

Does anybody know the uplift pressure (buoyancy) of wet concrete?

Gary


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