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RE: Wet Concrete Lateral Pressure

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I think your density is probably ok along with the maximum 4ft pour.  How do you rationalize that the concrete will reduce the pressure? I went through this exercise on a 25ft high retaining wall in which we were considering styrofoam backfill.  The geotech came back with a
*reduced* lateral design pressure and a lot of assumptions regarding how the foam actually worked. In the end, we ended up going with soil nails.  One thing with the concrete fill, you do have to make sure that you are replacing all of the soil in the active or at-rest wedge to guarantee you still don't have lateral pressure.

From: Joseph Grill [mailto:jrgrill(--nospam--at)]
Sent: Saturday, May 01, 2004 11:00 AM
To: seaint(--nospam--at)
Subject: Wet Concrete Lateral Pressure

Not to wish any others a bad day, but I'm hoping there is someone out there besides myself that is working on this fine Saturday and can help me with this quick question.
I have a project where the contractor is wishing to place a low strength high slump concrete fill behind a basement wall to reduce the lateral pressures to the wall.  The mix will be placed in lifts to reduce the immediate pressure due to the mix.  I'm thinking 4' lifts?  I have an older version (1995) of the ACI manual.  In 347R 2.2.2 it shows the lateral pressure as p=wh  where w is the unit weight of the concrete.  I've never had this situation before.  Is this the correct method for determining the lateral pressure, and what is the unit weight of this particular type of mix?  I'm thinking 140 pcf.
Joe Grill