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RE: Tremie Concrete

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Scroll down to the UFGS 31 63 26.00 10 Drilled Foundation Caissons (Piers).  There are many very good practices listed.  Among them is the practice of depositing the concrete at least 3 feet below the surface of fresh concrete.  If the tremie is too deep below the surface of the concrete, the tremie can break.  If it is less than 3 feet, there is a risk of creating a void. 
The concrete mix is not all that critical. 

Harold Sprague

From: T.W.Allen(--nospam--at)
To: seaint(--nospam--at)
Subject: Tremie Concrete
Date: Tue, 25 Mar 2008 11:30:54 -0700

I have a project which consists of small cast-in-drilled-hole piles. Some of them are 8 feet deep. Today, I found out that they encountered water at 3 feet. The soils engineer is O.K. with tremie concrete. I need to make some adjustments in the depth (increase) due to the buoyant forces. Heretofore, I had not specified anything special for the concrete mix and I don’t need a lot of strength. However, is there anything I should do with regards to the mix given the conditions of placement?




T. William (Bill) Allen, S.E.


Consulting Structural Engineers
V (949) 248-8588 F(949) 209-2509


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