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Concrete mix for placement in water

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Perhaps a comment.

Tremie pours of caissons should be continuous from bottom to top.

In a 24" pile of any depth, this should be quite easily done. 

Any weak layers would then be due to pulling the tremie up ahead of the
advancing concrete level which can be controlled. Even if it does briefly
come out of the concrete, unless there is a great deal of water in the
hole, the concrete is unlikely to be seriously affected.

Removing a foot of so of even greatly weakened concrete from any depth of a
24" hole, filled with reinforcement, using a sandblaster is not a terribly
practical idea, and should not be necessary.

Peter S. Higgins

Message text written by INTERNET:seaint(--nospam--at)seaint.org
>The concrete in contact with the water will be weaker.  On some tremie
pours there can be a significant layer of this weak concrete which you
should remove prior to making the next pour.  On one project this layer was
over a foot thick.   

One way to remove this weak concrete is by sandblasting which will quickly
remove the weak concrete.<


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