Saturday, June 27, 2009

Re: Shrinkage of Concrete Floodwall

The wall is a floodwall.  Hundreds of homes will depend on it every 100 years or so.  The expansion joints will be sealed with expandable/contractable waterstops.  Hopefully, the product chosen will also be vandal-proof.  Thus, at the moment, my concern is the wall itself.

On Sat, Jun 27, 2009 at 2:26 PM, Ralph Kratz <> wrote:
Stan, just curious, but why are cracks a concern, whereas the potential similar-size gap in an expansion joint isn't?

Ralph Hueston Kratz

Sent from my iPhone 3G

On Jun 26, 2009, at 12:16 PM, Stan Caldwell <> wrote:

Shrinkage of concrete during curing seems to me to be one of those fuzzy areas of structural engineering practice.  Perhaps some of you can help shave the fuzz.

We have to design a small concrete floodwall on top of an existing levee.  The wall will be about 300 ft. long, 12 in. thick, and 2 to 3 ft. tall.  Joint spacing will be based on shrinkage, and joint width will be based on thermal expansion (101 dF in Dallas today).  Back to the shrinkage problem, this is a flood protection wall so we do not want any cracks.  We are thinking of 20 ft. joint spacing, but are having trouble justifying this choice, or any other, based on available literature.

Any thoughts?

Stan R. Caldwell, P.E.
HALFF Associates, Inc.
Richardson, Texas

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