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Concrete Mix for low permeability

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Does anyone have any information concerning what to add to concrete mix or 
specify for an overhead slab that is exposed to weather.  It is needed to 
minimize cracking and reduce permeability.  I am designing around 4000 psi 
and the slab has a room under it.  

I have never done a slab that had "dry-space" under it.

Thanks.
Ron Martin
Tuscaloosa, AL