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RE: Concrete Mix for low permeability

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How about a roof?

Paul Meyer
250-368-2407
pmeyer(--nospam--at)hasimons.com

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.