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Re: 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.

Why are you not able to put waterproofing on the slab as for a normal
roof/deck?

James Cohen
James Cohen Consulting, P.C.
PO Box 130
Pennington, NJ 08534
Tel: (609) 730-0510
Fax: (609) 730-0511
Website: http://expertpages.com/~jccpc