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Re[2]: Concrete Mix for low permeability

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          ACI 350, Environmental Engineering Concrete Structures, 
          addresses the issue of low permeability of concrete 
          structures and its relationship to the mix design.  See 
          Section 1.3 of this document.  Hope this helps.
          Robert Rogers, PE


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-----Original Message-----
From: MSSROLLO(--nospam--at) [mailto:MSSROLLO(--nospam--at)]
Sent: Monday, April 26, 1999 5:59 PM
To: seaint(--nospam--at)
Subject: Concrete Mix for low permeability

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.

Ron Martin
Tuscaloosa, AL