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
______________________________ Reply Separator _________________________________
From: MSSROLLO(--nospam--at)aol.com [mailto:MSSROLLO(--nospam--at)aol.com]
Sent: Monday, April 26, 1999 5:59 PM
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.