To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
Subject: RE: Concrete Mix for low permeability
From: Harold Sprague <harold.sprague(--nospam--at)neenan.com>
Date: Tue, 27 Apr 1999 08:27:06 -0600
Latex modified concrete has been used to decrease permeability, but it is
very costly. Post-tensioning is good to help hold the cracks together, and
it can reduce structural costs. These days I am inclined to go with the
bonded post-tensioning system.
The tried and true method is a waterproof membrane.
The Neenan Company
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.