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Re: purposely permeable concrete

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There is an "aerated" concrete used in New Zealand that is actually often used for drainage when piping is not wanted.  Try www.ipenz.org.nz/. It is not full strength though.

Thor Tandy
Victoria BC 
-----Original Message-----
From: NRoselund(--nospam--at)aol.com <NRoselund(--nospam--at)aol.com>
To: seaoc(--nospam--at)seaoc.org <seaoc(--nospam--at)seaoc.org>
Date: Saturday, June 06, 1998 9:12 AM
Subject: purposely permeable concrete


>I'd like to install a retrofit foundation under an existing adobe wall in
>order to shut down a high-rise ground-squirrel condominium.  It need not be
>reinforced, nor high strength; ideally, it would be permeable to prevent the
>formation of a barrier to moisture that enters the wall from above, and to
>keep ground-moisture from rising  by capillarity.  Has anyone had any
>experience with designing a permeable concrete mix by using coarse and fine
>aggregate, but omitting intermediate sizes of aggregate?  Are there handling
>or placement problems with such a mix? 
>
>Nels Roselund
>Structural Engineer
>(Only works on buildings that are older than he is)  
>
>
>