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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 It is not full strength though.

Thor Tandy
Victoria BC 
-----Original Message-----
From: NRoselund(--nospam--at) <NRoselund(--nospam--at)>
To: seaoc(--nospam--at) <seaoc(--nospam--at)>
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)