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purposely permeable concrete

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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)