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RE: Concrete Mix for low permeability

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I recommend you put roofing or deck coating on the slab.  However you
may want to check out Xypex by Tnemec- a waterproofing that relies on
the crystallization within the concrete.

Vince Yu
Pickard Architects

	From:  MSSROLLO(--nospam--at) [SMTP:MSSROLLO(--nospam--at)]
	Sent:  Monday, April 26, 1999 4:59 PM
	To:  seaint(--nospam--at)
	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.

	Ron Martin
	Tuscaloosa, AL