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RE: Recycled concrete in place of crushe

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California Dept of Transportation allows up to 50%, by volume, of reclaimed
material (asphalt concrete, portland cement concrete, lean concrete, cement
treated base, or a combination) for aggregate base in earth work.

We also allow its use for engineered fill (you must have the geotech watch
the content closely for changes by volume and excessive fines).  I am not
familiar with anyone substituting reclaimed material for crushed stone.

hth
Pat Symons
Sacramento

-----Original Message-----
From: Roger Turk [mailto:73527.1356(--nospam--at)compuserve.com]
Sent: Tuesday, March 12, 2002 12:22 PM
To: seaint(--nospam--at)seaint.org
Subject: RE: Recycled concrete in place of crushe


Wouldn't the cement paste tend to absorb and retain moisture to a much
greater extent than crushed stone?

A. Roger Turk, P.E.(Structural)
Tucson, Arizona

Jason Kilgore wrote:

. > As long as it is graded properly (i.e., meets the requirements you
listed
. > for normal crushed stone), there shouldn't be anything wrong with using
. > recycled concrete.

. > -----
. > Jason Kilgore
. > Leigh & O'Kane, L.L.C.
. > (816) 444-3144
. > jkilgore(--nospam--at)leok.com


. > -----Original Message-----
. > From: Albert Meyer [mailto:Ameyer(--nospam--at)martinaia.com]
. > Sent: Tuesday, March 12, 2002 8:39 AM
. > To: seaint(--nospam--at)seaint.org
. > Subject: Recycled concrete in place of crushed stone below slab on grade


. > A contractor has requested to use recycled concrete below the slab on
. > grade instead of the specified crushed stone.  It seems that this would
. > be an ideal base for paving applications, but since one of the purposes
. > of the crushed stone is to drain water away from the floor slab I would
. > want the recycled concrete mix to be graded to remove the fines.  Has
. > anyone encountered this substitution? What are your thoughts on it?  Has
. > anyone created aspecification for this?  Thanks in advance for your
input.

. > Albert J. Meyer, Jr., P.E.

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