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RE: Saw Cut joints in concrete walls

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If the wall is already placed and the reinforcing is fully continuous in two layers, saw cuts will be completely ineffective and are a waste of time.  Crack control needs to be planned in the wall construction.
Paul Feather PE, SE

From: Gautam Manandhar [mailto:Gautam_Manandhar(--nospam--at)]
Sent: Wednesday, February 11, 2009 10:08 AM
To: seaint(--nospam--at)
Subject: Saw Cut joints in concrete walls

List members:


I was recently asked a question on how soon a contractor can saw cut a 12 in concrete wall (boundary wall) to install crack control joints.    The wall is free standing and varies from 5 to 10 feet in height.  No expansion joints were planned.  The rebar is in and concrete ready for pour.


Since a lot of the cracks are caused as the concrete dries and shrinks, it would seem appropriate to provide a saw cut as soon as possible.  ACI requires concrete to be cured for at least one week (regular concrete). 


I would appreciate your insight.


Gautam Manandhar, SE