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RE: Saw Cut joints in concrete walls

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I do not believe the wall has been poured yet.  I do not know that the reinforcing is – I’d presume it would be two layers as it is 12 inch thick.  The architect would like to control the shrinkage cracks by hopefully directing it to the control joint.


Gautam Manandhar, SE


From: Paul Feather [mailto:PFeather(--nospam--at)]
Sent: Wednesday, February 11, 2009 10:12 AM
To: seaint(--nospam--at)
Subject: RE: Saw Cut joints in concrete walls


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