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Saw Cut joints in concrete walls

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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