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RE: Saw Cut joints in concrete walls

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FYI, for walls I specify beveled pieces of wood nailed to the formwork to create control joints. If the wall is long, consider specifying expansion joints (complete separation) also -- at 3 x height intervals or less; and where geometry changes abruptly.
 
Suresh Acharya, S.E.


From: Gautam Manandhar [mailto:Gautam_Manandhar(--nospam--at)ci.richmond.ca.us]
Sent: Wednesday, February 11, 2009 10:08 AM
To: seaint(--nospam--at)seaint.org
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