In a message dated 2/11/09 11:22:36 AM, Suresh.Acharya@ci.concord.ca.us writes:
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.
Excellent suggestions!
Ralph
From: Gautam Manandhar [mailto:Gautam_Manandhar@ci.richmond.ca.us]
Sent: Wednesday, February 11, 2009 10:08 AM
To: seaint@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
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