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RE: dead end slab control joint

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Unless you have a full depth bond breaker and no restraints along the joint, such as dowels, I would expect that a crack will be reflected across the joint.  A control joint is a planned crack.  If the joint tries to open and there is any restraint across the 'T', the crack will cross under the perpendicular joint and show up on the other side.
Bill Sherman

From: Mark L. Puccio [mailto:mpuccio(--nospam--at)]
Sent: Saturday, June 16, 2007 1:15 PM
To: seaint(--nospam--at)
Subject: dead end slab control joint

Is it wrong to detail a control joint to come to a “T”? I have a floor with geometry such that when I layout the control joint spacing it would work out good if this is okay or will the crack continue thru the T? I can’t find any documentation one way or the other on this. I guess a safe thing to do would be to angle the cut or cut full depth – but I am wondering what some of your thoughts and experiences are.




Mark L. Puccio P.E., S.E.