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RE: Saw Cut joints in concrete walls[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: Saw Cut joints in concrete walls
- From: "Paul Feather" <PFeather(--nospam--at)se-solutions.net>
- Date: Wed, 11 Feb 2009 10:50:13 -0800
Crack control requires the reinforcing be discontinuous at the joint. Whether it is a wall or even a simple slab on grade. The purist approach is to completely terminate the reinforcing each side of the control joint and use smooth slip dowels for the shear interlock. The other option is to cut 50 percent of the reinforcing, but I have seen good and bad results with this.
For a wall I usually spec slip dowels and also use a chamfer strip on the forms.
If the reinforcing is continuous, the wall will not even realize the sawcuts are there and will crack where tension from shrinkage is greatest. I have seen vertical shrinkage cracks 5 inches away from a sawcut. The cracks micro-form long before the saw cut is applied, and the continuous bonded deformed reinforcement does not permit formation of a designated failure plane.
Paul Feather PE, SE
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