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Sawcutting of concrete topping on concrete plank

Sawcutting of concrete topping on concrete plank

Sawcutting of concrete topping on concrete plank

(OP)
We have a 2" concrete topping on concrete plank.  What is standard practice?  
Is advisable to sawcut the topping?  
If so would you cut 1/4 of the depth?  
What kind of spacing would be used?

RE: Sawcutting of concrete topping on concrete plank

I've never heard of using control joints in topping.

RE: Sawcutting of concrete topping on concrete plank

I concur with StructuralEIT.

I have never seen this done. The top surface of a precast piece (plank, double T, hollow core, etc) that is to recieve CIP concrete topping is intentionally roughened. The bond between the roughened surface and the topping concrete is quite substaintial. I think even if you cut a control joint in the topping, it would be so solidly bonded to the precast, that the joint would not make much difference as the topping can't move relative to the PC anyway.  

RE: Sawcutting of concrete topping on concrete plank

There is absolutely no reason to cut control joints in concrete topping on single span plank.  
However, at the centerline of supports where plank is butt-jointed, it is advisable to cut a control joint in the topping.

RE: Sawcutting of concrete topping on concrete plank

For hollow core plank, you can cut along every other plank joint, basically 8 feet on center.  No cuts in the opposite direction.  If the topping is composite I would call the plank company or engineer first.  

Spancrete link  

See the second bullet on the second page.

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