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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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Since no one else has mentioned it; the depth of pour is important. ...don't think that 2" tall section will be enough (rebar or not) ...I would guess that 10+ ought to do it.
Also, the weakest region will be where your pour interfaces with any existing curb. That's where you want to (if you're OCD about cracks) put any reinforcement ... "dowels" relatively short chunks of #4 rebar bonded into existing, prior to pour.
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong.
Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee. 
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