If you make a gap between the two slabs, it will not give you the behavior as we can except from a one continuous slab .I think it should not be done also because in the absence of concrete at the max bending moment point your reinforcement may become a hinge and can collapse!
I have an exterior concrete balcony with a 15' cantilever and 10' backspan. I expect that no matter how thick I make slab I will get deflection and a crack over the support. would it be best to detail a pour joint over the support or cut a crack control joint to control the crack? joint could be filled with caulk / flexible joint sealer.
Also, project is located on a bluff about 1/2 mile away and 300' above the ocean (Malibu). For slab exposed as finish, is anything recommend fro rebar protection? I was thinking 4000 psi conc with w/c = 0.5 max, and 2" cover. should I include something like xypex in the mix, or increase rebar cover, or am I distant enough from ocean that salt will be a minor issue?
Thanks in advance,