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Too much maintence to keep the ice from melting with all the heat given off by doing anything and everything aboard the ship. The advantage of concrete hulls is they are cheap and easy to maintain, given rust isn't a worry as long as you have the outermost bits of rebar far enough away from sea...

Honestly, Any sort of flotation based sea steading will be a concrete hulled barge or pontoon like oil platforms rather than steel hulled. At those sizes, you don't really care about the incresesd mass cost of a concrete hull compared to the cost and maintenance advantages.