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Polygon
I re-read your initial post and i guess you're planning on having the slab as the floor?
In that case, you're probably better off re-pouring if you have doubts about the existing slab.
My building is primarily for working in, although bikes are stored here too. I wanted to raise it (actual floor is about 20cm off the ground) so i could insulate the floor and heat the room without worrying about condensation, but you presumably wouldn't have those issues.