In answer to the first part of this you can't really have polished concrete outdoors as it will get too slippery when wet.

Yes we most certainly can and they wear really well. Outdoor areas and driveways can be finished in a number of ways including CCC Acid Etch or with a matt penetrating sealer. A non slip finish can be added to some sealers.

There are two options for external finishes, either CCC Acid Etch or sealed with either an external penetrating or topical sealer.