It's not the outlet that is in question, it is the wiring method:
334.12 Uses Not Permitted.
(10) Types NM and NMS. Types NM and NMS cable shall not be used as follows:
d. Where exposed or subject to excessive moisture or dampness
The cement wall *can* be considered to be a "damp" location and be easily tested by taping some plastic to the wall...after a few days moisture may appear on the inside of the plastic.
I don't know about you (or anyone else), but it's a whole lot easier to just slap up a half a 2x4 up on the wall and staple the wire to it than it is to "test" the wall and strap the NM to the cement.
~~ CELTIC ~~
...-= NJ =-...