Polished concrete can be slippery? # 40C ConcreteNetwork.com

One might fear that polished concrete floors can be slippery, but if clean and dry, polished concrete floors are generally no smoother than plain concrete surfaces. And they tend to be less smooth than waxed linoleum or polished marble.

http://www.youtube.com/watch?v=S_NIwWQx5kE&hl=en