Here is another example of encaustic on cement. I have added a a bit to this since this was taken and if I can get my act in gear I will take another shot and update this post with that.
I am always searching for something strong - concrete seemed to me to be the ticket - but it is actually pretty fragile and susceptible to breakage. I do like the effect with encaustic, it has a dreamy quality.
This piece is about 16"X16"