"RB" wrote in message
...
We have a massive concrete step that I'm going to replace. The question
is
whether or not I can bust it up with a sledge, in place.

The piece is 3'W x 4'L x 8"Thick.

Will whacking on it with a sledge finally break through that 8" thickness
and start shattering pieces off?

Sure it will. How old are you and do you have any plans for the next five
or ten years?