Todd H. wrote:

"Heathcliff" writes:

Yesterday as I was digging a fence post hole I hit an obstacle about a
foot down, and ultimately dug out a big blob of concrete. Looks like
it was how some previous owner set a fence post. It's an 18-inch
diameter blob (roughly spherical) of concrete with a shallow (maybe 6
inch) hole in the top. This thing is way too heavy to put out with the
trash. So, how do I break it up for disposal?

A big sledge will get er done...

I've been trying to break up a 30 gal drumful of concrete with a big sledge
for a few days. Each humongous blow dislodges a teaspoon of concrete. Where
can I buy a "plug and feathers" aka "rock jack" or some expanding powder?

Nick