I while ago there was an article about breaking concert by drilling holes in it and pouring in a compound that expanded and broke it appart. Where and what?
You're right and the one product I have used is Dexpan and there is one other, but it you Yahoo/Google it you will find what youre looking for.
Not cheap, but good stuff. I broke apart my porch slab that was a "hunk" of concrete and it took about 3 holes and a gallon of the liquid breaker to take care of the porch. What a good time that was. The hunk was about 5'x3'x4'. The breaker busted it up in no time. I finished it off with a prybar. Enjoy.
It's a small world. Until you have to walk home...
If ya live where it freezes hard in the winter, palin ol' water will work.
FFFg black powder pours fairly well also.........