I was thinking the same thing, however, we do not know how the concrete was poured or how deep the seam joint is. If the seam goes the full depth of the concrete, then no problem with using the sledge hammer only. If, however it's a light surface seam, then it's likely that damage to the remaining concrete will occur if it isn't cut first. The happy medium between cutting full depth and possibly damaging roots and no cutting at all would be to cut along the seams to a depth of 1" to 1-1/2" then use the sledge hammer. The deeper seam will allow the concrete to easily split along the line without cracking the concrete being left behind. Before starting the cuts, I'd first remove the wood trim around the tree to see how deep the slab is and adjust your cutting depth accordingly. The cut only needs to be 1/3 to 1/2 the depth of the concrete to prevent damage to surrounding concrete.
Originally Posted by mpriley05
I would also recommend the use of a concrete diamond blade in a worm drive electric saw over the gas powered cut off saws because of better depth control and safety. As with all things, know and understand your equipment and use proper safety gear with its use.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!