I believe that the freeze thaw cycles over the years caused the damage. The wave action then pulled quite a bit of soil out from under the 'good' part of the slab.
Thanks for the feedback...I think based on the size of the hole, I'll try pouring through a pipe. As far as the top goes, maybe a...
I have a boat ramp that extends underwater. The last section, 2' under the waterline, is broken up and needs to be replaced. Anyone have any experience pouring concrete under 2' of water? (The area in need of repair is about 2' x 3') Is this possible, and if so, any tips (mix additives...
