Look and see if anybody does epoxy injection. It's a technique used to repair cracked concrete. Basically you take a tube with a foot on it, glue it over the crack and repeat. Typically the tubes are placed the concrete slab thickness apart on the crack. Take more epoxy and cover the crack. The next day the epoxy is injected into the crack, keep injecting until you see it flowing under the next tube. Pull the injection machine off of that tube, cap it, and move to the next tube.
When you are done, let it set up for a day, then use a torch and a scraper, grinder or some other tool to remove the epoxy that was used to seal the cracks, and the tubes come with it.
It's an approved fix for concrete. It has been used to waterproof a floating highway, basically glue the L.A. Coliseum back together after the Northridge earthquake, seal foundations, building slabs, parking structures, etc., etc.
I don't know what will be more cost effective for you. Or if it will work, but it could be something to look at. The epoxy is actually stronger than the concrete, and the machine that I am familiar with uses air over hydraulic to achieve around 20,000 psi injection pressure.
