I'm looking for some assistance on how to repair the bottom of a concrete slab in a parking garage. The contractor decided to start repairing the slab by saw-cutting around the spalling area but the area was so large that entire lengths of rebar started to fall. Fortunately he shored the slab but now I have a 180 sf area that needs new rebar and repair mortar. I would like to form the area, core holes and then pour the repair material into the formwork. My problem is I have to support the slab while it is being formed. I have shoring posts at a 4 ft grid. I was going to place a stainless steel pipe at the top of each post and then form around each post while anchoring the formwork to the slab with post installed anchors. After the repair mortar cures I was going to grind the pipes to be level with the slab. Does anyone have experience with this or a better idea? I'd really appreciate it! Thanks!