HELP !!!! Concrete contractors, I need advice

[56nash]

I have a problem, potentially a big one. I knew we had a hollow area bulging up in the middle of our garage floor, so I got to looking into it tonight. The garage floor is the ceiling of the garage below, a slab approx 5 1/2' thick there has been a crack for years, it was cracked and spalling when I moved in 9 years ago and now it was time to get around to fixing it before doing epoxy. I took a chisel and with no effort at all a piece about 8" x 12" popped right out. It is about 2 inches thick where it popped out. I am scared shitless now. I am afraid to look much furthur, the bulge in the floor continues another 3 feet or so and seems to follow one of the reinforcing bars in the concrete. If this is safe to do, I would like to remove the bulged part that is simply sitting on the surface now as it is, and fill with patching cement and epoxy over or maybe get an EPDM membrane and cover the entire floor and put racedeck over it.

this is what I found

 

[folgers]

You really need to have someone inspect your deck and see what the extent of the damage is. First and foremost it's a safety issue. Secondly you need to stop the corrosion of the re-bar and fix any damage right the first time. Look at it as a opportunity to get it fixed now before it gets worse and cost more to repair.
Engineers usually specify how deep re-bar is to be set into the concrete. They want it on the tension side of the slab and it needs to be protected from the elements. You may just have some re-bar that wasn't set deep enough when the deck was poured to protect it. Have someone look at it and develop a plan to fix it before you just patch over the top.

 

[LegacyIndustrial]

If your void is less than 2" thick you should use an epoxy mortar/patch.
They are way stronger than cement based products for this type of repair.