I hired a plumber to move a drain for a shower remodel and run a new drain for a tub. In the process of venting the two drain lines they chipped the slab back under the wall for the vent. As it turns out this was a slab beam and they cut the rebar in said beam. Anyone have any idea what the repair process is for something like this?

NOT a structural engineer, only an architect
that is hoping the repair will be simple

Job 1 is of course getting the steel covered with at least 2-3in
Maybe this a solution https://www.quikrete.com/athome/video-thin-repairs.asp
Maybe using the Red bag Quikrete (fast dry) with a form, then trowel
Maybe ... remembering once upon a time, a slurry was poured over the probelm using backfill as a "Form", so EZ ... curing, then coverup & or extra slurry troweled to finish slab ht.
Slurry: http://rb.gy/dvm9w

More likely that beam is preventing soil lift, so the upper steel is doing the work, so concrete patch not so critical.

Once you get an Aggie Structural Engineer's directive (check the license here or use to find one) then can throw this message away.
https://pels.texas.gov/roster/pesearch.html?ver=V062723

Thanks for the reply. According to the inspector the steel having been cut is the problem. I think you're right on with the slab repair.

What size rebar was cut? Was it rebar and not a post tension cable? Was it only one piece that was cut?

Definitely not post tension. Yes, only one piece cut. Looks to be 1/2" or 5/8" in diameter. The rest of the slab has steel mesh instead of rebar (they cut through plenty of that too as expected) so the metal in the slab beam is more substantial.

This is exactly what I was thinking the repair would be.

DeerHunter said:

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This is exactly what I was thinking the repair would be.

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Just check with an expert. While I do consider myself quite well versed in a lot of things from having to do my own work on my own stuff, the phrase "just enough rope to hang myself" may apply. As my user name suggests, my professional expertise literally deals with complete opposite part of the house than the one you are asking about.

There is likely more rebar in the remaining concrete that was not chipped out.
Put the plumbing in and then weld rebar back in and use some type of structural grout/hydraulic concrete to fill.

Or epoxy some rebar dowels in both directions and tie them together and then place concrete.

When they saw cut my lab in an office building, the plumber cut into our grade beam to run new sewer lines.

This was an interior beam, and not an exterior beam. But we doweled rebar back into the spaces (we cut rebar all through the slab), replaced the moisture barrier and then placed concrete back into the space.

I'd get a civil to look at it, but that was our 'plan' from the builders/engineers.

~egon