Today we poured a large ICF project and thought everything went pretty well but later after the pour when we removed some pins that locked in place our bearing plate for the beam pocket, we realized we have a void below it. We vibrated the concrete but somehow this section did not consolidate as I'm guessing our mix got a little to thick. Anyhow, we will remove some of the foam under this in a day or two to reveal how much of a void / problem we have. From tapping the foam, I'm guessing it is about 6" under the bearing plate as wall feels solid below. There is a lot of rebar in the area to support the load from the beam so just trying to figure out suggestions on how to fix. Is it possible to wait for a week or two for concrete to cure, then chisel / hammer out loose area until we get to the solid below, then repour this area, leaving the rebar intact? Or is a non-shrink grout more suited? This is going to support a W12x35 beam carrying a good portion of the house's floor joist for main level.

You can find how big the void is by using a narrow flat head screw driver, a long one. No need to remove the foam. Then grout it. I would do it as soon a possible. The grout will adhere better to damp concrete.

Thanks. How do you get the grout in place to insure it completely fills the void f we leave the foam in place? I'm guessing the trapped air needs a way to escape too.

Grout bag, hole thru the foam will allow access.

I forgot. Use a no shrink mix and don't add more water than directed. The water becomes a filler that will weaken the mixture when dry.