Started the garage renovation project with the plan to grind the floor with a concrete grinder and paint with a 2-component epoxy paint. However, we ran into trouble after grinding. The floor had more cracks than anticipated, and the concrete sounded "hollow" in some areas. My partner decided it was best to open up one of the cracks a bit more to see how deep the damage was in the concrete floor.
The garage is not a slab on the ground but is built on top of a basement part in the late 60s. From what we can see of the hole that my partner opened, we have a layer of rough concrete underneath (structural?) that seems stable. However, it is light concrete (?) that crumbles when the top layer is removed.
How do we best repair this? Do we need to make the investment and break it all up, or can the cracks be repaired? We are a bit worried that the "concrete crumble" might prevent the new concrete from adhering if we pour it again.
Any tips and ideas are welcome!
The garage is not a slab on the ground but is built on top of a basement part in the late 60s. From what we can see of the hole that my partner opened, we have a layer of rough concrete underneath (structural?) that seems stable. However, it is light concrete (?) that crumbles when the top layer is removed.
How do we best repair this? Do we need to make the investment and break it all up, or can the cracks be repaired? We are a bit worried that the "concrete crumble" might prevent the new concrete from adhering if we pour it again.
Any tips and ideas are welcome!
