I recently had a patio installed in my back yard and had to get the concrete step down removed to do so. When it was removed the contractors dinged up part of the concrete slab under the door and I need to patch it up. I'm wondering what I should use to fill the gap and also what I need to use to patch the surface - you can see there is some sort of textured strip (notice the red weaving), but I don't know what that is or how to get it to look like the rest of the house. Any help would be appreciated.