I have a concrete slab on my drive, just in front of the garage door. It's where I park as the rest is gravel & that's where I work outside if its a decent day. Unfortunately the slab has a dip in the middle indicating that all edges are higher, obviously this makes a large puddle when wet which is only 3 or 4mm deep but over a fair area of the slab. The slab is about 30m2 overall. I was considering what I can do about this as it's a pain in the arse really. Googling brings up concrete grinding. Has anyone any experience of this? I've seen polished concrete showing the aggregate but on my drive I don't want a polished surface, as this would obviously end up like an ice rink when wet. So can this be done just to bring the concrete flat or even with a slight camber? But with a rough finish so I don't look like Mr Bean ice skating every time I go to the car. Alternative suggestions welcome.