Hello
The concrete ledge outside the entrance door has a slightly incorrect slope, causing a puddle when it rains.

I was thinking of trying to grind it a bit so the water runs off.

I guess I need to grind an area about 40x60cm and grind it down 6-8 mm.

Is it futile to try with one of these here on the angle grinder, or could it work?

The concrete ledge is meant to remain bare, so it can't be fixed with tiles or anything else.

It also makes it difficult to pour anew, as it would ruin the last step up to the ledge.
 
What will the surface be after a transition with it?
 
Smooth
 
Happy?
 
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