How to sand down concrete?!?

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Billbill84

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Hi guys, quick question. I have an area at my garage door / driveway seam that's about 1/8" higher on the driveway side, than the edge of the garage door floor. I know 1/8'isnt very high but it's still enough to make water run back towards the garage. Is there a way to sand down the edge of the driveway slab the help with drainage and run off? I was thinking i could just take a file to that edge and make a shallow cut that would be level orthe garage floor but was worried this could cause potential weak spots and lead to cracking later in life. Or if there's a way I could sand down the driveway slab edge so water will run away from garage floor. What ?!?!?
 

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