I have a concrete driveway in Texas measuring about 100 x 20 ft on a slope built in 2007. I don't know what the foundation looks like or the thickness, but have a call in to the builder to find out. It doesn't have a single joint, so of course now it has 4 cracks that each span with width of the drive. I want to seal these cracks to a smooth finish and create proper clean straight control joints and would welcome and ideas or experience from readers. I have no experience with this. One idea was to clean out the cracks fill with cement and then about 6 feet away create a straight control joint using a rotary cutter (not sure what the proper name is for this tool and whether or not it's something you can rent). Would that work? Is it possible to repair cracks to a smooth finish if you now have proper control joints? Is it possible to cut control joints? Can that tool cut deep enough (if the concrete is say, 6 to 8 inches thick?). Another idea which sounds more expensive was to cut out a 1 to 2 foot wide strip out of the concrete to include the crack (using the rotary cutting tool and back hoe) and then re-pour using one of those edges as the new joint). Is this a better idea? Any suggestions appreciated. Thanks in advance, Jim :) PS. When do you use a contraction joint versus an expansion joint?

I have a 100% useless concrete walkway from my front door to the side yard (maybe a 3'x12' area). I am uncertain of the depth of the concrete slabs, but how thick does it have to be before you must get a jack-hammer to break it up? The wife and I are going to recapture the area for landscaping.