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Trying to repair that damage is an absolute watse of money and time. Anything you do will make it worse. From the looks of it although cracked and unsightly it is still in tact and not a hazard. If you only need a few years leave it alone.
If you feel you must do something go get one of those garage epoxy kits and put a layer on. It won't do much but it will seal the surface of the concrete and slow further water intrusion.
It lasted 50 years you can't ask for much more then that.
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