Bricks, Masonry, Asphalt and Concrete - winter salt dissolving cement?

Hello folks,
Searched all over for Cement & concrete and salt and saw nothing on this:
I understand that water seeps into cracks and expands to explode cement but last year I found a softball sized puddle of liquified cement in my walkway after salting over ice on this wintery east coast. I'm ready to seal it all up with general purpose wood & concrete sealer but wish to understand what went on with the reaction that chemically broke the cement bonds.
TIA R7

well i do know salt kills concrete...one day emptied my bottom of my water softener onto my back porch and in a short time, had mush

i use urea for my driveway, would never use salt...it's fertilizer (nitrogen i think) you can get at feed mills and places like that...i pay about 12 bucks for a 50 lb bag but well worth it..also no harm to plants and melts snow very fast and wonderfully...

one thing, when you ask for it, get the bigger pellets, not the fine powdery stuff and when they ask what you want it for, say for melting snow...if you answer wrongly you may be considered a terrorist using that to make a bomb and i bet they have some sort of watch list or something

totally grateful..... thanks that is the solution i really needed.....