Wife flooded utility room – now concrete won't dry?

My wife allowed our utility sink to overflow and spill a ton of water on the concrete utility room floor. While all of the water is gone, the floor still looks wet and you can see the outline of how far the water crept. I have never had any issues with wetness or flooding in my home, but cannot figure out what is going on. The floor feels the same as the surrounding "dry" concrete. Maybe just slightly damp, but almost imperceptible if it is. Does anyone have any ideas what is going on here?

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