Capillary suction and vapor diffusion is how it moves through concrete.
Is also why it is never a good idea to do built up floors over concrete in basements or applications like converted garages or carports. Even if you put a moisture barrier in, or use products with a moisture barrier on them such as the OSB product with the moisture barrier attached (garbage product), you will still have to remove the built up structure if moisture gets under it to properly dry it. Not to mention the moisture that gets trapped between the materials through capillary suction and vapor diffusion. It is inevitable that it will find its way in through this process alone. Paint and throw carpets (which can be dried/floated in place or rolled up and removed), ceramic tile are the only forgiving surfaces to promote in finished basements or over concrete in my book.
Just did a job two weeks ago where we tore out 100’s of sq ft of the OSB with the a moisture barrier attached. There was a 6 mil poly moisture barrier under that as well…and 2 inches of water that we could have never gotten to for a pump out or to introduce air and dehumidification. 55 yards of material. Wasted money. A washer hose failed.