Concrete salts?

4 years ago
My house is 1 yr old and I have just noticed this white salt like substance leaching out of the mortar on the bricks under my sliding door. I have also noticed a white powder build up inside along the floor joining the same door. Flooring is vinyl plank, and immediately outside under the bricks I have a Patterned Concrete courtyard that was added about 4 months ago. Question is should I be concerned about this or is it normal process as the concrete slab settles in and dries out?

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