Sealer
You can seal them if you like with any masonry (concrete) sealer
Home Depot and Lowes, paint store, etc....
Be sure that the efflorescence (white chalky material) has bled out of the surface. Usually takes 3 months from installation.
The same way sealers keep stuff out...they keep stuff IN.
When you seal, if you have sand in the joints, don't be afraid to seal that also. It will fortify the whole area. Just roll away!
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