I'll concede parge to an extent. I have 17 different dictionaries. It appears in three. I must have only checked the other 14.

Aaron, cement is in mortar, mortar isn't in cement. Mortar is a mix of portland cement, hydrated lime and clean sharp sand. The cement to lime ratio determines the type of mortar.

I agree, tapping on the forms may have filled the voids. The reason they're at the form interface is there were no other irregular shaped objects to fill them: forms are flat, aggregate isn't. It's HIGHLY unlikely that the voids are elsewhere in the slab.

I'm not in NC, the poster of the question is in NC. I'm in Rochester, NY. We have freeze thaw cycles. Here, I'd suggest filling the voids to avoid an improbable, but possible issue.

In NC the issue is entirely cosmetic.

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Chad Fabry, Rochester, NY
StructureSmart Home Inspections, Inc.
www.structuresmart.com