T-molding is wooden or plastic molding that slides onto a metal track. When you look at the profile of the molding, it looks like a large T -- the top of the T faces outward, and the vertical portion of the T goes into the track. If you need to secure the track of your T-molding to concrete, you can do so with the use of concrete screws.
Place the track for the T-molding against the concrete and mark each mounting hole location. Place the T-molding track off to the side.
Drill a 5/32-inch hole into the concrete at each marked location with a masonry drill bit and a hammer drill. This is the correct pilot size hole for a 3/16-inch concrete screw. Drill at least 1/2 inch deeper than the length of the screws you plan to use.
Vacuum the holes out with a wet/dry vacuum cleaner to remove concrete debris from the hole.
Place the T-molding track onto the concrete and then thread the tips of your 3/16-inch screws with your fingers. Drive the screws into the concrete with a screwdriver.
Slide the T-molding onto the track.