Join Date: Jan 2007
Location: Home of the Hawkeyes
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Assuming this isn't an articulated mount and has a conventional four hole mounting pattern. If so, may I suggest using a 5/16" or larger - 5" long Tapcon cement anchor screw that threads through both the stud and into the cement for the two upper mounting points. You'll need a small hammer drill for the pilot hole and a masonry bit of appropriate diameter and length.
You can use shorter lags on the two lower mounting points since they aren't subjected to the same forces.
If the cement construction is block with hollow cavities that you happen to hit, I would switch to a toggler type anchor and a 6" long 1/4" machine screw to enable insertion through the extra depth.
This mounting type will require a 1/2" diameter hole through all materials to the cavity.