How to Grind Cement

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Grinding cement or concrete is a dirty and difficult task. By following a set of steps with the right equipment, you can grind cement to be used for everything from creating a terrazzo floor to fixing a toe-stubber in the sidewalk.

Things You'll Need

  • Variable speed right-angle grinder with a 5/8-11 thread count arbor
  • Diamond cup wheel
  • Diamond blade sized to the grinder
  • Carbide rubbing block
  • 5-inch, 5/8-11 thread Velcro backer pad
  • 5-inch diamond polishing pads - 60, 120, 220, 400, 600 grit
  • GFCI cord connection
  • Spray bottle or water hose
  • Squeegee
  • Dust mask, eye protection, ear protection, gloves
  • Shop vacuum
  • Flood the area to be ground with water and aggressively begin rubbing it with the carbide rubbing block in a circular motion. After a few minutes, wipe the slurry away with a squeegee or sponge to check your progress. This process works on shallow surfaces, such as a spill of concrete, a crack that has shifted to create an uneven section or a terrazzo finish.

  • Grind deeper surfaces using the cup on the angle grinder at a medium speed, and increase speed as you gain comfort operating the tool. Slightly angle the tool into the work to cut in and flatten it back out as you move along; don't try to grind the entire depth all at once, especially if it is very thick. Wear a dust mask and protection for your eyes, ears and hands.

  • Wet the surface slightly and begin polishing with the 60-grit pad. Because the area should stay wet to keep the pad cool, use a GFI on your cord to keep water from getting into the grinder. Wash the surface off before it dries after you are finished polishing.

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