How to Shot Blast Concrete Floors

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Shot blasting concrete is using a machine which delivers a combination of high-pressure sand and water to remove paint, grime, graffiti, and other materials. Shot blasting a concrete floor requires a little finesse and some practice. Once an operator gets the hang of using the machine, cleaning or stripping concrete floors with a shot blaster becomes much simpler. Caution should be used when operating a shot blaster to avoid bodily injury and damage to the flooring.

Things You'll Need

  • Duct tape
  • Eye protection
  • Ear plugs
  • Dust mask
  • Gloves
  • Heavy boots
  • Stretch duct tape around the sand-suction hose. This will prevent clogging by suspending the hose away from spray-gun lance. If you do not tape the hose up, water can get into the sand-suction hose and clog up the sand.

  • Put on heavy boots, eye protection, gloves, ear plugs, and a dust mask. Place the induction probe in the sand reservoir. Close off the reservoir with duct tape. Connect the water supply to the machine and turn the water on. Depress the shot blaster's trigger to bleed any air out of the line. Then, turn the machine on.

  • Adjust the pressure setting on the shot blaster according to the concrete floor's needs. Start with a low setting and test clean an area of the concrete floor to see if the machine quickly and adequately takes up the paint, grease, or whatever it is you are trying to remove. Increase the pressure setting incrementally until the machine's performance is satisfactory.

  • Walk in a linear motion across the concrete floor. Starting at the furthest corner in the room and going toward the entryway. Walk slowly and observe the floor as you shot blast. You may have to make several passes over the concrete floor to completely clean it.

References

  • "Concrete Structures: Protection, Repair and Rehabilitation"; Roger Dodge Woodson; 2009
  • "Guide to Concrete Repair"; Glenn Smoak; 2002
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