Q: One of my workers walked on a parking deck too soon and left footprints in the concrete. There are a lot of prints, and they are very shallow but still visible. The owner wants them repaired so they aren't noticeable. Is there any way to do this economically?
A: You might be able to remove the footprints by shotblasting the affected areas of the deck. This will probably change the color and texture of the treated areas, but the owner might find the overall appearance more acceptable. Try consulting a contractor who does surface preparation for floor coatings. You can do a search for these contractors on the International Concrete Repair Institute's website www.icri.org.
Shotblasting could open the surface, though, and allow chlorides to penetrate the concrete more easily. Patching the footprints would probably make them more noticeable, and ensuring bond for such a thin repair is difficult, if not impossible. Because the footprints don't impair the structure's function, and repairs would likely leave something just as conspicuous, offering the owner a credit rather than trying to obliterate the footprints may be your best option.