After concrete is placed and initially screeded for superflat floors, workers use long aluminum straightedges to restrike the concrete. This process is repeated after each pass with a bullfloat.
Superflat floors typically are cast in long, narrow rows. Shown here, workers are making passes with ride-on trowels. Notice that the slab at the front of the photo has been scraped with bump cutters. For the first several finishing processes a floor is restraightened with bump cutters to ensure flatness.
Shown here, workers are working with bump cutters following a pass with a ride-on trowel. Notice the worker restraightening the edges also.