A common problem with concrete floor slabs is loss of the top surface. This failed surface is seldom more than 1/8 inch thick, but the integrity and increased density produced by hard troweling is lost as this thin layer delaminates. The rough remaining surface is no longer suitable for motorized traffic.
Little can be done to ameliorate the situation once it has occurred. Repair typically consists of application of a skim coat of a polymeric mortar or complete removal and replacement of the slab. Both are very expensive.