The engineer selects a design methodology to keep the floor flat with time. Possible design options include use of post-tensioning, shrinkage-compensating concrete, increased non-prestressed reinforcement (about 0.5 to 0.6 percent instead of the typical 0.1 percent), macrofibers in the dosage range of 3 to 4 kg/m3 (5 to 7 lb/cy), concrete drying shrinkage limits, and shrinkage-reducing admixtures (SRAs)—or a combination of these alternatives.
