Shrinkage and Temperature Reinforcement (ACI 318-19 24.4)
Minimum shrinkage/temperature steel perpendicular to the main bars in a one-way slab: ratio 0.0018 (Grade 60) or 0.0020 (Grade 40/50), As,min = ratio x b x h, spacing <= min(5h, 18 in). A 6 in slab, Grade 60 -> 0.130 in^2/ft, 18 in max (about #4 at 18). A design aid; the engineer of record's stamped design governs.
Formula and source
ratio = 0.0018 (Grade 60) or 0.0020 (Grade 40/50), never below 0.0014; As,min = ratio x b x h; s_max = min(5h, 18 in).
The ACI 318-19 24.4 shrinkage and temperature reinforcement provisions, by name.
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