Arizona · answered by Verika · verified against sources
What air content is required for concrete on Arizona DOT projects?
For Arizona DOT projects, concrete placed at elevations 3,000 feet or above must have an air content of 4–7% (if freeze-thaw concern exists) or 5–8% (if freeze-thaw concern exists and concrete is pumped). Below 3,000 feet, air entrainment is optional, with a max of 7% if used. [2,6]
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