What air content is required for concrete on Ohio DOT projects?

"Beams with hardened air contents below 4 percent will be rejected" [1] "Sample the concrete to perform the QC testing at the point of placement. Use the following quality control procedures during placement: a. Sample and test the air content on at least the first three (3) loads of concrete delivered for each day’s placement. Ensure the air content is within the specified parameters in Table 499.03 - 1 prior to extending the testing frequency to each sublot." [2] "If a load of concrete is tested and found to have an air content beyond the limits of Table 499.03 - 1 , do not accept and place that load unless it can be adjusted to be within the specified limits." [2] "When the Engineer determines concrete cannot feasibly be sampled at the point of placement, provide a trial placement of concrete to verify that the air content is within the limits of Table 499.03 - 1 ." [2]

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