FDOT Concrete Field Inspector Specification Practice Exam

What should be checked to ensure air content aligns with the mix design?

Mix design and testing to ensure proper microscale air voids; dosed per design. Only the color of the cement. The weather forecast for the day. The size of the project crew.

Correct Answer:

Mix design and testing to ensure proper microscale air voids; dosed per design.

Explanation:

Air content and the microscale air void system determine how durable the concrete will be, so the field check must confirm that the mix design’s targets are actually achieved. The mix design specifies a target air content and the corresponding dosage of air-entraining admixture to produce the intended number, size, and spacing of air voids. In practice, you verify that the batch was dosed per that design and that the measured air content falls within the design’s specified range. The proper microscale air voids—those tiny, well-distributed voids that help resist freeze–thaw—depend on getting the admixture dosage and mixing right, so alignment with the design ensures the intended performance. Things like color, weather, or crew size don’t influence this aspect of the mix.

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