Florida DOT Concrete Batchman/Operator Practice Exam

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When calculating the Air % in a concrete mix, how is absolute volume of Air determined?

(Air % / 100) * 27
(Air % * 100) / 27
(Air % + 100) * 27
(Air % - 100) / 27

The correct answer is: (Air % / 100) * 27

The absolute volume of air in a concrete mix is determined by using the formula (Air % / 100) * 27. This formula is based on the concept of converting the percentage of air content into a volume measurement within a cubic yard of concrete, which is 27 cubic feet. To understand why this formula is appropriate, consider that the Air % reflects the portion of the total volume that is air. By dividing the percentage by 100, you convert it from a percentage to a decimal. Multiplying this decimal by 27 gives you the actual volume of air in cubic feet for a specific volume of concrete (1 cubic yard, or 27 cubic feet). This calculation is essential for ensuring that the concrete mix has the desired air content for properties such as workability, durability, and resistance to freeze-thaw cycles. The alternative choices do not properly represent the relationship between air percentage and volume measurement relevant to concrete design, making them unsuitable for determining the absolute volume of air accurately.