Florida DOT Concrete Batchman/Operator Practice Exam

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What is the air content range for all classes of structural concrete except Class IV Shaft?

0.50% to 2.00%
1.00% to 6.00%
2.00% to 4.00%
5.00% to 7.00%

The correct answer is: 1.00% to 6.00%

The air content range for all classes of structural concrete, with the exception of Class IV Shaft, is between 1.00% to 6.00%. This range is critical to the quality and performance of concrete, as it affects factors such as workability, durability, and resistance to freeze-thaw cycles. Having an appropriate amount of air in the concrete mix helps to improve its resistance to cracking and enhances its overall performance. While specific classes of concrete may require different air content ranges due to their intended application, the 1.00% to 6.00% range generally accommodates the structural needs for most classes, ensuring that the concrete remains robust while also being workable. The other options indicate air content ranges that are either too low or excessively high for structural concrete applications, which could compromise the material's integrity or performance. Therefore, understanding this standard range is essential for ensuring compliance with specifications and achieving lasting structural quality in concrete projects.