Florida DOT Concrete Batchman/Operator Practice Exam

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After materials have been discharged into the transit mixer, how many revolutions must the concrete be mixed before leaving for the project?

  1. 50 to 70 revolutions

  2. 70 to 100 revolutions

  3. 100 to 130 revolutions

  4. 130 to 160 revolutions

The correct answer is: 70 to 100 revolutions

The correct answer indicates that after materials have been discharged into the transit mixer, mixing should occur for a range of 70 to 100 revolutions prior to heading to the project site. This amount of revolutions is crucial for ensuring that the concrete achieves a uniform consistency and proper hydration of the cement. Adequate mixing helps to eliminate any segregation of components, such as aggregates and cement, which can occur if the mixing is insufficient. It also ensures that all ingredients are thoroughly incorporated, leading to the expected strength and durability in the final concrete product. In practice, mixing concrete in this range allows for a balance between achieving the desired workability and preventing over-mixing, which can negatively impact the concrete's properties. Mixing past the required point can lead to reduced workability and an increase in the water-cement ratio, ultimately diminishing the concrete's performance on site. Therefore, following the guidelines for the specific revolutions is vital for delivering high-quality concrete that meets project specifications.