Florida DOT Concrete Batchman/Operator Practice Exam

How many revolutions should each batch be initially mixed between at the batch plant?

1. Fifty and seventy

2. Sixty and eighty

3. Seventy and one hundred

4. Ninety and one hundred twenty

The correct answer is: Seventy and one hundred

The correct range for the number of revolutions for initially mixing each batch at the batch plant is between seventy and one hundred revolutions. This specific range is established to ensure that the concrete ingredients are adequately mixed to achieve uniformity and consistency throughout the batch. Proper mixing is essential for the quality of the concrete, as it helps in evenly distributing all components, such as aggregates, cement, water, and admixtures. Inadequate mixing can lead to segregation of materials and inconsistencies in the final product, potentially compromising the strength and durability of the concrete. The recommended revolutions allow for sufficient mixing time without over-mixing, which can cause excessive air entrainment or affect the concrete's workability. Understanding the correct number of revolutions is crucial for batch operators to maintain quality standards outlined by industry guidelines and specifications. Therefore, the choice indicating seventy to one hundred is aligned with best practices in concrete batch production.