Florida DOT Concrete Batchman/Operator Practice Exam

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What is the maximum allowable number of revolutions at mixing speed for concrete?

120 revolutions
160 revolutions
180 revolutions
200 revolutions

The correct answer is: 160 revolutions

The maximum allowable number of revolutions at mixing speed for concrete is set to ensure that the concrete is properly mixed without overmixing, which can lead to issues such as segregation or too much air being entrained in the mix. At 160 revolutions, the concrete is adequately mixed to achieve uniform consistency and workability while also minimizing the risk of any detrimental effects that can arise from excessive mixing. This limit is established in industry standards to balance the need for proper mixing with the maintenance of concrete quality, making it crucial for operators to adhere to these guidelines to ensure the integrity of the final product.