Florida DOT Concrete Batchman/Operator Practice Exam

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What is the maximum number of revolutions allowed for all concrete from truck mixers before discharge?

Two hundred revolutions
Three hundred revolutions
Four hundred revolutions
Five hundred revolutions

The correct answer is: Three hundred revolutions

The maximum number of revolutions allowed for all concrete from truck mixers before discharge is set at three hundred revolutions. This standard is in place to ensure that the concrete remains workable and retains its quality without beginning to set prematurely. Beyond this limit, the concrete may undergo excessive mixing, leading to issues such as segregation, loss of slump, or even a change in the properties of the concrete that could compromise its structural integrity. Maintaining the specified revolution limit helps to strike the right balance between mixing and the imminent setting of the concrete, ensuring the batch is delivered to the job site in optimal condition for use. Adhering to this guideline is vital in maintaining the performance characteristics of the concrete as specified in engineering plans and specifications.