Florida DOT Concrete Batchman/Operator Practice Exam

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Prepare for the Florida DOT Concrete Batchman/Operator Exam. Utilize our flashcards and multiple-choice questions with hints and explanations. Get ready to ace your test!

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What is FREE moisture in the context of aggregate?

The moisture within the aggregate
The water on the outside of the rock
Water mixed with cement
The moisture that evaporates

The correct answer is: The water on the outside of the rock

Free moisture, in the context of aggregate, specifically refers to the water that is present on the surface of the aggregate particles. This moisture is not absorbed into the aggregate but forms a thin film around it, which can impact the weight and strength of the concrete mix. Understanding free moisture is crucial for batch operators because it affects the accuracy of the mix design and the water-cement ratio, ultimately influencing the performance of the concrete. The other answers pertain to different aspects of moisture: moisture within the aggregate suggests absorption, which is not what free moisture defines; water mixed with cement refers to the mixing process and doesn't account for aggregate conditions; and moisture that evaporates describes a change in state rather than a specific condition of the aggregate. Hence, the concept of free moisture is best represented by the presence of water on the exterior of the aggregate.