Florida DOT Concrete Batchman/Operator Practice Exam

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What should the result be when you adjust for free moisture?

Increase in additive materials
Decrease in water weight
Increase in aggregate weight
Change in the mix design

The correct answer is: Decrease in water weight

When adjusting for free moisture in a concrete mix design, the intended result is typically a decrease in the water weight. Free moisture refers to the moisture present in the aggregates that is not absorbed by the particles and can affect the overall water-cement ratio. In this context, when free moisture is accounted for, it indicates that the aggregates contain additional water that contributes to the total mix water. To maintain the desired water-cement ratio and ensure the concrete achieves its intended strength and workability, the amount of added water in the mix must be reduced. This adjustment helps ensure that the concrete mix contains the right amount of water for proper hydration without exceeding the levels that might lead to weaker concrete or other issues. Adjustments related to free moisture are critical to the consistency and quality of the final concrete product, emphasizing the need for accurate measurements and adjustments in the mixing process to account for moisture present in aggregate materials.