Florida DOT Concrete Batchman/Operator Practice Exam

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What is the minimum period that the surface of coarse aggregate must be sprinkled with water before introduction into concrete?

12 hours
24 hours
36 hours
48 hours

The correct answer is: 24 hours

The minimum period for sprinkling the surface of coarse aggregate with water before it is introduced into concrete is 24 hours. This practice is essential to ensure that the aggregates are adequately saturated, which helps prevent them from absorbing moisture from the concrete mix. If the coarse aggregate is dry when added to the mix, it can lead to a decrease in water available for hydration, which in turn affects the concrete's overall strength and durability. By allowing 24 hours of moisture soaking, the aggregate reaches a proper state of saturation without contributing excess water to the mix, which can lead to issues such as segregation and reduced workability. This soaking period aids in achieving a more consistent and high-quality concrete, ensuring optimal performance of the final product.