Florida DOT Concrete Batchman/Operator Practice Exam

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What is the acceptable percentage range for cement replaced with fly ash in drill shaft concrete?

10% to 15%
20% to 25%
33% to 37%
40% to 50%

The correct answer is: 33% to 37%

The acceptable percentage range for cement replaced with fly ash in drill shaft concrete is typically between 33% to 37%. This percentage is significant because incorporating fly ash as a partial replacement for cement can enhance the durability and workability of the concrete, while also reducing the heat of hydration and the carbon footprint of the concrete mix. Fly ash can improve the long-term strength and resistance of concrete to various environmental factors. When using fly ash, it is essential to adhere to specified guidelines to ensure that the concrete maintains the necessary performance characteristics for structural applications, such as drill shafts. The range of 33% to 37% reflects a balance between maximizing the beneficial properties of fly ash and ensuring that the mechanical properties of the concrete are not compromised. Other ranges either do not align with industry standards or may lead to performance issues in the mix, making the specified percentage range crucial for the successful application of drill shaft concrete.