Coastal and Floodplain Construction Inspector's Practice Exam

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What is the minimum diameter of cast in place deep foundation elements without a permanent casing?

  1. A. 10 inches

  2. B. 12 inches

  3. C. 8 inches

  4. D. 14 inches

The correct answer is: C. 8 inches

The minimum diameter for cast-in-place deep foundation elements without a permanent casing is established to ensure structural integrity and load-bearing capacity while also taking into account constructability and soil interaction. An 8-inch diameter is typically considered the minimum because it can provide adequate resistance to lateral loads and support for most typical structures while also being easier to construct as it allows for sufficient concrete flow and compaction during the pouring process. Using a smaller diameter could lead to difficulties in achieving proper installation or may compromise the overall load-carrying capacity in various soil conditions. In contrast, larger diameters, while valid choices, can often be unnecessary for many applications, potentially leading to increased costs and implementation complexities without providing significant additional benefits. Therefore, an 8-inch diameter represents a practical compromise, allowing for efficient construction while meeting the necessary engineering requirements.