Which term is a thin steel shell used in the placement of cast-in-place concrete piles?

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Multiple Choice

Which term is a thin steel shell used in the placement of cast-in-place concrete piles?

Explanation:
In cast-in-place piles, a mandrel is the thin steel shell placed inside the pile form to define and support the inner void or lumen as concrete is poured. It acts as temporary formwork that keeps the inner diameter true and prevents concrete from filling unwanted spaces, which is especially important for hollow or duct piles. Depending on the design, the mandrel may be withdrawn after the concrete gains strength or left in place to form a duct. The other terms aren’t related to pile forming: a masonry plate is used in masonry work, maintenance of traffic pertains to traffic control, and PVI refers to a vertical survey point.

In cast-in-place piles, a mandrel is the thin steel shell placed inside the pile form to define and support the inner void or lumen as concrete is poured. It acts as temporary formwork that keeps the inner diameter true and prevents concrete from filling unwanted spaces, which is especially important for hollow or duct piles. Depending on the design, the mandrel may be withdrawn after the concrete gains strength or left in place to form a duct. The other terms aren’t related to pile forming: a masonry plate is used in masonry work, maintenance of traffic pertains to traffic control, and PVI refers to a vertical survey point.

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