American Concrete Institute (ACI) Practice Exam

If the concrete sample is to be consolidated by rodding, the measure is filled in _____ layers.

3 2 4 5

Correct Answer:

Explanation:

When consolidating concrete by rodding, the mold is filled in three equal layers. This approach ensures air is expelled progressively and the concrete is compacted uniformly throughout the height of the specimen, reducing voids and achieving a true, level top surface after tamping. Each layer is compacted with the tamping rod (commonly about 25 strokes per layer), which helps push the aggregate together and eliminate gaps between layers. Filling in three layers is the standard practice for rodding to produce consistent, repeatable test cylinders.

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