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American Concrete Institute (ACI) Practice Exam

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Tamping rod penetration into each layer should be approximately how deep?
Correct Answer:
about 1 inch
Explanation:
In a slump test, concrete is filled in layers and each layer is compacted with a tamping rod. The rod should penetrate into the underlying layer by about one inch. This depth provides sufficient consolidation of the current layer to remove air voids without disturbing or mixing with the layer below. If penetration is too shallow, the layer may not be adequately compacted, leading to an inaccurate slump. If penetration is too deep, you risk overworking and disturbing the lower layer, altering the reading. So, about one inch is the best choice.

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