ACI Practice Exam 2026 – Complete Resource for Test Prep

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Which action is not a step in the slump test procedure?

Remove the base before lifting

Rodding bottom layer at 1 inch

Add additional concrete during the slump test

Rotate the slump mold while lifting

The test relies on the concrete settling freely after the mold is lifted, so the measurement reflects its workability. To get a true slump, the mold must be raised straight upward, without any twisting or rotation. Rotating the slump mold while lifting would disturb the sitting concrete, smear the top surface, and produce an inaccurate height reading. The other steps described—rodding each layer to consolidate the concrete and not adding extra concrete during the test—are part of maintaining a consistent, valid procedure.