What action should be taken if the concrete level drops below the top of the slump mold?

When the concrete level drops below the top of the slump mold, adding more concrete and scraping off the excess is the appropriate action to take. This ensures that the mold is properly filled to the required height, which is essential for an accurate slump test result. The slump test is designed to measure the consistency and workability of the concrete mix, and an accurate reading depends on the concrete being at the correct level within the mold.

By adding more concrete, you are compensating for the drop and maintaining the integrity of the test. Scraping off the excess also prevents any discrepancies that could skew the results, as any additional concrete above the mold’s top edge could lead to an inaccurate slump measurement. This method adheres to proper testing protocols, ensuring that the slump reflects the true consistency of the concrete being evaluated.