ACI Concrete Field Testing Technician - Grade I Practice Exam

If the slump mold is too wet before use, it should be dried completely. This is important because the presence of excess moisture within the mold can influence the results of the slump test. Adding water from a wet mold to the concrete can alter the water-to-cement ratio, leading to inaccurate test results. Ensuring that the mold is dry helps maintain consistency and reliability in measuring the workability of the concrete mix being tested. Proper preparation of the slump mold is crucial to adhere to standardized testing procedures, which ensures that the results reflect the true properties of the concrete mix.

The other actions do not adequately address the problem of excess moisture and could compromise the integrity of the testing process. Using a mold as is when it's wet may skew results, filling it with concrete could compound the issue, and rinsing it with water would simply increase the wetness. Therefore, drying the mold completely is the most appropriate action to ensure accurate slump testing.