ACI Concrete Field Testing Technician - Grade I Practice Exam

Is it acceptable for the interior surface of the slump mold to have minor irregularities?

1. True

2. False

3. Only if they do not affect the test

4. Only if the mold is new

The correct answer is: False

The correct answer to whether it is acceptable for the interior surface of the slump mold to have minor irregularities is that it is not acceptable for such conditions. The integrity of the slump test relies on the consistency and accuracy of the mold used during the test. Minor irregularities can potentially influence the behavior of the concrete as it is being tested, leading to inaccurate results. Using a mold that is consistent and free of defects ensures that the slump measurement reflects the true workability and flow characteristics of the concrete mix. If the interior surface of the mold is not uniform, it may create inconsistencies in how the concrete settles or flows within the mold, which can skew the test results. In this context, it’s crucial that the molds are well-maintained and free from any wear or defects that could impact the testing process. Maintaining strict quality control of testing equipment, including molds, is essential for achieving reliable and valid test outcomes in concrete field testing.