ACI Concrete Field Testing Technician - Grade I 2025 – 400 Free Practice Questions to Pass the Exam

When conducting an air content test using an air meter, it is crucial that the concrete sample is representative and free from any excess undisturbed material, which can interfere with the accuracy of the results. If a sample contains too much undisturbed material, such as large aggregates or clumps of concrete that have not been properly agitated or mixed, the test will not yield valid results.

Undisturbed material can prevent the air bubbles within the concrete from properly displacing water in the air meter, leading to an inaccurate measurement of the air content. Because of this interference, the integrity of the test is compromised, and it becomes necessary to repeat the test with a properly prepared sample. This ensures that the air meter functions effectively and provides a correct reading, reflecting the true air content of the concrete mix. Therefore, the correct course of action is to repeat the test under proper conditions to obtain valid results.