ACI Concrete Field Testing Technician - Grade I Practice Exam

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Prepare for the ACI Concrete Field Testing Technician - Grade I Exam with interactive quizzes and detailed study materials. Each question is designed to enhance your understanding of concrete testing standards and procedures.

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What happens to the air meter if the concrete sample contains too much undisturbed material?

It must be recalibrated
It will give a lower reading
The test must be repeated
It is considered valid

The correct answer is: The test must be repeated

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.