ACI Concrete Field Testing Technician - Grade I Practice Exam

What is the approximate volume of the measuring cup used to add water to the air meter relative to the air meter bowl's volume?

1. 0.50% ± 0.02%

2. 2.00% ± 0.05%

3. 1.00% ± 0.04%

4. 0.75% ± 0.03%

The correct answer is: 1.00% ± 0.04%

The correct answer reflects the standard measurement relating to the volume of water added to the air meter in relation to the volume of the air meter bowl. This is a crucial aspect of performing air content tests on fresh concrete. In concrete testing, the air content of the concrete mix is determined using an air meter, which requires a precise amount of water to be introduced into the meter bowl to facilitate the measurement process. The volume of water that is added must be controlled as it can significantly influence the accuracy of the air content measurement. The accepted standard for this relationship is that approximately 1.00% ± 0.04% of the air meter bowl's volume is taken by the measuring cup used for water addition. This ensures consistency and reliability in air content testing, adhering to the applicable testing standards. Understanding this percentage helps technicians ensure that the testing process is done correctly, contributing to the overall quality control in concrete production and testing.