ACI Concrete Field Testing Technician - Grade I Practice Exam

What is the main purpose of the air meter test method in concrete field testing?

1. To determine concrete compressive strength

2. To measure the air content in fresh concrete

3. To assess the workability of concrete

4. To evaluate the temperature of the concrete mix

The correct answer is: To measure the air content in fresh concrete

The primary objective of the air meter test method is to measure the air content in fresh concrete. This test is crucial because the amount of air entrained in the concrete mix plays a significant role in enhancing the durability and workability of the concrete. Air-entrained concrete can resist freeze-thaw cycles, which is particularly important in cold climates. By determining the air content, testers can ensure that the concrete has the desired properties for its intended use, reducing the risk of cracking and failure. While the other options pertain to important aspects of concrete testing, they do not capture the main purpose of the air meter test. For instance, assessing compressive strength, workability, or temperature are conducted through different testing methods, such as cylinder breaking, slump tests, or thermometers, respectively. Therefore, measuring air content is the specific focus of this test method.