When filling the measuring bowl of the air meter, the concrete must be placed in _________ of equal depth.

When filling the measuring bowl of the air meter, placing the concrete in two layers of equal depth is essential to ensure an accurate measurement of the air content. This method helps in achieving uniformity and consistency in the filling process, which is critical for proper air content testing. The two-layer approach enables the concrete to be compacted effectively, minimizing voids and ensuring that the test results accurately reflect the air entrainment properties of the concrete mix.

Using two layers allows for optimal consolidation through tamping, which helps eliminate air pockets that might form if the concrete were placed in a single pour or layer. If the concrete were placed in a one-layer method or continuous pour, it could lead to inconsistent results and potentially misleading air content values, as the top and bottom layers may be compacted differently. Therefore, filling the bowl in two equal layers is the recommended practice for obtaining reliable and accurate measurements in air content testing.