Air Content: Volumetric Method
ACI Technician Workbook CP-1

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CALIBRATED CUPS

1 Calibrated Cup = 1 Percent Air

A calibrated cup is used when the water level falls below the neck on the air meter while running the test. If this happens, either the concrete contains a significant amount of air, or your apparatus has leaked during the test.

Add calibrated cups of water to bring the water level up into the neck so its level can be measured. Record the number of cups added, and add to the final air content at the end.

Example: 9% air reading + 2 calibrated cups added during the test = Final reading of 11% air entrainment.

Air Entrainment: Air has been intentionally added to the mix (typically readings above 3%)

Air Entrapment: Naturally occurring air in the concrete mix (typically from 1 to 3%)

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