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AASHTO T 356-15
- Standard Method of Test for Determining Air Content of Hardened Portland Cement Concrete by High-Pressure Air Meter
- standard by American Association of State and Highway Transportation Officials, 2015
- Publisher: AASHTO
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This test method covers laboratory determination of the air content of hardened portland cement concrete with the use of the high-pressure air meter. This determination is made from the observation of change in linear piston movement with a specimen in the test chamber from that of the linear piston movement with no specimen in the test chamber. This change is due to a replacement of specific volume of compressible air by a specific volume of incompressible water.