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AASHTO T 199

January 1, 2000

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Standard Method of Test for Air Content of Freshly Mixed Concrete by the Chace Indicator

Includes all amendments and changes through Reapproval Notice , 2009


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Description / Abstract:

This method of test covers the determination of the air content of freshly mixed concrete by displacing the air with alcohol and observing the change in level of the liquid in a tube. The apparatus is light and small, and the test procedure requires only a few minutes.

This method has been found satisfactory for determining the approximate air content of freshly mixed concrete. It shall not, however, be considered suitable for replacing T 121M/T 121 (gravimetric method), T 152 (pressure method), or T 196M/T 196 (volumetric method). In no case should the value obtained through the use of this method be accepted as determining the compliance of the air content of concrete with the requirements of specifications. The method is most useful for determining whether the concrete has a low, medium, or high air content, and whether the air content is reasonably constant from batch to batch of concrete.