This test method covers determination of the air content of
freshly mixed concrete from observation of the change in volume of
concrete with a change in pressure.
This test method is intended for use with concretes and mortars
made with relatively dense aggregates for which the aggregate
correction factor can be satisfactorily determined by the technique
described in Section 6. It is not applicable to concretes made with
lightweight aggregates, air-cooled blastfurnace slag, or aggregates
of high porosity. In these cases, Test Method C 173/C 173M should
be used. This test method is also not applicable to nonplastic
concrete such as is commonly used in the manufacture of pipe and
concrete masonry units.
The text of this test method references notes and footnotes that
provide explanatory information. These notes and footnotes
(excluding those in tables and figures) shall not be considered as
requirements of this standard.
The values stated in inch-pound units are to be regarded as
standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and
are not considered standard.
This standard does not purport to address all of the safety
concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use. (Warning—Fresh
hydraulic cementitious mixtures are caustic and may cause chemical
burns to skin and tissue upon prolonged exposure.)2
*A Summary of Changes section appears at the end of this
2 Section on Safety Precautions, Manual of Aggregate
and Concrete Testing, Annual Book of ASTM Standards, Vol
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