Scope

This Standard sets out the method for determining the air content of freshly mixed concrete
from observations of the reduction in air pressure in a chamber above the concrete when the
concrete is exposed to the air pressure (see Note 1). When performed for quality control
purposes such as for plant production testing or for mixer uniformity tests, the apparent air
content only may be sufficient. The air content shall be determined when specified.
The results obtained are dependent on the compaction method used. This Standard provides
for compaction of the sample by rodding or by vibration or by using self compacting
concrete (SCC) placed in the bowl.
NOTES:
1 This Standard is intended for use with concretes made with relatively dense natural
aggregates for which the aggregate correction factor can be determined satisfactorily by the
technique described in Clause 9. It is not recommended for use with concretes made with
lightweight aggregates, or aggregates of high porosity (see AS 1012.4.3).
2 This Standard may involve hazardous materials, operations, and equipment. The Standard
does not purport to address all of the safety problems associated with its use. The user of this
Standard should establish appropriate safety and health practices and determine the
applicability of regulatory limitations prior to use.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	Standards Australia
Pages
ISBN
Committee	BD-042
Supersedes	AS 1012.4.2-1999 DR AS 1012.4.2 CP