AS 1012.4.1:2014

This Standard sets out the method for determining the air content of freshly mixed concrete from observations of the change in volume of the concrete when it is subjected to an increased air pressure.

This Standard sets out the method for determining the air content of freshly mixed concrete from observations of the change in volume of the concrete when it is subjected to an increased 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 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: 1This method 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 10. It is not recommended for use with concretes made with lightweight aggregates, or aggregates of high porosity (see AS 1012.4.3).2This 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.

Originated as part of AS 1012.4-1983.
Previous edition AS 1012.4.1-1999.
Revised and designated AS 1012.4.1:2014.