AS 1012.4.2:2014

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.

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

Originated as part of AS 1012.4-1983.
Previous edition AS 1012.4.2-1999.
Revised and designated as AS 1012.4.2:2014.