scope:

This Standard specifies the method for determining the air content of fresh concrete through reduction of pressure in air chamber. This Standard is applicable to concrete made with ordinary aggregate of which the maximum aggregate size is 40 mm or smaller. It is not applicable to concrete made with porous aggregate such as artificial lightweight aggregate for which the aggregate correction factor cannot be accurately determined. The water-column method is provided in Annex A (informative).

NOTE 1 The test method specified in this Standard employs the principle of Boyle's law.

NOTE 2 The air chamber method is carried out either with or without water injection.

NOTE 3 The International Standard corresponding to this Standard and the symbol of degree of correspondence are as follows.

ISO 1920-2 : 2016 Testing of concrete - Part 2 : Properties of fresh concrete (MOD)

In addition, symbols which denote the degree of correspondence in the contents between the relevant International Standard and JIS are IDT (identical), MOD (modified), and NEQ (not equivalent) according to ISO/IEC Guide 21-1.