JIS A 1128:2019规定了通过降低空气室中的压力来确定新拌混凝土空气含量的方法。本标准适用于由最大骨料粒径为40mm或更小的普通骨料制成的混凝土。它不适用于由多孔骨料制成的混凝土，例如骨料修正系数无法准确确定的人造轻骨料。水柱法见附录A（资料性附录）。

JIS A 1128:2019 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).