规定了通过观察压力变化时混凝土体积的变化来确定新拌混凝土空气含量的方法。该方法适用于由相对密实的骨料制成的混凝土和砂浆，其骨料修正系数可通过第5条所述的技术满意地确定。不适用于由轻质骨料、风冷高炉矿渣或高孔隙率骨料制成的混凝土。

Specifies a method for the determination of the air content of freshly mixed concrete from observation of the change in volume of concrete with a change in pressure. The method is intended for use with concretes and mortars made with relatively dense aggregates for which the aggregate correction factor can be satisfactorily determined by the technique described in clause 5. It is not applicable to concretes made with lightweight aggregates, air-cooled blast-furnace slag, or aggregates of high porosity.