BS EN 12350-7 is the seventh part of the multi-series standard which discusses the air content pressure methods for testing fresh concrete.
BS EN 12350-7 describes two methods for the determination of air content of compacted fresh concrete, made with normal weight or relatively dense aggregate and having a declared value of D of the coarsest fraction of aggregates used in the concrete (Dmax) not greater than 63 mm.
Note-
Neither method applies to concretes made with lightweight aggregates, air-cooled blast-furnace slag, or aggregates with high porosity, because of the magnitude of the aggregate correction factor, compared with the entrained air content of the concrete.
BS EN 12350-7 on-air contents pressure methods for testing fresh methods are applicable for:
As the pressure rises the concrete becomes compressed and the water level in the graduated cylinder falls. When the pressure has reached a specified level, the reading of the water level is recorded. The pressure is then released and the water level rises. The difference between the two levels is the apparent air content.
BS EN 12350-7 provides you with the guidance where there are two test methods, in which both apparatuses are used to employ the principle of Boyle-Mariotte's law. These two methods are referred to as the water column method and the pressure gauge method and the apparatus as a water column meter and a pressure gauge meter.
BS EN 12350-7:2019 supersedes BS EN 12350-7:2009, which is withdrawn. It includes:
EN 12350-7