Determination of the air content or porous component of concrete by weighing a concrete sample, with and without a water covering and after pressurization of the concrete to fill air holes with water

摘要

Method in which a concrete sample is weighed in a sealed container. It is then weighed again covered with bubble-free water. Finally the container, sample and water are pressurized, the water level returned to the level of the second weighing, the container hermetically sealed and the pressure source removed, before re-weighing. The first weight gives the weight of concrete, the second the weight of the concrete and water and the difference between second and third weights is a measure for the porous component of the concrete. An independent claim is made for a measurement device with a sample container (11) equipped with a sealing valve and a hydraulic connection for pressurizing of the container.