Comparative determination of the air content in fresh concrete with 5 litre and 8 litre air content testers

摘要

In the context of concrete testing the air content is an important parameter of the fresh concrete to be compacted. In Germany it is usually determined by the pressure equalization method described in DIN EN 12350-7. Air content testers with a nominal volume of 8 litres, which were adopted from the test specification in the now superseded DIN 1048, are normally used in building practice for testing the air content. The current standard permits the use of air content testers with nominal volumes of 5 litres and above, so comparison tests were carried out with an 8 litre air content tester of the type normally used in practice and an air content tester of basically the same design with a nominal volume of 5 litres.