The Torrent method measures the air-permeability of covercrete. i.e. the surface layer of the concrete. So it gives an indication of how resistant...

The Torrent method measures the air-permeability of covercrete. i.e. the surface layer of the concrete. So it gives an indication of how resistant the concrete is to gaseous contaminants. It is one of the few tests that can determine how well the concrete has been installed and compacted.