Using Air Permeability for Concrete Quality Surveys

April 25, 2014

The permeability of concrete to liquids, aggressive ions and gases is of direct relevance to durability and the long-term performance of concrete structures in-service.  TORRENT - Application - 1

The Concrete Society Technical Report TR31 defines permeability as ‘that property of a porous medium which characterises the ease with which a fluid will pass through it, under the action of a pressure differential’.

There are several types of permeability test equipment available to classify concrete structures in-service but the Proceq Torrent Permeability Tester is an effective and easy to use system.  The air permeability coefficient kT can be readily established for dry concrete with the Torrent system and the quality class of the concrete determined from the manufacturer’s nomogram.

The Torrent Permeability Tester is typically used for:

  • Investigations and surveys on new and existing structures including bridges, tunnels, reservoirs and water-retaining structures;
  • Assessment of the quality of repair mortars;
  • Measuring the effect of surface treatments on exposed structures.

Our engineers have used the Torrent system on several types of liquid retaining structures and for more information on the permeability testing, please contact Dr Thomas Callanan in Infrastruct Asset Management Service Limited.