The corrosion of reinforced concrete is a worldwide problem but progress in developing a reliable method of surveying concrete structures has been slow. The half-cell monitor measures the potential of the reinforcement bar system with respect to a stable reference electrode, the magnitude of which is indicative of the presence of corrosion. This technique has been in use for twenty years but is very time-consuming and requires considerable expertise to interpret the data obtained. The Transport and Road Research Laboratory developed a microprocessor-based system with a multiple half-cell array which was subsequently marketed as the Colebrand Pathfinder, half-cells with a data logger and miniature printer. The equipment however was bulky and does not give corrosion rates so a collaborative project was set up with Liverpool University to improve the system. By measuring the resistivity of the concrete it was aimed to estimate the current flowing and calculate a rate of corrosion. Simultaneous improvements making the Pathfinder lighter and more compact have resulted in the development of Colebrand Half-Cell and Multicell Surveyor Units which can deal with a range of situations. The Multicell Surveyor interfaces with a portable ink jet printer, an IBM compatible PC or a colour printer.

  • Availability:
  • Corporate Authors:

    Palladian Publications Limited

    14 Park Street
    Windsor, Berkshire,   England 
  • Authors:
    • Hogg, R
  • Publication Date: 1989-9


  • English

Media Info

  • Pagination: p. 41-43
  • Serial:
    • Volume: 3
    • Issue Number: 7
    • ISSN: 0967-0726

Subject/Index Terms

Filing Info

  • Accession Number: 00604167
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Feb 28 1991 12:00AM