Measurement and visualisation of the actual concrete resistivity in consideration of conductive layers and reinforcement bars

Author(s): K. Reichling, M. Raupach
Paper category: Conference
Book title: Concrete Repair, Rehabilitation and Retrofitting III (ICCRRR)
Editor(s): M.G. Alexander, H.-D. Beushausen, F. Dehn, P. Moyo
Print ISBN: 978-0-415-89952-9
Publisher: Taylor & Francis Group
Pages: 258- 259
Total Pages: 2
Language: English

Abstract: 
The resistivity of concrete is a major factor regarding the durability of reinforced concrete structures. In combination with a suitable calibration the values may be correlated e.g. to the permeability, the water content of the concrete and the corrosion rate of the reinforcement. However, typical measurement techniques based on four electrodes allow a determination of an apparent resistivity which usually differs from the actual resistivity of the concrete. The major influencing effects are given by surface near layers with a different resistivity compared to the bulk concrete (e.g. due to carbonation or wetting) as well as steel reinforcement. For the evaluation of the actual concrete resistivity the applicability of the Electrical Resistivity Tomography (ERT) has been discussed. By means of this method the resistivity distribution of the concrete section could be determined and illustrated graphically which allows an identification of layers and components with different resistivities.

Online publication: 2014
Publication Type: abstract_only
Public price (Euros): 0.00