Design and implementation of embedded sensors based on electrical resistivity to determine water content profiles in thick concrete structures
Résumé
The French national radioactive waste management agency (Andra) aims to insure the
durability of thick concrete structures used for waste repository. To this end, concrete
water content is one of the main parameters governing the long-term durability of these
structures, therefore an accurate estimation of its profile is important. This research
focuses on an electrical resistivity technique, which is highly sensitive to the water
content in concrete.
Our work aims to design a prototype of embedded sensors in concrete structures to
measure the resistivity profile with depth and the water content profile after calibration.
The study highlights the capability of different types of sensors to measure the
resistivity profile of a 30cm-thick concrete section. Several numerical studies are
conducted to design different possible configurations of the embedded sensors and to
optimize the sensors geometry in order to obtain the most relevant configuration.
Several types of sensors are tested on small specimens; for instance Wenner type
(aligned and equidistant four-pin probe resistivity method), proved capable of
identifying the resistivity profile. The methodology for observing, measuring and
monitoring the resistivity profile over time is studied.
Domaines
Sciences de l'ingénieur [physics]
Origine : Fichiers produits par l'(les) auteur(s)