Details

Autor(en) / Beteiligte

• Badr, Joanna
• Fargier, Yannick
• Palma-Lopes, Sérgio
• Deby, Fabrice
• Balayssac, Jean-Paul
• Delepine-Lesoille, Sylvie
• Cottineau, Louis-Marie
• Villain, Géraldine

Titel

Design and validation of a multi-electrode embedded sensor to monitor resistivity profiles over depth in concrete

Ist Teil von

• Construction & building materials, 2019-10, Vol.223, p.310-321

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •Design of an embedded sensor to monitor concrete resistivity profiles.•The designed solution is a multi-electrode printed circuit board (PCB) sensor.•Numerical validation of the sensor was performed.•Validation of the sensor in solutions of known conductivity.•Validation of the sensor in concrete to monitor concrete drying. Electrical resistivity is sensitive to various properties of concrete, such as water content. Usually used on the surface of old structures, devices for measuring such properties could also be adapted in order to be embedded inside the constitutive concrete of the linings of new tunnels or in new bridges, to contribute to structural health monitoring. This paper introduces a novel multi-electrode embedded sensor for monitoring the resistivity profile over depth in order to quantify concrete durability. The paper focuses on the design of the sensor as a printed circuit board (PCB), which brings several advantages, including geometric accuracy and mitigation of wiring issues, thus reducing invasiveness. The study also presents the numerical modeling of the sensor electrical response and its ability to assess an imposed resistivity profile, together with experimental validations using (i) saline solutions of known conductivity and (ii) concrete specimens subjected to drying. The results demonstrate the capability of the sensor to evaluate resistivity profiles in concrete with centimeter resolution.