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Use of electromagnetic non‐destructive techniques for monitoring water and chloride ingress into concrete
Author(s) -
Villain G.,
Ihamouten A.,
du Plooy R.,
Lopes S. Palma,
Dérobert X.
Publication year - 2015
Publication title -
near surface geophysics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.639
H-Index - 39
eISSN - 1873-0604
pISSN - 1569-4445
DOI - 10.3997/1873-0604.2015016
Subject(s) - ground penetrating radar , electrical resistivity and conductivity , chloride , dielectric permittivity , permittivity , geology , economic geology , electromagnetic radiation , core (optical fiber) , geotechnical engineering , dielectric , water content , hydrogeology , materials science , radar , mineralogy , composite material , engineering , optics , electrical engineering , optoelectronics , metallurgy , telmatology , telecommunications , physics
This paper deals with the use of three electromagnetic non‐destructive in situ techniques to assess concrete conditions: electrical resistivity, capacimetry, and ground‐penetrating radar. It shows the potential of these methods to monitor the ingress of water and chlorides into concrete. The electromagnetic properties that are studied here are dielectric permittivity and electrical resistivity, both sensitive to volumetric water content and chloride content. Results are presented from an experimental study conducted on concrete slabs (and corresponding core cylinders) in a controlled laboratory environment. Then, the discussion is focused on the ability of three electromagnetic techniques to assess the depth of the ingress front of different salt solutions and to discern between the 3 NaCl concentrations (0, 15 and 30 g/L).