Comparison of nondestructive testing: Infrared thermography, electrical resisitivity and capacity methods for assessing
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Colette Sirieix is a doctor of science. She first worked in BRGM and ANTEA companies, and became an associate professor at Bordeaux 1 University (CDGA, France) in 1997. She is a specialist in geophysics: infrared thermography and electrical resistivity methods. Her research deals especially with the characterisation of rocks and concrete damage. She is a member of RGCU, SENSO French programmes and EAGE.
Jean François Lataste is associate professor in University Bordeaux 1, after obtaining a PhD dealing with the assessment of electrical resistivity on concrete structures. His works in the laboratory CDGA (now becoming GHYMAC) are on material electrical properties, on the building materials and applied geology fields. He participates in the RILEM TC INR.
Denys Breysse has carried out research works that are mainly focused on the consequences of heterogeneities in soils and building materials on the assessment of the construction properties and reliability. Fields of application are in soil–structure interaction, maintenance and management of technical assets and in nondestructive assessment of concrete. Presently, he is the chairman of RILEM TC INR-207 on combination of nondestructive techniques for assessment of concrete. He is also President of the French Association of Universitarian Research (AUGC).
Samuel Naar has made his master speciality geophysics at Rennes University. His PhD was on infrared thermography and electrical resistivity techniques, for nondestructive testing of concrete structures. He has prepared it with the University Bordeaux 1 (CDGA) in France, and with Sherbrooke University (Département de Génie Civil) in Quebec. He has been working for a few months for the company Concrete, dealing with structure damage assessment and rehabilitation.
Xavier Dérobert is a senior scientist at LCPC (FR), and has been a specialist in ground-penetrating radar (GPR) for over 15 years in civil engineering. He received an Engineer of State Public Works diploma in 1987, a PhD in electromagnetism in 1995 and a ‘Leading Research Ability’ diploma in 2003. He is the author of more than 50 publications/communications in the NDT field and organised two national conferences on GPR in 2001 and 2003. Correspondence: Colette Sirieix, CDGA Université Bordeaux 1, Avenue des Facultés, 33 405 Talence cedex, France; Tel: + 33 540 00 87 97; Fax: + 33 540 00 31 13; E-mail: [email protected]
Abstract A series of investigations were carried out on a precast concrete duct in Tarbes, France, which displayed damage patterns. The aim of the study was to rank 55 similar pipe segments in order to determine severity of the damage. The methods used were electrical resistivity measurement, passive infrared thermography and the capacitor method. The first step was to clarify the accuracy of the site measurements of the various techniques in a real situation. All methods allowed water content rate variations and cracks to be distinguished on the surface of concrete. Statistical analysis of the data helped
© 2007 PALGRAVE MACMILLAN
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