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The development and combination of electromagnetic non-destructive evaluation techniques for the assesment of cover concrete condition prior to corrosion

Abstract : Electromagnetics (EM) non-destructive evaluation techniques are sensitive to parameters related to the durability of concrete. This research project investigated the potential of electromagnetic techniques to assess concrete durability and detect the presence of harmful agents (i.e moisture and chloride). The combination of three in situ electromagnetic techniques to assess concrete condition was also shown to have great potential. The first phase in this research project comprised a parametric study to assess the sensitivity of the different electromagnetic observables to concrete condition. Custom electromagnetic test equipment (an existing co-axial electromagnetic cell) and a mutli-ring dc-resistivity cell (developed as part of this thesis) were employed. Multiple linear regression models were then developed for each EM observable (dc-resistivity and dielectric permittivity) as a fonction of degree of saturation, choride content, porosity and diffusion coefficent. During the second phase EM evaluation techniques suitable for in situ measurements were used to assess the condition of homogeneous (unreinforced) concrete slabs. A multi-electrode dc-resistivity probe developed during this thesis, capacitive probe and ground penetrating radar (GPR) were employed. The techniques were combined to estimate the condition of each slab by non linear optimization of the regression models developed in the previous phase. It was found that electrical resisitivity tomography (ERT) using the newly developed multi-electrode resistivity probe was especially useful to assess gradients within concrete.
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Submitted on : Friday, December 13, 2013 - 1:54:16 PM
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Raelize Loubser Du Plooy. The development and combination of electromagnetic non-destructive evaluation techniques for the assesment of cover concrete condition prior to corrosion. Materials. Université Nantes Angers Le Mans, 2013. English. ⟨tel-00918356⟩

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