EM characterization of hydraulic concretes in the GPR frequencyband using a quadratic experimental design

Abstract

This study is focused on the electromagnetic characterization of hydraulic concretes within the ground-penetrating radar frequency band. The evaluation of the complex dielectric properties is carried out in laboratory on mixtures defined by a specific experimental design. The composition parameters of the mixing are the nature of the aggregates, the nature of the cement, the cement content, the water to cement ratio water (W/C) and the chloride content. The model underlying the experimental design, is a multi-linear polynomial of the chosen engineer parameters. The exploitation of this set of data consists in a calculation level of the coefficients of this model independently for the real part and the imaginary part of the relative permittivity. This reveals the significant relations of the dielectric properties to the mixture parameters. Raw results in terms of the real part and the imaginary part of the dielectric permittivity along frequencies are presented with dry concrete and saturated concrete, including various chloride contents. Résumé