Moisture content has implications on the durability and service life of a concrete structure. Measurement of the moisture content is usually performed via non-invasive electrical techniques. In this paper, the electrical response of hardened concrete is acquired and correlated to the Degree of Saturation (DoS) of the material. The pulsed electrical excitation is imposed on the sample and the output is recorded at various electrode locations along the sample length. Using a one dimensional circuit model and a Gaussian and Inverse Multiquadric Radial Basis Function (RBF) based inversion scheme, the cumulative and spatial distribution of the real and imaginary parts of the impedance are re-constructed along the length of the sample. An excellent fit with the experimental data is observed and an empirical relationship is proposed between the DoS and the absolute impedance, which would facilitate the estimation of the DoS profile in samples with homogeneous and non-homogeneous moisture distribution.

水分含量对混凝土结构的耐久性和使用寿命有影响。水分含量的测量通常通过非侵入性电气技术进行。在本文中，获取硬化混凝土的电响应并将其与材料的饱和度 (DoS) 相关联。对样品施加脉冲电激励，并在沿样品长度的不同电极位置记录输出。使用一维电路模型和基于高斯和逆多二次径向基函数 (RBF) 的反演方案，阻抗的实部和虚部的累积和空间分布沿样本长度重新构建。