As a part of the trend to use sustainable and environmentally friendly construction materials, raw earth has long been confirmed to be suitable to meet these challenges. As an hygroscopic material, like wood, its mechanical and physical properties are highly dependent on moisture content and the surrounding environment. This paper aims to evaluate moisture content distribution in raw earth bricks varying from the outer surface to the centre of the material. The electrical resistivity method is used to perform the cartography of moisture content at required locations. An experimental equipment based on geophysical devices is developed to inject an electric current into the material by using an optimized multiplexing technique. Furthermore, an electrical-thermal analogy is employed to build diffusion models. A numerical inversion is also used to optimize experimental results and the transition law between electrical resistivity and moisture content is established.
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