A new procedure is presented with which the diffusion coefficient of water in partially saturated porous materials can be measured. The first step in the procedure is the creation of a non-equilibrium situation inside a sample by placing it into a centrifuge. In the second step, the mass of the sample is measured by hanging it from two cables, each connected to a balance. The comparison of the time evolutions of the measured masses and the masses as predicted using Fick’s second law gives the diffusion coefficient.
Zanden, van der, A. J. J., & Taher, A. (2014). A gravitational procedure to measure the diffusion coefficient of mater in porous materials : a case study on concrete. Drying Technology, 32(6), 708-712. https://doi.org/10.1080/07373937.2013.856915