This paper describes the influence of pore structure parameters on the water permeability coefficient of cement mortar. Plain and fibre reinforced (0.25% by volume) mortar specimens were experimentally investigated. The permeability coefficients were determined using an in-situ method where specimens were subjected to uniaxial compression (0 - 90% of the compressive strength). Micro-CT technique was employed to characterize the pore system. The results show that the coefficient of water permeability bears a correlation with connected porosity and, with the ratio between connected porosity and tortuosity across the load levels.
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