Abstract
This paper presents a numerical approach for predicting moisture transport in concrete based on pore size distribution represented by a multi-Rayleigh–Ritz model that includes gel pores, small and large capillaries, and microcracks. The comparisons between the predicted pore size distributions and the mercury intrusion porosimetry results indicate that several small capillaries with diameters less than 20nm may be connected to smaller gel pores. Moisture transport experiments under different atmospheric conditions were conducted to verify the proposed approach. The comparison between the predicted and measured internal relative humidity values showed acceptable agreement. The simulation results showed that microcracks had greater influence on the concrete drying rate than the other pore components. Results also revealed that more large capillaries caused a larger moving rate of the wet front and a larger moisture transport rate in the unwetted region.
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