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During hydration, the capillary pore size, as well as the overall capillary porosity, decreases due to consumption of water during hydration, producing hydration products that fill in the capillary pore space. The size of the gel pores are fixed by the structure of the C-S-H, however, and so remain relatively constant in size. As hydration continues, the size of the smallest capillary pores decreases to roughly the 10 nm gel pore size [2,29]. Therefore the importance of the pure capillary pore transport paths decrease with time due to decreasing capillary pore size as well as decreasing pore connectivity.