Abstract
This study proposes a quantitative evaluation method of water migration in concrete. The threshold pore diameter (TPD) was obtained using the concept of critical volume fraction for percolation (CVFP; assumed to be 16%). This TPD had good correlation with the TPD obtained using another method which we had proposed in a previous study. The time required for water to penetrate in the concrete specimen by capillary action was calculated using the obtained TPD and compared with the measured time. The comparison yielded the tortuosity of six. Based on the concept of CVFP, the volume fraction of the pore whose size is greater than TPD can be constant. Permeated water volume in a water permeability test was calculated assuming tortuosity and effective area to be six and 16%, respectively, and the results agreed to some extent with the experimental ones. However, the calculation with the effective area of 16% overestimated the permeated water volume. We suggest that trapped air bubble during water infiltration can be the reason for the gap.
