The pore structure and water permeability of cement paste blended with fly ash over a long period up to one year

The relationships between total porosity and permeability coefficient are plotted as shown in Figure 1. It is clear that almost all samples with high porosity are more permeable. The total porosity of control sample and cement pastes blended with 30 and 50% of FA are 31.5%, 30.73% and 35.50%, respectively at 7 days. Although the control sample and cement paste blended with 30% of FA have a similar total porosity, the water permeability of these two samples are different (4.12 × 10−11 and 4.57 × 10−12 m/s).