Investigation on Pore Structure and Permeability of Concrete–Rock Interfacial Transition Zones Based on Fractal Theory

The concrete–rock interfacial transition zone (ITZ) is generally considered the weak layer in hydraulic engineering, for it more permeable than intact concrete or rocks. water permeability of ITZ a critical parameter concerned with structural safety and durability. However, pore structure has not been investigated previously, mathematical model established. This study performed multi-scale experiments on various rock types (limestone, granite, sandstone). A series quantitative qualitative analysis techniques, including NMR, SEM-EDS, XRD, characterize structures. controlled constant flow method was used to determine concrete, rock, ITZ. proposed using fractal theory. consistency between experimental data indicates reliability this study. results experiment show that 4.08 × 10?18 m2 5.74 m2. could durability analysis.