The Influence of Fly Ash Dosages on the Permeability, Pore Structure and Fractal Features of Face Slab Concrete

Concrete-face slabs are the primary anti-permeability structures of concrete-face rockfill dam (CFRD), and resistance face slab concrete to permeability is key factor affecting operation safety CFRDs. Herein, influences five fly ash dosages (namely 10%, 20%, 30%, 40% 50%) on property concretes were investigated. Moreover, difference in caused by dosage variations revealed terms pore structure fractal theory. The results illustrate that: (1) inclusion 10–50% lowered compressive strength before 28 days hydration, whereas it contributed 180-day increment. (2) incorporation raised average water-seepage height (Dm) relative coefficient (Kr) about 14–81% 30–226% at days, respectively. At 180 addition improved impermeability less than 30%. (3) closely correlated with their Ds. (4) optimal long-term refinement around Nevertheless, containing a high must be cured for relatively long period they can withstand water pressure.