De termination of diff usion coefficient of chloride in reinforced concrete containing nano SiO۲

Reinf orced concre te structure and chloride diffusion in concrete are experimently studied by differe nt researchers. According to diffe rent researches chloride diffusion is main caus e of corrosion and de gradation of steel in co ncrete. Chlorides can come from several sources. They can be cast into the c oncrete or they can diffuse in fro m the outsid e. In this study Electrochemical Impedance S pectroscopy (EIS) was used to determine chloride diffusio n in concr ete. Nanopa rticle has been found to improve co ncrete properties. Much of the work to date on concrete with nanopa rticles has been with nano-silica (n ano-SiO۲). The aim of this study is to investigate the nano SiO۲ addition effect on the concrete sample’s chl oride diffusion. Diffusion coefficient of chloride (D) determined usin g Warburg coefficient (ıw) from the Nyquist plot obtaine d by EIS measurement. On a Nyqu ist plot, at high freque ncies the Warburg impedance is s mall . At low frequenc ies (linear range) chlori de ions hav e to diffuse further, in creasing the Warburg im pedance.

کلیدواژه ها:

Chlo ride Diffusio n ، Nano Si O۲ ، Warburg coefficient ، Nyquist plot ، Randel plot