| Summary: | 碩士 === 國立海洋大學 === 材料工程研究所 === 91 === Abstract
In this study the electrochemical technique is applied to accelerate chloride ion migration in cement-based material to estimate its permeability. The plain cement concrete and concrete containing different type of mineral admixtures (slag and fly ash) with w/b (water/binder) ratios of 0.35, 0.45, 0.55, and 0.65 were used. For all test series, the chloride concentration in the anode cell as well as the electrical current were simultaneously monitored in the accelerated chloride migration test (ACMT).
The steady-state diffusion coefficient for concrete was calculated using the constant flux on the basis of the Nernst-Planck equation. The charge passed from different conditions were separately defined and derived. For concrete containing mineral admixtures, there is no obvious correlation between diffusion coefficient and charge passed obtained from non-steady-state conditions. The results for all mixtures show that the steady-state diffusion coefficient and charge passed obtained from the accelerated chloride migration test under steady state condition is linearly correlated.
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