, Volume 46, Issue 7, pp 1183-1191
Date: 02 Nov 2012

Effect of silica fume addition and repeated loading on chloride diffusion coefficient of concrete

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In this paper, the effect of silica fume (SF) on the chloride diffusion coefficient of concrete subjected to repeated loading was examined. Portland cement was replaced by 5 and 10 % SF. Five cycles repeated loadings were applied to concrete specimens, the maximum loadings were 40 and 80 % of the axial cylinder compressive strength ( \( f_{\text{c}}^{\prime } \) ), respectively. The diffusion coefficients were calculated from the steady state in the chloride migration test using the Nernst-Planck equation. The service life of concrete in chloride environment was predicted by Life-365 model. The results indicate that the diffusion coefficients of concrete containing 5 and 10 % SF replacements are lower than that of the control concrete at the age of 28 days. This trend increases with the increase of SF replacement. Five cycles repeated loading at 40 % \( f_{\text{c}}^{\prime } \) or 80 % \( f_{\text{c}}^{\prime } \) increase the diffusion coefficients (D 28) for all mixes investigated in this study. However, the effect of 80 % \( f_{\text{c}}^{\prime } \) on D 28 of concrete with 10 % SF is significantly lower than that of the control concrete without SF. Compared with the control concrete without SF, 10 % SF replacements increase the service life of concrete by more than 10 times.