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The effect of loading on chloride penetration into concrete is evaluated in this study. It is found that the chloride pene- tration rates for OPC concrete and blast furnace slag BFS concrete under the tensile stress were increased by 29% and 77%, respectively. The diffusion coefficient of FA and BFS concrete was lower than that of conventional concrete without BFS, no loads and stress states. Under tensile stress, the diffusion coefficient for FA and BFS, plain concrete showed higher values with increasing stress. The influence of specific surface area on the diffusion coefficient was investigated. As a result, the larger the specific surface areas of BFS are the lower diffusion coefficients. This tendency was more pronounced under the high stress conditions. The chloride penetration depth was distributed uni- formly when no stress was applied. However, in the case of tensile loading, the diffusion depth was not distributed uni- formly, and showed prominent characteristics. This result indicates that analysis using average values of chloride pene- tration depth is not proper under load conditions.
