Effect of Tensile Loading on Chloride Penetration of Concrete Mixed with Granulated Blast Furnace Slag

Abstract

The effect of loading on chloride penetration into concrete is evaluated in this study. It is found that the chloride penetration 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 BFS concrete was lower than that of conventional concrete without BFS, no loads and stress states. Under tensile stress, the diffusion coefficient for BFS and 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 diffusion coefficient was found to decline with increases in the ratio of substituted BFS. This result was the same even under the tensile stress conditions. The chloride penetration depth was distributed uniformly when no stress was applied. However, in the case of tensile loading, the diffusion depth was not distributed uniformly, and showed prominent characteristics. This result indicates that analysis using average values of chloride penetration depth is not proper under load conditions.