EFFECT OF LOADING ON THE CHLORIDE PENETRATION OF CONCRETE MIXED WITH GRANULATED BLAST FURNACE SLAG

The analysis of loading on the chloride penetration into concrete is very important. In this study, we confirmed that the chloride penetration rates for the plain and BFS concrete were increased by 47% and 89% under the compressive stress, respectively. Under the tensile stress, those for the plain and BFS concrete were increased by 29% and 77%, respectively. The diffusion coefficient of BFS concrete was lower than the conventional one with no BFS no loads and stress states. Under the compressive stress, the diffusion coefficient for BFS concrete was higher with increasing stress as well as the plain concrete. Under the tensile stress, the diffusion coefficient for BFS and plain concrete showed higher values with increasing stress. We investigated the effect of the difference of specific surface on diffusion coefficient. As a result, the larger specific surface of BFS exhibited the lower diffusion coefficient. This tendency showed remarkably under the high stress conditions. We confirmed that the diffusion coefficient was lower with increasing the ratio of substitution BFS. This result was the same even under the compressive and tensile stress conditions. The chloride penetration depth was distributed uniformly under the compressive stress or no stress. However, in the case of the tensile stress, the diffusion distribution of chloride ion penetrated into concrete was no uniform, and I showed the prominent characteristics. This result indicates that the analysis using by average values is not proper under the stress conditions.