Self-healing performance of fiber varied types and compositions reinforced high density concrete

With a focus on the crack self-healing performance of heavy concrete used for radioactive material containing vessels, the authors conducted research on the self-healing performance when the type and mixing amount of reinforcing fibers were changed. Within the scope of this study, the self-healing performance was improved when reinforcing fibers were mixed, and the self-healing performance was different depending on the characteristic values of the reinforcing fibers. However, increasing the mixing amount was not always effective. It is considered that the effects of mixing the reinforcing fibers are in promoting self-healing at an early stage, reducing the crack width and water permeability, promoting the adhesion of calcite, which is a subsequent cement hydrate, and thus enhancing the self-healing performance. (A.O.)