Water permeability tests and SEM analysis were conducted for self-healing of cracking in heavyweight concrete used as containments for radioactive substances to preventing leaching of radioactive contaminants. Within the range of this study, water permeability is reduced by self-healing at an early stage, but the internal crack width scarcely changed, with crack closure being limited to the surfaces. Also, the addition of an expansive additive led to early self-healing, presumably due to its chemical prestress effect. In contrast, the inclusion of fly ash and organic fibers appears to produce its effect slowly and progressively over a long time.
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