DEVELOPMENT OF A CRACK REPAIR METHOD USING YEAST-INDUCED CALCIUM CARBONATE PRECIPITATION

Although many examples of water leakages are observed between the high column of the bridge and the deck, the gaps in between them are not recognized as degradation. However, if water leaks from the gap, deterioration of the reinforced concrete becomes faster than expected, so even though this is not an urgent matter, some inexpensive repairs would be necessary. In this study, the applicability of bio-grout using microbial metabolism for crack repairs was investigated. Bio-grout is a repair material using microbial metabolism, mainly based on water. Therefore, bio-grout is expected to penetrate cracks more easily due to a capillary tension that is quite different from conventional inorganic or organic grout. Therefore, it is unnecessary to press fit the grout into cracks, and this grout is environmentally friendly. This study examined the mixture proportion of the bio-grout used to produce a significant amount of calcium carbonate. Further, the precipitation amount of calcium carbonate was investigated via sedimentation analysis using a geochemical code. The simulation model based on the geochemical code successfully reproduced, the precipitation amount of calcium carbonate with reasonable precision.