Abstract
Microbial-induced calcium carbonate precipitation (MICP) is an environmentally friendly technology to repair cracks. In this study, expanded perlite was used to adsorb bacteria as a self-healing agent, and basalt fibers were used for the first time to enhance the healing effect of microbial mortar. The mechanical properties and impermeability of fiber-reinforced bacterial concrete were investigated, the macroscopic crack healing effect and the precipitation path of generates were observed by optical microscopy, and the coupling effect of fibers and bacteria was studied and revealed by microscopic experiments. It was shown that the addition of a self-healing agent made the self-healing performance of mortar significantly enhanced, and the incorporation of fibers enhanced the mechanical properties and impermeability of the mortar. The basalt fibers provided the location for calcium carbonate precipitation, and its bridging action provided the pathway for precipitation. The fibers offered the possibility of healing cracks larger than 300 μm in width.
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