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Feasibility study on self healing of cement-based system using biological fixed fossil limestone powder

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Document pages: 9 pages

Abstract: In order to protect the concrete structure and prevent chemicals from entering through cracks and cracks, maintenance is inevitable. Microbial calcite precipitation is an inherent crack correction method and a sustainable simulation method to reduce man-made greenhouse gas (GHG) while protecting natural resources. In this study, Bacillus subtilis strain was applied to the internal repair of concrete cracks because of its high pH tolerance and sporulation ability. In order to prolong the survival time of microorganisms, immobilization technology was used. Bacillus subtilis was fixed with limestone powder (LSP) before adding cement matrix. The self-healing ability of Bacillus subtilis was discussed in terms of mechanical strength recovery after cracking at 3, 7, 14 and 28 days.To examine the microstructure and characterization of healing precipitate, micrographical (field emission scanning electron microscopy), chemical (energy dispersive X-ray), and thermal (thermogravimetric analysis) analyses were performed after the healing period of 28 days. The results revealed evident signs of calcite precipitation in nano- microcracks subsequent to microbial activity. Furthermore, immobilized LSP improved the compressive strength of the analyzed formulations.

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