Abstract
Microbial self-healing is an innovative technology which repairs cracks in concrete by precipitation of calcite. The main focus of our research study was focused on evaluating the performance of synthesized microbial agent with Bacillus sphaericus (spore forming urelotic strain) of cell dosage 105 cells/ml in repairing cracks in fly ash concrete. The bio-based agent is added to cracks in fly ash concrete. The effectiveness of prepared bio- based agent in repairing the cracks in concrete was assessed by comparing with non-based agent prepared with cement, sand and water. The mechanical and water absorption property are evaluated. The compressive strength and water absorption of micro-repaired concrete was found to increase by 10% and 6 % in comparison with non micro repair concrete. Scanning electron microscope analysis of concrete samples was done to confirm formation of calcite. The analysis showed formation of calcite particle near the microbial cells. This confirms that the improvement in properties of concrete is due to formation of calcite particles due to biomineralization process. Use of Micro-based agent would lead to environmental and economical benefit. Over all the maintenance and repair cost could be reduced and also play a role in reducing green house gas emissions and help to develop sustainable concrete.
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