Abstract
This paper focuses on adopting a new biotechnology tool for enhancing the property of fly ash concrete. Much of the coal fly ash generated from power plants is being dumped regularly. However, environmental situations do not permit dumping of fly ash in huge quantity. To cope with this problem, biotechnology tool is being implemented in the current research work for the utilization of fly ash in concrete. Strength and durability properties of bacteria-embedded fly ash concrete are examined for various ratios of bacterial solution to water. Experimental results show that incorporating alkaliphilic endospore-forming bacteria into fly ash concrete exhibited higher strength and durability than conventional concrete for bacterial solution to water ratios of 0.3 and 0.6. Interestingly, the ratio of compressive strength to split tensile strength of bacteria-embedded fly ash concrete was lower than that of ordinary concrete. It was observed that fly ash replacement up to 30% exhibited better strength and durability properties than normal concrete. Scanning electron microscopic analysis revealed direct involvement of the strain in precipitating calcite and was confirmed by XRD.
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