Cluster and regression analysis of properties of bacillus megaterium bacterial concrete

The existence of voids in concrete mix may result in deterioration in its quality when subjected to considerable settling and shrinkage. This research aims to improve the qualities of concrete by using microorganisms to reduce the presence of voids. The Bacillus bacteria family has been shown to have extraordinary healing properties for concrete. The current study used a bacterial solution of Bacillus megaterium from the Bacillus bacteria family at concentrations of 10³, 10⁵, and 10⁷ CFU. A total 135 number of specimens were made and also tested for durability and strength at one, four, and eight weeks. The results of the test show that flexural, compressive and split tensile strength increased by 8.83%, 10.10%, and 12.45% MPa after 8 weeks of testing at a bacterium 10⁵ cells/ml concentration. The value of absorption of water employing bacteria in concrete mix was found to be lower than that of ordinary concrete mixture. The cracks in the concrete are filled as a result of calcite precipitation generated by the bacterial solution of Bacillus megaterium. The R² value of the regression study between compressive and water absorption was 0.6222, while the R² value between compressive strength and UPV was 0.4967. The study also included a cluster analysis of water absorption and compressive strength.