The purpose of this work is to increase the efficiency of concrete by employing a particular growth/filler that is created by microbes. One such line of reasoning led to the development of a very unique concrete known as "microbial concrete," which employs microorganisms to repair concrete defects. Researchers that worked with different microbes proposed a number of microbial concretes. In this experiment, the bacteria "Pseudomonas" was employed. A common bacterium used in scientific labs for calcite synthesis is pseudomonas, which can produce calcite precipitates on suitable media that is provided with a calcium supply. When two different concentrations of bacteria (106 and 107 cfu/mL) were introduced to cement concrete, it was found that the bacterial concrete produced distinct outcomes from regular concrete. The results of this study showed that when the dilution factor was 106 cells per millilitre of mixed water, the addition of bacteria significantly increased compressive strength. Scanning electron micrography analysis of the sample revealed that holes were partially filled up by material growth after the microbes were added. Moulds of concrete cubes containing and lacking bacteria were used, and it was shown that adding microorganisms greatly enhanced the cubes' compressive strength. In this work, concrete cylinders containing and lacking microorganisms were moulded. It was shown that the cylinders containing microorganisms had a considerably higher split tensile strength than the control. The results revealed a maximum increase of 12 percent in split tensile strength and a maximum increase of 16 percent in compressive strength when compared to normal concrete. Through durability testing, it was shown that when treated with either five percent H2SO4 or five percent MgSO4, bacterial concrete lost less weight and had a greater tensile strength than conventional concrete when compared to control concrete.

concrete; concrete surface treatment; bacteria; curing; mechanical properties; eco-friendly.