Mechanical Properties of Bacterial Concrete by Partial Replacement of Cement by Nano Silica in Different Grades of Concrete

Abstract

Concrete with nano-silica also has a higher strength compared with normal concrete. In the current study, an examination of the mechanical characteristics of bacterial concrete containing nano-silica is conducted. The impact of concrete was examined in this study employing Bacillus subtilis for self-Healing Microbial Type Culture Collection (MTCC) Strain no.121, Among the bacteria concentrations of 104 , 105 , and 106 cells/ ml, a concentration of 105 cells/ml gives more strength, so further investigation is done using 105 cells/ml cell concentration for different percentages of nano-silica is examined. Firstly, Bacterial cell concentration is optimised. Each of the 40 sets of cubes (150 mm x 150 mm x 150 mm), cylinders (150 mm diameter and 300 mm height), and prisms (100 mm x 100 mm x 500 mm) are cast and tested at 28 days and 90 days as part of further research to determine the mechanical properties of bacterial concrete with different percentage of nano silica with and without bacteria. It has been noted that adding nano-silica to concrete increases its strength from 0% to 1.5% before being decreased to 2%. concrete splintering occurs due to a number of causes, including mechanical compression and low tensile strength, shrinkage, freeze-thaw reaction, and others. External loads can cause high tensile strains. For any combined nano-silica percentage when compared to regular concrete, bacterial concrete is stronger.