Analysis of restoration of strength and durability properties of biomineralized self-healing self-compacted concrete

The durability of the concrete structure is the most significant parameter affected by surface fissures and voids. To address this specific challenge, biomineralized self-compacted concrete is introduced to investigate its mechanical properties and durability characteristics, including electrical resistance and chloride penetration. The cube specimens were prepared in the presence of bacteria Bacillus megaterium and Sporosarcina pasteurii at a concentration of 105 cells/ml, and tested at 28, 56, and 120 days. The result investigation shows an enhancement in compressive strength of (28.82% - 16.83%) in the mix BMS10P and (28.35% - 17.31%) in the mix BMK10P at 28 and 120 days, respectively. It was noted that the flexural strength was maximum by (20.00% - 15.91%) in the mix BMK10P, and the tensile strength reached (20.09% - 15.28%) in the mix BMS 10 P at 28 and 120 days. The chloride permeability test shows the maximum decline of (30.78 - 33.74%) in mix BMS10P and (37.14 - 42.28%) in mix BMK10P at 28 and 120 days, respectively. The intrinsic property of the concrete, i.e., electrical resistivity, shows much better performance in the mixes BMS10P and BMK10P, with improvements of 56.72% - 67.90% and 59.65% - 71.63% at 28 and 120 days, respectively. The novelty of the present work lies in comparing biomineralized self-compacted concrete, providing new insights into how to make concrete more resistant to chloride attack.