Microbially-induced self-healing bioconcrete for sustainable development

In the building industry, concrete is widely utilised as a foundation. In the construction of superstructures, structural concrete, slab construction, stair construction, and architectural components are all utilised. The most frequent components of concrete are cement, fine aggregate, coarse aggregate made of shattered stones or gravels, chemical admixtures, and water. During the curing or hardening process, concrete will shrink slightly. This shrinkage generates strain in the freshly poured concrete, resulting in shrinkage fractures. To rule out this problem, bioconcrete was employed, which is made up of microorganisms that can precipitate calcium carbonate and aid in crack sealing, giving it a self-healing capacity. These are considered to be more cost-effective, eco-friendly, and require less maintenance. Due to the formation of the microcracks leads to the failure of the structure due to corrosion. The importance and efficiency of bioconcrete madding using four different microorganisms—Bacillus subtilis,Brevibacillus sp.,Bacillus megaterium, and Microvirga sp.are discussed in this paper. It has been found that the bioconcrete made using Bacillus subtilishad higher compressive strength of 50.37 N/mm2followed by Brevibacillus sp.with the compressive strength of 42.81 N/mm2