Influence of Natural Zeolite and Mineral additive on Bacterial Self-healing Concrete: A Review

With time, the development of micro-cracks in concrete is a frequently reported problem structures due to ingress harmful substances, leading degradation its quality and strength, which ultimately declines construction. The present work review paper based on enhancing self-healing property by inducing different bacteria alone or incorporating mineral additives. It has been seen that various rehabilitated methodologies are queue surmount concrete’s weaknesses increase strength durability. latest methodology includes using non-pathogenic microbes as Microbial induced Calcium Carbonate Precipitation (MICCP). precipitating calcium carbonate (CaCO3) crystals their metabolic activities helps repair cracks harsh conditions improve strength. Ureolytic like Bacillus pasteurii/Sporosarcina pasteurii, subtilis, megaterium, etc., have specific they can excite urea when integrated with source help sealing CaCO3 precipitation. Different studies observed specimens having bacterial concentration 105-107 cells/ml Natural Zeolite (NZ) replacement (10%) represents better interaction microstructure because formation silicate hydrate (CSH) gel. Further, reduction CH bond reduced pore space also observed. NZ enhances micro-structural property, but it shows CaCo3 precipitation more densification under combination. XRD confirms an calcite composition used. overall properties standard high-strength (105-107 cells/ml) 10% provide option for future sustained strong concrete. Doi: 10.28991/CEJ-2022-08-05-015 Full Text: PDF