Bio-deposition approaches for sustainable execution of recycled aggregates in concretes

Our study offers a quantitative framework for microbial-induced calcium carbonate precipitation (MICP) to uplift the properties of recycled aggregate concrete (RAC). In this regard, marine alkalophilic bacterium Bacillus sp. B6 was employed, and its growth mineralization efficiency under seawater conditions investigated. Optimization MICP achieved with different nutrient sources bacterial introduction methods (dip spray). The treated aggregates (RA) determined by using scanning electron microscopy (SEM) energy dispersive X-ray (EDX) in combination basic technologies density improvement water absorption. results show that optimal carbon nitrogen are glucose (7 g L −1 ) tryptone (5 gL ), respectively. Spray is reported be efficient reduction absorption (∼19%), bulk (∼2.4%) apparent (∼1.7%). effectiveness treatment process confirmed SEM EDX observations, indicating filling microcracks carbonates. As such, mechanical RAC spray RA significantly increase up ∼24% compressive strength as compared control treatment. Current findings will help revitalize construction industry utilizing MICP-treated minimizing load on natural aggregates.