Innovative use of microbially induced calcite precipitation and zeolite for enhanced self-healing concrete

ABSTRACT

Concrete, the cornerstone of modern building, has certain intrinsic shortcomings, such as poor tensile strength and crack susceptibility. Thus, biomineralization appears to be a promising strategy for repairing concrete construction defects through microbial activity. The most advanced use of this novel approach is Microbiologically-Induced Calcite Precipitation (MICP). Microbial urease enzyme-catalyzed calcium carbonate precipitation is a phenomenon that can be produced in concrete mixes containing zeolite by adding bacteria. This promotes calcite formation, sealing fissures and enhancing longevity. Our study compares M25 Bacterial Concrete (BC) and Conventional Concrete (CC) for optimal mix design and performance. We show by thorough experimentation that adding zeolite and bacteria does not affect the workability of concrete mixtures. In addition, BC has better compressive strength at different curing ages because of the sealing action of calcite precipitation and the synergistic improvement of zeolite. Results show MICP boosts concrete durability and cuts maintenance costs. Our research also looks into the flexural behaviour of beams made of reinforced concrete produced by microbes, offering insights into the structural performance of these novel materials in real-world applications. Materials support SDGs by fostering sustainable production and industrial innovation.

Keywords:
Biomineralization; Green Construction Materials; Zeolite Additives; Sustainable Construction