Experimental Study on Strength Properties of Concrete Incorporated with Bacteria

Extensive research is currently focused on the concept of bio-concrete, with impressive performance outcomes. This innovative technique involves introducing bacteria into concrete to facilitate self-healing of cracks. The significant objective of the current study was to evaluate the strength-related aspects of bacterial concrete and provide evidence on the existence of bacteria in concrete specimens, which influences its properties. Two types of bacteria from the Bacillus family, Bacillus pasteurii and Bacillus cereus, were examined. The results revealed that concrete infused with B. cereus exhibited superior compressive, flexural, and split tensile strength compared to B. pasteurii bacterial concrete, with improvements of 6.1, 7.15, and 5.11%, respectively, after 28 days. The inclusion of bacteria and the utilization of ground granulated blast-furnace slag (GGBS) as a cement supplement make the concrete environmentally friendly and cost-effective and contribute to reduced CO₂ emissions. Consequently, bacterial concrete significantly enhances the strength and durability of concrete structures, promoting a sustainable and eco-friendly future.