Strength and characterization studies on nano-silica and steel fibre reinforced bacterial concrete: An eco-friendly and sustainable approach

The growing need for environmentally friendly building materials has prompted the creation of creative methods to enhance concrete's mechanical qualities and ecological sustainability. With a focus on its eco-friendliness and sustainability, this research examines the mechanical characteristics and qualities of bacterial concrete augmented with steel fibers (SF) and nano-silica (NS). NS is used at 1%, 2%, 3%, and 4% together with 1% of SF to improve the mechanical strength and durability of concrete. It is well-known for its pozzolanic activity and capacity to refine pore architectures. In this research, tests for compressive, flexural, impact, bond, and splitting-tensile strength are evaluated. Microstructural characterization conducted using techniques such as SEM with EDS on the optimized mix confirms the improved pore structure and calcite (CaCO3) deposition. Comparing the findings of bacterial concrete with the control mix, the addition of 2% NS and 1% SF enhances the compressive strength by 14.17%, the splitting tensile strength by 8.69%, and the flexural strength by 12.16%. This study therefore emphasizes the possibility of combining microbiological, SF, and NS technologies to create cutting-edge green concrete solutions.