Improving Geotechnical Properties Of Sands Using Microbially Induced Calcite Precipitation (Micp): Influencing Factors And Laboratory Evaluation

Abstract

Microbially Induced Calcite Precipitation (MICP) is a sustainable method for soil strengthening, which offers energy efficiency, and protection of the ecological environment. It successfully enhances sand strength and stiffness, erosion resistance, and permeability, without the limitations and pollution associated with cement and chemical materials. In this paper Laboratory tests were conducted to evaluate the impact of ureolysis-catalyzed calcium precipitation by "Sporosarcina Pasteurii" on the geotechnical properties of sand. The study investigates the treatment process and identifies key factors that influence the outcomes. The key influence factors like Degree of Saturation, Optical Density of Bacterial Solution, Molarity of Cementation Solution, Particle Size, Distance from Point of Inoculation, Curing Period and pH is maintained 7.5-8.5 were assessed. The mass of Calcite precipitation was measured through the Gravimetric Acid Washing method. Additionally, Scanning Electron Microscope (SEM), Energy Dispersive X-ray Analysis (EDX) and X-Ray Diffraction (XRD) analyses were carried out to examine the bonding between the sand particles.