A study on using nano calcite as the accelerated agent in microbially induced calcium carbonate precipitation for soil-sand bio-cementation

Abstract

Abstract Bio-cementation through bacterial mineralization can be considered an “eco-friendly” solution for soft or loose sandy soils, particularly in ground slopes and high rainfall zones, to achieve sustainable development goals. Using urelytical bacteria with the ability to decompose urea for calcium carbonate precipitation can be selected as the primary agent for the bio-cementation process. This study clarifies the effects of adding nano calcite as nucleation sites for enhancing the bio-cementation with Vietnam-isolated bacteria. Both microstructure of the precipitation and MICP capacity were studied. Microscopic, SEM/EDS, and X-ray diffraction data were used to characterize and identify the mineral compositions. Also, a simulated rainfall model and wind flow were set up to evaluate the erosion resistance of sand samples.