Loose sands (siliceous, silty, and calcareous classes) are extensively found near arid areas in Egypt. Furthermore, many geotechnical structures, like water channels roads, may be constructed on weak or loose sand soils. The behavior of is usually connected with different interdependent problems, such as high permeability, low shear strength, bearing capacity, seepage, stability. This work char...

Bio-cementation is a new sustainable approach that has gained popularity due to its low energy and carbon dioxide footprint compared with those of existing technologies for geotechnical geoenvironmental engineering applications. soil improvement technique involves binding the pore space particles calcium carbonate minerals by microbially induced precipitation (MICP) filling space. The purpose t...

Tangential flow-induced interface erosion poses a major threat to wide variety of engineering structures, such as earth-filled embankment dams, and oil- gas-producing wells. This study explores the applicability microbial induced calcium carbonate (CaCO 3 ) precipitation (MICP) by way ureolytic soil bacterium Sporosarcina pasteurii method for enhancing surface resistance fine sand. Specimens we...

By using natural-abundance (13)C-nuclear magnetic resonance spectroscopy and high-performance liquid chromatography (HPLC) analysis we have investigated the types of compatible solutes that are synthesized de novo in a variety of Bacillus species under high-osmolality growth conditions. Five different patterns of compatible solute production were found among the 13 Bacillus species we studied. ...

The current paper presents the results of an experimental study on application calcium carbonate precipitation bacteria as a new approach to repairing damaged concrete when exposed high temperatures. To do so, cylindrical and cubic specimens were initially heat in furnace for 1 h, after reaching two different temperatures 600 800 °C. A rate 5.5 °C per minute was used achieve target Then, types ...

Most previous studies investigating the use of microbial-induced calcium carbonate precipitation (MICP) to reinforce foundations have indicated that final curing effect can be improved by changing nutrient environment parameters during MICP reaction. However, using such methods improve construction process increases cost and impact on surrounding environment. This study was conducted determine ...

Biomineralization is an emerging biotechnology for subsurface engineering applications like remediating leaky wellbores. The process relies on ureolysis to induce precipitation of calcium carbonate in undesired flow paths. In geologic storage CO2, there a potential leakage and low pH conditions, thus, ureolysis-induced (UICP) was tested at field scale seal channel the wellbore cement annulus pr...