Stabilization Characteristics of Different Loose Sandy Soils using Microbial-Induced Calcite Precipitation

Authors

  • Naglaa MOHAMED Faculty of African Postgraduate Studies, Cairo University, Egypt
  • Nehad HAFEZ National Water Research Center, Egypt
  • Medhat EL-MAHLLAWY Housing and Building National Research Center (HBRC), Egypt
  • Abbas SHARAKY Faculty of African Postgraduate Studies, Cairo University, Egypt

DOI:

https://doi.org/10.48048/wjst.2021.9129

Keywords:

Sporosarcina pasteurii, Biocementation, Calcite, Properties, Durability

Abstract

Loose sands (siliceous, silty, and calcareous classes) are extensively found near arid areas in Egypt. Furthermore, many geotechnical structures, like water channels and roads, may be constructed on weak or loose sand soils. The geotechnical behavior of loose sands is usually connected with different interdependent problems, such as high permeability, low shear strength, low bearing capacity, high seepage, and low stability. This work characterized the effect of stabilization of the siliceous, silty, and calcareous sandy soils via biocementation process using Sporosarcina pasteurii bacteria as a potential eco, commercial, and engineering solution. This was carried out using bacteria, fixation, and cementation solutions (BFC) at different times number additions. The results indicated that the addition times of solution have a remarkable effect on the physical and mechanical properties of sandy soils. The results also proved that the precipitation of calcite by the bacterial activity led to cohesion of soil grains, and this increased the resistance of soils to deterioration. In addition, the high content of the precipitated calcium carbonate enhanced the shear strength and the unconfined compressive strength and decreased the soil permeability. S. pasteurii bacteria can be used successfully and commercially in the biocementation process for siliceous sand, silty sand, and calcareous sandy soils in Egypt using the recommended conditions and mixes.

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Published

2021-04-19

How to Cite

MOHAMED, N. ., HAFEZ, N. ., EL-MAHLLAWY, M. ., & SHARAKY, A. . (2021). Stabilization Characteristics of Different Loose Sandy Soils using Microbial-Induced Calcite Precipitation. Walailak Journal of Science and Technology (WJST), 18(9), Article 9129 (17 pages). https://doi.org/10.48048/wjst.2021.9129