Experimental Study to Improve the Shear Stress of Silty- Sandy Soils by Using Urease Producing Bacteria

Mohammed A. Ibrahim, Raid R. Al-Omari, Mustafa H. Ibrahim

Abstract


In this paper, microbial calcite cementation that affect the properties of soil specially shear strength was achieved by using the common soil microorganism Bacillus Pasteurii and cementation reagent containing urea and calcium chloride. While a number of significant factors can affect the success of the microbial treatment, this study focused on the effects of microorganisms on the shear strength of silty sandy soils where the treated soil samples tested by direct shear test to evaluate the effect of microorganisms on shear strength of silty sandy soils. The results showed that the angle of internal friction decreased subsequently from 49.5° in untreated soil to 34.9°,36.8°,36.3°,33.5° with treatment period of two weeks, one month, two months and three months and cohesion of soil increased subsequently from 6.09 kPa for the untreated silty sand soil to 10.21,9.586,10.99,11.93 kPa for the same treatment period.


Keywords


Soil improvement; Biocementation; shear strength; Microbial Carbonate Precipitation.

Full Text:

PDF

References


De Muynck W, Debrouwer D, De Belie N & Verstraete W, “Bacterial carbonate precipitation improves the durability of cementitious materials” CEMENT AND CONCRETE RESEARCH, vol. 38(7), pp. 1005-1014,2008.

Achal V, Pan X & Özyurt N, “Improved strength and durability of fly ash-amended concrete by microbial calcite precipitation,” Ecol. Eng., vol. 37, pp. 554-559, 2011.

Sarda D, Choonia H, Sarode D & Lele S, “Biocalcification by Bacillus pasteurii urease: a novel application," J. Ind. Microbiol. Biotechnol., vol. 36, pp. 1111-1115, 2009.

Dejong JT, Mortensen BM, Martinez BC & Nelson DC, “Bio-mediated soil improvement,” Ecol. Eng., vol. 36(2), pp. 197-210, 2010.

Qian C, Pan Q & Wang R, “Cementation of sand grains based on carbonate precipitation induced by microorganism,” Sci. China Technol. Sci., vol. 53, pp. 2198-2206, 2010.

Al Qabany, A., Soga, K., Santamarina, C. “Factors Affecting Efficiency of Microbially Induced Calcite Precipitation,” journal of geotechnical and geoenvironmental engineering, ASCE,Vol. 138,pp.992-100,2012.

Martinez BC, Barkouki TH, DeJong JT & Ginn TR, “Upscaling of microbial induced calcite precipitation in 0.5m columns experimental and modeling results,” Geo-Frontiers, pp. 4049-4059, 2011.

van Paassen LA, Daza CM, Staal M, Sorokin DY, van der Zon W & van Loosdrecht Mark CM, “Potential soil reinforcement by biological denitrification,” Ecol. Eng, vol. 36, pp. 168–17, 20105.

Kucharski ES, Cord-ruwisch R, Whiffin V & Al-thawadi SM, “Microbial biocementation,” United States Patent, 2008.

Ivanov V & Chu J, “Applications of microorganisms to geotechnical engineering for bioclogging and biocementation of soil in situ,” Rev. Environ. Sci. Biotechnol., vol. 7, pp. 139-153, 2008.

Harkes, M. P., van Paassen, L. A., Booster, J. L., Whiffin, V. S., van Loosdrecht, M. C. M. “Fixation and distribution of bacterial activity in sand to induce carbonate precipitation for ground reinforcement”. Ecol. Eng., Elsevier journal, Vol. 36, pp.112-117,2009.


Refbacks

  • There are currently no refbacks.


 
 
  
 

 

  


About ASRJETS | Privacy PolicyTerms & Conditions | Contact Us | DisclaimerFAQs 

ASRJETS is published by (GSSRR).