Behavior Study of Cemented Specimen by Biological Technique after Disturbance

Subject Areas : Structural Engineering

Mohammad Reza Asgari ¹ , Mohammad Azadi ²

1 - 1Master of Science in Construction Management, Department of civil Engineering, Qazvin Branch, Islamic Azad University, Qazvin, Iran.
2 - Department Of Civil Engineering, Qazvin Branch, Islamic Azad University, Qazvin, Iran

Received: 2019-04-18 Accepted : 2019-05-01 Published : 2024-09-25

Keywords: Disturbance, Cohesion, Biological cementation, Calcit, Friction angle,

Abstract :

With the population growth and consequently the requirement for development of civil constructions, it is necessary to design appropriate foundations for resisting structural loads. Soil weakness in bearing capacity of geotechnical elements has forced the researchers to continuously follow a solution to compensate for this deficiency. Within the past two decades, many studies have been carried out regarding the performance of this technique in optimization of the soil. One technique which is nowadays highly considered due to compatibility with the environment, high efficiency and low cost, is Biological Optimization Technique. One of the characteristics of this type of optimization is its ability for recovering after disturbance. In this research it has been tried to analyze the behavior of cemented specimens after disturbance and reconstruction. For this purpose, after construction of cubic specimens with dimensions of 2*6*6 cm and applying the disturbance and reconstruction, their shear strength under different vertical stresses has been evaluated by direct shear test.

References:

[1]    Whiffin, Victoria S. Microbial CaCO3 precipitation for the production of biocement. Diss. Murdoch University, 2004.

[2] Chunxiang, Qian, et al. "Corrosion protection of cement-based building materials by surface deposition of CaCO3 by Bacillus pasteurii." Materials Science and Engineering: C 29.4 (2009): 1273-128

[3] Harkes, Marien P., et al. "Fixation and distribution of bacterial activity in sand to induce carbonate precipitation for ground reinforcement." Ecological Engineering 36.2 (2010): 112-117.

[4] Okwadha, George DO, and Jin Li. "Optimum conditions for microbial carbonate precipitation." Chemosphere 81.9 (2010): 1143-1148.

[5] DeJong, Jason T., et al. "Bio-mediated soil improvement." Ecological Engineering 36.2 (2010): 197-210.

[6] Al Qabany, Ahmed, Kenichi Soga, and Carlos Santamarina. "Factors affecting efficiency of microbially induced calcite precipitation." Journal of Geotechnical and Geoenvironmental Engineering 138.8 (2011): 992-1001.

[7] Lin, Hai, et al. "Mechanical behavior of sands treated by microbially induced carbonate precipitation." Journal of Geotechnical and Geoenvironmental Engineering 142.2 (2015): 04015066.

[8] Achal, Varenyam, M. Sudhakara Reddy, and P. C. Basu. "Microbial remediation of defects in building materials and structures." (2010).

[9]   Sharma, Animesh, and R. Ramkrishnan. "Study on effect of microbial induced calcite precipitates on strength of fine grained soils." Perspectives in Science 8 (2016): 198-202.