Improvement of Strength of Locally Available Soils using Microbial Induced Calcite Precipitation
P. B. Kulkarni1, P. D. Nemade2

1P. B. Kulkarni, Research Scholar, Dr. D.Y. Patil Institute of Technology, Sant Tukaram Nagar Pimpri, Pune
2Dr. P. D. Nemade, Professor, and working as the Principal of S. B. Patil, College of Engineering, Indapur, Dist: Pune
Manuscript received on 15 August 2019. | Revised Manuscript received on 25 August 2019. | Manuscript published on 30 September 2019. | PP: 60-68 | Volume-8 Issue-3 September 2019 | Retrieval Number: C3942098319/19©BEIESP | DOI: 10.35940/ijrte.C3942.098319
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Abstract: Engineering properties of soils are improved by adopting various proven methods such as mechanical and chemical. Strength of locally available soil (Black cotton soil and red soil) was enhanced by application of Microbial Induced Calcite Precipitation (MICP) using species of Bacillus pasteurii. Microbial culture improves the unconfined compressive strength and shear strength of locally available soil. Microbial culture developed from Bacillus pasteurii, was used to stimulate and catalyze the process of calcite precipitation triggered by urea hydrolysis which includes reaction between urea and calcium chloride. This paper includes outcomes of effectiveness of MICP on locally available soil, on three parameters measure of the cementation reagent, measure of Bacillus pasteurii and duration of treatment process. The results elaborated that with the application of MICP, unconfined compressive strength of black cotton soil increased 1.6 to 2.3 times and red soil from 1.8 to 3 times. This gives optimum quantity of microbes and concentration of Cementation reagent as additive to improve strength of black cotton soil and red soil.
Index Terms: Calcite Precipitation, Bacillus pasteurii, Unconfined Compressive Strength, Black Cotton Soil, Red Soil

Scope of the Article:
Soil-Structure Interaction