Study on effect of Microbial Induced Calcite Precipitates on strength of fine grained soils

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• 作者：Animesh Sharma^a ; ^{animesharma009@yahoo.com" class="auth_mail" title="E-mail the corresponding author} ; Ramkrishnan R.^b ; ¹ ; ^{r_ramkrishnan@cb.amrita.edu" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Soil Stabilisation ; Soil Strength ; Microbial Induced Calcite Precipitation ; Unconfined compressive strength ; Bacillus pasteurii
• 刊名：Perspectives in Science
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：8
• 期：Complete
• 页码：198-202
• 全文大小：633 K

文摘

For construction purposes, it is very essential to provide a strong foundation for the structure. If required, the suitability of soil has to be improved; this process of improving properties of soil is called Soil Stabilisation. This study intends to experimentally analyse the effectiveness of use of an unorthodox liquid soil stabiliser, Microbial Induced Calcite Precipitates (MICP) for improving the shear strength parameters of two different types of fine grained soils. For this process, a species of Bacillus group, B. pastuerii was used to activate and catalyse the calcite precipitation caused by reaction between urea and calcium chloride. Two types of soils, i.e. intermediate compressible clay and highly compressible clay were used for the study. Parameters included concentration of B. pasteurii, concentration of the cementation reagent and duration of treatment. These parameters were applied on both the soils in a specified range in order to optimise their usage. The results proved that with the use of MICP, there was a noticeable improvement (1.5–2.9 times) in the unconfined compressive strength of both type of soils. It was also found that the strength increased with an increase in duration of treatment. Based on this study, optimum quantity and concentration of liquid additive to be added for different soil types for better strength increments were established.