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Performance evaluation of lime and microbial cementation in residual soil improvement

Microbially Induced Calcite Precipitation (MICP) is a technique that utilizes the concept of microbial involvements in calcium carbonate precipitation within the soil matrix structure. This leads to the cementation of the soil particles and consequently improving the strength and stiffness of the so...

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Main Authors: Umar, M., Kassim, K. A., Zango, M. U., Muhammed, A. S.
Format: Conference or Workshop Item
Language:English
Published: 2019
Subjects:
TA Engineering (General). Civil engineering (General)
Online Access:http://eprints.utm.my/id/eprint/91122/1/MuttaqaUbaZango2019_PerformanceEvaluationofLime.pdf
http://eprints.utm.my/id/eprint/91122/
http://www.dx.doi.org/10.1088/1757-899X/527/1/012005
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spelling my.utm.911222021-05-31T13:21:40Z http://eprints.utm.my/id/eprint/91122/ Performance evaluation of lime and microbial cementation in residual soil improvement Umar, M. Kassim, K. A. Zango, M. U. Muhammed, A. S. TA Engineering (General). Civil engineering (General) Microbially Induced Calcite Precipitation (MICP) is a technique that utilizes the concept of microbial involvements in calcium carbonate precipitation within the soil matrix structure. This leads to the cementation of the soil particles and consequently improving the strength and stiffness of the soil. In this study microbial carbonate precipitations were induced in tropical residual soil via urea hydrolysis. An isolate of urease active strain of Klebsiella pneumoniae UM123 was used to precipitates calcite into the soil with the aim of improving the engineering properties of the soil. Bacteria concentrations of 2.9 × 106 cfu/ml and 0.5 M cementation reagents concentrations were used to evaluate the strength and hydraulic conductivity of the soil. Treatment durations of 24, 36, 48 and 60 hours were used in the study. The results obtained indicated a general increase in the strength and reduction of hydraulic conductivity of the treated soil with the increase in treatment durations up to 48 hours. It was also revealed that the higher the amount of calcite precipitated the more the strength improvement and reduction of hydraulic conductivity. Appropriate percentage of lime that satisfied the initial consumption and fixation capacity of the soil sample was found to be 6%. Though, combination of MICP with lime does not significantly improve the strength at early stage of the treatment, it has substantially reduced the hydraulic conductivity of the treated residual soil particularly at the early curing period when lime alone increases the hydraulic conductivity. 2019 Conference or Workshop Item PeerReviewed application/pdf en http://eprints.utm.my/id/eprint/91122/1/MuttaqaUbaZango2019_PerformanceEvaluationofLime.pdf Umar, M. and Kassim, K. A. and Zango, M. U. and Muhammed, A. S. (2019) Performance evaluation of lime and microbial cementation in residual soil improvement. In: 11th International Conference on Geotechnical Engineering in Tropical Regions, GEOTROPIKA 2019 and 1st International Conference on Highway and Transportation Engineering, ICHITRA 2019, 27-28 Feb 2019, Kuala Lumpur, Malaysia. http://www.dx.doi.org/10.1088/1757-899X/527/1/012005
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
language English
topic TA Engineering (General). Civil engineering (General)
spellingShingle TA Engineering (General). Civil engineering (General)
Umar, M.
Kassim, K. A.
Zango, M. U.
Muhammed, A. S.
Performance evaluation of lime and microbial cementation in residual soil improvement
description Microbially Induced Calcite Precipitation (MICP) is a technique that utilizes the concept of microbial involvements in calcium carbonate precipitation within the soil matrix structure. This leads to the cementation of the soil particles and consequently improving the strength and stiffness of the soil. In this study microbial carbonate precipitations were induced in tropical residual soil via urea hydrolysis. An isolate of urease active strain of Klebsiella pneumoniae UM123 was used to precipitates calcite into the soil with the aim of improving the engineering properties of the soil. Bacteria concentrations of 2.9 × 106 cfu/ml and 0.5 M cementation reagents concentrations were used to evaluate the strength and hydraulic conductivity of the soil. Treatment durations of 24, 36, 48 and 60 hours were used in the study. The results obtained indicated a general increase in the strength and reduction of hydraulic conductivity of the treated soil with the increase in treatment durations up to 48 hours. It was also revealed that the higher the amount of calcite precipitated the more the strength improvement and reduction of hydraulic conductivity. Appropriate percentage of lime that satisfied the initial consumption and fixation capacity of the soil sample was found to be 6%. Though, combination of MICP with lime does not significantly improve the strength at early stage of the treatment, it has substantially reduced the hydraulic conductivity of the treated residual soil particularly at the early curing period when lime alone increases the hydraulic conductivity.
format Conference or Workshop Item
author Umar, M.
Kassim, K. A.
Zango, M. U.
Muhammed, A. S.
author_facet Umar, M.
Kassim, K. A.
Zango, M. U.
Muhammed, A. S.
author_sort Umar, M.
title Performance evaluation of lime and microbial cementation in residual soil improvement
title_short Performance evaluation of lime and microbial cementation in residual soil improvement
title_full Performance evaluation of lime and microbial cementation in residual soil improvement
title_fullStr Performance evaluation of lime and microbial cementation in residual soil improvement
title_full_unstemmed Performance evaluation of lime and microbial cementation in residual soil improvement
title_sort performance evaluation of lime and microbial cementation in residual soil improvement
publishDate 2019
url http://eprints.utm.my/id/eprint/91122/1/MuttaqaUbaZango2019_PerformanceEvaluationofLime.pdf
http://eprints.utm.my/id/eprint/91122/
http://www.dx.doi.org/10.1088/1757-899X/527/1/012005
_version_ 1702169648235020288
score 13.211869

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