Retarding effect of concentration of cementation solution on biocementation of soil
Concentration of cementation solution (CCS) is one of the key factors influencing the cementation effect on soil improvement through the microbially induced carbonate precipitation (MICP) process. To precipitate more calcium carbonate per treatment, a higher CCS is needed. However, the MICP process...
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sg-ntu-dr.10356-1601942022-07-14T07:39:21Z Retarding effect of concentration of cementation solution on biocementation of soil Lai, Han-Jiang Cui, Ming-Juan Wu, Shifan Yang, Yang Chu, Jian School of Civil and Environmental Engineering Engineering::Environmental engineering Bonding Strength Calcium Carbonate Concentration of cementation solution (CCS) is one of the key factors influencing the cementation effect on soil improvement through the microbially induced carbonate precipitation (MICP) process. To precipitate more calcium carbonate per treatment, a higher CCS is needed. However, the MICP process may be retarded or even terminated with an increase in CCS. This retarding effect can be a major limitation for the MICP-based soil treatment and thus needs to be understood properly. This paper presents a systematic study on the conditions causing retarding and its effect on biocementation. The test results of this study have identified that there is retarding effect of CCS on the MICP process, showing that the calcium conversion efficiency, which represents the amount of calcium that has been converted into calcium carbonate in each treatment, reduces with the increase in CCS, and the concentration of calcium is the control factor. The retarding effect will dominate increasingly when CCS is higher than 1.0 M and the amount of calcium carbonate precipitation will reduce for the given amount and type of bacteria used in this study and become zero with CCS of 2.5 M. For the same calcium carbonate content, the unconfined compressive strength is greater for sand treated using a lower CCS as the contribution to the bonding strength by the calcium carbonate generated under a lower CCS is greater than that under a higher CCS. Ministry of Education (MOE) Singapore Maritime Institute (SMI) The authors would like to thank the financial support through Grant No. MOE2015-T2-2-142 provided by the Ministry of Education, Singapore, and Grant No. SMI-2018-MA-02 by the Singapore Maritime Institute. The first two authors would also like to thank the support by the National Natural Science Foundation of China (NSFC) (No. 51708243) and the China Postdoctoral Science Foundation (No. 2018M632862) for the early stage of their research. 2022-07-14T07:39:21Z 2022-07-14T07:39:21Z 2021 Journal Article Lai, H., Cui, M., Wu, S., Yang, Y. & Chu, J. (2021). Retarding effect of concentration of cementation solution on biocementation of soil. Acta Geotechnica, 16(5), 1457-1472. https://dx.doi.org/10.1007/s11440-021-01149-1 1861-1125 https://hdl.handle.net/10356/160194 10.1007/s11440-021-01149-1 2-s2.0-85100509205 5 16 1457 1472 en MOE2015-T2-2-142 SMI-2018-MA-02 Acta Geotechnica © 2021 The Author(s), under exclusive licence to Springer-Verlag GmbH, DE part of Springer Nature. All rights reserved. |
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Engineering::Environmental engineering Bonding Strength Calcium Carbonate Lai, Han-Jiang Cui, Ming-Juan Wu, Shifan Yang, Yang Chu, Jian Retarding effect of concentration of cementation solution on biocementation of soil |
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Concentration of cementation solution (CCS) is one of the key factors influencing the cementation effect on soil improvement through the microbially induced carbonate precipitation (MICP) process. To precipitate more calcium carbonate per treatment, a higher CCS is needed. However, the MICP process may be retarded or even terminated with an increase in CCS. This retarding effect can be a major limitation for the MICP-based soil treatment and thus needs to be understood properly. This paper presents a systematic study on the conditions causing retarding and its effect on biocementation. The test results of this study have identified that there is retarding effect of CCS on the MICP process, showing that the calcium conversion efficiency, which represents the amount of calcium that has been converted into calcium carbonate in each treatment, reduces with the increase in CCS, and the concentration of calcium is the control factor. The retarding effect will dominate increasingly when CCS is higher than 1.0 M and the amount of calcium carbonate precipitation will reduce for the given amount and type of bacteria used in this study and become zero with CCS of 2.5 M. For the same calcium carbonate content, the unconfined compressive strength is greater for sand treated using a lower CCS as the contribution to the bonding strength by the calcium carbonate generated under a lower CCS is greater than that under a higher CCS. |
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School of Civil and Environmental Engineering |
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School of Civil and Environmental Engineering Lai, Han-Jiang Cui, Ming-Juan Wu, Shifan Yang, Yang Chu, Jian |
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Article |
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Lai, Han-Jiang Cui, Ming-Juan Wu, Shifan Yang, Yang Chu, Jian |
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Lai, Han-Jiang |
title |
Retarding effect of concentration of cementation solution on biocementation of soil |
title_short |
Retarding effect of concentration of cementation solution on biocementation of soil |
title_full |
Retarding effect of concentration of cementation solution on biocementation of soil |
title_fullStr |
Retarding effect of concentration of cementation solution on biocementation of soil |
title_full_unstemmed |
Retarding effect of concentration of cementation solution on biocementation of soil |
title_sort |
retarding effect of concentration of cementation solution on biocementation of soil |
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2022 |
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https://hdl.handle.net/10356/160194 |
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