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dc.contributor.authorCui, Ming-Juanen_US
dc.contributor.authorLai, Han-Jiangen_US
dc.contributor.authorWu, Shifanen_US
dc.contributor.authorChu, Jianen_US
dc.identifier.citationCui, M., Lai, H., Wu, S. & Chu, J. (2022). Comparison of soil improvement methods using crude soybean enzyme, bacterial enzyme or bacteria induced carbonate precipitation. Geotechnique, 1-9.
dc.description.abstractEither microbial or enzyme induced carbonate precipitation (MICP or EICP) has emerged to be alternative to cement-based ground improvement methods. For EICP, either plant urease or bacterial enzyme can be used. The effect of treatments can be different when different methods are adopted. In this study, the soil improvement effects among the three methods were compared. The newly developed one-phase-low-pH method was adopted for both the MICP and EICP processes in this study. The crude urease enzyme was extracted from soybean and urease producing bacteria. The results show that the amount of calcium carbonate induced by the crude soybean urease enzyme is comparable to that produced by bacteria or bacterial urease under the same urease activity. However, the treatment using the crude soybean urease enzyme has the advantage of being more effective in enhancing the strength and reducing the permeability of soil than the other two treatments, especially for the soil with small grain sizes. This can be explained by the difference in the precipitation pattern of calcium carbonate using various urea hydrolysis media.en_US
dc.description.sponsorshipMinistry of Education (MOE)en_US
dc.description.sponsorshipSingapore Maritime Institute (SMI)en_US
dc.rights© 2022 Thomas Telford Ltd. All rights reserved.en_US
dc.subjectEngineering::Civil engineeringen_US
dc.titleComparison of soil improvement methods using crude soybean enzyme, bacterial enzyme or bacteria induced carbonate precipitationen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Civil and Environmental Engineeringen_US
dc.subject.keywordsCarbonate Precipitationen_US
dc.subject.keywordsGround Improvementen_US
dc.description.acknowledgementThe authors would like to express their gratitude for the financial support provided through grant no. MOE2015-T2-2-142 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 National Natural Science Foundation of China (NSFC) for their support (no. 52178319, 52108307).en_US
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