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Study on the Solidification Effect of Dredger Fill by Microbial-Induced Calcium Precipitation (MICP)
This paper puts forward a new soft soil reinforcement technology—microbial-induced calcite precipitation (MICP) technology—which considers the problem of dredger fill soft-soil reinforcement in Dalian Taiping Bay. In this paper, the calcium carbonate content (CCC) and unconfined compressive strength...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9697214/ https://www.ncbi.nlm.nih.gov/pubmed/36431377 http://dx.doi.org/10.3390/ma15227891 |
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author | Li, Jun Tian, Lijun Xu, Yan Tian, Zefeng Zhang, Zhendong |
author_facet | Li, Jun Tian, Lijun Xu, Yan Tian, Zefeng Zhang, Zhendong |
author_sort | Li, Jun |
collection | PubMed |
description | This paper puts forward a new soft soil reinforcement technology—microbial-induced calcite precipitation (MICP) technology—which considers the problem of dredger fill soft-soil reinforcement in Dalian Taiping Bay. In this paper, the calcium carbonate content (CCC) and unconfined compressive strength (UCS) of microbial solidified dredger fill (MSDF) samples were determined using laboratory experiments. The microstructure and chemical composition of MSDF samples were studied by SEM–EDS and XRD. The failure and reinforcement mechanism of MSDF under different experimental conditions (ambient temperature, cementation solution concentration, and clay content) were investigated. The results showed that there was a certain residual strength after the peak strength of MSDF. With the increase of ambient temperature, the number of microorganisms increased, but the activities of urease, CCC, and UCS decreased. The UCS and CCC increased with the increase of cementation solution concentration, while they first increased and then decreased with the increase of clay content. The clay content enhanced the compactness of MSDF samples but reduced the soil permeability and weakened the mineralization. There were significant differences in the morphology of microbial-induced precipitation caused by different concentrations of cementation solution. |
format | Online Article Text |
id | pubmed-9697214 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-96972142022-11-26 Study on the Solidification Effect of Dredger Fill by Microbial-Induced Calcium Precipitation (MICP) Li, Jun Tian, Lijun Xu, Yan Tian, Zefeng Zhang, Zhendong Materials (Basel) Article This paper puts forward a new soft soil reinforcement technology—microbial-induced calcite precipitation (MICP) technology—which considers the problem of dredger fill soft-soil reinforcement in Dalian Taiping Bay. In this paper, the calcium carbonate content (CCC) and unconfined compressive strength (UCS) of microbial solidified dredger fill (MSDF) samples were determined using laboratory experiments. The microstructure and chemical composition of MSDF samples were studied by SEM–EDS and XRD. The failure and reinforcement mechanism of MSDF under different experimental conditions (ambient temperature, cementation solution concentration, and clay content) were investigated. The results showed that there was a certain residual strength after the peak strength of MSDF. With the increase of ambient temperature, the number of microorganisms increased, but the activities of urease, CCC, and UCS decreased. The UCS and CCC increased with the increase of cementation solution concentration, while they first increased and then decreased with the increase of clay content. The clay content enhanced the compactness of MSDF samples but reduced the soil permeability and weakened the mineralization. There were significant differences in the morphology of microbial-induced precipitation caused by different concentrations of cementation solution. MDPI 2022-11-08 /pmc/articles/PMC9697214/ /pubmed/36431377 http://dx.doi.org/10.3390/ma15227891 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Li, Jun Tian, Lijun Xu, Yan Tian, Zefeng Zhang, Zhendong Study on the Solidification Effect of Dredger Fill by Microbial-Induced Calcium Precipitation (MICP) |
title | Study on the Solidification Effect of Dredger Fill by Microbial-Induced Calcium Precipitation (MICP) |
title_full | Study on the Solidification Effect of Dredger Fill by Microbial-Induced Calcium Precipitation (MICP) |
title_fullStr | Study on the Solidification Effect of Dredger Fill by Microbial-Induced Calcium Precipitation (MICP) |
title_full_unstemmed | Study on the Solidification Effect of Dredger Fill by Microbial-Induced Calcium Precipitation (MICP) |
title_short | Study on the Solidification Effect of Dredger Fill by Microbial-Induced Calcium Precipitation (MICP) |
title_sort | study on the solidification effect of dredger fill by microbial-induced calcium precipitation (micp) |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9697214/ https://www.ncbi.nlm.nih.gov/pubmed/36431377 http://dx.doi.org/10.3390/ma15227891 |
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