Calcium ions and calcium carbonate: key regulators of the enzymatic mineralization for soil dispersivity control.
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| Title: | Calcium ions and calcium carbonate: key regulators of the enzymatic mineralization for soil dispersivity control. |
|---|---|
| Authors: | Ren, Guanzhou1,2 (AUTHOR), Meng, Minqiang1,2 (AUTHOR), Fan, Henghui1,2 (AUTHOR) yt07@nwsuaf.edu.cn, Wen, Jixiang1,2 (AUTHOR), Zhang, Jianwei3 (AUTHOR), Zhao, Gaowen4,5 (AUTHOR), Yang, Xiujuan1,2 (AUTHOR), Sun, Zengchun1,2 (AUTHOR), He, Xiang6,7 (AUTHOR) |
| Source: | Acta Geotechnica. Oct2024, Vol. 19 Issue 10, p6661-6682. 22p. |
| Subjects: | Arid soils, Soil solutions, Clay soils, Soil classification, Soil particles, Clay, Calcium ions |
| Abstract: | Dispersive soil is a widely distributed problematic soil in arid or semiarid areas of the world and can cause pipe erosion, gully damage and other seepage failures. This study analyzed the effect of environmentally friendly enzyme-induced carbonate precipitation (EICP) on the dispersivity of dispersive soils. This methodology was tested for the stabilization of three dispersive soil types (two high-sodium soils, two low-clay-content soils, and two soils with both high sodium and low clay contents) to examine the impact on dispersivity based on the results of pinhole tests and mud ball tests. Physical, chemical, mechanical, and microscopic tests were also conducted to investigate the effects of the components in the EICP reaction solution on dispersive soil modification. The experiments showed that the concentration of the reaction solution and the curing time required to limit the dispersivity decreased with increasing clay content in the soil. Ca2+ limited the dispersivities of dispersive soils via four distinct mechanisms. The first mechanism was ion exchange; Ca2+ decreased the percentage of exchangeable sodium ions to less than 7% while reducing the thickness of the diffuse double layer such that the spacings between soil particles were reduced and the chemical dispersivity was limited. Second, Ca2+ increased the viscosity of the solution by salting out the organic matter present in the soybean urease. Subsequently, the D1-class physically dispersive soil was converted into an ND2-class nondispersive soil. Third, Ca2+ decreased the soil pH by reducing the CO32− content, which could hydrolyze to increase the soil alkalinity. Finally, the presence of Ca2+ led to the generation of cementitious minerals through the precipitation of CaCO3 crystals that continuously generated CO32−, filling and cementing soil particles and thereby limiting their physical dispersivity. These results indicated that a low-concentration EICP reaction solution efficiently controlled the dispersivities of the three dispersive soils. [ABSTRACT FROM AUTHOR] |
| Copyright of Acta Geotechnica is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
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| Header | DbId: egs DbLabel: Engineering Source An: 180268615 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Calcium ions and calcium carbonate: key regulators of the enzymatic mineralization for soil dispersivity control. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Ren%2C+Guanzhou%22">Ren, Guanzhou</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Meng%2C+Minqiang%22">Meng, Minqiang</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Fan%2C+Henghui%22">Fan, Henghui</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> yt07@nwsuaf.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Wen%2C+Jixiang%22">Wen, Jixiang</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Jianwei%22">Zhang, Jianwei</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhao%2C+Gaowen%22">Zhao, Gaowen</searchLink><relatesTo>4,5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yang%2C+Xiujuan%22">Yang, Xiujuan</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sun%2C+Zengchun%22">Sun, Zengchun</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22He%2C+Xiang%22">He, Xiang</searchLink><relatesTo>6,7</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Acta+Geotechnica%22">Acta Geotechnica</searchLink>. Oct2024, Vol. 19 Issue 10, p6661-6682. 22p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Arid+soils%22">Arid soils</searchLink><br /><searchLink fieldCode="DE" term="%22Soil+solutions%22">Soil solutions</searchLink><br /><searchLink fieldCode="DE" term="%22Clay+soils%22">Clay soils</searchLink><br /><searchLink fieldCode="DE" term="%22Soil+classification%22">Soil classification</searchLink><br /><searchLink fieldCode="DE" term="%22Soil+particles%22">Soil particles</searchLink><br /><searchLink fieldCode="DE" term="%22Clay%22">Clay</searchLink><br /><searchLink fieldCode="DE" term="%22Calcium+ions%22">Calcium ions</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Dispersive soil is a widely distributed problematic soil in arid or semiarid areas of the world and can cause pipe erosion, gully damage and other seepage failures. This study analyzed the effect of environmentally friendly enzyme-induced carbonate precipitation (EICP) on the dispersivity of dispersive soils. This methodology was tested for the stabilization of three dispersive soil types (two high-sodium soils, two low-clay-content soils, and two soils with both high sodium and low clay contents) to examine the impact on dispersivity based on the results of pinhole tests and mud ball tests. Physical, chemical, mechanical, and microscopic tests were also conducted to investigate the effects of the components in the EICP reaction solution on dispersive soil modification. The experiments showed that the concentration of the reaction solution and the curing time required to limit the dispersivity decreased with increasing clay content in the soil. Ca2+ limited the dispersivities of dispersive soils via four distinct mechanisms. The first mechanism was ion exchange; Ca2+ decreased the percentage of exchangeable sodium ions to less than 7% while reducing the thickness of the diffuse double layer such that the spacings between soil particles were reduced and the chemical dispersivity was limited. Second, Ca2+ increased the viscosity of the solution by salting out the organic matter present in the soybean urease. Subsequently, the D1-class physically dispersive soil was converted into an ND2-class nondispersive soil. Third, Ca2+ decreased the soil pH by reducing the CO32− content, which could hydrolyze to increase the soil alkalinity. Finally, the presence of Ca2+ led to the generation of cementitious minerals through the precipitation of CaCO3 crystals that continuously generated CO32−, filling and cementing soil particles and thereby limiting their physical dispersivity. These results indicated that a low-concentration EICP reaction solution efficiently controlled the dispersivities of the three dispersive soils. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Acta Geotechnica is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
| PLink | https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=180268615 |
| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s11440-024-02304-0 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 22 StartPage: 6661 Subjects: – SubjectFull: Arid soils Type: general – SubjectFull: Soil solutions Type: general – SubjectFull: Clay soils Type: general – SubjectFull: Soil classification Type: general – SubjectFull: Soil particles Type: general – SubjectFull: Clay Type: general – SubjectFull: Calcium ions Type: general Titles: – TitleFull: Calcium ions and calcium carbonate: key regulators of the enzymatic mineralization for soil dispersivity control. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Ren, Guanzhou – PersonEntity: Name: NameFull: Meng, Minqiang – PersonEntity: Name: NameFull: Fan, Henghui – PersonEntity: Name: NameFull: Wen, Jixiang – PersonEntity: Name: NameFull: Zhang, Jianwei – PersonEntity: Name: NameFull: Zhao, Gaowen – PersonEntity: Name: NameFull: Yang, Xiujuan – PersonEntity: Name: NameFull: Sun, Zengchun – PersonEntity: Name: NameFull: He, Xiang IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 10 Text: Oct2024 Type: published Y: 2024 Identifiers: – Type: issn-print Value: 18611125 Numbering: – Type: volume Value: 19 – Type: issue Value: 10 Titles: – TitleFull: Acta Geotechnica Type: main |
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