Investigation on Water Transformation and Pore Structure of Cement-Stabilized Dredged Sediment Based on NMR Technology
Cement-stabilized dredged sediment (CDS) when used as a new road construction material cannot only solve the problem of abandoned sediment disposal, but also effectively save natural soil resources. This study aimed to evaluate the strength and permeability of CDS and establish corresponding predict...
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MDPI AG
2022-04-01
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| Online Access: | https://www.mdpi.com/1996-1944/15/9/3178 |
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| author | Shiquan Wang Xingxing He Guanghua Cai Lei Lang Hongrui Ma Shunmei Gong Zhiyong Niu |
| author_facet | Shiquan Wang Xingxing He Guanghua Cai Lei Lang Hongrui Ma Shunmei Gong Zhiyong Niu |
| author_sort | Shiquan Wang |
| collection | DOAJ |
| description | Cement-stabilized dredged sediment (CDS) when used as a new road construction material cannot only solve the problem of abandoned sediment disposal, but also effectively save natural soil resources. This study aimed to evaluate the strength and permeability of CDS and establish corresponding prediction models from the perspective of a stabilization mechanism. The soil–water composition and pore size distribution were investigated by the nuclear magnetic resonance (NMR) technique. The results demonstrated that more liquid pore water inside the CDS specimen transformed into combined water with cement hydration. The amount of combined water, which essentially characterized the hydration process of cement, presented a linear relationship with log (<i>t</i>). The cementation and filling action of hydrates resulted in the transformation of large pores into smaller ones, hence the optimal pore size decreased with an increasing curing period and cement content. The stress–strain curves and hydraulic conductivity were determined based on unconfined compression and flexible wall penetration tests, respectively. The unconfined compressive strength increased exponentially with the amount of combined water, and the functional correlations of hydraulic conductivity and micropore parameters were established. The reliability of the NMR technique as a new method to study the microscopic evolution mechanism of the strength and permeability of CDS was further verified by scanning electron microscopy and mercury intrusion porosimetry tests. |
| first_indexed | 2024-03-10T03:58:34Z |
| format | Article |
| id | doaj.art-7bdf28a338574fb4868006062604e263 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T03:58:34Z |
| publishDate | 2022-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-7bdf28a338574fb4868006062604e2632023-11-23T08:39:23ZengMDPI AGMaterials1996-19442022-04-01159317810.3390/ma15093178Investigation on Water Transformation and Pore Structure of Cement-Stabilized Dredged Sediment Based on NMR TechnologyShiquan Wang0Xingxing He1Guanghua Cai2Lei Lang3Hongrui Ma4Shunmei Gong5Zhiyong Niu6National Engineering Research Center of Coal Mine Water Hazard Controlling, School of Resources and Civil Engineering, Suzhou University, Suzhou 234000, ChinaState Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, ChinaSchool of Civil Engineering, Nanjing Forestry University, Nanjing 210037, ChinaState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, ChinaNational Engineering Research Center of Coal Mine Water Hazard Controlling, School of Resources and Civil Engineering, Suzhou University, Suzhou 234000, ChinaNational Engineering Research Center of Coal Mine Water Hazard Controlling, School of Resources and Civil Engineering, Suzhou University, Suzhou 234000, ChinaNational Engineering Research Center of Coal Mine Water Hazard Controlling, School of Resources and Civil Engineering, Suzhou University, Suzhou 234000, ChinaCement-stabilized dredged sediment (CDS) when used as a new road construction material cannot only solve the problem of abandoned sediment disposal, but also effectively save natural soil resources. This study aimed to evaluate the strength and permeability of CDS and establish corresponding prediction models from the perspective of a stabilization mechanism. The soil–water composition and pore size distribution were investigated by the nuclear magnetic resonance (NMR) technique. The results demonstrated that more liquid pore water inside the CDS specimen transformed into combined water with cement hydration. The amount of combined water, which essentially characterized the hydration process of cement, presented a linear relationship with log (<i>t</i>). The cementation and filling action of hydrates resulted in the transformation of large pores into smaller ones, hence the optimal pore size decreased with an increasing curing period and cement content. The stress–strain curves and hydraulic conductivity were determined based on unconfined compression and flexible wall penetration tests, respectively. The unconfined compressive strength increased exponentially with the amount of combined water, and the functional correlations of hydraulic conductivity and micropore parameters were established. The reliability of the NMR technique as a new method to study the microscopic evolution mechanism of the strength and permeability of CDS was further verified by scanning electron microscopy and mercury intrusion porosimetry tests.https://www.mdpi.com/1996-1944/15/9/3178dredged sedimentcement-stabilizedNMRpermeabilitystrengthpore structure |
| spellingShingle | Shiquan Wang Xingxing He Guanghua Cai Lei Lang Hongrui Ma Shunmei Gong Zhiyong Niu Investigation on Water Transformation and Pore Structure of Cement-Stabilized Dredged Sediment Based on NMR Technology Materials dredged sediment cement-stabilized NMR permeability strength pore structure |
| title | Investigation on Water Transformation and Pore Structure of Cement-Stabilized Dredged Sediment Based on NMR Technology |
| title_full | Investigation on Water Transformation and Pore Structure of Cement-Stabilized Dredged Sediment Based on NMR Technology |
| title_fullStr | Investigation on Water Transformation and Pore Structure of Cement-Stabilized Dredged Sediment Based on NMR Technology |
| title_full_unstemmed | Investigation on Water Transformation and Pore Structure of Cement-Stabilized Dredged Sediment Based on NMR Technology |
| title_short | Investigation on Water Transformation and Pore Structure of Cement-Stabilized Dredged Sediment Based on NMR Technology |
| title_sort | investigation on water transformation and pore structure of cement stabilized dredged sediment based on nmr technology |
| topic | dredged sediment cement-stabilized NMR permeability strength pore structure |
| url | https://www.mdpi.com/1996-1944/15/9/3178 |
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