Dredged marine soil stabilization using magnesia cement augmented with biochar/slag
Dredged marine soils (DMS) have poor engineering properties, which limit their usage in construction projects. This research examines the application of reactive magnesia (rMgO) containing supplementary cementitious materials (SCMs) to stabilize DMS under ambient and carbon dioxide (CO2) curing cond...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2024-03-01
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| Series: | Journal of Rock Mechanics and Geotechnical Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674775523001622 |
| _version_ | 1797262961728815104 |
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| author | Chikezie Chimere Onyekwena Qi Li Yong Wang Ishrat Hameed Alvi Wentao Li Yunlu Hou Xianwei Zhang Min Zhang |
| author_facet | Chikezie Chimere Onyekwena Qi Li Yong Wang Ishrat Hameed Alvi Wentao Li Yunlu Hou Xianwei Zhang Min Zhang |
| author_sort | Chikezie Chimere Onyekwena |
| collection | DOAJ |
| description | Dredged marine soils (DMS) have poor engineering properties, which limit their usage in construction projects. This research examines the application of reactive magnesia (rMgO) containing supplementary cementitious materials (SCMs) to stabilize DMS under ambient and carbon dioxide (CO2) curing conditions. Several proprietary experimental tests were conducted to investigate the stabilized DMS. Furthermore, the carbonation-induced mineralogical, thermal, and microstructural properties change of the samples were explored. The findings show that the compressive strength of the stabilized DMS fulfilled the 7-d requirement (0.7–2.1 MPa) for pavement and building foundations. Replacing rMgO with SCMs such as biochar or ground granulated blast-furnace slag (GGBS) altered the engineering properties and particle packing of the stabilized soils, thus influencing their performances. Biochar increased the porosity of the samples, facilitating higher CO2 uptake and improved ductility, while GGBS decreased porosity and increased the dry density of the samples, resulting in higher strength. The addition of SCMs also enhanced the water retention capacity and modified the pH of the samples. Microstructural analysis revealed that the hydrated magnesium carbonates precipitated in the carbonated samples provided better cementation effects than brucite formed during rMgO hydration. Moreover, incorporating SCMs reduced the overall global warming potential and energy demand of the rMgO-based systems. The biochar mixes demonstrated lower toxicity and energy consumption. Ultimately, the rMgO and biochar blend can serve as an environmentally friendly additive for soft soil stabilization and permanent fixation of significant amounts of CO2 in soils through mineral carbonation, potentially reducing environmental pollution while meeting urbanization needs. |
| first_indexed | 2024-04-25T00:05:26Z |
| format | Article |
| id | doaj.art-fd9fd9616c3945b388c06127dbda4da8 |
| institution | Directory Open Access Journal |
| issn | 1674-7755 |
| language | English |
| last_indexed | 2024-04-25T00:05:26Z |
| publishDate | 2024-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Rock Mechanics and Geotechnical Engineering |
| spelling | doaj.art-fd9fd9616c3945b388c06127dbda4da82024-03-14T06:14:15ZengElsevierJournal of Rock Mechanics and Geotechnical Engineering1674-77552024-03-0116310001017Dredged marine soil stabilization using magnesia cement augmented with biochar/slagChikezie Chimere Onyekwena0Qi Li1Yong Wang2Ishrat Hameed Alvi3Wentao Li4Yunlu Hou5Xianwei Zhang6Min Zhang7State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China; University of Chinese Academy of Sciences, Beijing, 100049, ChinaState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Corresponding author. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China; University of Chinese Academy of Sciences, Beijing, 100049, ChinaState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China; University of Chinese Academy of Sciences, Beijing, 100049, ChinaSchool of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan, 430068, ChinaState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China; University of Chinese Academy of Sciences, Beijing, 100049, ChinaState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China; School of Urban Construction, Wuhan University of Science and Technology, Wuhan, 430065, ChinaSchool of Civil Engineering and Archtitecture, Henan University, Kaifeng, 475001, China; Corresponding author.Dredged marine soils (DMS) have poor engineering properties, which limit their usage in construction projects. This research examines the application of reactive magnesia (rMgO) containing supplementary cementitious materials (SCMs) to stabilize DMS under ambient and carbon dioxide (CO2) curing conditions. Several proprietary experimental tests were conducted to investigate the stabilized DMS. Furthermore, the carbonation-induced mineralogical, thermal, and microstructural properties change of the samples were explored. The findings show that the compressive strength of the stabilized DMS fulfilled the 7-d requirement (0.7–2.1 MPa) for pavement and building foundations. Replacing rMgO with SCMs such as biochar or ground granulated blast-furnace slag (GGBS) altered the engineering properties and particle packing of the stabilized soils, thus influencing their performances. Biochar increased the porosity of the samples, facilitating higher CO2 uptake and improved ductility, while GGBS decreased porosity and increased the dry density of the samples, resulting in higher strength. The addition of SCMs also enhanced the water retention capacity and modified the pH of the samples. Microstructural analysis revealed that the hydrated magnesium carbonates precipitated in the carbonated samples provided better cementation effects than brucite formed during rMgO hydration. Moreover, incorporating SCMs reduced the overall global warming potential and energy demand of the rMgO-based systems. The biochar mixes demonstrated lower toxicity and energy consumption. Ultimately, the rMgO and biochar blend can serve as an environmentally friendly additive for soft soil stabilization and permanent fixation of significant amounts of CO2 in soils through mineral carbonation, potentially reducing environmental pollution while meeting urbanization needs.http://www.sciencedirect.com/science/article/pii/S1674775523001622Dredged marine soilCO2 uptakeReactive magnesiaBiocharGround granulated blast-furnace slag |
| spellingShingle | Chikezie Chimere Onyekwena Qi Li Yong Wang Ishrat Hameed Alvi Wentao Li Yunlu Hou Xianwei Zhang Min Zhang Dredged marine soil stabilization using magnesia cement augmented with biochar/slag Journal of Rock Mechanics and Geotechnical Engineering Dredged marine soil CO2 uptake Reactive magnesia Biochar Ground granulated blast-furnace slag |
| title | Dredged marine soil stabilization using magnesia cement augmented with biochar/slag |
| title_full | Dredged marine soil stabilization using magnesia cement augmented with biochar/slag |
| title_fullStr | Dredged marine soil stabilization using magnesia cement augmented with biochar/slag |
| title_full_unstemmed | Dredged marine soil stabilization using magnesia cement augmented with biochar/slag |
| title_short | Dredged marine soil stabilization using magnesia cement augmented with biochar/slag |
| title_sort | dredged marine soil stabilization using magnesia cement augmented with biochar slag |
| topic | Dredged marine soil CO2 uptake Reactive magnesia Biochar Ground granulated blast-furnace slag |
| url | http://www.sciencedirect.com/science/article/pii/S1674775523001622 |
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