首页|Dredged marine soil stabilization using magnesia cement augmented with biochar/slag

Dredged marine soil stabilization using magnesia cement augmented with biochar/slag

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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 condi-tions.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 carbon-ated 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 per-manent fixation of significant amounts of CO2 in soils through mineral carbonation,potentially reducing environmental pollution while meeting urbanization needs.

Dredged marine soilCO2 uptakeReactive magnesiaBiocharGround granulated blast-furnace slag

Chikezie Chimere Onyekwena、Qi Li、Yong Wang、Ishrat Hameed Alvi、Wentao Li、Yunlu Hou、Xianwei Zhang、Min Zhang

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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,China

School of Civil Engineering,Architecture and Environment,Hubei University of Technology,Wuhan,430068,China

School of Urban Construction,Wuhan University of Science and Technology,Wuhan,430065,China

School of Civil Engineering and Archtitecture,Henan University,Kaifeng,475001,China

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Creative Groups of Natural Science Foundation of Hubei Province

2021CFA030

2024

10.1016/j.jrmge.2023.05.005

岩石力学与岩土工程学报(英文版)
中国科学院武汉岩土力学所中国岩石力学与工程学会武汉大学

岩石力学与岩土工程学报(英文版)

CSTPCD
影响因子：0.404
ISSN：1674-7755
年,卷(期)：2024.16(3)
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