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  2025, Vol. 44 Issue (2): 472-481    DOI:
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Research on the preparation method and physical-mechanical properties of serpentine-based carbon sequestration lightweight soils
LIU Songyu1,2,3,YUAN Zhenyang1,2,ZHANG Xiang1,2,WANG Zhengcheng1,2,GUO Zhaoyuan1,2,LI Yitong1,2
(1. Institute of Geotechnical Engineering,Southeast University,Nanjing,Jiangsu 211189,China;2. Jiangsu Key Laboratory of Urban Underground Engineering and Environmental Safety,Southeast University,Nanjing,Jiangsu 211189,China;
3. Nanjing Modern Multimodal Transportation Laboratory,Nanjing,Jiangsu 210004,China)
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Abstract  To reduce carbon emissions and costs in the production of lightweight foam soils,a serpentine-based carbon sequestration lightweight soil(S-LS) technology that utilizes serpentine tailings,magnesium oxide,and muck as solidifying agents,with carbon dioxide as foaming gas was proposed. The effects of serpentine content,water-solid ratio and wet density on the physical and mechanical properties of S-LS were investigated through laboratory tests. Additionally,the strength formation mechanism and microscopic characteristics of S-LS were analyzed. The results indicate that the CO2 foam can promote the self-carbonation,and the addition of serpentine tailings effectively can improve the workability of slurry. As serpentine content and water-solid ratio increase,and wet density decreases,the flow value of S-LS increases while unconfined compressive strength decreases. In this study,the optimal mix design of S-LS was identified as:serpentine content of 30%,water-solid ratio of 0.55,and wet density of 800 kg/m3. Corresponding to 28 days,the unconfined compressive strength reaches 1.34 MPa,which follows the strength requirements for most foam lightweight soil filling applications. The proposed S-LS technology enhances carbon sequestration and improves solid waste utilization,showing strong potential for engineering application.
Key wordssoil mechanics      CO2 carbonation      serpentine tailings      foam lightweight soil      preparation processes      physical and mechanical properties     
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Articles by authors
LIU Songyu1
2
3
YUAN Zhenyang1
2
ZHANG Xiang1
2
WANG Zhengcheng1
2
GUO Zhaoyuan1
2
LI Yitong1
2
Cite this article:   
LIU Songyu1,2,3, et al. Research on the preparation method and physical-mechanical properties of serpentine-based carbon sequestration lightweight soils[J]. , 2025, 44(2): 472-481.
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https://rockmech.whrsm.ac.cn/EN/Y2025/V44/I2/472
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