蛇纹石基固碳轻质土制备与物理力学性能研究

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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 words： soil 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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