蛇纹石基固碳轻质土制备与物理力学性能研究

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摘要为减少泡沫轻质土生产过程中的碳排放并降低成本，提出利用蛇纹石尾矿、氧化镁与渣土作为固化材料，CO2作为发泡气体，制备蛇纹石基固碳泡沫轻质土(S-LS)技术。通过室内试验研究蛇纹石掺量、水固比及湿密度对S-LS物理力学特性的影响规律，分析S-LS的强度形成机制及化学反应微观模型。结果表明，CO2发泡泡沫破碎后可实现S-LS自碳化，蛇纹石尾矿的掺入则可有效改善浆液的和易性；随着蛇纹石掺量、水固比的提高及湿密度减小，S-LS的流值增大，无侧限抗压强度降低。基于物理力学性能，给出S-LS的最优配比建议值：蛇纹石掺量30%、水固比0.55、湿密度800 kg/m3。试验研究指出，轻质土28 d龄期的无侧限抗压强度达1.34 MPa，可满足绝大多数轻质土填筑应用场景所需强度要求，实现固废利用与协同固碳，具有推广应用前景。

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	刘松玉1
	2
	3
	袁振扬1
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	张翔1
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	王正成1
	2
	郭赵元1
	2
	李艺彤1
	2

关键词 ：土力学, CO2碳化, 蛇纹石尾矿, 泡沫轻质土, 制备工艺, 物理力学特性

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

引用本文:

刘松玉1，2，3，袁振扬1，2，张翔1，2，王正成1，2，郭赵元1，2，李艺彤1，2. 蛇纹石基固碳轻质土制备与物理力学性能研究[J]. 岩石力学与工程学报, 2025, 44(2): 472-481.
LIU Songyu1，2，3，YUAN Zhenyang1，2，ZHANG Xiang1，2，WANG Zhengcheng1，2，GUO Zhaoyuan1，2，LI Yitong1，2. Research on the preparation method and physical-mechanical properties of serpentine-based carbon sequestration lightweight soils. , 2025, 44(2): 472-481.

链接本文:

https://rockmech.whrsm.ac.cn/CN/Y2025/V44/I2/472

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