生物炭辅助固化土强度性质的研究进展

doi:10.11896/cldb.25040059

材料导报

2026, Vol. 40

Issue (5): 25040059-8 https://doi.org/10.11896/cldb.25040059

生物质助力建筑材料可持续发展

生物炭辅助固化土强度性质的研究进展

何俊^1,2,*, 左子威¹, 孙思琴¹, 康多运¹, 杨心语¹, 胡晓慧¹

1 湖北工业大学土木建筑与环境学院,武汉 430068;
2 湖北工业大学河湖健康智慧感知与生态修复教育部重点实验室,武汉 430068

Research Development on Strength Properties of Solidified Soil with Biochar as Admixture

HE Jun^1,2,*, ZUO Ziwei¹, SUN Siqin¹, KANG Duoyun¹, YANG Xinyu¹, HU Xiaohui¹

1 School of Civil Engineering, Architectural and Environment, Hubei University of Technology, Wuhan 430068, China;
2 Key Laboratory of Intelligent Health Perception and Ecological Restoration of River and Lake of Ministry of Education, Hubei University of Technology, Wuhan 430068, China

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摘要生物炭作为一种环保富碳材料,在改善混凝土和土壤性能方面的潜力已被认可,但作为水泥/石灰基传统固化土的辅助材料时对固化土强度的影响规律及机理仍不甚明晰,亟需系统性研究。以强度指数(SI,掺生物炭与不掺生物炭时固化土无侧限抗压强度的比值)为评价指标,剖析生物炭性质、土的类型、生物炭掺量、养护龄期等因素对强度指数的综合影响,揭示其微观作用机理。研究表明,孔隙结构发达、吸附性强的细粒木质及农业废弃物生物炭的提升强度效果更优。对于高含水率黏性土,生物炭不仅能调节水分、促进固化剂水化,还能有效填充孔隙,较高掺量下提升强度作用效果增强;对于低含水率土,生物炭发挥内养护作用,但提升强度效果有限,且存在最优掺量阈值。强度提升效果随养护龄期的增加而增强,28 d龄期SI较7 d龄期可提升约21%。这为理解生物炭在固化土中的增强机制提供了理论支撑与量化依据。未来研究应深化生物炭-固化剂-土-水体系的相互作用机制,并拓展其在复杂应力状态(静/动力学性能)及复杂环境(如干湿循环及侵蚀)下的长期耐久性评估。

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	何俊
	左子威
	孙思琴
	康多运
	杨心语
	胡晓慧

关键词: 生物炭固化土辅助材料强度指数影响因素

Abstract: As an eco-friendly carbon-rich material, biochar has demonstrated potential for improving the performance of concrete and soil. However, its influence pattern and underlying mechanisms on the strength of cement/lime-based stabilized soil when used as an auxiliary material remain inadequately understood, necessitating systematic investigation. This study defined strength index (SI)— the ratio of the unconfined compressive strength of biochar-amended stabilized soil to that of the control stabilized soil — as the key evaluation metric. Utilizing this index, the study analyzed the comprehensive influence of biochar properties, soil types, biochar dosage, and curing age, thereby revealing its microscopic mechanism. The results show that biochar derived from fine-grained wood or agricultural waste, characterized by rich pore structure and strong adsorption capacity, yielded superior strength enhancement. For clay soil with high water content, biochar can regulate water content, promote binder hydration, and fill soil pores. Therefore, higher dosage of biochar amplified strength gain. For soil with low water content, biochar can play a role of internal curing, but its effectiveness is limited and required identification of an optimal dosage threshold. Strength improvements intensified with curing age, and SI achieved an increase of approximately 21% at a 28 d curing age compared to that at 7 d. This paper provides theore-tical substantiation and quantitative evidence for understanding the strengthening mechanisms of biochar in soil stabilization. Future studies need to deepen investigations into the interaction mechanisms within the biochar-binder-soil-water system and broaden durability assessments under complex stress states (static/dynamic) and complex environments (e.g., wet-dry cycles or corrosive attack).

Key words: biochar solidified soil admixture strength index influencing factor

出版日期: 2026-03-10 发布日期: 2026-03-10

ZTFLH:

TU42

基金资助: 国家自然科学基金(41772332)

通讯作者: ^*何俊,博士,湖北工业大学土木建筑与环境学院教授、博士研究生导师。目前主要从事环境岩土工程、固体废弃物资源化利用等方面的研究。hjunas@163.com

引用本文:

何俊, 左子威, 孙思琴, 康多运, 杨心语, 胡晓慧. 生物炭辅助固化土强度性质的研究进展[J]. 材料导报, 2026, 40(5): 25040059-8.
HE Jun, ZUO Ziwei, SUN Siqin, KANG Duoyun, YANG Xinyu, HU Xiaohui. Research Development on Strength Properties of Solidified Soil with Biochar as Admixture. Materials Reports, 2026, 40(5): 25040059-8.

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https://www.mater-rep.com/CN/10.11896/cldb.25040059 或 https://www.mater-rep.com/CN/Y2026/V40/I5/25040059

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