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J. Hefei Univ. Tech. (Nat. Sci.)

合肥工业大学学报(自然科学版)

JOURNAL OF HEFEI UNIVERSITY OF TECHNOLOGY (NATURAL SCIENCE)

Competent Authorities: Ministry of Education of the People's Republic of China

Sponsor by: Hefei University of Technology

ISSN 1000-1646, CN 34-1001/N

Engineering properties and environmental effects of copper slag modified expansive soil

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铜渣改良膨胀土的工程性质及环境效应

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Aug.2025, Vol.48 No.8: 1052-1059

DOI: 10.3969/j.issn.1003-5060.2025.08.007

Authors

WU Jie, ZHA Fusheng, KANG Bo

(School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China)

Abstract and Keywords

Abstract: Excessive stockpiling of copper slag, an industrial solid waste, has caused a series of land occupation and environmental pollution problems in the process of urbanization. In this paper, copper slag combined with traditional stabilizer lime was used to treat expansive soil. The engineering properties and microstructure of modified expansive soil were investigated by a series of macroscopic and microscopic tests, and the stabilization mechanism was illustrated. The evaluation of environmental effects was made in combination with the Hakanson potential ecological risk index method. Results show that copper slag can effectively reduce the swelling and compressibility of expansive soil and significantly improve its strength. Compared with the specimen without copper slag, the strength of the specimen with 6% copper slag can reach 1.2 MPa, which meets the road standard. Microscopic test results reveal the process of densification of soil structure through a series of physicochemical effects such as physical filling, cation exchange and pozzolanic reaction. Meanwhile, the interaction mechanism between lime-copper slag composite cementitious material and expansive soil is divided into the following three stages: physical filling stage, initial hydrolysis and hydration stage, and secondary hydration stage. The environmental effect evaluation results prove the environmental harmlessness of lime-copper slag in the process of stabilizing expansive soil. The study demonstrates that copper slag is highly effective as a soil stabilizer and has a broad application prospect in resource utilization.

Keywords: copper slag; expansive soil; engineering properties; microstructure; environmental effects

作者信息

吴杰，查甫生，康博

（合肥工业大学资源与环境工程学院，安徽合肥230009）

摘要和关键词

摘要: 城市化进程中,工业固体废弃物铜渣过度堆存引发了一系列土地占用及环境污染问题。文章以铜渣部分替代传统改良剂石灰来改良膨胀土,通过一系列宏观、微观试验对改良土的工程特性及微观结构进行研究,揭示铜渣改良膨胀土的作用机理,同时结合潜在生态风险指数法对改良土的环境效应进行综合评价。研究结果表明:铜渣作为改良剂可有效降低膨胀土的胀缩性及压缩性,显著改善土体强度特性;相较于未添加铜渣的试样,6%铜渣掺量下的改良膨胀土强度可达1.2 MPa,满足路用标准。微观试验结果则揭示了改良剂通过填充作用、阳离子交换、火山灰反应等一系列物理化学作用使土体结构致密化的过程。同时,将石灰-铜渣复合胶凝材料与膨胀土的相互作用划分为物理填充阶段、初次水解水化阶段、二次水化阶段。环境效应评价结果表明石灰-铜渣在改良膨胀土过程中的环境无害性。该研究证明了铜渣作为土壤稳定剂的效果十分显著,在资源化利用中具有广阔的应用前景。

关键词: 铜渣；膨胀土；工程性质；微观结构；环境效应

Funding

国家自然科学基金资助项目（42030710）

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