Mechanism of steel slag powder stabilization and improvement of expansive clay

SUN Yinlei; YU Chuan; LIAO Lei; LI Zhifei

doi:10.16030/j.cnki.issn.1000-3665.202311064

2025 Vol. 52, No. 1

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SUN Yinlei, YU Chuan, LIAO Lei, LI Zhifei. Mechanism of steel slag powder stabilization and improvement of expansive clay[J]. Hydrogeology & Engineering Geology, 2025, 52(1): 113-129. doi: 10.16030/j.cnki.issn.1000-3665.202311064

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SUN Yinlei, YU Chuan, LIAO Lei, LI Zhifei. Mechanism of steel slag powder stabilization and improvement of expansive clay[J]. Hydrogeology & Engineering Geology, 2025, 52(1): 113-129. doi: 10.16030/j.cnki.issn.1000-3665.202311064

Mechanism of steel slag powder stabilization and improvement of expansive clay

School of Architecture and Planning, Yunnan University, Kunming, Yunnan　650500, China

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Corresponding author: YU Chuan, yuchuan@stu.ynu.edu.cn

Received Date: 30 November 2023

Revised Date: 07 May 2024

Publish Date: 15 January 2025

Abstract

Abstract

Expansive clay is prone to geological disasters such as roadbed deformation, slope instability, and landslides under long-term hot and humid conditions. To address these engineering challenges and promote the high-value, resource-efficient use of steel slag, it is crucial to investigate the macroscopic and microscopic characteristics of steel slag powder (SSP)-improved expansive clay. This paper provides a comprehensive review of the current research on SSP-improved expansive clay, systematically summarizing the physicochemical properties and gelling activity of SSP. Additionally, the excitation principle of alkali exciters on the activity of SSP was described, and the micro-mechanism and mechanical properties of SSP improved expansive clay were revealed. The main conclusions are as follows: (1) SSP contains abundant active mineral components that can undergo ion exchange and hydration reaction with clay particles, thus changing the microstructure and physicochemical properties of clay. (2) The chemical composition and structural properties of SSP will be affected by the production process and the use of the environment, which in turn affects its chemical activity. By reducing the particle size of SSP, adding alkaline exciters or compound modification can improve its cementation activity and hydration rate. (3) SSP as a soil conditioner can significantly improve the performance of expansive clay, including expansion and contraction and mechanical properties. (4) The studies on the interaction mechanism between SSP and clay and the application effect of composite exciters remain insufficient and requires further investigation. (5) Future research should consider the chemical and physical properties under the coupling of different factors, including the chemical-mineral composition and the microstructure evolution law of the soil, as well as the mechanical properties of the soil under the water-chemical-force interactions. By further exploring the micro-mechanism and engineering properties of SSP-amended soils, the value of their engineering applications can be improved, providing valuable insights for the recycling of solid waste resources and environmental protection.
- steel slag powder /
- gelling activity /
- swelling-shrinkage /
- clay mineral /
- improving mechanism /
- mechanical propertie

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References

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